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git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353075 13f79535-47bb-0310-9956-ffa450edef68
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Glen Stampoultzis 2003-05-01 23:35:19 +00:00
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<?xml version="1.0" encoding="UTF-8"?>
<document>
<header>
<title>Third Party Contributions</title>
<authors>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="How to Contribute">
<p>
See <link href="contrib.xml">How to contribute to Poi</link>.
</p>
</section>
<section title="Contributed Components">
<p>
These are not necessarily deemed to be high enough quality to be included in the
core distribution, but they have been tested under <connect href="contrib.xml">
several key environments</connect>, they are provided under the same license
as Poi, and they are included in the POI distribution under the
<code>contrib/</code> directory.
</p>
<p>
<strong>None as yet!</strong> - although you can expect that some of the links
listed below will eventually migrate to the "contributed components" level, and
then maybe even into the main distribution.
</p>
</section>
<section title="Patch Queue">
<p><link href="patches.html">Submissions of modifications</link>
to Poi which are awaiting review. Anyone can
comment on them on the dev mailing list - code reviewers are needed!
<strong>Use these at your own risk</strong> - although Poi has no guarantee
either, these patches have not been reviewed, let alone accepted.
</p>
</section>
<section title="Other Extensions">
<p>The other extensions listed here are <strong>not endorsed</strong> by the Poi
project either - they are provided as a convenience only. They may or may not work,
they may or may not be open source, etc.
</p>
<p>To have a link added to this table, see <link href="contrib.xml">How to contribute
to POI</link>.</p>
<table>
<tr>
<th>Name and Link</th>
<th>Type</th>
<th>Description</th>
<th>Status</th>
<th>Licensing</th>
<th>Contact</th>
</tr>
</table>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "./dtd/book-cocoon-v10.dtd">
<book software="Poi"
title="Poi Project Documentation"
copyright="@year@ Poi Project"
xmlns:xlink="http://www.w3.org/1999/xlink">
<menu label="Community">
<menu-item label="News" href="news.html"/>
<menu-item label="Mirrors" href="mirrors.html"/>
<menu-item label="Changes" href="changes.html"/>
<menu-item label="To do" href="todo.html"/>
<menu-item label="Get Involved" href="getinvolved/index.html"/>
<menu-item label="Mailing Lists" href="http://jakarta.apache.org/site/mail.html"/>
<menu-item label="Vision" href="plan/POI20Vision.html"/>
<menu-item label="History and Future" href="historyandfuture.html"/>
<menu-item label="Who we are" href="who.html"/>
<menu-item label="Resolutions" href="resolutions/index.html"/>
</menu>
<menu label="Marketing">
<menu-item label="Case Studies" href="casestudies.html"/>
</menu>
<menu label="Project">
<menu-item label="Overview" href="overview.html"/>
<menu-item label="POIFS" href="poifs/index.html"/>
<menu-item label="HSSF" href="hssf/index.html"/>
<menu-item label="HDF" href="hdf/index.html"/>
<menu-item label="HPSF" href="hpsf/index.html"/>
<menu-item label="POI-Utils" href="utils/index.html"/>
<menu-item label="Download" href="http://jakarta.apache.org/builds/jakarta-poi/"/>
</menu>
<menu label="Docs">
<menu-item label="Javadocs" href="http://jakarta.apache.org/poi/javadocs/"/>
<menu-item label="FAQ" href="faq.html"/>
<menu-item label="References" href="references/index.html"/>
</menu>
<menu label="Translations">
<menu-item label="Index" href="trans/index.html"/>
<menu-item label="Guidelines" href="trans/guidelines.html"/>
<menu-item label="German" href="trans/de/index.html"/>
<menu-item label="Spanish" href="trans/es/index.html"/>
<menu-item label="Japanese" href="http://www.terra-intl.com/jakarta/poi/"/>
</menu>
<menu label="Code">
<menu-item label="Source Code" href="http://jakarta.apache.org/poi/javadocs/javasrc/"/>
<menu-item label="CVS" href="http://jakarta.apache.org/site/cvsindex.html"/>
<menu-item label="Top Voted Bugs" href="http://nagoya.apache.org/bugzilla/buglist.cgi?votes=1&amp;product=POI&amp;order=bugs.votes"/>
<menu-item label="Bug Database" href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI"/>
<menu-item label="Patches" href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI&amp;short_desc=%5BPATCH%5D&amp;short_desc_type=allwordssubstr"/>
<menu-item label="Junit Test Results" href="http://jakarta.apache.org/poi/tests/junit/"/>
<menu-item label="Dependency Metrics" href="http://jakarta.apache.org/poi/metrics/jdepend/"/>
<menu-item label="Checkstyle Metrics" href="http://jakarta.apache.org/poi/metrics/checkstyle/"/>
</menu>
</book>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Jakarta POI - Case Studies</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="CR" name="Cameron Riley" email="crileyNO@SPAMekmail.com"/>
</authors>
</header>
<body>
<section title="Introduction">
<p>
A number of people are using POI for a variety of purposes. As with
any new API or technology, the first question people generally ask
is not "how can I" but rather "Who else is doing what I'm about to
do?" This is understandable with the abysmal success rate in the
software business. These case statements are meant to help create
confidence and understanding.
</p>
</section>
<section title="Submitting a Case Study">
<p>
We are actively seeking case studies for this page (after all it
just started). Andy Oliver (acoliver at apache dot org) has
agreed to have a few T-Shirts printed with the POI logo (once its
chosen) for the first
few best submissions. To submit a case study, either
<link href="http://jakarta.apache.org/poi/getinvolved/index.html">
submit a patch for this page</link> (preferred) or email it to the
<link href="http://jakarta.apache.org/site/mail.html">mailing list
</link>.
</p>
</section>
<section title="Case Studies">
<section title="Bank of Lithuania">
<p>
The <link href="http://www.lbank.lt">Bank of Lithuania</link>
reports financial statistical data to Excel format using the
<link href="http://jakarta.apache.org/poi">Jakarta POI</link>
project's <link href="http://jakarta.apache.org/poi/hssf">
HSSF</link> API. The system is based on Oracle JServer and
utilizes a Java stored procedure that outputs to XLS format
using the HSSF API. - Arian Lashkov (alaskov at lbank.lt)
</p>
</section>
<section title="Bit Tracker by Tracker Inc., and ThinkVirtual">
<p>
Bit Tracker (http://www.bittracker.com) is the world's first and only web-based drill bit tracking system to manage your company's critical bit information and use that data to its full potential. It manages all bit related data, including their usage, locations, how they were used, and results such as rate of penetration and dull grade after use. This data needs to be available in Excel format for backwards compatibility and other uses in the industry. After using CSV and HTML formats, we needed something better for creating the spreadsheets and POI is the answer. It works great and was easy to implement. Kudos to the POI team.
</p>
<p>
Travis Reeder (travis at thinkvirtual dot com)
</p>
</section>
<section title="Edwards And Kelcey Technology">
<p>
Edwards and Kelcey Technology (http://www.ekcorp.com/) developed a
Facility
Managament and Maintenance System for the Telecommunications industry
based
on Turbine and Velocity. Originally the invoicing was done with a simple
CVS
sheet which was then marked up by accounts and customized for each client.
As growth has been consistent with the application, the requirement for
invoices that need not be touched by hand increased. POI provided the
solution to this issue, integrating easily and transparently into the
system. POI HSSF was used to create the invoices directly from the server
in
Excel 97 format and now services over 150 unique invoices per month.
</p>
<p>
Cameron Riley (crileyNO@ SPAMekmail.com)
</p>
</section>
<section title="ClickFind">
<p>
<link href="http://www.clickfind.com">ClickFind Inc.</link> used the POI
projects HSSF API to provide their medical
research clients with an Excel export from their electronic data
collection web service Data Collector 3.0. The POI team's assistance
allowed ClickFind to give their clients a data format that requires less
technical expertise than the XML format used by the Data Collector
application. This was important to ClickFind as many of their current
and potential clients are already using Excel in their day-to-day
operations and in established procedures for handling their generated
clinical data. - Jared Walker (jared.walker at clickfind.com)
</p>
</section>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0"?>
<!DOCTYPE changes PUBLIC "-//APACHE//DTD Changes V1.1//EN" "./dtd/changes-v11.dtd">
<changes title="History of Changes">
<devs>
<!-- in strict alphabetical order -->
<person id="AO" name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
<person id="GJS" name="Glen Stampoultzis" email="glens@apache.org"/>
<person id="MJ" name="Marc Johnson" email="mjohnson@apache.org"/>
<person id="NKB" name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person id="POI-DEVELOPERS" name="Poi Developers" email="poi-dev@jakarta.apache.org"/>
</devs>
<release version="1.10-dev" date="19 Feb 2003">
<action dev="POI-DEVELOPERS" type="add">Support for zoom level</action>
<action dev="POI-DEVELOPERS" type="add">Freeze and split pane support</action>
<action dev="POI-DEVELOPERS" type="add">Row and column headers on printouts</action>
</release>
<release version="1.8-dev" date="20 Sep 2002">
<action dev="POI-DEVELOPERS" type="add">Custom Data Format Support</action>
<action dev="POI-DEVELOPERS" type="add">Enhanced Unicode Support for Russian and Japanese</action>
<action dev="POI-DEVELOPERS" type="add">Enhanced formula support including read-only for
"optimized if" statements.</action>
<action dev="POI-DEVELOPERS" type="add">Support for cloning objects</action>
<action dev="POI-DEVELOPERS" type="add">Fixes for header/footer</action>
<action dev="POI-DEVELOPERS" type="add">Spanish Documentation translations</action>
<action dev="POI-DEVELOPERS" type="add">Support for preserving VBA macros</action>
</release>
<release version="1.7-dev" date="???">
<action dev="NKB" type="update">Removed runtime dependency on commons logging.</action>
<action dev="POI-DEVELOPERS" type="update">Formula support</action>
</release>
<release version="1.5.1" date="16 June 2002">
<action dev="GJS" type="update">Removed depedency on commons logging. Now define poi.logging system property to enable logging to standard out.</action>
<action dev="GJS" type="fix">Fixed SST string handling so that spreadsheets with rich text or extended text will be read correctly.</action>
</release>
<release version="1.5" date="06 May 2002">
<action dev="NKB" type="update">New project build.</action>
<action dev="NKB" type="update">New project documentation system based on Cocoon.</action>
<action dev="POI-DEVELOPERS" type="update">Package rename</action>
<action dev="POI-DEVELOPERS" type="fix">Various bug fixes</action>
<action dev="POI-DEVELOPERS" type="add">Early stages of HSF development (not ready for development)</action>
<action dev="POI-DEVELOPERS" type="add">Initial low level record support for charting (not complete)</action>
</release>
<release version="1.1.0" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Created new event model</action>
<action dev="POI-DEVELOPERS">Optimizations made to HSSF including aggregate records for
values, rows, etc.</action>
<action dev="POI-DEVELOPERS">predictive sizing, offset based writing (instead of lots of
array copies)</action>
<action dev="POI-DEVELOPERS">minor re-factoring and bug fixes.</action>
</release>
<release version="1.0.0" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Minor documentation updates.</action>
</release>
<release version="0.14.0" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Added DataFormat helper class and exposed set and get format
on HSSFCellStyle</action>
<action dev="POI-DEVELOPERS">Fixed column width apis (unit wise) and various javadoc on
the subject</action>
<action dev="POI-DEVELOPERS">Fix for Dimensions record (again)... (one of these days I'll
write a unit test for this ;-p).</action>
<action dev="POI-DEVELOPERS">Some optimization on sheet creation.</action>
</release>
<release version="0.13.0" date="Release date not recorded">
</release>
<release version="0.12.0" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Added MulBlank, Blank, ColInfo</action>
<action dev="POI-DEVELOPERS">Added log4j facility and removed all sys.out type logging</action>
<action dev="POI-DEVELOPERS">Added support for adding font's, styles and corresponding
high level api for styling cells</action>
<action dev="POI-DEVELOPERS">added support for changing row height, cell width and default
row height/cell width.</action>
<action dev="POI-DEVELOPERS">Added fixes for internationalization (UTF-16 should work now
from HSSFCell.setStringValue, etc when the encoding is set)</action>
<action dev="POI-DEVELOPERS">added support for adding/removing and naming sheets.</action>
</release>
<release version="0.11.0" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Bugfix release. We were throwing an exception when reading
RKRecord objects.</action>
</release>
<release version="0.10.0" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Got continuation records to work (read/write)</action>
<action dev="POI-DEVELOPERS">Added various pre-support for formulas</action>
<action dev="POI-DEVELOPERS">Massive API reorganization, repackaging.</action>
<action dev="POI-DEVELOPERS">BiffViewer class added for validating HSSF &amp; POI and/or
HSSF Output.</action>
<action dev="POI-DEVELOPERS">Better API support for modification.</action>
</release>
<release version="0.7 (and interim releases)" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Added encoding flag to high and low level api to use utf-16
when needed (HSSFCell.setEncoding())</action>
<action dev="POI-DEVELOPERS">added read only support for Label records (which are
reinterpreted as LabelSST when written)</action>
<action dev="POI-DEVELOPERS">Broken continuation record implementation (oops)</action>
<action dev="POI-DEVELOPERS">BiffViewer class added for validating HSSF &amp; POI and/or
HSSF Output.</action>
</release>
<release version="0.6 (release)" date="Release date not recorded">
<action dev="POI-DEVELOPERS">Support for read/write and modify.</action>
<action dev="POI-DEVELOPERS">Read only support for MulRK records (converted to Number when
writing)
</action>
</release>
</changes>

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<!-- (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % ISOdia PUBLIC
"ISO 8879:1986//ENTITIES Diacritical Marks//EN//XML">
%ISOdia;
-->
<!-- This version of the entity set can be used with any SGML document
which uses ISO 10646 as its document character set.
This includes XML documents and ISO HTML documents.
This entity set uses hexadecimal numeric character references.
Creator: Rick Jelliffe, Allette Systems
Version: 1997-07-07
-->
<!ENTITY acute "&#180;" ><!--=acute accent-->
<!ENTITY breve "&#x2D8;" ><!--=breve-->
<!ENTITY caron "&#x2C7;" ><!--=caron-->
<!ENTITY cedil "&#184;" ><!--=cedilla-->
<!ENTITY circ "^" ><!--=circumflex accent-->
<!ENTITY dblac "&#x2DD;" ><!--=double acute accent-->
<!ENTITY die "&#168;" ><!--=dieresis-->
<!ENTITY dot "&#x2D9;" ><!--=dot above-->
<!ENTITY grave "`" ><!--=grave accent-->
<!ENTITY macr "&#175;" ><!--=macron-->
<!ENTITY ogon "&#x2DB;" ><!--=ogonek-->
<!ENTITY ring "&#x2DA;" ><!--=ring-->
<!ENTITY tilde "&#x2DC;" ><!--=tilde-->
<!ENTITY uml "&#168;" ><!--=umlaut mark-->

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<!-- (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
Creator: version from ISO 8879:1986
Version: 0.21 1992-12-04
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % ISOGRK1 PUBLIC
"ISO 9573-15:1993//ENTITIES Greek Letters//EN//XML">
%ISOGRK1;
-->
<!-- This version of the entity set can be used with any SGML document
which uses ISO 10646 as its document character set.
This includes XML documents and ISO HTML documents.
Creator: Rick Jelliffe, from HTMLlat1
Version: 1997-07-07
-->
<!ENTITY agr "&#945;" ><!--small alpha, Greek, U03B1 -->
<!ENTITY Agr "&#913;" ><!--capital Alpha, Greek, U0391 -->
<!ENTITY bgr "&#946;" ><!--small beta, Greek, U03B2 -->
<!ENTITY Bgr "&#914;" ><!--capital Beta, Greek, U0392 -->
<!ENTITY ggr "&#947;" ><!--small gamma, Greek, U03B3 -->
<!ENTITY Ggr "&#915;" ><!--capital Gamma, Greek, U0393 -->
<!ENTITY dgr "&#948;" ><!--small delta, Greek, U03B4 -->
<!ENTITY Dgr "&#916;" ><!--capital Delta, Greek, U0394 -->
<!ENTITY egr "&#949;" ><!--small epsilon, Greek, U03B5 -->
<!ENTITY Egr "&#917;" ><!--capital Epsilon, Greek, U0395 -->
<!ENTITY zgr "&#950;" ><!--small zeta, Greek, U03B6 -->
<!ENTITY Zgr "&#918;" ><!--capital Zeta, Greek, U0396 -->
<!ENTITY eegr "&#951;" ><!--small eta, Greek, U03B7 -->
<!ENTITY EEgr "&#919;" ><!--capital Eta, Greek, U0397 -->
<!ENTITY thgr "&#952;" ><!--small theta, Greek, U03B8 -->
<!ENTITY THgr "&#920;" ><!--capital Theta, Greek, U0398 -->
<!ENTITY igr "&#953;" ><!--small iota, Greek, U03B9 -->
<!ENTITY Igr "&#921;" ><!--capital Iota, Greek, U0399 -->
<!ENTITY kgr "&#954;" ><!--small kappa, Greek, U03BA -->
<!ENTITY Kgr "&#922;" ><!--capital Kappa, Greek, U039A -->
<!ENTITY lgr "&#955;" ><!--small lambda, Greek, U03BB -->
<!ENTITY Lgr "&#923;" ><!--capital Lambda, Greek, U039B -->
<!ENTITY mgr "&#956;" ><!--small mu, Greek, U03BC -->
<!ENTITY Mgr "&#924;" ><!--capital Mu, Greek, U039C -->
<!ENTITY ngr "&#957;" ><!--small nu, Greek, U03BD -->
<!ENTITY Ngr "&#925;" ><!--capital Nu, Greek, U039D -->
<!ENTITY xgr "&#958;" ><!--small xi, Greek, U03BE -->
<!ENTITY Xgr "&#926;" ><!--capital Xi, Greek, U039E -->
<!ENTITY ogr "&#959;" ><!--small omicron, Greek, U03BF -->
<!ENTITY Ogr "&#927;" ><!--capital Omicron, Greek, U039F -->
<!ENTITY pgr "&#960;" ><!--small pi, Greek, U03C0 -->
<!ENTITY Pgr "&#928;" ><!--capital Pi, Greek, U03A0 -->
<!ENTITY rgr "&#961;" ><!--small rho, Greek, U03C1 -->
<!ENTITY Rgr "&#929;" ><!--capital Rho, Greek, U03A1 -->
<!ENTITY sfgr "&#962;" ><!--final small sigma, Greek, U03C2 -->
<!ENTITY sgr "&#963;" ><!--small sigma, Greek, U03C3 -->
<!ENTITY Sgr "&#931;" ><!--capital Sigma, Greek, U03A3 -->
<!ENTITY tgr "&#964;" ><!--small tau, Greek, U03C4 -->
<!ENTITY Tgr "&#932;" ><!--capital Tau, Greek, U03A4 -->
<!ENTITY ugr "&#965;" ><!--small upsilon, Greek, U03C5 -->
<!ENTITY Ugr "&#933;" ><!--capital Upsilon, Greek, U03A5 -->
<!ENTITY phgr "&#966;" ><!--small phi, Greek, U03C6 -->
<!ENTITY PHgr "&#934;" ><!--capital Phi, Greek, U03A6 -->
<!ENTITY khgr "&#967;" ><!--small chi, Greek, U03C7 -->
<!ENTITY KHgr "&#935;" ><!--capital Chi, Greek, U03A7 -->
<!ENTITY psgr "&#968;" ><!--small psi, Greek, U03C8 -->
<!ENTITY PSgr "&#936;" ><!--capital Psi, Greek, U03A8 -->
<!ENTITY ohgr "&#969;" ><!--small omega, Greek, U03C9 -->
<!ENTITY OHgr "&#937;" ><!--capital Omega, Greek, U03A9 -->

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<!-- (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % ISOlat1 PUBLIC
"ISO 8879-1986//ENTITIES Added Latin 1//EN//XML">
%ISOlat1;
-->
<!-- This version of the entity set can be used with any SGML document
which uses ISO 8859-1 or ISO 10646 as its document character
set. This includes XML documents and ISO HTML documents.
-->
<!ENTITY Agrave "&#192;" ><!-- capital A, grave accent -->
<!ENTITY Aacute "&#193;" ><!-- capital A, acute accent -->
<!ENTITY Acirc "&#194;" ><!-- capital A, circumflex accent -->
<!ENTITY Atilde "&#195;" ><!-- capital A, tilde -->
<!ENTITY Auml "&#196;" ><!-- capital A, dieresis or umlaut mark -->
<!ENTITY Aring "&#197;" ><!-- capital A, ring -->
<!ENTITY AElig "&#198;" ><!-- capital AE diphthong (ligature) -->
<!ENTITY Ccedil "&#199;" ><!-- capital C, cedilla -->
<!ENTITY Egrave "&#200;" ><!-- capital E, grave accent -->
<!ENTITY Eacute "&#201;" ><!-- capital E, acute accent -->
<!ENTITY Ecirc "&#202;" ><!-- capital E, circumflex accent -->
<!ENTITY Euml "&#203;" ><!-- capital E, dieresis or umlaut mark -->
<!ENTITY Igrave "&#204;" ><!-- capital I, grave accent -->
<!ENTITY Iacute "&#205;" ><!-- capital I, acute accent -->
<!ENTITY Icirc "&#206;" ><!-- capital I, circumflex accent -->
<!ENTITY Iuml "&#207;" ><!-- capital I, dieresis or umlaut mark -->
<!ENTITY ETH "&#208;" ><!-- capital Eth, Icelandic -->
<!ENTITY Ntilde "&#209;" ><!-- capital N, tilde -->
<!ENTITY Ograve "&#210;" ><!-- capital O, grave accent -->
<!ENTITY Oacute "&#211;" ><!-- capital O, acute accent -->
<!ENTITY Ocirc "&#212;" ><!-- capital O, circumflex accent -->
<!ENTITY Otilde "&#213;" ><!-- capital O, tilde -->
<!ENTITY Ouml "&#214;" ><!-- capital O, dieresis or umlaut mark -->
<!ENTITY Oslash "&#216;" ><!-- capital O, slash -->
<!ENTITY Ugrave "&#217;" ><!-- capital U, grave accent -->
<!ENTITY Uacute "&#218;" ><!-- capital U, acute accent -->
<!ENTITY Ucirc "&#219;" ><!-- capital U, circumflex accent -->
<!ENTITY Uuml "&#220;" ><!-- capital U, dieresis or umlaut mark -->
<!ENTITY Yacute "&#221;" ><!-- capital Y, acute accent -->
<!ENTITY THORN "&#222;" ><!-- capital THORN, Icelandic -->
<!ENTITY szlig "&#223;" ><!-- small sharp s, German (sz ligature) -->
<!ENTITY agrave "&#224;" ><!-- small a, grave accent -->
<!ENTITY aacute "&#225;" ><!-- small a, acute accent -->
<!ENTITY acirc "&#226;" ><!-- small a, circumflex accent -->
<!ENTITY atilde "&#227;" ><!-- small a, tilde -->
<!ENTITY auml "&#228;" ><!-- small a, dieresis or umlaut mark -->
<!ENTITY aring "&#229;" ><!-- small a, ring -->
<!ENTITY aelig "&#230;" ><!-- small ae diphthong (ligature) -->
<!ENTITY ccedil "&#231;" ><!-- small c, cedilla -->
<!ENTITY egrave "&#232;" ><!-- small e, grave accent -->
<!ENTITY eacute "&#233;" ><!-- small e, acute accent -->
<!ENTITY ecirc "&#234;" ><!-- small e, circumflex accent -->
<!ENTITY euml "&#235;" ><!-- small e, dieresis or umlaut mark -->
<!ENTITY igrave "&#236;" ><!-- small i, grave accent -->
<!ENTITY iacute "&#237;" ><!-- small i, acute accent -->
<!ENTITY icirc "&#238;" ><!-- small i, circumflex accent -->
<!ENTITY iuml "&#239;" ><!-- small i, dieresis or umlaut mark -->
<!ENTITY eth "&#240;" ><!-- small eth, Icelandic -->
<!ENTITY ntilde "&#241;" ><!-- small n, tilde -->
<!ENTITY ograve "&#242;" ><!-- small o, grave accent -->
<!ENTITY oacute "&#243;" ><!-- small o, acute accent -->
<!ENTITY ocirc "&#244;" ><!-- small o, circumflex accent -->
<!ENTITY otilde "&#245;" ><!-- small o, tilde -->
<!ENTITY ouml "&#246;" ><!-- small o, dieresis or umlaut mark -->
<!ENTITY oslash "&#248;" ><!-- small o, slash -->
<!ENTITY ugrave "&#249;" ><!-- small u, grave accent -->
<!ENTITY uacute "&#250;" ><!-- small u, acute accent -->
<!ENTITY ucirc "&#251;" ><!-- small u, circumflex accent -->
<!ENTITY uuml "&#252;" ><!-- small u, dieresis or umlaut mark -->
<!ENTITY yacute "&#253;" ><!-- small y, acute accent -->
<!ENTITY thorn "&#254;" ><!-- small thorn, Icelandic -->
<!ENTITY yuml "&#255;" ><!-- small y, dieresis or umlaut mark -->

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<!-- (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % ISOnum PUBLIC
"ISO 8879:1986//ENTITIES Numeric and Special Graphic//EN//XML">
%ISOnum;
-->
<!-- This version of the entity set can be used with any SGML document
which uses ISO 10646 as its document character set.
This includes XML documents and ISO HTML documents.
This entity set uses hexadecimal numeric character references.
Creator: Rick Jelliffe, Allette Systems
Version: 1997-07-07
-->
<!ENTITY half "&#189;" ><!--=fraction one-half-->
<!ENTITY frac12 "&#189;" ><!--=fraction one-half-->
<!ENTITY frac14 "&#188;" ><!--=fraction one-quarter-->
<!ENTITY frac34 "&#190;" ><!--=fraction three-quarters-->
<!ENTITY frac18 "&#x215B;" >
<!-- or "&#xB1;&#x202;&#x2044;&#x2088;" --><!--=fraction one-eighth-->
<!ENTITY frac38 "&#x215C;" >
<!-- or "&#xB3;&#x2044;&#x2088;" --><!--=fraction three-eighths-->
<!ENTITY frac58 "&#x215D;" >
<!-- or "&#x2075;&#x2044;&#x2088;" --><!--=fraction five-eighths-->
<!ENTITY frac78 "&#x215E;" >
<!-- or "&#x2077;&#x2044;&#x2088;" --><!--=fraction seven-eighths-->
<!ENTITY sup1 "&#185;" ><!--=superscript one-->
<!ENTITY sup2 "&#178;" ><!--=superscript two-->
<!ENTITY sup3 "&#179;" ><!--=superscript three-->
<!ENTITY plus "+" ><!--=plus sign B:-->
<!ENTITY plusmn "&#xB1;" ><!--/pm B: =plus-or-minus sign-->
<!ENTITY lt "&#38;#60;" ><!--=less-than sign R:-->
<!ENTITY equals "=" ><!--=equals sign R:-->
<!ENTITY gt ">" ><!--=greater-than sign R:-->
<!ENTITY divide "&#247;" ><!--/div B: =divide sign-->
<!ENTITY times "&#215;" ><!--/times B: =multiply sign-->
<!ENTITY curren "&#164;" ><!--=general currency sign-->
<!ENTITY pound "&#163;" ><!--=pound sign-->
<!ENTITY dollar "$" ><!--=dollar sign-->
<!ENTITY cent "&#162;" ><!--=cent sign-->
<!ENTITY yen "&#165;" ><!--/yen =yen sign-->
<!ENTITY num "#" ><!--=number sign-->
<!ENTITY percnt "&#37;" ><!--=percent sign-->
<!ENTITY amp "&#38;#38;" ><!--=ampersand-->
<!ENTITY ast "*" ><!--/ast B: =asterisk-->
<!ENTITY commat "@" ><!--=commercial at-->
<!ENTITY lsqb "[" ><!--/lbrack O: =left square bracket-->
<!ENTITY bsol "\" ><!--/backslash =reverse solidus-->
<!ENTITY rsqb "]" ><!--/rbrack C: =right square bracket-->
<!ENTITY lcub "{" ><!--/lbrace O: =left curly bracket-->
<!ENTITY horbar "&#x2015;" ><!--=horizontal bar-->
<!ENTITY verbar "|" ><!--/vert =vertical bar-->
<!ENTITY rcub "}" ><!--/rbrace C: =right curly bracket-->
<!ENTITY micro "&#181;" ><!--=micro sign-->
<!ENTITY ohm "&#2126;" ><!--=ohm sign-->
<!ENTITY deg "&#176;" ><!--=degree sign-->
<!ENTITY ordm "&#186;" ><!--=ordinal indicator, masculine-->
<!ENTITY ordf "&#170;" ><!--=ordinal indicator, feminine-->
<!ENTITY sect "&#167;" ><!--=section sign-->
<!ENTITY para "&#182;" ><!--=pilcrow (paragraph sign)-->
<!ENTITY middot "&#183;" ><!--/centerdot B: =middle dot-->
<!ENTITY larr "&#x2190;" ><!--/leftarrow /gets A: =leftward arrow-->
<!ENTITY rarr "&#x2192;" ><!--/rightarrow /to A: =rightward arrow-->
<!ENTITY uarr "&#x2191;" ><!--/uparrow A: =upward arrow-->
<!ENTITY darr "&#x2193;" ><!--/downarrow A: =downward arrow-->
<!ENTITY copy "&#169;" ><!--=copyright sign-->
<!ENTITY reg "&#174;" ><!--/circledR =registered sign-->
<!ENTITY trade "&#8482;" ><!--=trade mark sign-->
<!ENTITY brvbar "&#xA6;" ><!--=bren (vertical) bar-->
<!ENTITY not "&#xAC;" ><!--/neg /lnot =not sign-->
<!ENTITY sung "&#x266A;" ><!--=music note (sung text sign)-->
<!ENTITY excl "!" ><!--=exclamation mark-->
<!ENTITY iexcl "&#xA1;" ><!--=inverted exclamation mark-->
<!ENTITY quot '"' ><!--=quotation mark-->
<!ENTITY apos "'" ><!--=apostrophe-->
<!ENTITY lpar "(" ><!--O: =left parenthesis-->
<!ENTITY rpar ")" ><!--C: =right parenthesis-->
<!ENTITY comma "," ><!--P: =comma-->
<!ENTITY lowbar "_" ><!--=low line-->
<!ENTITY hyphen "&#x2010;" ><!--=hyphen-->
<!ENTITY period "." ><!--=full stop, period-->
<!ENTITY sol "/" ><!--=solidus-->
<!ENTITY colon ":" ><!--/colon P:-->
<!ENTITY semi ";" ><!--=semicolon P:-->
<!ENTITY quest "?" ><!--=question mark-->
<!ENTITY iquest "&#xBF;" ><!--=inverted question mark-->
<!ENTITY laquo "&#x2039;" ><!--=angle quotation mark, left
But note that Unicode 1 & Maler & el Andaloussi give &#xAB; -->
<!ENTITY raquo "&#x203A;" ><!--=angle quotation mark, right
But note that Unicode 1 & Maler & el Andaloussi give &#xBB; -->
<!ENTITY lsquo "&#x2018;" ><!--=single quotation mark, left-->
<!ENTITY rsquo "&#x2019;" ><!--=single quotation mark, right-->
<!ENTITY ldquo "&#x201C;" ><!--=double quotation mark, left-->
<!ENTITY rdquo "&#x201D;" ><!--=double quotation mark, right-->
<!ENTITY nbsp "&#160;" ><!--=no break (required) space-->
<!ENTITY shy "&#173;" ><!--=soft hyphen-->

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<!-- (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % ISOpub PUBLIC
"ISO 8879:1986//ENTITIES Publishing//EN//XML">
%ISOpub;
-->
<!-- This version of the entity set can be used with any SGML document
which uses ISO 10646 as its document character set.
This includes XML documents and ISO HTML documents.
This entity set uses hexadecimal numeric character references.
Creator: Rick Jelliffe, Allette Systems
Version: 1997-07-07
-->
<!ENTITY emsp "&#x2003;" ><!--=em space-->
<!ENTITY ensp "&#x2002;" ><!--=en space (1/2-em)-->
<!ENTITY emsp13 "&#x2004;" ><!--=1/3-em space-->
<!ENTITY emsp14 "&#x2005;" ><!--=1/4-em space-->
<!ENTITY numsp "&#x2007;" ><!--=digit space (width of a number)-->
<!ENTITY puncsp "&#x2008;" ><!--=punctuation space (width of comma)-->
<!ENTITY thinsp "&#x2009;" ><!--=thin space (1/6-em)-->
<!ENTITY hairsp "&#x200A;" ><!--=hair space-->
<!ENTITY mdash "&#x2014;" ><!--=em dash-->
<!ENTITY ndash "&#x2013;" ><!--=en dash-->
<!ENTITY dash "&#x2010;" ><!--=hyphen (true graphic)-->
<!ENTITY blank "&#x2423;" ><!--=significant blank symbol-->
<!ENTITY hellip "&#x2026;" ><!--=ellipsis (horizontal)-->
<!ENTITY nldr "&#x2025;" ><!--=double baseline dot (en leader)-->
<!ENTITY frac13 "&#x2153;" ><!--=fraction one-third-->
<!ENTITY frac23 "&#x2154;" ><!--=fraction two-thirds-->
<!ENTITY frac15 "&#x2155;" ><!--=fraction one-fifth-->
<!ENTITY frac25 "&#x2156;" ><!--=fraction two-fifths-->
<!ENTITY frac35 "&#x2157;" ><!--=fraction three-fifths-->
<!ENTITY frac45 "&#x2158;" ><!--=fraction four-fifths-->
<!ENTITY frac16 "&#x2159;" ><!--=fraction one-sixth-->
<!ENTITY frac56 "&#x215a;" ><!--=fraction five-sixths-->
<!ENTITY incare "&#x2105;" ><!--=in-care-of symbol-->
<!ENTITY block "&#x2588;" ><!--=full block-->
<!ENTITY uhblk "&#x2580;" ><!--=upper half block-->
<!ENTITY lhblk "&#x2584;" ><!--=lower half block-->
<!ENTITY blk14 "&#x2591;" ><!--=25% shaded block-->
<!ENTITY blk12 "&#x2592;" ><!--=50% shaded block-->
<!ENTITY blk34 "&#x2593;" ><!--=75% shaded block-->
<!ENTITY marker "&#x25AE;" ><!--=histogram marker-->
<!ENTITY cir "&#x25CB;" ><!--/circ B: =circle, open-->
<!ENTITY squ "&#x25A1;" ><!--=square, open-->
<!ENTITY rect "&#x25AD;" ><!--=rectangle, open-->
<!ENTITY utri "&#x25B5;" ><!--/triangle =up triangle, open-->
<!ENTITY dtri "&#x25BF;" ><!--/triangledown =down triangle, open-->
<!ENTITY star "&#x2606;" ><!--=star, open-->
<!ENTITY bull "&#x2022;" ><!--/bullet B: =round bullet, filled-->
<!ENTITY squf "&#x25AA;" ><!--/blacksquare =sq bullet, filled-->
<!ENTITY utrif "&#x25B4;" ><!--/blacktriangle =up tri, filled-->
<!ENTITY dtrif "&#x25BE;" ><!--/blacktriangledown =dn tri, filled-->
<!ENTITY ltrif "&#x25C2;" ><!--/blacktriangleleft R: =l tri, filled-->
<!ENTITY rtrif "&#x25B8;" ><!--/blacktriangleright R: =r tri, filled-->
<!ENTITY clubs "&#x2663;" ><!--/clubsuit =club suit symbol-->
<!ENTITY diams "&#x2662;" ><!--/diamondsuit =diamond suit symbol-->
<!ENTITY hearts "&#x2661;" ><!--/heartsuit =heart suit symbol-->
<!ENTITY spades "&#x2660;" ><!--/spadesuit =spades suit symbol-->
<!ENTITY malt "&#x2720;" ><!--/maltese =maltese cross-->
<!ENTITY dagger "&#x2020;" ><!--/dagger B: =dagger-->
<!ENTITY Dagger "&#x2021;" ><!--/ddagger B: =double dagger-->
<!ENTITY check "&#x2713;" ><!--/checkmark =tick, check mark-->
<!ENTITY cross "&#x2717;" ><!--=ballot cross-->
<!ENTITY sharp "&#x266F;" ><!--/sharp =musical sharp-->
<!ENTITY flat "&#x266D;" ><!--/flat =musical flat-->
<!ENTITY male "&#x2642;" ><!--=male symbol-->
<!ENTITY female "&#x2640;" ><!--=female symbol-->
<!ENTITY phone "&#x26E0;" ><!--=telephone symbol-->
<!ENTITY telrec "&#x2315;" ><!--=telephone recorder symbol-->
<!ENTITY copysr "&#x2117;" ><!--=sound recording copyright sign-->
<!ENTITY caret "&#x2041;" ><!--=caret (insertion mark)-->
<!ENTITY lsquor "&#x201A;" ><!--=rising single quote, left (low)-->
<!ENTITY ldquor "&#x201E;" ><!--=rising dbl quote, left (low)-->
<!ENTITY fflig "&#xFB00;" ><!--small ff ligature-->
<!ENTITY filig "&#xFB01;" ><!--small fi ligature-->
<!ENTITY fjlig "fj" ><!--small fj ligature-->
<!ENTITY ffilig "&#xFB03;" ><!--small ffi ligature-->
<!ENTITY ffllig "&#xFB04;" ><!--small ffl ligature-->
<!ENTITY fllig "&#xFB02;" ><!--small fl ligature-->
<!ENTITY mldr "&#x2025;" ><!--em leader-->
<!ENTITY rdquor "&#x201D;" ><!--rising dbl quote, right (high)-->
<!ENTITY rsquor "&#x2019;" ><!--rising single quote, right (high)-->
<!ENTITY vellip "&#x22EE;" ><!--vertical ellipsis-->
<!ENTITY hybull "&#x2043;" ><!--rectangle, filled (hyphen bullet)-->
<!ENTITY loz "&#x2727;" ><!--/lozenge - lozenge or total mark-->
<!ENTITY lozf "&#x2726;" ><!--/blacklozenge - lozenge, filled-->
<!ENTITY ltri "&#x25C3;" ><!--/triangleleft B: l triangle, open-->
<!ENTITY rtri "&#x25B9;" ><!--/triangleright B: r triangle, open-->
<!ENTITY starf "&#x2605;" ><!--/bigstar - star, filled-->
<!ENTITY natur "&#x266E;" ><!--/natural - music natural-->
<!ENTITY rx "&#x211E;" ><!--pharmaceutical prescription (Rx)-->
<!ENTITY sext "&#x2736;" ><!--sextile (6-pointed star)-->
<!ENTITY target "&#x2316;" ><!--register mark or target-->
<!ENTITY dlcrop "&#x230D;" ><!--downward left crop mark -->
<!ENTITY drcrop "&#x230C;" ><!--downward right crop mark -->
<!ENTITY ulcrop "&#x230F;" ><!--upward left crop mark -->
<!ENTITY urcrop "&#x230E;" ><!--upward right crop mark -->

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<!-- (C) International Organization for Standardization 1986
Permission to copy in any form is granted for use with
conforming SGML systems and applications as defined in
ISO 8879, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
<!ENTITY % ISOtech PUBLIC
"ISO 8879:1986//ENTITIES General Technical//EN//XML"
"ISOtech.pen">
%ISOtech;
-->
<!-- This version of the entity set can be used with any SGML document
which uses ISO 10646 as its document character set.
This includes XML documents and ISO HTML documents.
This entity set uses hexadecimal numeric character references.
Creator: Rick Jelliffe, Allette Systems
Version: 1997-07-07
-->
<!ENTITY aleph "&#x2135;" ><!--/aleph =aleph, Hebrew-->
<!ENTITY and "&#x2227;" ><!--/wedge /land B: =logical and-->
<!ENTITY ang90 "&#x221F;" ><!--=right (90 degree) angle-->
<!ENTITY angsph "&#x2222;" ><!--/sphericalangle =angle-spherical-->
<!ENTITY ap "&#x2249;" ><!--/approx R: =approximate-->
<!ENTITY becaus "&#x2235;" ><!--/because R: =because-->
<!ENTITY bottom "&#x22A5;" ><!--/bot B: =perpendicular-->
<!ENTITY cap "&#x2229;" ><!--/cap B: =intersection-->
<!ENTITY cong "&#x2245;" ><!--/cong R: =congruent with-->
<!ENTITY conint "&#x222E;" ><!--/oint L: =contour integral operator-->
<!ENTITY cup "&#x222A;" ><!--/cup B: =union or logical sum-->
<!ENTITY equiv "&#x2261;" ><!--/equiv R: =identical with-->
<!ENTITY exist "&#x2203;" ><!--/exists =at least one exists-->
<!ENTITY forall "&#x2200;" ><!--/forall =for all-->
<!ENTITY fnof "&#x192;" ><!--=function of (italic small f)-->
<!ENTITY ge "&#x2265;" ><!--/geq /ge R: =greater-than-or-equal-->
<!ENTITY iff "&#x21D4;" ><!--/iff =if and only if-->
<!ENTITY infin "&#x221E;" ><!--/infty =infinity-->
<!ENTITY int "&#x222B;" ><!--/int L: =integral operator-->
<!ENTITY isin "&#x2208;" ><!--/in R: =set membership-->
<!ENTITY lang "&#x2329;" ><!--/langle O: =left angle bracket-->
<!ENTITY lArr "&#x21D0;" ><!--/Leftarrow A: =is implied by-->
<!ENTITY le "&#x2264;" ><!--/leq /le R: =less-than-or-equal-->
<!ENTITY minus "-" ><!--B: =minus sign-->
<!ENTITY mnplus "&#x2213;" ><!--/mp B: =minus-or-plus sign-->
<!ENTITY nabla "&#x2207;" ><!--/nabla =del, Hamilton operator-->
<!ENTITY ne "&#x2260;" ><!--/ne /neq R: =not equal-->
<!ENTITY ni "&#x220B;" ><!--/ni /owns R: =contains-->
<!ENTITY or "&#x2228;" ><!--/vee /lor B: =logical or-->
<!ENTITY par "&#x2225;" ><!--/parallel R: =parallel-->
<!ENTITY part "&#x2202;" ><!--/partial =partial differential-->
<!ENTITY permil "&#x2030;" ><!--=per thousand-->
<!ENTITY perp "&#x22A5;" ><!--/perp R: =perpendicular-->
<!ENTITY prime "&#x2032;" ><!--/prime =prime or minute-->
<!ENTITY Prime "&#x2033;" ><!--=double prime or second-->
<!ENTITY prop "&#x221D;" ><!--/propto R: =is proportional to-->
<!ENTITY radic "&#x221A;" ><!--/surd =radical-->
<!ENTITY rang "&#x232A;" ><!--/rangle C: =right angle bracket-->
<!ENTITY rArr "&#x21D2;" ><!--/Rightarrow A: =implies-->
<!ENTITY sim "&#x223C;" ><!--/sim R: =similar-->
<!ENTITY sime "&#x2243;" ><!--/simeq R: =similar, equals-->
<!ENTITY square "&#x25A1;" ><!--/square B: =square-->
<!ENTITY sub "&#x2282;" ><!--/subset R: =subset or is implied by-->
<!ENTITY sube "&#x2286;" ><!--/subseteq R: =subset, equals-->
<!ENTITY sup "&#x2283;" ><!--/supset R: =superset or implies-->
<!ENTITY supe "&#x2287;" ><!--/supseteq R: =superset, equals-->
<!ENTITY there4 "&#x2234;" ><!--/therefore R: =therefore-->
<!ENTITY Verbar "&#x2016;" ><!--/Vert =dbl vertical bar-->
<!ENTITY angst "&#x212B;" ><!--Angstrom =capital A, ring-->
<!ENTITY bernou "&#x212C;" ><!--Bernoulli function (script capital B)-->
<!ENTITY compfn "&#x2218;" ><!--B: composite function (small circle)-->
<!ENTITY Dot "&#xA8;" ><!--=dieresis or umlaut mark-->
<!ENTITY DotDot "&#x20DC;" ><!--four dots above-->
<!ENTITY hamilt "&#x210B;" ><!--Hamiltonian (script capital H)-->
<!ENTITY lagran "&#x2112;" ><!--Lagrangian (script capital L)-->
<!ENTITY lowast "&#x2217;" ><!--low asterisk-->
<!ENTITY notin "&#x2209;" ><!--N: negated set membership-->
<!ENTITY order "&#x2134;" ><!--order of (script small o)-->
<!ENTITY phmmat "&#x2133;" ><!--physics M-matrix (script capital M)-->
<!ENTITY tdot "&#x20DB;" ><!--three dots above-->
<!ENTITY tprime "&#x2034;" ><!--triple prime-->
<!ENTITY wedgeq "&#x2259;" ><!--R: corresponds to (wedge, equals)-->

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE faqs PUBLIC "-//APACHE//DTD FAQ V1.1//EN" "./dtd/faq-v11.dtd">
<faqs title="Frequently Asked Questions">
<faq>
<question>
Why is reading a simple sheet taking so long?
</question>
<answer>
You've probably enabled logging. Logging is intended only for
autopsie style debugging. Having it enabled will reduce performance
by a factor of at least 100. Logging is helpful for understanding
why POI can't read some file or developing POI itself. Important
errors are thrown as exceptions, which means you probably don't need
logging.
</answer>
</faq>
<faq>
<question>
What is the HSSF "eventmodel"?
</question>
<answer>
The HSSF eventmodel package is a new API for reading XLS files more efficiently. It does
require more knowledge on the part of the user, but reduces memory consumption by more than
tenfold. It is based on the AWT event model in combination with SAX. If you need read-only
access to a given XLS file, this is the best way to do it.
</answer>
</faq>
<faq>
<question>
Why can't read the document I created using Star Office 5.1?
</question>
<answer>
Star Office 5.1 writes some records using the older BIFF standard. This causes some problems
with POI which supports only BIFF8.
</answer>
</faq>
<faq>
<question>
Why am I getting an exception each time I attempt to read my spreadsheet?
</question>
<answer>
It's possible your spreadsheet contains a feature that is not currently supported by HSSF.
For example - spreadsheets containing cells with rich text are not currently supported.
</answer>
</faq>
<faq>
<question>
Does HSSF support protected spreadsheets?
</question>
<answer>
Protecting a spreadsheet encrypts it. We wont touch encryption because we're not legally educated
and don't understand the full implications of trying to implement this. If you wish to have a go
at this feel free to add it as a plugin module. We wont be hosting it here however.
</answer>
</faq>
<faq>
<question>
How do you tell if a field contains a date with HSSF?
</question>
<answer>
Excel stores dates as numbers therefore the only way to determine if a cell is
actually stored as a date is to look at the formatting. There is a helper method
in HSSFDateUtil (since the 1.7.0-dev release) that checks for this.
Thanks to Jason Hoffman for providing the solution.
<source>
case HSSFCell.CELL_TYPE_NUMERIC:
double d = cell.getNumericCellValue();
// test if a date!
if (HSSFDateUtil.isCellDateFormatted(cell)) {
// format in form of M/D/YY
cal.setTime(HSSFDateUtil.getJavaDate(d));
cellText =
(String.valueOf(cal.get(Calendar.YEAR))).substring(2);
cellText = cal.get(Calendar.MONTH)+1 + "/" +
cal.get(Calendar.DAY_OF_MONTH) + "/" +
cellText;
} </source>
</answer>
</faq>
<faq>
<question>
I'm trying to stream an XLS file from a servlet and I'm having some trouble. What's the problem?
</question>
<answer>
<p>
The problem usually manifests itself as the junk characters being shown on
screen. The problem persists even though you have set the correct mime type.
</p>
<p>
The short answer is, don't depend on IE to display a binary file type properly if you stream it via a
servlet. Every minor version of IE has different bugs on this issue.
</p>
<p>
The problem in most versions of IE is that it does not use the mime type on
the HTTP response to determine the file type; rather it uses the file extension
on the request. Thus you might want to add a
<strong>.xls</strong> to your request
string. For example
<em>http://yourserver.com/myServelet.xls?param1=xx</em>. This is
easily accomplished through URL mapping in any servlet container. Sometimes
a request like
<em>http://yourserver.com/myServelet?param1=xx&amp;dummy=file.xls</em> is also
known to work.
</p>
<p>
To guarantee opening the file properly in Excel from IE, write out your file to a
temporary file under your web root from your servelet. Then send an http response
to the browser to do a client side redirection to your temp file. (Note that using a
server side redirect using RequestDispatcher will not be effective in this case)
</p>
<p>
Note also that when you request a document that is opened with an
external handler, IE sometimes makes two requests to the webserver. So if your
generating process is heavy, it makes sense to write out to a temporary file, so that multiple
requests happen for a static file.
</p>
<p>
None of this is particular to Excel. The same problem arises when you try to
generate any binary file dynamically to an IE client. For example, if you generate
pdf files using
<link href="http://xml.apache.org/fop">FOP</link>, you will come across many of the same issues.
</p>
<!-- Thanks to Avik for the answer -->
</answer>
</faq>
<faq>
<question>
I want to set a cell format (Data format of a cell) of a excel sheet as ###,###,###.#### or ###,###,###.0000. Is it possible using POI ?
</question>
<answer>
<p>
Yes. You first need to get a HSSFDataFormat object from the workbook and call getFormat with the desired format. Some examples are <link href="hssf/quick-guide.html#DataFormats">here</link>.
</p>
</answer>
</faq>
<faq>
<question>
I want to set a cell format (Data format of a cell) of a excel sheet as text. Is it possible using POI ?
</question>
<answer>
<p>
Yes. This is a built-in format for excel that you can get from HSSFDataFormat object using the format string "@". Also, the string "text" will alias this format.
</p>
</answer>
</faq>
<faq>
<question>
How do I add a border around a merged cell?
</question>
<answer>
Add blank cells around where the cells normally would have been and set the borders individually for each cell.
We will probably enhance HSSF in the future to make this process easier.
</answer>
</faq>
<faq>
<question>
I tried to set cell values and Excel sheet name on my native language,
but I failed to do it. :(
</question>
<answer>
By default HSSF uses cell values and sheet names as compressed unicode,
so to support localization you should use Unicode.
To do it you should set it manually:
<source>
// for sheet name
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
wb.setSheetName( 0, "SomeUnicodeName", HSSFWorkbook.ENCODING_UTF_16 );
// for cell value
HSSFRow r = s.createRow( 0 );
HSSFCell c = r.createCell( (short)0 );
c.setCellType( HSSFCell.CELL_TYPE_STRING );
c.setEncoding( HSSFCell.ENCODING_UTF_16 );
c.setCellValue( "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F" ); </source>
Make sure you make the call to setEncoding() before calling setCellValue(), otherwise what you pass in won't be interpreted properly.
</answer>
</faq>
<faq>
<question>
I'm having trouble creating a spreadsheet using POI using
websphere 3.5.
</question>
<answer>
Make sure you have fix pack 4 installed.
</answer>
</faq>
<faq>
<question> I am using styles when creating a workbook in POI, but Excel refuses to open the file, complaining about "Too Many Styles".
</question>
<answer>
<p>You just create the styles OUTSIDE of the loop in which you create cells.</p>
<p>GOOD:</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = null;
// Aqua background
HSSFCellStyle style = wb.createCellStyle();
style.setFillBackgroundColor(HSSFColor.AQUA.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("X");
cell.setCellStyle(style);
// Orange "foreground", foreground being the fill foreground not the font color.
style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.ORANGE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
for (int x = 0; x &lt; 1000; x++) {
// Create a row and put some cells in it. Rows are 0 based.
row = sheet.createRow((short) k);
for (int y = 0; y &lt; 100; y++) {
cell = row.createCell((short) k);
cell.setCellValue("X");
cell.setCellStyle(style);
}
}
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close(); </source>
<p>BAD:</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = null;
for (int x = 0; x &lt; 1000; x++) {
// Aqua background
HSSFCellStyle style = wb.createCellStyle();
style.setFillBackgroundColor(HSSFColor.AQUA.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("X");
cell.setCellStyle(style);
// Orange "foreground", foreground being the fill foreground not the font color.
style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.ORANGE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
// Create a row and put some cells in it. Rows are 0 based.
row = sheet.createRow((short) k);
for (int y = 0; y &lt; 100; y++) {
cell = row.createCell((short) k);
cell.setCellValue("X");
cell.setCellStyle(style);
}
}
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close(); </source>
</answer>
<faq>
<question>
Will Poi read any spreadsheet and rewrite it with modifications.
</question>
<answer>
Poi is not guanteed to read the contents of any spreadsheet.
Certain features may cause spreadsheets to fail to read. More
problematic is rewriting spreadsheets. Poi tried hard to
preserve the records of the original spreadsheet but some
features may cause problems. We advise that you limit the
formatting of spreadsheets you process so as to not be
unpleasantly suprised at a later stage.
</answer>
</faq>
</faq>
</faqs>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "./dtd/book-cocoon-v10.dtd">
<book software="Poi"
title="Poi Project Documentation"
copyright="@year@ Poi Project"
xmlns:xlink="http://www.w3.org/1999/xlink">
<menu label="Get Involved">
<menu-item label="Contributing" href="index.html"/>
<menu-item label="Branching" href="branching.html"/>
<menu-item label="Mail Lists" href="http://jakarta.apache.org/site/mail.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Branching</title>
<authors>
<person id="GJS" name="Glen Stampoultzis" email="glens@apache.org"/>
</authors>
</header>
<body>
<section title="Branching Conventions">
<p>
Branches are tagged in the following way:
</p>
<ul>
<li>REL_1_5_BRANCH</li>
<li>REL_2_0_BRANCH</li>
</ul>
<p>
Merge points should be tagged as follows:
</p>
<ul>
<li>REL_1_5_BRANCH_MERGE1</li>
<li>REL_1_5_BRANCH_MERGE2</li>
<li>etc...</li>
</ul>
<p>
Releases should be tagged as:
</p>
<ul>
<li>REL_1_5</li>
<li>REL_1_5_1</li>
<li>REL_1_5_2</li>
<li>etc...</li>
</ul>
</section>
<section title="Branching Advise">
<p>
Don't forget which branch you are currently on. This is critically
important. Committing stuff to the wrong branch causes all sorts of
headaches. Best to name your checkout after the branch you are on.
</p>
</section>
<section title="Who Manages Branching?">
<p>
All branching is currently managed by Glen Stampoultzis. If you wish
to create your own branch please let him know. Merging is also
handled by Glen. Just pop him a mail if you feel it's necessary to
create a branch or perform a merge.
</p>
<p>
The reason to go through a single point for branching is that it can be
an easy thing to get wrong. Having a single person managing branches
means there is less chance of getting getting our wires crossed with this
difficult area of CVS.
</p>
</section>
<section title="Currently Active Branches">
<p>
The following branches are currently active:
</p>
<table>
<tr>
<th>
<b>Branch</b>
</th>
<th>
<b>Description</b>
</th>
</tr>
<tr>
<td>
HEAD
</td>
<td>
This is the trunk and is always active. Currently it is being used to continue development
of the 2.0 release.
</td>
</tr>
<tr>
<td>
REL_1_5_BRANCH
</td>
<td>
All bug fixes not specifically relevant to the 2.0 work should be placed in this branch.
From here they will merged back to the trunk and the merge point marked.
</td>
</tr>
</table>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Contribution to POI</title>
<authors>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person name="Marc Johnson" email="mjohnson@apache.org"/>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Tetsuya Kitahata" email="tetsuya.kitahata@nifty.com"/>
</authors>
</header>
<body>
<section title="Introduction">
<section title="Disclaimer">
<p>
Any information in here that might be perceived as legal information is
informational only. We're not lawyers, so consult a legal professional
if needed.
</p>
</section>
<section title="The Licensing">
<p>
The POI project is <link href="http://www.opensource.org">OpenSource</link>
and developed/distributed under the <link
href="http://www.apache.org/foundation/licence-FAQ.html">
Apache Software License</link>. Unlike other licenses this license allows
free open source development; however, it does not require you to release
your source or use any particular license for your source. If you wish
to contribute to POI (which you're very welcome and encouraged to do so)
then you must agree to release the rights of your source to us under this
license.
</p>
</section>
<section title="I just signed an NDA to get a spec from Microsoft and I'd like to contribute">
<p>
In short, stay away, stay far far away. Implementing these file formats
in POI is done strictly by using public information. Public information
includes sources from other open source projects, books that state the
purpose intended is for allowing implementation of the file format and
do not require any non-disclosure agreement and just hard work.
We are intent on keeping it
legal, by contributing patches you agree to do the same.
</p>
<p>
If you've ever received information regarding the OLE 2 Compound Document
Format under any type of exclusionary agreement from Microsoft, or
(probably illegally) received such information from a person bound by
such an agreement, you cannot participate in this project. (Sorry)
</p>
<p>
Those submitting patches that show insight into the file format may be
asked to state explicitly that they are eligible or possibly sign an
agreement.
</p>
</section>
</section>
<section title="I just want to get involved but don't know where to start">
<ul>
<li>Read the rest of the website, understand what POI is and what it does,
the project vision, etc.</li>
<li>Use POI a bit, look for gaps in the documentation and examples.</li>
<li>Join the mail lists and share your knowledge with others.</li>
<li>Get <link href="http://jakarta.apache.org/site/cvsindex.html">CVS</link> and check out the POI source tree</li>
<li>Documentation is always the best place to start contributing, maybe you found that if the documentation just told you how to do X then it would make more sense, modify the documentation.</li>
<li>Get used to building POI, you'll be doing it a lot, be one with the build, know its targets, etc.</li>
<li>Write Unit Tests. Great way to understand POI. Look for classes that aren't tested, or aren't tested on a public/protected method level, start there.</li>
<li>(HSSF)Get the Excel 97 Developer's Kit - its out of print but its dirt cheap (seen copies for under $15 (US)) used on <link href="http://www.amazon.com">amazon</link>. It explains the Excel file format.</li>
<li>Submit patches (see below) of your contributions, modifications.</li>
<li>Fill out new features, see <link href="http://jakarta.apache.org/site/bugs.html">Bug database</link> for suggestions.</li>
</ul>
</section>
<section title="Submitting Patches">
<p>
Create patches by getting the latest sources from CVS (the HEAD).
Alter or add files as appropriate. Then, from the jakarta-poi directiory,
type cvs diff -u > mypatch.patch. This will capture all of your changes
in a patch file of the appropriate format. Next, if you've added any
files, create an archive (tar.bz2 preferred as its the smallest) in a
path-preserving archive format, relative to your jakarta-poi directory.
(Note: If you use <a href="http://www.wincvs.org/">WinCVS</a>, move to
[Admin] -&gt; [Command Line] Menu and type "cvs diff -u" at
[Enter a cvs line command] input field ([Commandline Settings] Tab),
while selecting the target directories or files, in order to create
unified diffs.
In other words, [Alt+A]+[Alt+C]+[Alt+C] and type "cvs diff -u".)
You'll attach both files in the next step.
</p>
<p>
Patches are submitted via the <link href="http://jakarta.apache.org/site/bugs.html">Bug Database</link>.
Create a new bug, set the subject to [PATCH] followed by a brief description. Explain you patch and any special instructions and submit/save it.
Next, go back to the bug, and create attachements for the patch files you
created. Be sure to describe not only the files purpose, but its format.
(Is that ZIP or a tgz or a bz2 or what?).
</p>
<p>
Make sure your patches include the @author tag on any files you've altered
or created. Make sure you've documented your changes and altered the
examples/etc to reflect them. Any new additions should have unit tests.
Lastly, ensure that you've provided approriate javadoc. (see
<link href="http://jakarta.apache.org/poi/resolutions/res001.html">Coding
Standards</link>). Patches that are of low quality may be rejected or
the contributer may be asked to bring them up to spec.
</p>
</section>
</body>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="HDF"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
<menu-item label="HDF Format" href="docoverview.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HDF</title>
<subtitle>Word file format</subtitle>
<authors>
<person name="S. Ryan Ackley" email="sackley@cfl.rr.com"/>
</authors>
</header>
<body>
<section title="The Word 97 File Format in semi-plain English">
<p>The purpose of this document is to give a brief high level overview of the
HDF document format. This document does not go into in-depth technical
detail and is only meant as a supplement to the Microsoft Word 97 Binary
File Format freely available at <link href="http://wotsit.org">Wotsit.org</link>.</p>
<p>The OLE file format is not discussed in this document. It is assumed that
the reader has a working knowledge of the POIFS API. </p>
<section title="Word file structure">
<p>A Word file is made up of the document text and data structures
containing formatting information about the text. Of course, this is a
very simplified illustration. There are fields and macros and other
things that have not been considered. At this stage, HDF is mainly
concerned with formatted text.</p>
</section>
<section title="Reading Word files">
<p>The entry point for HDF's reading of a Word file is the File Information
Block (FIB). This structure is the entry point for the locations and size
of a document's text and data structures. The FIB is located at the
beginning of the main stream.</p>
<section title="Text">
<p>The document's text is also located in the main stream. Its starting
location is given as FIB.fcMin and its length is given in bytes by
FIB.ccpText. These two values are not very useful in getting the text
because of unicode. There may be unicode text intermingled with ASCII
text. That brings us to the piece table.</p>
<p>The piece table is used to divide the text into non-unicode and unicode
pieces. The size and offset are given in FIB.fcClx and FIB.lcbClx
respectively. The piece table may contain Property Modifiers (prm).
These are for complex(fast-saved) files and are skipped. Each text piece
contains offsets in the main stream that contain text for that piece.
If the piece uses unicode, the file offset is masked with a certain bit.
Then you have to unmask the bit and divide by 2 to get the real file
offset. </p>
</section>
<section title="Text Formatting">
<section title="Stylesheet">
<p>All text formatting is based on styles contained in the StyleSheet.
The StyleSheet is a data structure containing among other things, style
descriptions. Each style description can contain a paragraph style and
a character style or simply a character style. Each style description
is stored in a compressed version on file. Basically these are deltas
from another style.</p>
<p>Eventually, you have to chain back to the nil style which is an
imaginary style with certain implied values.</p>
</section>
<section title="Paragraph and Character styles">
<p>Paragraph and Character formatting properties for a document's text are
stored on file as deltas from some base style in the Stylesheet. The
deltas are used to create a complete uncompressed style in memory.</p>
<p>Uncompressed paragraph styles are represented by the Pargraph
Properties(PAP) data structure. Uncompressed character styles are
represented by the Character Properties(CHP) data structure. The styles
for the document text are stored in compressed format in the
corresponding Formatted Disk Pages (FKP). A compressed PAP is referred
to as a PAPX and a compressed CHP is a CHPX. The FKP locations are
stored in the bin table. There are seperate bin tables for CHPXs and
PAPXs. The bin tables' locations and sizes are stored in the FIB.</p>
<p>A FKP is a 512 byte OLE page. It contains the offsets of the beginning
and end of each paragraph/character run in the main stream and the
compressed properties for that interval. The compessed PAPX is based on
its base style in the StyleSheet. The compressed CHPX is based on the
enclosing paragraph's base style in the Stylesheet.</p>
</section>
<section title="Uncompressing styles and other data structures">
<p>All compressed properties(CHPX, PAPX, SEPX) contain a grpprl. A grpprl
is an array of sprms. A sprm defines a delta from some base property.
There is a table of possible sprms in the Word 97 spec. Each sprm is a
two byte operand followed by a parameter. The parameter size depends on
the sprm. Each sprm describes an operation that should be performed on
the base style. After every sprm in the grpprl is performed on the base
style you will have the style for the paragraph, character run,
section, etc.</p>
</section>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HDF</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Ryan Ackley" email="sackley@apache.org"/>
</authors>
</header>
<body>
<section title="Overview">
<p>HDF is the name of OUR port of the Microsoft Word 97(-2002) file format to
pure Java.</p>
<p>HDF is still in early development. It is in the
<link href="http://cvs.apache.org/viewcvs/jakarta-poi/src/scratchpad/">scratchpad section of the
CVS.</link> Source code in the <b>org.apache.poi.hdf.extractor</b> tree is
legacy code. Source in the <b>org.apache.poi.hdf.model</b>
tree is the old legacy code refactored into an object model. Check the How-To
page for detailed examples on using HDF.
</p>
<p>
We are looking for developers!!! If you are interested in helping with HDF
familiarize yourself with the source code and just start coding. Make sure
you read the guidelines for <link href="http://jakarta.apache.org/poi/getinvolved/index.html">
getting involved</link></p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Project History</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="Brief Project History">
<p>The POI project was dreamed up back around April 2001, when
Andy Oliver landed a short term contract to do Java-based
reporting to Excel. He'd done this project a few times before
and knew right where to look for the tools he needed.
Ironically, the API he used to use had skyrocketed from around
$300 ($US) to around $10K ($US). He figured it would take two
people around six months to write an Excel port so he
recommended the client fork out the $10K.
</p>
<p>Around June 2001, Andy started thinking how great it would
be to have an open source Java tool to do this and, while he
had some spare time, he started on the project and learned
about OLE 2 Compound Document Format. After hitting some real
stumpers he realized he'd need help. He posted a message to
his local Java User's Group (JUG) and asked if anyone else
would be interested. He lucked out and the most talented Java
programmer he'd ever met, Marc Johnson, joined the project. He
ran rings around Andy at porting OLE 2 CDF and rewrote his
skeletal code into a more sophisticated library. It took Marc
a few iterations to get something they were happy with.
</p>
<p>While Marc worked on that, Andy ported XLS to Java, based
on Marc's library. Several users wrote in asking to read XLS
(not just write as had originally been planned) and one user
had special requests for a different use for POIFS. Before
long, the project scope had tripled. POI 1.0 was released a
month later than planned, but with far more features. Marc
quickly wrote the serializer framework and HSSF Serializer in
record time and Andy banged out more documentation and worked
on making people aware of the project
</p>
<p> Shortly before the release, POI was fortunate to come into
contact with Nicola -Ken- Barrozzi who gave them samples for
the HSSF Serializer and help uncover its unfortunate bugs
(which were promptly fixed). More recently, Ken ported most
of the POI project documentation to XML from Andy's crappy
HTML docs he wrote with Star Office.
</p>
<p> Around the same time as the release, Glen Stampoultzis
joined the project. Glen was ticked off at Andy's flippant attitude
towards adding graphing to HSSF. Glen got so ticked off he decided to
grab a hammer and do it himself. Glen has already become an integral
part of the POI development community; his contributions to HSSF have
already started making waves.
</p>
<p>Somewhere in there we decided to finally submit the project
to <link href="http://xml.apache.org/cocoon">The Apache
Cocoon Project</link>, only to discover the project had
outgrown fitting nicely into just Cocoon long ago.
Furthermore, Andy started eyeing other projects he'd like to
see POI functionality added to. So it was decided to donate
the Serializers and Generators to Cocoon, other POI
integration components to other projects, and the POI APIs
would become part of Jakarta. It was a bumpy road but it
looks like everything turned out since you're reading this!
</p>
</section>
<section title="What's next for POI">
<p>First we'll tackle this from a project standpoint: Well, we
made an offer to Microsoft and Actuate (tongue in cheek
... well mostly) that we'd quit the project and retire if
they'd simply write us each a really large check. I've yet to
get a phone call or email so I'm assuming they're not going to
pay us to go away.
</p>
<p>Next, we've got some work to do here at Jakarta to finish
integrating POI into the community. Furthermore, we're
still transitioning the Serializer to Cocoon.
</p>
<p>HSSF, during the 2.0 cycle, will undergo a few
optimizations. We'll also be adding new features like a full
implementation of Formulas and custom text formats. We're
hoping to be able to generate smaller files by adding
write-support for RK, MulRK and MulBlank records. I'm also
going to work on a Cocoon 2 Generator. Currently, reading is
not very efficient in HSSF. This is mainly because in order to
write or modify, one needs to be able to update upstream
pointers to downstream data. To do this you have to have
everything between in memory. A Generator would allow SAX
events to be processed instead. (This will be based on the low
level structures). One of the great things about this is that,
you'll not only have a more efficient way to read the file,
you'll have a great way to use spreadsheets as XML data
sources.
</p>
<p>The HSSF Serializer, will further separate into a general
framework for creating serializers for other formats and the
HSSF Serializer specific implementation. (This is largely
already true). We'll also be adding support for features
already supported by HSSF (styles, fonts, text formats). We're
hoping to add support for formulas during this cycle.
</p>
<p>We're beginning to expand our scope yet again. If we could
do all of this for XLS files, what about Doc files or PPT
files? We're thinking that our next component (HDF - Horrible
Document Format) should follow the same pattern. We're hoping
that new blood will join the team and allow us to tackle this
even faster (in part because POIFS is already finished). But
maybe what we need most is you! </p>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<!-- $Id$ -->
<book software="POI Project"
title="HPSF"
copyright="@year@ POI Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
</menu>
<menu label="HPSF">
<menu-item label="Overview" href="index.html"/>
<menu-item label="How To" href="how-to.html"/>
<menu-item label="Thumbnails" href="thumbnails.html"/>
<menu-item label="Internals" href="internals.html"/>
<menu-item label="To Do" href="todo.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN"
"../dtd/document-v11.dtd">
<!-- $Id$ -->
<document>
<header>
<title>HPSF HOW-TO</title>
<authors>
<person name="Rainer Klute" email="klute@apache.org"/>
</authors>
</header>
<body>
<section title="How To Use the HPSF APIs">
<p>This HOW-TO is organized in three sections. You should read them
sequentially because the later sections build upon the earlier ones.</p>
<ol>
<li>
<p>The <link href="#sec1">first section</link> explains how to read
the most important standard properties of a Microsoft Office
document. Standard properties are things like title, author, creation
date etc. It is quite likely that you will find here what you need and
don't have to read the other sections.</p>
</li>
<li>
<p>The <link href="#sec2">second section</link> goes a small step
further and focusses on reading additional standard properties. It also
talks about exceptions that may be thrown when dealing with HPSF and
shows how you can read properties of embedded objects.</p>
</li>
<li>
<p>The <link href="#sec3">third section</link> tells how to read
non-standard properties. Non-standard properties are application-specific
triples consisting of an ID, a type, and a value.</p>
</li>
</ol>
<anchor id="sec1"/>
<section title="Reading Standard Properties">
<note>This section explains how to read
the most important standard properties of a Microsoft Office
document. Standard properties are things like title, author, creation
date etc. Chances are that you will find here what you need and
don't have to read the other sections.</note>
<p>The first thing you should understand is that properties are stored in
separate documents inside the POI filesystem. (If you don't know what a
POI filesystem is, read the <link href="../poifs/index.html">POIFS
documentation</link>.) A document in a POI filesystem is also called a
<strong>stream</strong>.</p>
<p>The following example shows how to read a POI filesystem's
"title" property. Reading other properties is similar. Consider the API
documentation of <code>org.apache.poi.hpsf.SummaryInformation</code> to
learn which methods are available!</p>
<p>The standard properties this section focusses on can be found in a
document called <em>\005SummaryInformation</em> located in the root of the
POI filesystem. The notation <em>\005</em> in the document's name means
the character with the decimal value of 5. In order to read the title, an
application has to perform the following steps:</p>
<ol>
<li>
<p>Open the document <em>\005SummaryInformation</em> located in the root
of the POI filesystem.</p>
</li>
<li>
<p>Create an instance of the class <code>SummaryInformation</code> from
that document.</p>
</li>
<li>
<p>Call the <code>SummaryInformation</code> instance's
<code>getTitle()</code> method.</p>
</li>
</ol>
<p>Sounds easy, doesn't it? Here are the steps in detail.</p>
<section title="Open the document \005SummaryInformation in the root of the
POI filesystem">
<p>An application that wants to open a document in a POI filesystem
(POIFS) proceeds as shown by the following code fragment. (The full
source code of the sample application is available in the
<em>examples</em> section of the POI source tree as
<em>ReadTitle.java</em>.</p>
<source>
import java.io.*;
import org.apache.poi.hpsf.*;
import org.apache.poi.poifs.eventfilesystem.*;
// ...
public static void main(String[] args)
throws IOException
{
final String filename = args[0];
POIFSReader r = new POIFSReader();
r.registerListener(new MyPOIFSReaderListener(),
"\005SummaryInformation");
r.read(new FileInputStream(filename));
}</source>
<p>The first interesting statement is</p>
<source>POIFSReader r = new POIFSReader();</source>
<p>It creates a
<code>org.apache.poi.poifs.eventfilesystem.POIFSReader</code> instance
which we shall need to read the POI filesystem. Before the application
actually opens the POI filesystem we have to tell the
<code>POIFSReader</code> which documents we are interested in. In this
case the application should do something with the document
<em>\005SummaryInformation</em>.</p>
<source>
r.registerListener(new MyPOIFSReaderListener(),
"\005SummaryInformation");</source>
<p>This method call registers a
<code>org.apache.poi.poifs.eventfilesystem.POIFSReaderListener</code>
with the <code>POIFSReader</code>. The <code>POIFSReaderListener</code>
interface specifies the method <code>processPOIFSReaderEvent</code>
which processes a document. The class
<code>MyPOIFSReaderListener</code> implements the
<code>POIFSReaderListener</code> and thus the
<code>processPOIFSReaderEvent</code> method. The eventing POI filesystem
calls this method when it finds the <em>\005SummaryInformation</em>
document. In the sample application <code>MyPOIFSReaderListener</code> is
a static class in the <em>ReadTitle.java</em> source file.</p>
<p>Now everything is prepared and reading the POI filesystem can
start:</p>
<source>r.read(new FileInputStream(filename));</source>
<p>The following source code fragment shows the
<code>MyPOIFSReaderListener</code> class and how it retrieves the
title.</p>
<source>
static class MyPOIFSReaderListener implements POIFSReaderListener
{
public void processPOIFSReaderEvent(POIFSReaderEvent event)
{
SummaryInformation si = null;
try
{
si = (SummaryInformation)
PropertySetFactory.create(event.getStream());
}
catch (Exception ex)
{
throw new RuntimeException
("Property set stream \"" +
event.getPath() + event.getName() + "\": " + ex);
}
final String title = si.getTitle();
if (title != null)
System.out.println("Title: \"" + title + "\"");
else
System.out.println("Document has no title.");
}
}
</source>
<p>The line</p>
<source>SummaryInformation si = null;</source>
<p>declares a <code>SummaryInformation</code> variable and initializes it
with <code>null</code>. We need an instance of this class to access the
title. The instance is created in a <code>try</code> block:</p>
<source>si = (SummaryInformation)
PropertySetFactory.create(event.getStream());</source>
<p>The expression <code>event.getStream()</code> returns the input stream
containing the bytes of the property set stream named
<em>\005SummaryInformation</em>. This stream is passed into the
<code>create</code> method of the factory class
<code>org.apache.poi.hpsf.PropertySetFactory</code> which returns
a <code>org.apache.poi.hpsf.PropertySet</code> instance. It is more or
less safe to cast this result to <code>SummaryInformation</code>, a
convenience class with methods like <code>getTitle()</code>,
<code>getAuthor()</code> etc.</p>
<p>The <code>PropertySetFactory.create</code> method may throw all sorts
of exceptions. We'll deal with them in the next sections. For now we just
catch all exceptions and throw a <code>RuntimeException</code>
containing the message text of the origin exception.</p>
<p>If all goes well, the sample application retrieves the title and prints
it to the standard output. As you can see you must be prepared for the
case that the POI filesystem does not have a title.</p>
<source>final String title = si.getTitle();
if (title != null)
System.out.println("Title: \"" + title + "\"");
else
System.out.println("Document has no title.");</source>
<p>Please note that a Microsoft Office document does not necessarily
contain the <em>\005SummaryInformation</em> stream. The documents created
by the Microsoft Office suite have one, as far as I know. However, an
Excel spreadsheet exported from StarOffice 5.2 won't have a
<em>\005SummaryInformation</em> stream. In this case the applications
won't throw an exception but simply does not call the
<code>processPOIFSReaderEvent</code> method. You have been warned!</p>
</section>
</section>
<anchor id="sec2"/>
<section title="Additional Standard Properties, Exceptions And Embedded Objects">
<note>This section focusses on reading additional standard properties. It
also talks about exceptions that may be thrown when dealing with HPSF and
shows how you can read properties of embedded objects.</note>
<p>A couple of <strong>additional standard properties</strong> are not
contained in the <em>\005SummaryInformation</em> stream explained above,
for example a document's category or the number of multimedia clips in a
PowerPoint presentation. Microsoft has invented an additional stream named
<em>\005DocumentSummaryInformation</em> to hold these properties. With two
minor exceptions you can proceed exactly as described above to read the
properties stored in <em>\005DocumentSummaryInformation</em>:</p>
<ul>
<li><p>Instead of <em>\005SummaryInformation</em> use
<em>\005DocumentSummaryInformation</em> as the stream's name.</p></li>
<li><p>Replace all occurrences of the class
<code>SummaryInformation</code> by
<code>DocumentSummaryInformation</code>.</p></li>
</ul>
<p>And of course you cannot call <code>getTitle()</code> because
<code>DocumentSummaryInformation</code> has different query methods. See
the Javadoc API documentation for the details!</p>
<p>In the previous section the application simply caught all
<strong>exceptions</strong> and was in no way interested in any
details. However, a real application will likely want to know what went
wrong and act appropriately. Besides any IO exceptions there are three
HPSF resp. POI specific exceptions you should know about:</p>
<dl>
<dt><code>NoPropertySetStreamException</code>:</dt>
<dd>
<p>This exception is thrown if the application tries to create a
<code>PropertySet</code> instance from a stream that is not a
property set stream. (<code>SummaryInformation</code> and
<code>DocumentSummaryInformation</code> are subclasses of
<code>PropertySet</code>.) A faulty property set stream counts as not
being a property set stream at all. An application should be prepared to
deal with this case even if it opens streams named
<em>\005SummaryInformation</em> or
<em>\005DocumentSummaryInformation</em> only. These are just names. A
stream's name by itself does not ensure that the stream contains the
expected contents and that this contents is correct.</p>
</dd>
<dt><code>UnexpectedPropertySetTypeException</code></dt>
<dd><p>This exception is thrown if a certain type of property set is
expected somewhere (e.g. a <code>SummaryInformation</code> or
<code>DocumentSummaryInformation</code>) but the provided property
set is not of that type.</p></dd>
<dt><code>MarkUnsupportedException</code></dt>
<dd><p>This exception is thrown if an input stream that is to be parsed
into a property set does not support the
<code>InputStream.mark(int)</code> operation. The POI filesystem uses
the <code>DocumentInputStream</code> class which does support this
operation, so you are safe here. However, if you read a property set
stream from another kind of input stream things may be
different.</p></dd>
</dl>
<p>Many Microsoft Office documents contain <strong>embedded
objects</strong>, for example an Excel sheet on a page in a Word
document. Embedded objects may have property sets of their own. An
application can open these property set streams as described above. The
only difference is that they are not located in the POI filesystem's root
but in a <strong>nested directory</strong> instead. Just register a
<code>POIFSReaderListener</code> for the property set streams you are
interested in. For example, the <em>POIBrowser</em> application in the
contrib section tries to open each and every document in a POI filesystem
as a property set stream. If this operation was successful it displays the
properties.</p>
</section>
<anchor id="sec3"/>
<section title="Reading Non-Standard Properties">
<note>This section tells how to read non-standard properties. Non-standard
properties are application-specific ID/type/value triples.</note>
<section title="Overview">
<p>Now comes the real hardcode stuff. As mentioned above,
<code>SummaryInformation</code> and
<code>DocumentSummaryInformation</code> are just special cases of the
general concept of a property set. This concept says that a
<strong>property set</strong> consists of properties and that each
<strong>property</strong> is an entity with an <strong>ID</strong>, a
<strong>type</strong>, and a <strong>value</strong>.</p>
<p>Okay, that was still rather easy. However, to make things more
complicated, Microsoft in its infinite wisdom decided that a property set
shalt be broken into one or more <strong>sections</strong>. Each section
holds a bunch of properties. But since that's still not complicated
enough, a section may have an optional <strong>dictionary</strong> that
maps property IDs to <strong>property names</strong> - we'll explain
later what that means.</p>
<p>The procedure to get to the properties is the following:</p>
<ol>
<li>Use the <strong><code>PropertySetFactory</code></strong> class to
create a <code>PropertySet</code> object from a property set stream. If
you don't know whether an input stream is a property set stream, just
try to call <code>PropertySetFactory.create(java.io.InputStream)</code>:
You'll either get a <code>PropertySet</code> instance returned or an
exception is thrown.</li>
<li>Call the <code>PropertySet</code>'s method <code>getSections()</code>
to get the sections contained in the property set. Each section is
an instance of the <code>Section</code> class.</li>
<li>Each section has a format ID. The format ID of the first section in a
property set determines the property set's type. For example, the first
(and only) section of the SummaryInformation property set has a format
ID of <code>F29F85E0-4FF9-1068-AB-91-08-00-2B-27-B3-D9</code>. You can
get the format ID with <code>Section.getFormatID()</code>.</li>
<li>The properties contained in a <code>Section</code> can be retrieved
with <code>Section.getProperties()</code>. The result is an array of
<code>Property</code> instances.</li>
<li>A property has a name, a type, and a value. The <code>Property</code>
class has methods to retrieve them.</li>
</ol>
</section>
<section title="A Sample Application">
<p>Let's have a look at a sample Java application that dumps all property
set streams contained in a POI file system. The full source code of this
program can be found as <em>ReadCustomPropertySets.java</em> in the
<em>examples</em> area of the POI source code tree. Here are the key
sections:</p>
<source>import java.io.*;
import java.util.*;
import org.apache.poi.hpsf.*;
import org.apache.poi.poifs.eventfilesystem.*;
import org.apache.poi.util.HexDump;</source>
<p>The most important package the application needs is
<code>org.apache.poi.hpsf.*</code>. This package contains the HPSF
classes. Most classes named below are from the HPSF package. Of course we
also need the POIFS event file system's classes and <code>java.io.*</code>
since we are dealing with POI I/O. From the <code>java.util</code> package
we use the <code>List</code> and <code>Iterator</code> class. The class
<code>org.apache.poi.util.HexDump</code> provides a methods to dump byte
arrays as nicely formatted strings.</p>
<source>public static void main(String[] args)
throws IOException
{
final String filename = args[0];
POIFSReader r = new POIFSReader();
/* Register a listener for *all* documents. */
r.registerListener(new MyPOIFSReaderListener());
r.read(new FileInputStream(filename));
}</source>
<p>The <code>POIFSReader</code> is set up in a way that the listener
<code>MyPOIFSReaderListener</code> is called on every file in the POI file
system.</p>
</section>
<section title="The Property Set">
<p>The listener class tries to create a <code>PropertySet</code> from each
stream using the <code>PropertySetFactory.create()</code> method:</p>
<source>static class MyPOIFSReaderListener implements POIFSReaderListener
{
public void processPOIFSReaderEvent(POIFSReaderEvent event)
{
PropertySet ps = null;
try
{
ps = PropertySetFactory.create(event.getStream());
}
catch (NoPropertySetStreamException ex)
{
out("No property set stream: \"" + event.getPath() +
event.getName() + "\"");
return;
}
catch (Exception ex)
{
throw new RuntimeException
("Property set stream \"" +
event.getPath() + event.getName() + "\": " + ex);
}
/* Print the name of the property set stream: */
out("Property set stream \"" + event.getPath() +
event.getName() + "\":");</source>
<p>Creating the <code>PropertySet</code> is done in a <code>try</code>
block, because not each stream in the POI file system contains a property
set. If it is some other file, the
<code>PropertySetFactory.create()</code> throws a
<code>NoPropertySetStreamException</code>, which is caught and
logged. Then the program continues with the next stream. However, all
other types of exceptions cause the program to terminate by throwing a
runtime exception. If all went well, we can print the name of the property
set stream.</p>
</section>
<section title="The Sections">
<p>The next step is to print the number of sections followed by the
sections themselves:</p>
<source>/* Print the number of sections: */
final long sectionCount = ps.getSectionCount();
out(" No. of sections: " + sectionCount);
/* Print the list of sections: */
List sections = ps.getSections();
int nr = 0;
for (Iterator i = sections.iterator(); i.hasNext();)
{
/* Print a single section: */
Section sec = (Section) i.next();
// See below for the complete loop body.
}</source>
<p>The <code>PropertySet</code>'s method <code>getSectionCount()</code>
returns the number of sections.</p>
<p>To retrieve the sections, use the <code>getSections()</code>
method. This method returns a <code>java.util.List</code> containing
instances of the <code>Section</code> class in their proper order.</p>
<p>The sample code shows a loop that retrieves the <code>Section</code>
objects one by one and prints some information about each one. Here is
the complete body of the loop:</p>
<source>/* Print a single section: */
Section sec = (Section) i.next();
out(" Section " + nr++ + ":");
String s = hex(sec.getFormatID().getBytes());
s = s.substring(0, s.length() - 1);
out(" Format ID: " + s);
/* Print the number of properties in this section. */
int propertyCount = sec.getPropertyCount();
out(" No. of properties: " + propertyCount);
/* Print the properties: */
Property[] properties = sec.getProperties();
for (int i2 = 0; i2 &lt; properties.length; i2++)
{
/* Print a single property: */
Property p = properties[i2];
int id = p.getID();
long type = p.getType();
Object value = p.getValue();
out(" Property ID: " + id + ", type: " + type +
", value: " + value);
}</source>
</section>
<section title="The Section's Format ID">
<p>The first method called on the <code>Section</code> instance is
<code>getFormatID()</code>. As explained above, the format ID of the
first section in a property set determines the type of the property
set. Its type is <code>ClassID</code> which is essentially a sequence of
16 bytes. A real application using its own type of a custom property set
should have defined a unique format ID and, when reading a property set
stream, should check the format ID is equal to that unique format ID. The
sample program just prints the format ID it finds in a section:</p>
<source>String s = hex(sec.getFormatID().getBytes());
s = s.substring(0, s.length() - 1);
out(" Format ID: " + s);</source>
<p>As you can see, the <code>getFormatID()</code> method returns a
<code>ClassID</code> object. An array containing the bytes can be
retrieved with <code>ClassID.getBytes()</code>. In order to get a nicely
formatted printout, the sample program uses the <code>hex()</code> helper
method which in turn uses the POI utility class <code>HexDump</code> in
the <code>org.apache.poi.util</code> package. Another helper method is
<code>out()</code> which just saves typing
<code>System.out.println()</code>.</p>
</section>
<section title="The Properties">
<p>Before getting the properties, it is possible to find out how many
properties are available in the section via the
<code>Section.getPropertyCount()</code>. The sample application uses this
method to print the number of properties to the standard output:</p>
<source>int propertyCount = sec.getPropertyCount();
out(" No. of properties: " + propertyCount);</source>
<p>Now its time to get to the properties themselves. You can retrieve a
section's properties with the method
<code>Section.getProperties()</code>:</p>
<source>Property[] properties = sec.getProperties();</source>
<p>As you can see the result is an array of <code>Property</code>
objects. This class has three methods to retrieve a property's ID, its
type, and its value. The following code snippet shows how to call
them:</p>
<source>for (int i2 = 0; i2 &lt; properties.length; i2++)
{
/* Print a single property: */
Property p = properties[i2];
int id = p.getID();
long type = p.getType();
Object value = p.getValue();
out(" Property ID: " + id + ", type: " + type +
", value: " + value);
}</source>
</section>
<section title="Sample Output">
<p>The output of the sample program might look like the following. It
shows the summary information and the document summary information
property sets of a Microsoft Word document. However, unlike the first and
second section of this HOW-TO the application does not have any code
which is specific to the <code>SummaryInformation</code> and
<code>DocumentSummaryInformation</code> classes.</p>
<source>Property set stream "/SummaryInformation":
No. of sections: 1
Section 0:
Format ID: 00000000 F2 9F 85 E0 4F F9 10 68 AB 91 08 00 2B 27 B3 D9 ....O..h....+'..
No. of properties: 17
Property ID: 1, type: 2, value: 1252
Property ID: 2, type: 30, value: Titel
Property ID: 3, type: 30, value: Thema
Property ID: 4, type: 30, value: Rainer Klute (Autor)
Property ID: 5, type: 30, value: Test (Stichwörter)
Property ID: 6, type: 30, value: This is a document for testing HPSF
Property ID: 7, type: 30, value: Normal.dot
Property ID: 8, type: 30, value: Unknown User
Property ID: 9, type: 30, value: 3
Property ID: 18, type: 30, value: Microsoft Word 9.0
Property ID: 12, type: 64, value: Mon Jan 01 00:59:25 CET 1601
Property ID: 13, type: 64, value: Thu Jul 18 16:22:00 CEST 2002
Property ID: 14, type: 3, value: 1
Property ID: 15, type: 3, value: 20
Property ID: 16, type: 3, value: 93
Property ID: 19, type: 3, value: 0
Property ID: 17, type: 71, value: [B@13582d
Property set stream "/DocumentSummaryInformation":
No. of sections: 2
Section 0:
Format ID: 00000000 D5 CD D5 02 2E 9C 10 1B 93 97 08 00 2B 2C F9 AE ............+,..
No. of properties: 14
Property ID: 1, type: 2, value: 1252
Property ID: 2, type: 30, value: Test
Property ID: 14, type: 30, value: Rainer Klute (Manager)
Property ID: 15, type: 30, value: Rainer Klute IT-Consulting GmbH
Property ID: 5, type: 3, value: 3
Property ID: 6, type: 3, value: 2
Property ID: 17, type: 3, value: 111
Property ID: 23, type: 3, value: 592636
Property ID: 11, type: 11, value: false
Property ID: 16, type: 11, value: false
Property ID: 19, type: 11, value: false
Property ID: 22, type: 11, value: false
Property ID: 13, type: 4126, value: [B@56a499
Property ID: 12, type: 4108, value: [B@506411
Section 1:
Format ID: 00000000 D5 CD D5 05 2E 9C 10 1B 93 97 08 00 2B 2C F9 AE ............+,..
No. of properties: 7
Property ID: 0, type: 0, value: {6=Test-JaNein, 5=Test-Zahl, 4=Test-Datum, 3=Test-Text, 2=_PID_LINKBASE}
Property ID: 1, type: 2, value: 1252
Property ID: 2, type: 65, value: [B@c9ba38
Property ID: 3, type: 30, value: This is some text.
Property ID: 4, type: 64, value: Wed Jul 17 00:00:00 CEST 2002
Property ID: 5, type: 3, value: 27
Property ID: 6, type: 11, value: true
No property set stream: "/WordDocument"
No property set stream: "/CompObj"
No property set stream: "/1Table"</source>
<p>There are some interesting items to note:</p>
<ul>
<li>The first property set (summary information) consists of a single
section, the second property set (document summary information) consists
of two sections.</li>
<li>Each section type (identified by its format ID) has its own domain of
property ID. For example, in the second property set the properties with
ID 2 have different meanings in the two section. By the way, the format
IDs of these sections are <strong>not</strong> equal, but you have to
look hard to find the difference.</li>
<li>The properties are not in any particular order in the section,
although they slightly tend to be sorted by their IDs.</li>
</ul>
</section>
<section title="Property IDs">
<p>Properties in the same section are distinguished by their IDs. This is
similar to variables in a programming language like Java, which are
distinguished by their names. But unlike variable names, property IDs are
simple integral numbers. There is another similarity, however. Just like
a Java variable has a certain scope (e.g. a member variables in a class),
a property ID also has its scope of validity: the section.</p>
<p>Two property IDs in sections with different section format IDs
don't have the same meaning even though their IDs might be equal. For
example, ID 4 in the first (and only) section of a summary
information property set denotes the document's author, while ID 4 in the
first section of the document summary information property set means the
document's byte count. The sample output above does not show a property
with an ID of 4 in the first section of the document summary information
property set. That means that the document does not have a byte
count. However, there is a property with an ID of 4 in the
<em>second</em> section: This is a user-defined property ID - we'll get
to that topic in a minute.</p>
<p>So, how can you find out what the meaning of a certain property ID in
the summary information and the document summary information property set
is? The standard property sets as such don't have any hints about the
<strong>meanings of their property IDs</strong>. For example, the summary
information property set does not tell you that the property ID 4 stands
for the document's author. This is external knowledge. Microsoft defined
standard meanings for some of the property IDs in the summary information
and the document summary information property sets. As a help to the Java
and POI programmer, the class <code>PropertyIDMap</code> in the
<code>org.apache.poi.hpsf.wellknown</code> package defines constants
for the "well-known" property IDs. For example, there is the
definition</p>
<source>public final static int PID_AUTHOR = 4;</source>
<p>These definitions allow you to use symbolic names instead of
numbers.</p>
<p>In order to provide support for the other way, too, - i.e. to map
property IDs to property names - the class <code>PropertyIDMap</code>
defines two static methods:
<code>getSummaryInformationProperties()</code> and
<code>getDocumentSummaryInformationProperties()</code>. Both return
<code>java.util.Map</code> objects which map property IDs to
strings. Such a string gives a hint about the property's meaning. For
example,
<code>PropertyIDMap.getSummaryInformationProperties().get(4)</code>
returns the string "PID_AUTHOR". An application could use this string as
a key to a localized string which is displayed to the user, e.g. "Author"
in English or "Verfasser" in German. HPSF might provide such
language-dependend ("localized") mappings in a later release.</p>
<p>Usually you won't have to deal with those two maps. Instead you should
call the <code>Section.getPIDString(int)</code> method. It returns the
string associated with the specified property ID in the context of the
<code>Section</code> object.</p>
<p>Above you learned that property IDs have a meaning in the scope of a
section only. However, there are two exceptions to the rule: The property
IDs 0 and 1 have a fixed meaning in <strong>all</strong> sections:</p>
<table>
<tr>
<th>Property ID</th>
<th>Meaning</th>
</tr>
<tr>
<td>0</td>
<td>The property's value is a <strong>dictionary</strong>, i.e. a
mapping from property IDs to strings.</td>
</tr>
<tr>
<td>1</td>
<td>The property's value is the number of a <strong>codepage</strong>,
i.e. a mapping from character codes to characters. All strings in the
section containing this property must be interpreted using this
codepage. Typical property values are 1252 (8-bit "western" characters)
or 1200 (16-bit Unicode characters).</td>
</tr>
</table>
</section>
<section title="Property types">
<p>A property is nothing without its value. It is stored in a property set
stream as a sequence of bytes. You must know the property's
<strong>type</strong> in order to properly interpret those bytes and
reasonably handle the value. A property's type is one of the so-called
Microsoft-defined <strong>"variant types"</strong>. When you call
<code>Property.getType()</code> you'll get a <code>long</code> value
which denoting the property's variant type. The class
<code>Variant</code> in the <code>org.apache.poi.hpsf</code> package
holds most of those <code>long</code> values as named constants. For
example, the constant <code>VT_I4 = 3</code> means a signed integer value
of four bytes. Examples of other types are <code>VT_LPSTR = 30</code>
meaning a null-terminated string of 8-bit characters, <code>VT_LPWSTR =
31</code> which means a null-terminated Unicode string, or <code>VT_BOOL
= 11</code> denoting a boolean value.</p>
<p>In most cases you won't need a property's type because HPSF does all
the work for you.</p>
</section>
<section title="Property values">
<p>When an application wants to retrieve a property's value and calls
<code>Property.getValue()</code>, HPSF has to interpret the bytes making
out the value according to the property's type. The type determines how
many bytes the value consists of and what
to do with them. For example, if the type is <code>VT_I4</code>, HPSF
knows that the value is four bytes long and that these bytes
comprise a signed integer value in the little-endian format. This is
quite different from e.g. a type of <code>VT_LPWSTR</code>. In this case
HPSF has to scan the value bytes for a Unicode null character and collect
everything from the beginning to that null character as a Unicode
string.</p>
<p>The good new is that HPSF does another job for you, too: It maps the
variant type to an adequate Java type.</p>
<table>
<tr>
<th>Variant type:</th>
<th>Java type:</th>
</tr>
<tr>
<td>VT_I2</td>
<td>java.lang.Integer</td>
</tr>
<tr>
<td>VT_I4</td>
<td>java.lang.Long</td>
</tr>
<tr>
<td>VT_FILETIME</td>
<td>java.util.Date</td>
</tr>
<tr>
<td>VT_LPSTR</td>
<td>java.lang.String</td>
</tr>
<tr>
<td>VT_LPWSTR</td>
<td>java.lang.String</td>
</tr>
<tr>
<td>VT_CF</td>
<td>byte[]</td>
</tr>
<tr>
<td>VT_BOOL</td>
<td>java.lang.Boolean</td>
</tr>
</table>
<p>The bad news is that there are still a couple of variant types HPSF
does not yet support. If it encounters one of these types it
returns the property's value as a byte array and leaves it to be
interpreted by the application.</p>
<p>An application retrieves a property's value by calling the
<code>Property.getValue()</code> method. This method's return type is the
abstract <code>Object</code> class. The <code>getValue()</code> method
looks up the property's variant type, reads the property's value bytes,
creates an instance of an adequate Java type, assigns it the property's
value and returns it. Primitive types like <code>int</code> or
<code>long</code> will be returned as the corresponding class,
e.g. <code>Integer</code> or <code>Long</code>.</p>
</section>
<section title="Dictionaries">
<p>The property with ID 0 has a very special meaning: It is a
<strong>dictionary</strong> mapping property IDs to property names. We
have seen already that the meanings of standard properties in the
summary information and the document summary information property sets
have been defined by Microsoft. The advantage is that the labels of
properties like "Author" or "Title" don't have to be stored in the
property set. However, a user can define custom fields in, say, Microsoft
Word. For each field the user has to specify a name, a type, and a
value.</p>
<p>The names of the custom-defined fields (i.e. the property names) are
stored in the document summary information second section's
<strong>dictionary</strong>. The dictionary is a map which associates
property IDs with property names.</p>
<p>The method <code>Section.getPIDString(int)</code> not only returns with
the well-known property names of the summary information and document
summary information property sets, but with self-defined properties,
too. It should also work with self-defined properties in self-defined
sections.</p>
</section>
<section title="Codepage support">
<fixme author="Rainer Klute">Improve codepage support!</fixme>
<p>The property with ID 1 holds the number of the codepage which was used
to encode the strings in this section. The present HPSF codepage support
is still very limited: When reading property value strings, HPSF
distinguishes between 16-bit characters and 8-bit characters. 16-bit
characters should be Unicode characters and thus be okay. 8-bit
characters are interpreted according to the platform's default character
set. This is fine as long as the document being read has been written on
a platform with the same default character set. However, if you receive a
document from another region of the world and want to process it with
HPSF you are in trouble - unless the creator used Unicode, of course.</p>
</section>
<section title="Further Reading">
<p>There are still some aspects of HSPF left which are not covered by this
HOW-TO. You should dig into the Javadoc API documentation to learn
further details. Since you've struggled through this document up to this
point, you are well prepared.</p>
</section>
</section>
</section>
</body>
</document>
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<!-- $Id$ -->
<document>
<header>
<title>HPSF (Horrible Property Set Format)</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Rainer Klute" email="klute@apache.org"/>
</authors>
</header>
<body>
<section title="Overview">
<p>Microsoft applications like "Word", "Excel" or "Powerpoint" let the user
describe his document by properties like "title", "category" and so on. The
application itself adds further information: last author, creation date
etc. These document properties are stored in so-called <strong>property set
streams</strong>. A property set stream is a separate document within a
<link href="../poifs/index.html">POI filesystem</link>. We'll call property
set streams mostly just "property sets". HPSF is POI's pure-Java
implementation to read (and in future to write) property sets.</p>
<p>The <link href="how-to.html">HPSF HOWTO</link> describes what a Java
application should do to read a property set using HPSF and to retrieve the
information it needs.</p>
<p>HPSF supports OLE2 property set streams in general, and is not limited to
the special case of document properties in the Microsoft Office files
mentioned above. The <link href="internals.html">HPSF description</link>
describes the internal structure of property set streams. A separate
document explains the internal of <link href="thumbnails.html">thumbnail
images</link>.</p>
</section>
</body>
</document>
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN"
"../dtd/document-v11.dtd">
<!-- $Id$ -->
<document>
<header>
<title>HPSF THUMBNAIL HOW-TO</title>
<authors>
<person name="Drew Varner" email="Drew.Varner@-deleteThis-sc.edu" />
</authors>
</header>
<body>
<section title="The VT_CF Format">
<p>Thumbnail information is stored as a VT_CF, or Thumbnail Variant. The
Thumbnail Variant is used to store various types of information in a
clipboard. The VT_CF can store information in formats for the Macintosh or
Windows clipboard.</p>
<p>There are many types of data that can be copied to the clipboard, but the
only types of information needed for thumbnail manipulation are the image
formats.</p>
<p>The <code>VT_CF</code> structure looks like this:</p>
<table>
<tr>
<th>Element:</th>
<td>Clipboard Size</td>
<td>Clipboard Format Tag</td>
<td>Clipboard Data</td>
</tr>
<tr>
<th>Size:</th>
<td>32 bit unsigned integer (DWord)</td>
<td>32 bit signed integer (DWord)</td>
<td>variable length (byte array)</td>
</tr>
</table>
<p>The Clipboard Size refers to the size (in bytes) of Clipboard Data
(variable size) plus the Clipboard Format (four bytes).</p>
<p>Clipboard Format Tag has four possible values:</p>
<table>
<tr>
<th>Value</th>
<th>Identifier</th>
<th>Description</th>
</tr>
<tr>
<td><code>-1L</code></td>
<td><code>CFTAG_WINDOWS</code></td>
<td>a built-in Windows&copy; clipboard format value</td>
</tr>
<tr>
<td><code>-2L</code></td>
<td><code>CFTAG_MACINTOSH</code></td>
<td>a Macintosh clipboard format value</td>
</tr>
<tr>
<td><code>-3L</code></td>
<td><code>CFTAG_FMTID</code></td>
<td>a format identifier (FMTID) This is rarely used.</td>
</tr>
<tr>
<td><code>0L</code></td>
<td><code>CFTAG_NODATA</code></td>
<td>No data This is rarely used.</td>
</tr>
</table>
</section>
<section title="Windows Clipboard Data">
<p>Windows clipboard data has four image formats for thumbnails:</p>
<table>
<tr>
<th>Value</th>
<th>Identifier</th>
<th>Description</th>
</tr>
<tr>
<td>3</td>
<td><code>CF_METAFILEPICT</code></td>
<td>Windows metafile format - recommended</td>
</tr>
<tr>
<td>8</td>
<td><code>CF_DIB</code></td>
<td>Device Independent Bitmap</td>
</tr>
<tr>
<td>14</td>
<td><code>CF_ENHMETAFILE</code></td>
<td>Enhanced Windows metafile format</td>
</tr>
<tr>
<td>2</td>
<td><code>CF_BITMAP</code></td>
<td>Bitmap - Obsolete - Use <code>CF_DIB</code> instead</td>
</tr>
</table>
</section>
<section title="Windows Metafile Format">
<p>The most common format for thumbnails on the Windows platform is the
Windows metafile format. The Clipboard places and extra header in front of
a the standard Windows Metafile Format data.</p>
<p>The Clipboard Data byte array looks like this when an image is stored in
Windows' Clipboard WMF format.</p>
<table>
<tr>
<th>Identifier</th>
<td>CF_METAFILEPICT</td>
<td>mm</td>
<td>width</td>
<td>height</td>
<td>handle</td>
<td>WMF data</td>
</tr>
<tr>
<th>Size</th>
<td>32 bit unsigned int</td>
<td>16 bit unsigned(?) int</td>
<td>16 bit unsigned(?) int</td>
<td>16 bit unsigned(?) int</td>
<td>16 bit unsigned(?) int</td>
<td>byte array - variable length</td>
</tr>
<tr>
<th>Description</th>
<td>Clipboard WMF</td>
<td>Mapping Mode</td>
<td>Image Width</td>
<td>Image Height</td>
<td>handle to the WMF data array in memory, or 0</td>
<td>standard WMF byte stream</td>
</tr>
</table>
</section>
<section title="Device Independent Bitmap">
<p><strong>FIXME:</strong> Describe the Device Independent Bitmap
format!</p>
</section>
<section title="Macintosh Clipboard Data">
<p><strong>FIXME:</strong> Describe the Macintosh clipboard formats!</p>
</section>
</body>
</document>
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<!-- $Id$ -->
<document>
<header>
<title>To Do</title>
<authors>
<person name="Rainer Klute" email="klute@rainer-klute.de"/>
</authors>
</header>
<body>
<section title="To Do">
<p>The following functionalities should be added to HPFS:</p>
<ol>
<li>
<p>Add writing capability for property sets. Presently property sets can
be read only.</p>
</li>
<li>
<p>Add codepage support: Presently the bytes making out the string in a
property's value are interpreted using the platform's default character
set.</p>
</li>
<li>
<p>Add resource bundles to
<code>org.apache.poi.hpsf.wellknown</code> to ease
localizations. This would be useful for mapping standard property IDs to
localized strings. Example: The property ID 4 could be mapped to "Author"
in English or "Verfasser" in German.</p>
</li>
<li>
<p>Implement reading functionality for those property types that are not
yet supported. HPSF should return proper Java types instead of just byte
arrays.</p>
</li>
<li>
<p>Add WMF to <code>java.awt.Image</code> example code in <link
href="thumbnails.html">Thumbnail
HOW TO</link>.</p>
</li>
</ol>
</section>
</body>
</document>
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Alternatives to HSSF</subtitle>
<authors>
<person name="Andrew Oliver" email="acoliver at apache.org"/>
<person name="Glen Stampoultzis" email="glens at apache.org"/>
</authors>
</header>
<body>
<section title="Alternatives">
<p>
Maybe it's unwise to advertise your competitors but we believe
competition is good and we have the best support reading and
write Excel workbooks currently available.
</p>
<table>
<tr>
<td><b>Product</b></td>
<td><b>URL</b></td>
<td><b>Description</b></td>
</tr>
<tr>
<td>JSC</td>
<td>
<link href="http://jsc.tomschuetz.com">jsc.tomschuetz.com</link>
</td>
<td>Reading, calculating standard and VBA functions with
Java at runtime.
</td>
</tr>
<tr>
<td>Formula One</td>
<td>
<link href="http://www.tidestone.com/">ReportingEngines (division of Actuate Corporation)</link>
</td>
<td>An alternative to this project is to
buy the $5000 per server installation.</td>
</tr>
<tr>
<td>Visual Basic</td>
<td>
<link href="http://www.microsoft.com/">www.microsoft.com</link>
</td>
<td>Give up XML and write Visual Basic code on a Microsoft Windows based
Environment or output in Microsoft's beta and primarily undocumented
XML for office format.</td>
</tr>
<tr>
<td>JExcel</td>
<td>http://stareyes.homeip.net:8888</td>
<td>Frequently unavailable. Little currently known about it's capabilities.</td>
</tr>
<tr>
<td>JWorkbook</td>
<td>http://www.object-refinery.com/jworkbook/index.html</td>
<td>This effort supports Gnumeric and Excel, however the Excel part is done using POI anyway.</td>
</tr>
<tr>
<td>xlReader</td>
<td><link href="http://www.sourceforge.net/projects/xlrd">http://www.sourceforge.net/projects/xlrd</link></td>
<td>Provides decent support for reading Excel.</td>
</tr>
<tr>
<td>Excel ODBC Driver</td>
<td><link href="http://www.nwlink.com/~leewal/content/exceljavasample.htm">http://www.nwlink.com/~leewal/content/exceljavasample.htm</link></td>
<td>ODBC offers a somewhat wierd method for using Excel.</td>
</tr>
<tr>
<td>ExtenXLS</td>
<td><link href="http://www.extentech.com/products/ExtenXLS/docs/intro3.jsp">http://www.extentech.com/products/ExtenXLS/docs/intro3.jsp</link></td>
<td>Commercial library for reading, modifying and writing Excel spreadsheets. Not cheap but
certainly a lot more affordable than Formula 1. No idea as to it's quality.</td>
</tr>
<tr>
<td>J-Integra Java-Excel Bridge</td>
<td><link href="http://www.intrinsyc.com/products/bridging/jintegra.asp">http://www.intrinsyc.com/products/bridging/jintegra.asp</link></td>
<td>Uses DCOM to an Excel instance on a windows machine.</td>
</tr>
<tr>
<td>Perl &amp; C</td>
<td>-</td>
<td>There are a number of perl and C libraries, however none of them are consistent.</td>
</tr>
<tr>
<td>VistaJDBC</td>
<td><link href="http://www.vistaportal.com/products/vistajdbc.htm">http://www.vistaportal.com/products/vistajdbc.htm</link></td>
<td>VistaJDBC driver works with both StarOffice and Excel spreadsheets and
can access data using standard SQL statements without any API programming.
VistaJDBC also implemented ability to choose by not just rows and columns but by
specific cells, ranges of cells, etc.
</td>
</tr>
<tr>
<td>Coldtags Excel Tag Library</td>
<td><link href="http://www.servletsuite.com/servlets/exceltag.htm">http://www.servletsuite.com/servlets/exceltag.htm</link></td>
<td>
This library outputs a simple CSV file, in which cells can
contain numbers or text. You could output a CSV file without its
help, but it gives a little more readability/structure to the code, and
could be extended to handle more complexity. When
you invoke one of these JSP pages from your browser, you open up an Excel
spreadsheet. There's no formatting, worksheets, or anything fancy like that.
So it's not strictly a competitor but it does the job.
</td>
</tr>
</table>
</section>
</body>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="HSSF"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
</menu>
<menu label="HSSF">
<menu-item label="Quick Guide" href="quick-guide.html"/>
<menu-item label="HOWTO" href="how-to.html"/>
<menu-item label="Formula Support" href="formula.html" />
<menu-item label="Use Case" href="use-case.html"/>
<menu-item label="Pictorial Docs" href="diagrams.html"/>
<menu-item label="Alternatives" href="alternatives.html"/>
<menu-item label="Limitations" href="limitations.html"/>
</menu>
<menu label="Contributer's Guide">
<menu-item label="Hacking HSSF" href="hacking-hssf.html"/>
<menu-item label="Record Generator" href="record-generator.html"/>
<menu-item label="Charts" href="chart.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Usermodel Class Diagram by Matthew Young">
<img src="images/usermodel.gif"/>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Overview">
<p>
This section is intended for diagrams (UML/etc) that help
explain HSSF.
</p>
<ul>
<li>
<link href="diagram1.html">HSSF usermodel class diagram</link> -
by Matthew Young (myoung at westernasset dot com)
</li>
</ul>
<p>
Have more? Add a new &quot;bug&quot; to the bug database with [DOCUMENTATION]
prefacing the description and a link to the file on an http server
somewhere. If you don't have your own webserver, then you can email it
to (acoliver at apache dot org) provided its &lt; 5MB. Diagrams should be
in some format that can be read at least on Linux and Windows. Diagrams
that can be edited are preferrable, but lets face it, there aren't too
many good affordable UML tools yet! And no they don't HAVE to be UML...
just useful.
</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Formula Support</title>
<authors>
<person email="avik@apache.org" name="Avik Sengupta" id="AS"/>
</authors>
</header>
<body>
<section title="Introduction">
<p>
This document describes the current state of formula support in POI.
The information in this document applies to the 2.0-dev version of POI (i.e. CVS HEAD).
Since this area is a work in progress, this document will be updated with new features as and
when they are added.
</p>
</section>
<section title="The basics">
<p>
In org.apache.poi.hssf.usermodel.HSSFCell
<strong> setCellFormula(&quot;formulaString&quot;) </strong> is used to add a formula to sheet and
<strong> getCellFormula() </strong> is used to retrieve the string representation of a formula.
</p>
<p>
We aim to support the complete excel grammer for formulas. Thus, the string that you pass in
to the <b> setCellFormula </b> call should be what you expect to type into excel. Also, note
that you should NOT add a "=" to the front of the string.
</p>
</section>
<section title="Supported Features">
<ul>
<li>Cell References</li>
<li>String, integer and floating point literals</li>
<li>Area references</li>
<li>Relative or absolute references</li>
<li>Arithmetic Operators</li>
<li>Sheet Functions</li>
</ul>
</section>
<section title="Partially supported">
<ul>
<li>
The formula parser now has the ability to parse formulas containing strings. However
formulas that return a string value are not yet supported.
</li>
<li>Formula tokens in Excel are stored in one of three possible <em> classes </em>:
Reference, Value and Array. Based on the location of a token, its class can change
in complicated and undocumented ways. While we have support for most cases, we
are not sure if we have covered all bases (since there is no documentation for this area.)
We would therefore like you to report any
occurence of #VALUE! in a cell upon opening a POI generated workbook in excel. (Check that
typing the formula into Excel directly gives a valid result.)
</li>
</ul>
</section>
<section title="Not yet supported">
<ul>
<li>Array formulas</li>
<li>Formulas with logical operations (IF) </li>
<li>Sheet References in formulas</li>
<li>Everything else :) </li>
</ul>
</section>
<section title="Internals">
<p>
Formulas in Excel are stored as sequences of tokens in Reverse Polish Notation order. The
<link href="http://sc.openoffice.org/excelfileformat.pdf">open office XLS spec</link> is the best
documentation you will find for the format.
</p>
<p>
The tokens used by excel are modelled as individual *Ptg classes in the <strong>
org.apache.poi.hssf.record.formula</strong> package.
</p>
<p>
The task of parsing a formula string into an array of RPN ordered tokens is done by the <strong>
org.apache.poi.hssf.record.formula.FormulaParser</strong> class. This class implements a hand
written recursive descent parser.
</p>
<p>Check out the <link href="http://jakarta.apache.org/poi/javadocs/">javadocs </link> for details.
</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Hacking HSSF</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
<person email="acoliver@apache.org" name="Andrew Oliver" id="AO"/>
</authors>
</header>
<body>
<section title="Where Can I Find Documentation on Feature X">
<p>
You might find the
'Excel 97 Developer's Kit' (out of print, Microsoft Press, no
restrictive covenants, available on Amazon.com) helpful for
understanding the file format.
</p>
<p>
Also useful is the <link href="http://sc.openoffice.org/excelfileformat.pdf">open office XLS spec</link>. We
are collaborating with the maintainer of the spec so if you think you can add something to their
document just send through your changes.
</p>
</section>
<section title="Help, I Can't Find Feature X Documented Anywhere">
<ol>
<li>
Look at OpenOffice.org or Gnumeric sources if its implemented there.
</li>
<li>
Use org.apache.poi.hssf.dev.BiffViewer to view the structure of the
file. Experiment by adding one criteria entry at a time. See what it
does to the structure, infer behavior and structure from it. Using the
unix diff command (or get cygwin from www.cygwin.com for windows) you
can figure out a lot very quickly. Unimplemented records show up as
'UNKNOWN' and prints a hex dump.
</li>
</ol>
</section>
<section title="Low-level Record Generation">
<p>
Low level records can be time consuming to created. We created a record
generator to help generate some of the simpler tasks.
</p>
<p>
We use XML
descriptors to generate the Java code (which sure beats the heck out of
the PERL scripts originally used ;-) for low level records. The
generator is kinda alpha-ish right now and could use some enhancement,
so you may find that to be about 1/2 of the work. Notice this is in
org.apache.poi.hssf.record.definitions.
</p>
</section>
<section title="Important Notice">
<p>One thing to note: If you are making a large code contribution we need to ensure
any participants in this process have never
signed a "Non Disclosure Agreement" with Microsoft, and have not
received any information covered by such an agreement. If they have
they'll not be able to participate in the POI project. For large contributions we
may ask you to sign an agreement.</p>
</section>
<section title="What Can I Work On?">
<p>Check our <link href="../todo.html">todo list</link> or simply look for missing functionality. Start small
and work your way up.</p>
</section>
<section title="What Else Should I Know?">
<p>Make sure you <link href="http://jakarta.apache.org/poi/contrib.html">read the contributing section</link>
as it contains more generation information about contributing to Poi in general.</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>The New Halloween Document</title>
<authors>
<person email="acoliver2@users.sourceforge.net" name="Andrew C. Oliver" id="AO"/>
<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
<person email="sergeikozello@mail.ru" name="Sergei Kozello" id="SK"/>
</authors>
</header>
<body>
<section title="How to use the HSSF prototype API">
<section title="Capabilities">
<p>This release of the how-to outlines functionality for the CVS HEAD.
Those looking for information on previous releases should
look in the documentation distributed with that release.</p>
<p>
This release allows numeric and string cell values to be written to
or read from an XLS file as well as reading and writing dates. Also
in this release is row and column sizing, cell styling (bold,
italics, borders,etc), and support for both built-in and user
defined data formats. New
to this release is an event-based API for reading XLS files.
It differs greatly from the read/write API
and is intended for intermediate developers who need a smaller
memory footprint. It will also serve as the basis for the HSSF
Generator.</p>
</section>
<section title="General Use">
<section title="User API">
<section title="Writing a new one">
<p>The high level API (package: org.apache.poi.hssf.usermodel)
is what most people should use. Usage is very simple.
</p>
<p>Workbooks are created by creating an instance of
org.apache.poi.hssf.usermodel.HSSFWorkbook.
</p>
<p>Sheets are created by calling createSheet() from an existing
instance of HSSFWorkbook, the created sheet is automatically added in
sequence to the workbook. Sheets do not in themselves have a sheet
name (the tab at the bottom); you set
the name associated with a sheet by calling
HSSFWorkbook.setSheetName(sheetindex,&quot;SheetName&quot;,encoding).
The name may be in 8bit format (HSSFWorkbook.ENCODING_COMPRESSED_UNICODE)
or Unicode (HSSFWorkbook.ENCODING_UTF_16). Default encoding is 8bit per char.
</p>
<p>Rows are created by calling createRow(rowNumber) from an existing
instance of HSSFSheet. Only rows that have cell values should be
added to the sheet. To set the row's height, you just call
setRowHeight(height) on the row object. The height must be given in
twips, or 1/20th of a point. If you prefer, there is also a
setRowHeightInPoints method.
</p>
<p>Cells are created by calling createCell(column, type) from an
existing HSSFRow. Only cells that have values should be added to the
row. Cells should have their cell type set to either
HSSFCell.CELL_TYPE_NUMERIC or HSSFCell.CELL_TYPE_STRING depending on
whether they contain a numeric or textual value. Cells must also have
a value set. Set the value by calling setCellValue with either a
String or double as a parameter. Individual cells do not have a
width; you must call setColumnWidth(colindex, width) (use units of
1/256th of a character) on the HSSFSheet object. (You can't do it on
an individual basis in the GUI either).</p>
<p>Cells are styled with HSSFCellStyle objects which in turn contain
a reference to an HSSFFont object. These are created via the
HSSFWorkbook object by calling createCellStyle() and createFont().
Once you create the object you must set its parameters (colors,
borders, etc). To set a font for an HSSFCellStyle call
setFont(fontobj).
</p>
<p>Once you have generated your workbook, you can write it out by
calling write(outputStream) from your instance of Workbook, passing
it an OutputStream (for instance, a FileOutputStream or
ServletOutputStream). You must close the OutputStream yourself. HSSF
does not close it for you.
</p>
<p>Here is some example code (excerpted and adapted from
org.apache.poi.hssf.dev.HSSF test class):</p>
<source><![CDATA[
short rownum;
// create a new file
FileOutputStream out = new FileOutputStream("workbook.xls");
// create a new workbook
HSSFWorkbook wb = new HSSFWorkbook();
// create a new sheet
HSSFSheet s = wb.createSheet();
// declare a row object reference
HSSFRow r = null;
// declare a cell object reference
HSSFCell c = null;
// create 3 cell styles
HSSFCellStyle cs = wb.createCellStyle();
HSSFCellStyle cs2 = wb.createCellStyle();
HSSFCellStyle cs3 = wb.createCellStyle();
HSSFDataFormat df = wb.createDataFormat();
// create 2 fonts objects
HSSFFont f = wb.createFont();
HSSFFont f2 = wb.createFont();
//set font 1 to 12 point type
f.setFontHeightInPoints((short) 12);
//make it blue
f.setColor( (short)0xc );
// make it bold
//arial is the default font
f.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//set font 2 to 10 point type
f2.setFontHeightInPoints((short) 10);
//make it red
f2.setColor( (short)HSSFFont.COLOR_RED );
//make it bold
f2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
f2.setStrikeout( true );
//set cell stlye
cs.setFont(f);
//set the cell format
cs.setDataFormat(df.getFormat("#,##0.0"));
//set a thin border
cs2.setBorderBottom(cs2.BORDER_THIN);
//fill w fg fill color
cs2.setFillPattern((short) HSSFCellStyle.SOLID_FOREGROUND);
//set the cell format to text see HSSFDataFormat for a full list
cs2.setDataFormat(HSSFDataFormat.getBuiltinFormat("text"));
// set the font
cs2.setFont(f2);
// set the sheet name in Unicode
wb.setSheetName(0, "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F " +
"\u0421\u0442\u0440\u0430\u043D\u0438\u0447\u043A\u0430",
HSSFWorkbook.ENCODING_UTF_16 );
// in case of compressed Unicode
// wb.setSheetName(0, "HSSF Test", HSSFWorkbook.ENCODING_COMPRESSED_UNICODE );
// create a sheet with 30 rows (0-29)
for (rownum = (short) 0; rownum < 30; rownum++)
{
// create a row
r = s.createRow(rownum);
// on every other row
if ((rownum % 2) == 0)
{
// make the row height bigger (in twips - 1/20 of a point)
r.setHeight((short) 0x249);
}
//r.setRowNum(( short ) rownum);
// create 10 cells (0-9) (the += 2 becomes apparent later
for (short cellnum = (short) 0; cellnum < 10; cellnum += 2)
{
// create a numeric cell
c = r.createCell(cellnum);
// do some goofy math to demonstrate decimals
c.setCellValue(rownum * 10000 + cellnum
+ (((double) rownum / 1000)
+ ((double) cellnum / 10000)));
String cellValue;
// create a string cell (see why += 2 in the
c = r.createCell((short) (cellnum + 1));
// on every other row
if ((rownum % 2) == 0)
{
// set this cell to the first cell style we defined
c.setCellStyle(cs);
// set the cell's string value to "Test"
c.setEncoding( HSSFCell.ENCODING_COMPRESSED_UNICODE );
c.setCellValue( "Test" );
}
else
{
c.setCellStyle(cs2);
// set the cell's string value to "\u0422\u0435\u0441\u0442"
c.setEncoding( HSSFCell.ENCODING_UTF_16 );
c.setCellValue( "\u0422\u0435\u0441\u0442" );
}
// make this column a bit wider
s.setColumnWidth((short) (cellnum + 1), (short) ((50 * 8) / ((double) 1 / 20)));
}
}
//draw a thick black border on the row at the bottom using BLANKS
// advance 2 rows
rownum++;
rownum++;
r = s.createRow(rownum);
// define the third style to be the default
// except with a thick black border at the bottom
cs3.setBorderBottom(cs3.BORDER_THICK);
//create 50 cells
for (short cellnum = (short) 0; cellnum < 50; cellnum++)
{
//create a blank type cell (no value)
c = r.createCell(cellnum);
// set it to the thick black border style
c.setCellStyle(cs3);
}
//end draw thick black border
// demonstrate adding/naming and deleting a sheet
// create a sheet, set its title then delete it
s = wb.createSheet();
wb.setSheetName(1, "DeletedSheet");
wb.removeSheetAt(1);
//end deleted sheet
// write the workbook to the output stream
// close our file (don't blow out our file handles
wb.write(out);
out.close();
]]></source>
</section>
<section title="Reading or modifying an existing file">
<p>Reading in a file is equally simple. To read in a file, create a
new instance of org.apache.poi.poifs.Filesystem, passing in an open InputStream, such as a FileInputStream
for your XLS, to the constructor. Construct a new instance of
org.apache.poi.hssf.usermodel.HSSFWorkbook passing the
Filesystem instance to the constructor. From there you have access to
all of the high level model objects through their assessor methods
(workbook.getSheet(sheetNum), sheet.getRow(rownum), etc).
</p>
<p>Modifying the file you have read in is simple. You retrieve the
object via an assessor method, remove it via a parent object's remove
method (sheet.removeRow(hssfrow)) and create objects just as you
would if creating a new xls. When you are done modifying cells just
call workbook.write(outputstream) just as you did above.</p>
<p>An example of this can be seen in
<link href="http://cvs.apache.org/viewcvs/~checkout~/jakarta-poi/src/java/org/apache/poi/hssf/dev/HSSF.java?rev=1.1">org.apache.poi.hssf.dev.HSSF</link>.</p>
</section>
</section>
<section title="Event API">
<p>The event API is brand new. It is intended for intermediate
developers who are willing to learn a little bit of the low level API
structures. Its relatively simple to use, but requires a basic
understanding of the parts of an Excel file (or willingness to
learn). The advantage provided is that you can read an XLS with a
relatively small memory footprint.
</p>
<p>To use this API you construct an instance of
org.apache.poi.hssf.eventmodel.HSSFRequest. Register a class you
create that supports the
org.apache.poi.hssf.eventmodel.HSSFListener interface using the
HSSFRequest.addListener(yourlistener, recordsid). The recordsid
should be a static reference number (such as BOFRecord.sid) contained
in the classes in org.apache.poi.hssf.record. The trick is you
have to know what these records are. Alternatively you can call
HSSFRequest.addListenerForAllRecords(mylistener). In order to learn
about these records you can either read all of the javadoc in the
org.apache.poi.hssf.record package or you can just hack up a
copy of org.apache.poi.hssf.dev.EFHSSF and adapt it to your
needs. TODO: better documentation on records.</p>
<p>Once you've registered your listeners in the HSSFRequest object
you can construct an instance of
org.apache.poi.poifs.filesystem.FileSystem (see POIFS howto) and
pass it your XLS file inputstream. You can either pass this, along
with the request you constructed, to an instance of HSSFEventFactory
via the HSSFEventFactory.processWorkbookEvents(request, Filesystem)
method, or you can get an instance of DocumentInputStream from
Filesystem.createDocumentInputStream(&quot;Workbook&quot;) and pass
it to HSSFEventFactory.processEvents(request, inputStream). Once you
make this call, the listeners that you constructed receive calls to
their processRecord(Record) methods with each Record they are
registered to listen for until the file has been completely read.
</p>
<p>A code excerpt from org.apache.poi.hssf.dev.EFHSSF (which is
in CVS or the source distribution) is reprinted below with excessive
comments:</p>
<source><![CDATA[
/**
* This example shows how to use the event API for reading a file.
*/
public class EventExample
implements HSSFListener
{
private SSTRecord sstrec;
/**
* This method listens for incoming records and handles them as required.
* @param record The record that was found while reading.
*/
public void processRecord(Record record)
{
switch (record.getSid())
{
// the BOFRecord can represent either the beginning of a sheet or the workbook
case BOFRecord.sid:
BOFRecord bof = (BOFRecord) record;
if (bof.getType() == bof.TYPE_WORKBOOK)
{
System.out.println("Encountered workbook");
// assigned to the class level member
} else if (bof.getType() == bof.TYPE_WORKSHEET)
{
System.out.println("Encountered sheet reference");
}
break;
case BoundSheetRecord.sid:
BoundSheetRecord bsr = (BoundSheetRecord) record;
System.out.println("New sheet named: " + bsr.getSheetname());
break;
case RowRecord.sid:
RowRecord rowrec = (RowRecord) record;
System.out.println("Row found, first column at "
+ rowrec.getFirstCol() + " last column at " + rowrec.getLastCol());
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
System.out.println("Cell found with value " + numrec.getValue()
+ " at row " + numrec.getRow() + " and column " + numrec.getColumn());
break;
// SSTRecords store a array of unique strings used in Excel.
case SSTRecord.sid:
sstrec = (SSTRecord) record;
for (int k = 0; k < sstrec.getNumUniqueStrings(); k++)
{
System.out.println("String table value " + k + " = " + sstrec.getString(k));
}
break;
case LabelSSTRecord.sid:
LabelSSTRecord lrec = (LabelSSTRecord) record;
System.out.println("String cell found with value "
+ sstrec.getString(lrec.getSSTIndex()));
break;
}
}
/**
* Read an excel file and spit out what we find.
*
* @param args Expect one argument that is the file to read.
* @throws IOException When there is an error processing the file.
*/
public static void main(String[] args) throws IOException
{
// create a new file input stream with the input file specified
// at the command line
FileInputStream fin = new FileInputStream(args[0]);
// create a new org.apache.poi.poifs.filesystem.Filesystem
POIFSFileSystem poifs = new POIFSFileSystem(fin);
// get the Workbook (excel part) stream in a InputStream
InputStream din = poifs.createDocumentInputStream("Workbook");
// construct out HSSFRequest object
HSSFRequest req = new HSSFRequest();
// lazy listen for ALL records with the listener shown above
req.addListenerForAllRecords(new EventExample());
// create our event factory
HSSFEventFactory factory = new HSSFEventFactory();
// process our events based on the document input stream
factory.processEvents(req, din);
// once all the events are processed close our file input stream
fin.close();
// and our document input stream (don't want to leak these!)
din.close();
System.out.println("done.");
}
}
]]></source>
</section>
<section title="Low Level APIs">
<p>The low level API is not much to look at. It consists of lots of
&quot;Records&quot; in the org.apache.poi.hssf.record.* package,
and set of helper classes in org.apache.poi.hssf.model.*. The
record classes are consistent with the low level binary structures
inside a BIFF8 file (which is embedded in a POIFS file system). You
probably need the book: &quot;Microsoft Excel 97 Developer's Kit&quot;
from Microsoft Press in order to understand how these fit together
(out of print but easily obtainable from Amazon's used books). In
order to gain a good understanding of how to use the low level APIs
should view the source in org.apache.poi.hssf.usermodel.* and
the classes in org.apache.poi.hssf.model.*. You should read the
documentation for the POIFS libraries as well.</p>
</section>
<section title="HSSF Class/Test Application">
<p>The HSSF application is nothing more than a test for the high
level API (and indirectly the low level support). The main body of
its code is repeated above. To run it:
</p>
<ul>
<li>download the poi-alpha build and untar it (tar xvzf
tarball.tar.gz)
</li>
<li>set up your classpath as follows:
<code>export HSSFDIR={wherever you put HSSF's jar files}
export LOG4JDIR={wherever you put LOG4J's jar files}
export CLASSPATH=$CLASSPATH:$HSSFDIR/hssf.jar:$HSSFDIR/poi-poifs.jar:$HSSFDIR/poi-util.jar:$LOG4JDIR/jog4j.jar</code>
</li><li>type:
<code>java org.apache.poi.hssf.dev.HSSF ~/myxls.xls write</code></li>
</ul>
<p></p>
<p>This should generate a test sheet in your home directory called <code>&quot;myxls.xls&quot;</code>. </p>
<ul>
<li>Type:
<code>java org.apache.poi.hssf.dev.HSSF ~/input.xls output.xls</code>
<br/>
<br/>
This is the read/write/modify test. It reads in the spreadsheet, modifies a cell, and writes it back out.
Failing this test is not necessarily a bad thing. If HSSF tries to modify a non-existant sheet then this will
most likely fail. No big deal. </li>
</ul>
</section>
<section title="Logging facility">
<p>Poi can dynamically select it's logging implementation. Poi trys to
create a logger using the System property named "org.apache.poi.util.POILogger".
Out of the box this can be set to one of three values:
</p>
<ul>
<li>org.apache.poi.util.CommonsLogger</li>
<li>org.apache.poi.util.NullLogger</li>
<li>org.apache.poi.util.SystemOutLogger</li>
</ul>
<p>
If the property is not defined or points to an invalid classthen the NullLogger is used.
</p>
<p>
Refer to the commons logging package level javadoc for more information concerning how to
<link href="http://jakarta.apache.org/commons/logging/api/index.html">configure commons logging.</link>
</p>
</section>
<section title="HSSF Developer's Tools">
<p>HSSF has a number of tools useful for developers to debug/develop
stuff using HSSF (and more generally XLS files). We've already
discussed the app for testing HSSF read/write/modify capabilities;
now we'll talk a bit about BiffViewer. Early on in the development of
HSSF, it was decided that knowing what was in a record, what was
wrong with it, etc. was virtually impossible with the available
tools. So we developed BiffViewer. You can find it at
org.apache.poi.hssf.dev.BiffViewer. It performs two basic
functions and a derivative.
</p>
<p>The first is &quot;biffview&quot;. To do this you run it (assumes
you have everything setup in your classpath and that you know what
you're doing enough to be thinking about this) with an xls file as a
parameter. It will give you a listing of all understood records with
their data and a list of not-yet-understood records with no data
(because it doesn't know how to interpret them). This listing is
useful for several things. First, you can look at the values and SEE
what is wrong in quasi-English. Second, you can send the output to a
file and compare it.
</p>
<p>The second function is &quot;big freakin dump&quot;, just pass a
file and a second argument matching &quot;bfd&quot; exactly. This
will just make a big hexdump of the file.
</p>
<p>Lastly, there is &quot;mixed&quot; mode which does the same as
regular biffview, only it includes hex dumps of certain records
intertwined. To use that just pass a file with a second argument
matching &quot;on&quot; exactly.</p>
<p>In the next release cycle we'll also have something called a
FormulaViewer. The class is already there, but its not very useful
yet. When it does something, we'll document it.</p>
</section>
<section title="What's Next?">
<p>This release contains code that supports &quot;internationalization&quot;
or more accurately non-US/UK languages; however, it has not been
tested with the new API changes (please help us with this). We've
shifted focus a bit for this release in recognition of the
international support we've gotten. We're going to focus on western
European languages for our first beta. We're more than happy to
accept help in supporting non-Western European languages if someone
who knows what they're doing in this area is willing to pitch in!
(There is next to no documentation on what is necessary to support
such a move and its really hard to support a language when you don't even
know the alphabet).</p>
<p>This release of HSSF does not yet support Formulas. I've been
focusing on the requests I've gotten in. That being said, if we get
more user feedback on what is most useful first we'll aim for that.
As a general principal, HSSF's goal is to support HSSF-Serializer
(meaning an emphasis on write). We would like to hear from you! How
are you using HSSF/POIFS? How would you like to use it? What features
are most important first?
</p>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Overview">
<p>HSSF is the POI Project's pure Java implementation of the Excel '97(-2002) file format.</p>
<p>HSSF provides a way to read spreadsheets create, modify, read and write XLS spreadsheets
It provides:
</p>
<ul>
<li>low level structures for those with special needs</li>
<li>an eventmodel api for efficient read-only access</li>
<li>a full usermodel api for creating, reading and modifying XLS files</li>
</ul>
<p>
Truth be told there is probably a better way to generate your spreadsheet
generation (yet you'll still be using HSSF indirectly). At the time of
this writing we're in the process of moving the HSSF Serializer over to
the <link href="http://xml.apache.org/cocoon">Apache Cocoon
Project</link>. With Cocoon you can serialize any XML datasource (of
which might be a ESQL page outputting in SQL for instance) by simply
applying the stylesheet and designating the serializer.
</p>
<p>
If you're merely reading spreadsheet data, then use the eventmodel api
in the org.apache.poi.hssf.eventmodel package.
</p>
<p>
If you're modifying spreadsheet data then use the usermodel api. You
can also generate spreadsheets this way, but using Cocoon (which will do
it this way indirectly) is the best way...we promise.
</p>
</section>
</body>
</document>

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<document>
<header>
<title>Limitations</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
</authors>
</header>
<body>
<section title="Version 1.5 limitations">
<p>
The intent of this document is to outline some of the known limitations of the
POI HSSF API's. It is not intended to be complete list of every bug or missing
feature of HSSF, rather it's purpose is to provide a broad feel for some of the
functionality that is missing or broken.
</p>
<ul>
<li>
Charts<br/><br/>
You can not currently create charts. This is planned for the 2.0 release. You can
however create a chart in Excel, modify the chart data values using HSSF and write
a new spreadsheet out. This is possible because POI attempts to keep existing records
intact as far as possible.<br/><br/>
</li>
<li>
Rich Text<br/><br/>
HSSF does not support rich text cells. Rich text cells are
cells that have multiple fonts and styles in the once cell. Any attempt to read
a spreadsheet that has rich text cells will throw an exception. This feature may
be supported in the future but it is not currently planned. Patches are welcome.<br/><br/>
</li>
<li>
Outlines<br/><br/>
It is not yet possible to create outlines. Reading a spreadsheet with outlines
may work correctly but has not been tested. Write support for outlines may
be added in the future but it is not currently planned. Patches are welcome.<br/><br/>
</li>
<li>
Macros<br/><br/>
Macros can not be created. The are currently no plans to support macros. Reading
workbooks containing macros is supported but attempting to write those workbooks
will fail. This is because macros are stored as extra file sytems within the
compound document, and these are not currently kept when the file is rewritten.<br/><br/>
</li>
<li>
Pivot Tables<br/><br/>
Generating pivot tables is not supported. Reading spreadsheets containing pivot tables
has not been tested.
</li>
</ul>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Busy Developers' Guide to HSSF Features</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="CO"/>
</authors>
</header>
<body>
<section title="Busy Developers' Guide to Features">
<p>
Want to use HSSF read and write spreadsheets in a hurry? This guide is for you. If you're after
more in-depth coverage of the HSSF user-API please consult the <link href="how-to.html">HOWTO</link>
guide as it contains actual descriptions of how to use this stuff.
</p>
<section title="Index of Features">
<ul>
<li><link href="#NewWorkbook">How to create a new workbook</link></li>
<li><link href="#NewSheet">How to create a sheet</link></li>
<li><link href="#CreateCells">How to create cells</link></li>
<li><link href="#CreateDateCells">How to create date cells</link></li>
<li><link href="#CellTypes">Working with different types of cells</link></li>
<li><link href="#Alignment">Aligning cells</link></li>
<li><link href="#Borders">Working with borders</link></li>
<li><link href="#FrillsAndFills">Fills and color</link></li>
<li><link href="#MergedCells">Merging cells</link></li>
<li><link href="#WorkingWithFonts">Working with fonts</link></li>
<li><link href="#CustomColors">Custom colors</link></li>
<li><link href="#ReadWriteWorkbook">Reading and writing</link></li>
<li><link href="#NewLinesInCells">Use newlines in cells.</link></li>
<li><link href="#DataFormats">Create user defined data formats.</link></li>
<li><link href="#PrintArea">Fit sheet to one page</link></li>
<li><link href="#PrintArea2">Set print area for a sheet.</link></li>
<li><link href="#FooterPageNumbers">Set page numbers on the footer of a sheet.</link></li>
<li><link href="#ShiftRows">Shift rows.</link></li>
<li><link href="#SelectSheet">Set a sheet as selected.</link></li>
<li><link href="#Zoom">Set the zoom magnification for a sheet.</link></li>
<li><link href="#Splits">Create split and freeze panes.</link></li>
<li><link href="#Repeating">Repeating rows and columns.</link></li>
<li><link href="#HeaderFooter">Headers and Footers.</link></li>
</ul>
</section>
<section title="Features">
<anchor id="NewWorkbook"/>
<section title="New Workbook">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="NewSheet"/>
<section title="New Sheet">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
HSSFSheet sheet2 = wb.createSheet("second sheet");
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CreateCells"/>
<section title="Creating Cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short)0);
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short)0);
cell.setCellValue(1);
// Or do it on one line.
row.createCell((short)1).setCellValue(1.2);
row.createCell((short)2).setCellValue("This is a string");
row.createCell((short)3).setCellValue(true);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CreateDateCells"/>
<section title="Creating Date Cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short)0);
// Create a cell and put a date value in it. The first cell is not styled
// as a date.
HSSFCell cell = row.createCell((short)0);
cell.setCellValue(new Date());
// we style the second cell as a date (and time). It is important to
// create a new cell style from the workbook otherwise you can end up
// modifying the built in style and effecting not only this cell but other cells.
HSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setDataFormat(HSSFDataFormat.getFormat("m/d/yy h:mm"));
cell = row.createCell((short)1);
cell.setCellValue(new Date());
cell.setCellStyle(cellStyle);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CellTypes"/>
<section title="Working with different types of cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = sheet.createRow((short)2);
row.createCell((short) 0).setCellValue(1.1);
row.createCell((short) 1).setCellValue(new Date());
row.createCell((short) 2).setCellValue("a string");
row.createCell((short) 3).setCellValue(true);
row.createCell((short) 4).setCellType(HSSFCell.CELL_TYPE_ERROR);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="Alignment"/>
<section title="Demonstrates various alignment options">
<source>
public static void main(String[] args)
throws IOException
{
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = sheet.createRow((short) 2);
createCell(wb, row, (short) 0, HSSFCellStyle.ALIGN_CENTER);
createCell(wb, row, (short) 1, HSSFCellStyle.ALIGN_CENTER_SELECTION);
createCell(wb, row, (short) 2, HSSFCellStyle.ALIGN_FILL);
createCell(wb, row, (short) 3, HSSFCellStyle.ALIGN_GENERAL);
createCell(wb, row, (short) 4, HSSFCellStyle.ALIGN_JUSTIFY);
createCell(wb, row, (short) 5, HSSFCellStyle.ALIGN_LEFT);
createCell(wb, row, (short) 6, HSSFCellStyle.ALIGN_RIGHT);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
}
/**
* Creates a cell and aligns it a certain way.
*
* @param wb the workbook
* @param row the row to create the cell in
* @param column the column number to create the cell in
* @param align the alignment for the cell.
*/
private static void createCell(HSSFWorkbook wb, HSSFRow row, short column, short align)
{
HSSFCell cell = row.createCell(column);
cell.setCellValue("Align It");
HSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(align);
cell.setCellStyle(cellStyle);
}
</source>
</section>
<anchor id="Borders"/>
<section title="Working with borders">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short) 1);
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue(4);
// Style the cell with borders all around.
HSSFCellStyle style = wb.createCellStyle();
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBottomBorderColor(HSSFColor.BLACK.index);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setLeftBorderColor(HSSFColor.GREEN.index);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setRightBorderColor(HSSFColor.BLUE.index);
style.setBorderTop(HSSFCellStyle.BORDER_MEDIUM_DASHED);
style.setTopBorderColor(HSSFColor.BLACK.index);
cell.setCellStyle(style);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="FillsAndFrills"/>
<section title="Fills and colors">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short) 1);
// Aqua background
HSSFCellStyle style = wb.createCellStyle();
style.setFillBackgroundColor(HSSFColor.AQUA.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("X");
cell.setCellStyle(style);
// Orange "foreground", foreground being the fill foreground not the font color.
style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.ORANGE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cell = row.createCell((short) 2);
cell.setCellValue("X");
cell.setCellStyle(style);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="MergedCells"/>
<section title="Merging cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = sheet.createRow((short) 1);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("This is a test of merging");
sheet.addMergedRegion(new Region(1,(short)1,1,(short)2));
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="WorkingWithFonts"/>
<section title="Working with fonts">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short) 1);
// Create a new font and alter it.
HSSFFont font = wb.createFont();
font.setFontHeightInPoints((short)24);
font.setFontName("Courier New");
font.setItalic(true);
font.setStrikeout(true);
// Fonts are set into a style so create a new one to use.
HSSFCellStyle style = wb.createCellStyle();
style.setFont(font);
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("This is a test of fonts");
cell.setCellStyle(style);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CustomColors"/>
<section title="Custom colors">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
HSSFRow row = sheet.createRow((short) 0);
HSSFCell cell = row.createCell((short) 0);
cell.setCellValue("Default Palette");
//apply some colors from the standard palette,
// as in the previous examples.
//we'll use red text on a lime background
HSSFCellStyle style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.LIME.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
HSSFFont font = wb.createFont();
font.setColor(HSSFColor.RED.index);
style.setFont(font);
cell.setCellStyle(style);
//save with the default palette
FileOutputStream out = new FileOutputStream("default_palette.xls");
wb.write(out);
out.close();
//now, let's replace RED and LIME in the palette
// with a more attractive combination
// (lovingly borrowed from freebsd.org)
cell.setCellValue("Modified Palette");
//creating a custom palette for the workbook
HSSFPalette palette = wb.getCustomPalette();
//replacing the standard red with freebsd.org red
palette.setColorAtIndex(HSSFColor.RED.index,
(byte) 153, //RGB red (0-255)
(byte) 0, //RGB green
(byte) 0 //RGB blue
);
//replacing lime with freebsd.org gold
palette.setColorAtIndex(HSSFColor.LIME.index, (byte) 255, (byte) 204, (byte) 102);
//save with the modified palette
// note that wherever we have previously used RED or LIME, the
// new colors magically appear
out = new FileOutputStream("modified_palette.xls");
wb.write(out);
out.close();
</source>
</section>
<anchor id="ReadWriteWorkbook"/>
<section title="Reading and Rewriting Workbooks">
<source>
POIFSFileSystem fs =
new POIFSFileSystem(new FileInputStream("workbook.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(2);
HSSFCell cell = row.getCell((short)3);
if (cell == null)
cell = row.createCell((short)3);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue("a test");
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="NewLinesInCells"/>
<section title="Using newlines in cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
HSSFRow r = null;
HSSFCell c = null;
HSSFCellStyle cs = wb.createCellStyle();
HSSFFont f = wb.createFont();
HSSFFont f2 = wb.createFont();
cs = wb.createCellStyle();
cs.setFont( f2 );
//Word Wrap MUST be turned on
cs.setWrapText( true );
r = s.createRow( (short) 2 );
r.setHeight( (short) 0x349 );
c = r.createCell( (short) 2 );
c.setCellType( HSSFCell.CELL_TYPE_STRING );
c.setCellValue( "Use \n with word wrap on to create a new line" );
c.setCellStyle( cs );
s.setColumnWidth( (short) 2, (short) ( ( 50 * 8 ) / ( (double) 1 / 20 ) ) );
FileOutputStream fileOut = new FileOutputStream( "workbook.xls" );
wb.write( fileOut );
fileOut.close();</source>
</section>
<anchor id="DataFormats"/>
<section title="Data Formats">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFCellStyle style;
HSSFDataFormat format = wb.createDataFormat();
HSSFRow row;
HSSFCell cell;
short rowNum = 0;
short colNum = 0;
row = sheet.createRow(rowNum++);
cell = row.createCell(colNum);
cell.setCellValue(11111.25);
style = wb.createCellStyle();
style.setDataFormat(format.getFormat("0.0"));
cell.setCellStyle(style);
row = sheet.createRow(rowNum++);
cell = row.createCell(colNum);
cell.setCellValue(11111.25);
style = wb.createCellStyle();
style.setDataFormat(format.getFormat("#,##0.0000"));
cell.setCellStyle(style);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="PrintArea"/>
<section title="Set Print Area to One Page">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFPrintSetup ps = sheet.getPrintSetup()
sheet.setAutobreaks(true)
ps.setFitHeight((short)1);
ps.setFitWidth((short)1);
// Create various cells and rows for spreadsheet.
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="PrintArea2"/>
<section title="Set Print Area">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("Sheet1");
wb.setPrintArea(0, "$A$1:$C$2");
//sets the print area for the first sheet
//Alternatively:
//wb.setPrintArea(0, 0, 1, 0, 0) is equivalent to using the name reference (See the JavaDocs for more details)
// Create various cells and rows for spreadsheet.
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="FooterPageNumbers"/>
<section title="Set Page Numbers on Footer">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFFooter footer = sheet.getFooter()
footer.setRight( "Page " + HSSFFooter.page() + " of " + HSSFFooter.numPages() );
// Create various cells and rows for spreadsheet.
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="Convenience Functions"/>
<section title="Using the Convenience Functions">
<p>
The convenience functions live in contrib and provide
utility features such as setting borders around merged
regions and changing style attributes without explicitly
creating new styles.
</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet( "new sheet" );
// Create a merged region
HSSFRow row = sheet1.createRow( (short) 1 );
HSSFRow row2 = sheet1.createRow( (short) 2 );
HSSFCell cell = row.createCell( (short) 1 );
cell.setCellValue( "This is a test of merging" );
Region region = new Region( 1, (short) 1, 4, (short) 4 );
sheet1.addMergedRegion( region );
// Set the border and border colors.
final short borderMediumDashed = HSSFCellStyle.BORDER_MEDIUM_DASHED;
HSSFRegionUtil.setBorderBottom( borderMediumDashed,
region, sheet1, wb );
HSSFRegionUtil.setBorderTop( borderMediumDashed,
region, sheet1, wb );
HSSFRegionUtil.setBorderLeft( borderMediumDashed,
region, sheet1, wb );
HSSFRegionUtil.setBorderRight( borderMediumDashed,
region, sheet1, wb );
HSSFRegionUtil.setBottomBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
HSSFRegionUtil.setTopBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
HSSFRegionUtil.setLeftBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
HSSFRegionUtil.setRightBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
// Shows some usages of HSSFCellUtil
HSSFCellStyle style = wb.createCellStyle();
style.setIndention((short)4);
HSSFCellUtil.createCell(row, 8, "This is the value of the cell", style);
HSSFCell cell2 = HSSFCellUtil.createCell( row2, 8, "This is the value of the cell");
HSSFCellUtil.setAlignment(cell2, wb, HSSFCellStyle.ALIGN_CENTER);
// Write out the workbook
FileOutputStream fileOut = new FileOutputStream( "workbook.xls" );
wb.write( fileOut );
fileOut.close();
</source>
</section>
<anchor id="ShiftRows"/>
<section title="Shift rows up or down on a sheet">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("row sheet");
// Create various cells and rows for spreadsheet.
// Shift rows 6 - 11 on the spreadsheet to the top (rows 0 - 5)
sheet.shiftRows(5, 10, -5);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="SelectSheet"/>
<section title="Set a sheet as selected">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("row sheet");
sheet.setSelected(true);
// Create various cells and rows for spreadsheet.
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="Zoom"/>
<section title="Set the zoom magnification">
<p>
The zoom is expressed as a fraction. For example to
express a zoom of 75% use 3 for the numerator and
4 for the denominator.
</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
sheet1.setZoom(3,4); // 75 percent magnification
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="Splits"/>
<section title="Splits and freeze panes">
<p>
There are two types of panes you can create; freeze panes and split panes.
</p>
<p>
A freeze pane is split by columns and rows. You create
a freeze pane using the following mechanism:
</p>
<p>
sheet1.createFreezePane( 3, 2, 3, 2 );
</p>
<p>
The first two parameters are the columns and rows you
wish to split by. The second two parameters indicate
the cells that are visible in the bottom right quadrant.
</p>
<p>
Split pains appear differently. The split area is
divided into four separate work area's. The split
occurs at the pixel level and the user is able to
adjust the split by dragging it to a new position.
</p>
<p>
Split panes are created with the following call:
</p>
<p>
sheet2.createSplitPane( 2000, 2000, 0, 0, HSSFSheet.PANE_LOWER_LEFT );
</p>
<p>
The first parameter is the x position of the split.
This is in 1/20th of a point. A point in this case
seems to equate to a pixel. The second parameter is
the y position of the split. Again in 1/20th of a point.
</p>
<p>
The last parameter indicates which pane currently has
the focus. This will be one of HSSFSheet.PANE_LOWER_LEFT,
PANE_LOWER_RIGHT, PANE_UPPER_RIGHT or PANE_UPPER_LEFT.
</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
HSSFSheet sheet2 = wb.createSheet("second sheet");
HSSFSheet sheet3 = wb.createSheet("third sheet");
HSSFSheet sheet4 = wb.createSheet("fourth sheet");
// Freeze just one row
sheet1.createFreezePane( 0, 1, 0, 1 );
// Freeze just one column
sheet2.createFreezePane( 1, 0, 1, 0 );
// Freeze the columns and rows (forget about scrolling position of the lower right quadrant).
sheet3.createFreezePane( 2, 2 );
// Create a split with the lower left side being the active quadrant
sheet4.createSplitPane( 2000, 2000, 0, 0, HSSFSheet.PANE_LOWER_LEFT );
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="Repeating"/>
<section title="Repeating rows and columns">
<p>
It's possible to set up repeating rows and columns in
your printouts by using the setRepeatingRowsAndColumns()
function in the HSSFWorkbook class.
</p>
<p>
This function Contains 5 parameters.
The first parameter is the index to the sheet (0 = first sheet).
The second and third parameters specify the range for the columns to repreat.
To stop the columns from repeating pass in -1 as the start and end column.
The fourth and fifth parameters specify the range for the rows to repeat.
To stop the columns from repeating pass in -1 as the start and end rows.
</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
HSSFSheet sheet2 = wb.createSheet("second sheet");
// Set the columns to repeat from column 0 to 2 on the first sheet
wb.setRepeatingRowsAndColumns(0,0,2,-1,-1);
// Set the the repeating rows and columns on the second sheet.
wb.setRepeatingRowsAndColumns(1,4,5,1,2);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="HeaderFooter"/>
<section title="Headers and Footers">
<p>
Example is for headers but applies directly to footers.
</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFHeader header = sheet.getHeader();
header.setCenter("Center Header");
header.setLeft("Left Header");
header.setRight(HSSFHeader.font("Stencil-Normal", "Italic") +
HSSFHeader.fontSize((short) 16) + "Right w/ Stencil-Normal Italic font and size 16");
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!-- <!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd"> -->
<document>
<header>
<title>Record Generator HOWTO</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="glens"/>
<person email="acoliver@apache.org" name="Andrew C. Oliver" id="acoliver"/>
</authors>
</header>
<body>
<section title="How to Use the Record Generator">
<section title="History">
<p>
The record generator was born from frustration with translating
the Excel records to Java classes. Doing this manually is a time
consuming process. It's also very easy to make mistakes.
</p>
<p>
A utility was needed to take the defintition of what a
record looked like and do all the boring and repetitive work.
</p>
</section>
<section title="Capabilities">
<p>
The record generator takes XML as input and produces the following
output:
<ul>
<li>A Java file capabile of decoding and encoding the record.</li>
<li>A test class that provides a fill-in-the-blanks implementation
of a test case for ensuring the record operates as
designed.</li>
</ul>
</p>
</section>
<section title="Usage">
<p>
The record generator is invoked as an Ant target
(generate-records). It goes through looking for all files in
<code>src/records/defintitions</code> ending with _record.xml.
It then creates two files; the Java record definition and the
Java test case template.
</p>
<p>
The records themselves have the following general layout:
</p>
<source><![CDATA[
<record id="0x1032" name="Frame" package="org.apache.poi.hssf.record"
excel-record-id="FRAME">
<description>The frame record indicates whether there is a border
around the displayed text of a chart.</description>
<author>Glen Stampoultzis (glens at apache.org)</author>
<fields>
<field type="int" size="2" name="border type">
<const name="regular" value="0" description="regular rectangle or no border"/>
<const name="shadow" value="1" description="rectangle with shadow"/>
</field>
<field type="int" size="2" name="options">
<bit number="0" name="auto size"
description="excel calculates the size automatically if true"/>
<bit number="1" name="auto position"
description="excel calculates the position automatically"/>
</field>
</fields>
</record>
]]></source>
<p>
The following table details the allowable types and sizes for
the fields.
</p>
<table>
<tr>
<th>Type</th>
<th>Size</th>
<th>Java Type</th>
</tr>
<tr>
<td>int</td>
<td>1</td>
<td>byte</td>
</tr>
<tr>
<td>int</td>
<td>2</td>
<td>short</td>
</tr>
<tr>
<td>int</td>
<td>4</td>
<td>int</td>
</tr>
<tr>
<td>int</td>
<td>8</td>
<td>long</td>
</tr>
<tr>
<td>int</td>
<td>varword</td>
<td>array of shorts</td>
</tr>
<tr>
<td>bits</td>
<td>1</td>
<td>A byte comprising of a bits (defined by the bit element)
</td>
</tr>
<tr>
<td>bits</td>
<td>2</td>
<td>An short comprising of a bits</td>
</tr>
<tr>
<td>bits</td>
<td>4</td>
<td>A int comprising of a bits</td>
</tr>
<tr>
<td>float</td>
<td>8</td>
<td>double</td>
</tr>
<tr>
<td>hbstring</td>
<td>java expression</td>
<td>String</td>
</tr>
</table>
<p>
The Java records are regenerated each time the record generator is
run, however the test stubs are only created if the test stub does
not already exist. What this means is that you may change test
stubs but not the generated records.
</p>
</section>
<section title="Custom Field Types">
<p>
Occationally the builtin types are not enough. More control
over the encoding and decoding of the streams is required. This
can be achieved using a custom type.
</p>
<p>
A custom type lets you escape to java to define the way in which
the field encodes and decodes. To code a custom type you
declare your field like this:
</p>
<source><![CDATA[
<field type="custom:org.apache.poi.hssf.record.LinkedDataFormulaField"
size="var" name="formula of link" description="formula"/>
]]></source>
<p>
Where the class name specified after <code>custom:</code> is a
class implementing the interface <code>CustomField</code>.
</p>
<p>
You can then implement the encoding yourself.
</p>
</section>
<section title="How it Works">
<p>
The record generation works by taking an XML file and styling it
using XLST. Given that XSLT is a little limited in some ways it was
necessary to add a little Java code to the mix.
</p>
<p>
See record.xsl, record_test.xsl, FieldIterator.java,
RecordUtil.java, RecordGenerator.java
</p>
<p>
There is a corresponding &quot;type&quot; generator for HDF.
See the HDF documentation for details.
</p>
</section>
<section title="Limitations">
<p>
The record generator does not handle all possible record types and
goes not intend to perform this function. When dealing with a
non-standard record sometimes the cost-benifit of coding the
record by hand will be greater than attempting modify the
generator. The main point of the record generator is to save
time, so keep that in mind.
</p>
<p>
Currently the the XSL file that generates the record calls out to
Java objects. The Java code for the record generation is
currently quite messy with minimal comments.
</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF Use Cases</title>
<authors>
<person email="marc.johnson@yahoo.com" name="Marc Johnson" id="MJ"/>
</authors>
</header>
<body>
<section title="HSSF Use Cases">
<section title="Use Case 1: Read existing HSSF">
<p><strong>Primary Actor:</strong> HSSF client</p>
<p><strong>Scope:</strong> HSSF</p>
<p><strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF client- wants to read content
of HSSF file</li>
<li>HSSF - understands HSSF file</li>
<li>POIFS - understands underlying POI
file system</li>
</ul>
<p><strong>Precondition:</strong> None</p>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF client requests HSSF to read
a HSSF file, providing an InputStream
containing HSSF file in question.</li>
<li>HSSF requests POIFS to read the HSSF
file, passing the InputStream
object to POIFS (POIFS use case 1, read existing file system)</li>
<li>HSSF reads the &quot;Workbook&quot;
file (use case 4, read workbook entry)</li>
</ol>
<p><strong>Extensions:</strong></p>
<p>2a. Exceptions
thrown by POIFS will be passed on to the HSSF client.</p>
</section>
<section title="Use Case 2: Write HSSF file">
<p><strong>Primary Actor:</strong> HSSF client</p>
<p><strong>Scope:</strong> HSSF</p>
<p><strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF client- wants to write file
out.</li>
<li>HSSF - knows how to write file
out.</li>
<li>POIFS - knows how to write file
system out.</li>
</ul>
<p><strong>Precondition:</strong></p>
<ul>
<li>File has been
read (use case 1, read existing HSSF file) and subsequently modified
or file has been created (use case 3, create HSSF file)</li>
</ul>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF client
provides an OutputStream to
write the file to.</li>
<li>HSSF writes
the &quot;Workbook&quot; to its associated POIFS file system (use case
5, write workbook entry)</li>
<li>HSSF
requests POIFS to write its file system out, using the OutputStream
obtained from the HSSF client (POIFS use case 2, write file system).</li>
</ol>
<p><strong>Extensions:</strong></p>
<p>3a. Exceptions
from POIFS are passed to the HSSF client.</p>
</section>
<section title="Use Case 3:Create HSSF file">
<p><strong>Primary Actor:</strong> HSSF client</p>
<p><strong>Scope:</strong> HSSF</p>
<p>
<strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF client- wants to create a new
file.</li>
<li>HSSF - knows how to create a new
file.</li>
<li>POIFS - knows how to creat a new
file system.</li>
</ul>
<p><strong>Precondition:</strong></p>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF requests
POIFS to create a new file system (POIFS use case 3, create new file
system)</li>
</ol>
<p><strong>Extensions:</strong>
None</p>
</section>
<section title="Use Case 4: Read workbook entry">
<p><strong>Primary Actor:</strong> HSSF</p>
<p><strong>Scope:</strong> HSSF</p>
<p>
<strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF - knows how to read the
workbook entry</li>
<li>POIFS - knows how to manage the file
system.</li>
</ul>
<p><strong>Precondition:</strong></p>
<ul>
<li>The file
system has been read (use case 1, read existing HSSF file) or has
been created and written to (use case 3, create HSSF file system;
use case 5, write workbook entry).</li>
</ul>
<p><strong>Minimal
Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>
HSSF requests POIFS for the &quot;Workbook&quot; file</li>
<li>POIFS returns
an InputStream for the file.</li>
<li>HSSF reads
from the InputStream provided by POIFS</li>
<li>HSSF closes
the InputStream provided by POIFS</li>
</ol>
<p><strong>Extensions:</strong></p>
<p>3a. Exceptions
thrown by POIFS will be passed on</p>
</section>
<section title="Use Case 5: Write workbook entry">
<p><strong>Primary Actor:</strong> HSSF</p>
<p><strong>Scope:</strong> HSSF</p>
<p>
<strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF - knows how to manage the
write the workbook entry.</li>
<li>POIFS - knows how to manage the file
system.</li>
</ul>
<p><strong>Precondition:</strong>
</p>
<ul>
<li>Either an existing HSSF file has
been read (use case 1, read existing HSSF file) or an HSSF file has
been created (use case 3, create HSSF file).</li>
</ul>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF
checks the POIFS file system directory for the &quot;Workbook&quot;
file (POIFS use case 8, read file system directory)</li>
<li>If &quot;Workbook&quot; is in the directory, HSSF requests POIFS to
replace it with the new workbook entry (POIFS use case 4, replace file
in file system). Otherwise, HSSF requests POIFS to write the new
workbook file, with the name &quot;Workbook&quot; (POIFS use case 6,
write new file to file system)</li>
</ol>
<p><strong>Extensions:</strong>None</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Welcome to POI</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="GJS" name="Glen Stampoultzis" email="glens@apache.org"/>
</authors>
</header>
<body>
<section title="News">
<section title="Get your POI news here">
<p>
You can now read your POI news in a handy dandy
<a href="http://nagoya.apache.org/poi/news/?flavor=rss">RSS feed</a> or read it <a href="http://nagoya.apache.org/poi/news/">here</a> (links to
other syndication formats there as well). Thanks to the good guys of the
<a href="http://blojsom.sourceforge.net">Blojsom</a> project for writing such
a great piece of software! Subscribe using your favorite aggregator today and
stay current on important POI news and events such as releases, new development
features, etc.
</p>
</section>
<section title="Latest Development Release">
<p>
The latest development release of POI is version 1.10.
Binary distributions are available <link href="http://jakarta.apache.org/builds/jakarta-poi/dev/bin/">here</link>
and source distributions are <link href="http://jakarta.apache.org/builds/jakarta-poi/dev/src/">here</link>.
</p>
<!-- <p>-->
<!-- <link href="http://vote.sparklit.com/poll.spark/640946">Click here</link> to see the current results.-->
<!-- </p>-->
</section>
<section title="Translations">
<p>
The POI documentation translation project has begun. The first ones
to start are the <link href="trans/es/index.html">Spanish
(espaniol)</link> and <link href="http://www.terra-intl.com/jakarta/poi/">Japanese</link>, and
<link href="trans/de/index.html">German</link>
translations. Others are welcome. Please feel
free to participate!
</p>
</section>
<section title="Logo Contest">
<p>
Voting for the POI logo contest is now complete. Thank you for your votes.
</p>
<!-- <p>-->
<!-- <link href="http://vote.sparklit.com/poll.spark/640946">Click here</link> to see the current results.-->
<!-- </p>-->
</section>
</section>
<section title="Purpose">
<p>
The POI project consists of APIs for manipulating various file formats
based upon Microsoft's OLE 2 Compound Document format using pure Java.
</p>
<p>
OLE 2 Compound Document Format based files include most Microsoft Office
files such as XLS and DOC.
</p>
<p>
As a general policy we try to collaborate as much as possible with other projects to
provide this functionality. Examples include: <link href="http://xml.apache.org/cocoon">Cocoon</link> for
which you'll soon find generators and serializers for our projects;
<link href="http://www.openoffice.org">Open Office.org</link> with whom we collaborate in documenting the
XLS format; and <link href="http://jakarta.apache.org/lucene">Lucene</link> for which we'll soon have file
format interpretors. When practical, we donate components directly to those projects for POI-enabling them.
</p>
<section title="Why/when would I use POI?">
<p>
We'll tackle this on a component level. POI refers to the whole project.
</p>
<p>
So why should you use POIFS or HSSF?
</p>
<p>
You'd use POIFS if you had a document written in OLE 2 Compound Document Format, probably written using
MFC, that you needed to read in Java. Alternatively, you'd use POI to write OLE 2 Compound Document Format
if you needed to inter-operate with software running on the Windows platform. We are not just bragging when
we say that POIFS is the most complete and correct port of this file format to date!
</p>
<p>
You'd use HSSF if you needed to read or write an XLS (Excel) file using Java. You can also read and modify
spreadsheets using this API, although right now writing is more mature.
</p>
</section>
<section title="What does POI stand for?">
<p>
POI stands for Poor Obfuscation Implementation. Why would we name our project such a derogatory name? Well,
Microsoft's OLE 2 Compound Document Format is a poorly conceived thing. It is essentially an archive structured
much like the old DOS FAT filesystem. Redmond chose, instead of using tar, gzip, zip or arc, to invent their own
archive format that does not provide any standard encryption or compression, is not very appendable and is prone
to fragmentation.
</p>
<p>
Poi is also a Hawaiian delicacy that <link href="http://www.m-w.com">Merriam Webster's dictionary</link> defines as:
"A Hawaiian food of taro root cooked, pounded, and kneaded to a paste and often allowed to ferment." This seemed
strangely descriptive of the file format.
</p>
<p>
So if you like acronyms, then POI is an acronym. If you hate them, then we just used the name of the food for our
project. If you wish to signify your love or hate for acronyms, use POI or Poi to refer to the project respectively.
</p>
</section>
</section>
<section title="Components To Date">
<section title="Overview">
<p>A common misconception is that POI writes Excel files. POI is the name of the project. POI contains several
components, one of which, HSSF, writes Excel files. The following are components of the entire POI project
and a brief summary of their purpose.</p>
</section>
<section title="POIFS (POI Filesystem)">
<p>POIFS is the oldest and most stable part of the project. It is our port of the OLE 2 Compound Document Format to
pure Java. It supports both read and write functionality. All of our components ultimately rely on it by
definition. Please see <link href="./poifs/index.html">the POIFS project page</link> for more information.</p>
</section>
<section title="HSSF (Horrible Spreadsheet Format)">
<p>HSSF is our port of the Microsoft Excel 97(-2002) file format (BIFF8) to pure Java. It supports read and write
capability. Please see <link href="./hssf/index.html">the HSSF project page</link> for more information.</p>
</section>
<section title="HDF (Horrible Document Format)">
<p>HDF is our port of the Microsoft Word 97 file format to pure Java. It supports read and write capability.
Please see <link href="./hdf/index.html">the HDF project page for more information</link>. This component is
in the early stages of design. Jump in!</p>
</section>
<section title="HPSF (Horrible Property Set Format)">
<p>HPSF is our port of the OLE 2 property set format to pure
Java. Property sets are mostly use to store a document's properties
(title, author, date of last modification etc.), but they can be used
for application-specific purposes as well. Currently HPSF supports
read functionality only. Please see <link
href="./hpsf/index.html">the HPSF project page</link> for more
information.</p>
</section>
</section>
<section title="What happened to the HSSF Serializer?">
<p>The HSSF Serializer, which was part of our 1.0 release and last builds on
<link href="http://www.sourceforge.net/projects/poi">Sourceforge</link>, has been donated to the
<link href="http://xml.apache.org/cocoon/">Cocoon</link> project, and is available starting from version
2.0.2.</p>
</section>
<section title="Contributing ">
<p>
So you'd like to contribute to the project? Great! We need enthusiastic, hard-working, talented folks to help
us on the project in several areas. The first is bug reports and feature requests! The second is documentation -
we'll be at your every beck and call if you've got a critique or you'd like to contribute or otherwise improve
the documentation. We could especially use some help documenting the HSSF file format! Last, but not least, we
could use some binary crunching Java coders to chew through the convolution that characterizes Microsoft's file
formats and help us port new ones to a superior Java platform!
</p>
<p>So if you're motivated, ready, and have the time, join the mail lists and we'll be happy to help you get started on the
project!
</p>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title></title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="Mirrors">
<p>
These are mirrors of the
<link href="http://jakarta.apache.org/poi">POI</link> website.
If you know of others...report them! :-)
</p>
</section>
<section title="Austria">
<ul>
<li><link href="http://gd.tuwien.ac.at/infosys/servers/http/apache-jakarta-site/poi/index.html">Austrian Mirror of Jakarta POI</link></li>
</ul>
</section>
<section title="Korea">
<ul>
<li><link href="http://jakarta.ktech21.co.kr/">Jakarta site partially translated into Korean and Mirrored</link></li>
</ul>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title></title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="POI in the news">
<p>
These are articles/etc. posted about POI around the web. If you
see POI in the news or mentioned at least somewhat prominently
on a site (not your homepage that you put the work POI on in
order to get us to link you and by the why here is a picture of
your wife in kids) then send a patch to the list. In general
equal time will be given so please feel free to send inflamatory
defamation as well as favorable, technical and factual. Really
stupid things won't be mentioned (sorry).
</p>
</section>
<section title="English">
<ul>
<li>
<link href="http://archive.midrange.com/web400/200204/msg00023.html">Discussion about using POI on AS/400s</link>
</li>
<li>
<link href="http://www.somelist.com/mails/23819.html">Discussion from back when we almost had POI as the filter for KOffice if politics and licenses hadn't killed iit</link>
</li>
<li>
<link href="http://www.oreillynet.com/pub/wlg/1552?page=last&amp;x-showcontent=text">Java discussion on O'Reilly Network including discussion about POI</link> - O'Reilly.net
</li>
<li>
<link href="http://www.rollerweblogger.org/page/roller/20020715">Poor Obfuscation Implementation.</link> - Blog of David M. Johnson
</li>
<li>
<link href="http://www.jsurfer.org/article.php?sid=322">
POI 1.5-dev-rc2 released </link> - JSurfer
</li>
<li>
<link href="http://directory.google.com/Top/Computers/Programming/Languages/Java/Class_Libraries/Data_Formats/Microsoft_Formats/"> Google says we're the most important in our category </link>
</li>
<li>
<link href="http://www.javaworld.com/javaworld/javaqa/2002-05/01-qa-0503-excel3.html">It's POI-fect</link> - Tony Sintes, Javaworld
</li>
<li>
<link href="http://www.need-a-cake.com/categories/cocoonWeblog/2002/03/07.html">
Nicola announces POI serialization code
</link> - Matthew Langham's Radio Weblog
</li>
<li>
<link href="http://javalobby.org/discussionContext/showThreaded/frm/javalobby?folderId=20&amp;discussionContextId=11523">
Jakarta POI 1.4583 Released</link> - JavaLobby
</li>
<li>
<link href="http://javalobby.org/discussionContext/showThreaded/frm/javalobby?discussionContextId=11442&amp;folderId=20">
POI project moves to Jakarta (OLE 2 CDF/Excel/Word in
pure java)</link> - JavaLobby
</li>
<li>
<link
href="http://www.geocities.com/marcoschmidt.geo/java-image-coding.html">
List of Java libraries to read and write image and document files
</link> Marco Schmidt's homepage (normally we wouldn't
feature someone's homepage but its an extensive list of
information including "alternatives to POI" (for those
of you who are very wealthy). But heck I think I'll
bookmark his page for myself since he's like got every
piece of info known to man linked or featured on it!
</li>
<li>
<link href="http://radio.weblogs.com/0101350/">
The Experiences of an Operator (Måns af Klercker)
</link> - radio.weblogs.com
</li>
<li>
<link href="http://dataconv.org/apps_office.html">
DATACONV - Data Conversion Tools: Office
</link> DATACONV
</li>
<li>
<link href="http://chicago.sourceforge.net/devel/">
Chicago Developer Page
</link>
</li>
<li>
<link href="http://www.onjava.com/pub/d/1157">
POI/POI Serialization Project
</link> - Man you know you've hit the bigtime when
O'Reilly Likes you.. ;-)
</li>
<li>
<link
href="http://www.javaworld.com/netnews/index.shtml">
News Around the Net
</link> - Java World
</li>
</ul>
</section>
<section title="Nederlandstalige (Dutch)">
<ul>
<li>
<link
href="http://www.ster.be/java/java9.html">
Een Excel-werkboek maken vanuit Java - Lieven Smits
</link>
</li>
</ul>
</section>
<section title="Deutsch (German)">
<ul>
<li> <link
href="http://www.entwickler.com/itr/news/show.php3?id=6132&amp;nodeid=82 ">Apache POI verffentlicht</link> - entwicker.com
</li>
<li>
<link
href="http://www.jsp-develop.de/newsletter/10/">
Apache Jakarta-Projekt bringt Word und Excel in die Java-Welt </link> - jsp-develop.de (for the misguided who use JSP ;-) )
</li>
<li>
<link
href="http://www.entwickler.com/news/2002/02/5718/news.shtml">
Neues Apache-Projekt bringt Word- und Excel nach Java
</link> - entwickler.com
</li>
</ul>
</section>
<section title="Español (Spanish)">
<ul>
<li>
<link href="http://www.javahispano.com/noticias/todas.jsp">
OLE2 desde Java nativo
</link> - javaHispano
</li>
<li>
<link href="http://p2p.wrox.com/archive/java_espanol/2002-08/3.asp">Spanish discussion about Excel and Java including POI from Wrox forums</link>
</li>
</ul>
</section>
<section title="Francais (French)">
<ul>
<li>
<link href="http://linuxfr.org/section/D%E9veloppeur,0,1,8,0.html">
Excel/OLE accessibles
</link> - Da Linux French Page
</li>
<li>
<link href="http://www.sogid.com/javalist/f2002/traiter_word_java.html">Discussion on POI in French</link>
</li>
</ul>
</section>
<section title="Nihongo (Japanese)">
<ul>
<li>
<link href="http://drpanda.freezope.org/Memo/docs/jakarta/poi/poi_sample">100% PureJava...</link> - Dr. Panda Portal
</li>
<li>
<link
href="http://www.gimlay.org/~andoh/java/javanew.html">
What's new with java?
</link> - gimlay.org
</li>
<li><link href="http://taka-2.com/jclass/POI/">Java?Excel?????</link> - appears to show how to use Japanese with POI</li>
<li><link href="http://www.tech-arts.co.jp/macosx/webobjects-jp/htdocs/3200/3218.html">Various discussion in Japanese including on POI</link></li>
<li><link href="http://muimi.com/j/jakarta/">Japanese resources on Jakarta projects including POI</link></li>
<li><link href="http://www.fk.urban.ne.jp/home/kishida/">Kishida's site</link> various information, includes a snip about POI and Japanese.</li>
</ul>
</section>
<section title="Dunno how to say Russian in Russian (Russian)">
<ul>
<li>
<link href="http://www.nestor.minsk.by/kg/kg02/21/kg22108.html">
Probably a translation of the Javalobby announcement of 1.5-final
</link> Java-???????
</li>
</ul>
</section>
<section title="Dunno how to say Korean in Korean (Korean)">
<ul>
<li>
<link href="http://www.javabrain.co.kr/AnswerView?questionId=1189&mp;categoryId=8">Various discussion in Korean about Excel output/APIs including POI</link>
</li>
</ul>
</section>
<section title="No freaking idea">
<p>
If you can read one of these languages, send mail to the list
telling us what language it is and we'll categorize it!
</p>
<ul>
<li>
<link
href="http://www.javacentrix.com/index.htm">
If I had to guess, I'd say this is Thai, but
maybe you actually know</link> - javacentrix.com
</li>
</ul>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="Poi Project News Pages"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
</menu>
<menu label="News">
<menu-item label="Logo Submissions" href="logocontest.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "document-v11.dtd">
<document>
<header>
<title></title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="GS" name="Glen Stampoultzis" email="glens@apache.org"/>
</authors>
</header>
<body>
<section title="POI logos">
<p>
Here are the current logo submissions. Thanks to the artists!
</p>
<section title="Michael Mosmann">
<p>
<img src="images/logoMichaelMosmann.png"/>
</p>
</section>
<section title="Loïc Lefèvre">
<p>
<img src="images/logoLoicLefevre.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoLoicLefevre2.png"/>
</p>
</section>
<section title="Glen Stampoultzis">
<p>
<img src="images/logoGlenStampoutlzis.png"/>
</p>
</section>
<section title="Marcus Gustafsson">
<p>
<img src="images/logoGustafsson1.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoGustafsson2.png"/>
</p>
</section>
<section title="Adrianus Handoyo">
<p>
<img src="images/logoAdria1.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoAdria2.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoAdria3.png"/>
</p>
</section>
<section title="RussellBeattie">
<p>
<img src="images/logoRussellBeattie1.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoRussellBeattie2.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoRussellBeattie3.png"/>
</p>
<p>
<img src="images/logoRussellBeattie4.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoRussellBeattie5.png"/>
</p>
</section>
<section title="Daniel Fernandez">
<p>
<img src="images/logoDanielFernandez.png"/>
</p>
</section>
<section title="Andrew Clements">
<p>
<img src="images/logoAndrewClements.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoAndrewClements2.png"/>
</p>
</section>
<section title="Wendy Wise">
<p>
<img src="images/logoWendyWise.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoWendyWise2.png"/>
</p>
</section>
<section title="Nikhil Karmokar">
<p>
<img src="images/logoKarmokar1.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoKarmokar1s.png"/>
</p>
<p>
<img src="images/logoKarmokar2.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoKarmokar2s.png"/>
</p>
<p>
<img src="images/logoKarmokar3.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoKarmokar3s.png"/>
</p>
<p>
<img src="images/logoKarmokar4.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoKarmokar4s.png"/>
</p>
<p>
<img src="images/logoKarmokar5.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoKarmokar5s.png"/>
</p>
<p>
<img src="images/logoKarmokar6.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoKarmokar6s.png"/>
</p>
</section>
<section title="Lieven Janssen">
<p>
<img src="images/logoJanssen1.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoJanssen2.png"/>
</p>
</section>
<section title="RaPi GmbH">
<p>
Contact Person: Fancy at: fancy at my-feiqi.com
</p>
<p>
<img src="images/logoRaPiGmbH1.png"/>&nbsp;&nbsp;&nbsp;
<img src="images/logoRaPiGmbH2.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH5.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH6.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH7.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH8.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH9.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH10.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH11.png"/>
</p>
<p>
<img src="images/logoRaPiGmbH12.png"/>
</p>
</section>
<section title="Randy Stanard">
<p>
<img src="images/logoRandyStanard01.png"/>
</p>
<p>
<img src="images/logoRandyStanard02.png"/>
</p>
<p>
<img src="images/logoRandyStanard03.png"/>
</p>
<p>
<img src="images/logoRandyStanard04.png"/>
</p>
<p>
<img src="images/logoRandyStanard05.png"/>
</p>
<p>
<img src="images/logoRandyStanard06.png"/>
</p>
<p>
<img src="images/logoRandyStanard07.png"/>
</p>
<p>
<img src="images/logoRandyStanard08.png"/>
</p>
</section>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Overview</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
</authors>
</header>
<body>
<section title="What is it?">
<p>The POI project is the master project for developing pure
Java ports of file formats based on Microsoft's OLE 2 Compound
Document Format. OLE 2 Compound Document Format is used by
Microsoft Office Documents, as well as by programs using MFC
property sets to serialize their document objects.
</p>
</section>
<section title="Sub-Projects">
<p>
There following are ports, packages or components contained in the POI project.
</p>
<section title="POIFS">
<p>
<link href="poifs/index.html">POIFS</link> is the set of APIs
for reading and writing OLE 2 Compound Document Formats using (only) Java.
</p>
</section>
<section title="HSSF">
<p>
<link href="hssf/index.html">HSSF</link> is the set of APIs
for reading and writing Microsoft Excel 97(-XP) spreadsheet using (only) Java.
</p>
</section>
<section title="HDF">
<p>
<link href="hdf/index.html">HDF</link> is the set of APIs
for reading and writing Microsoft Word 97(-XP) spreadsheet using (only) Java.
</p>
</section>
<section title="HPSF">
<p>
<link href="hpsf/index.html">HPSF</link> is the set of APIs
for reading property sets using (only) Java.
</p>
</section>
<section title="POI-Utils">
<p>
<link href="utils/index.html">POI-Utils</link> are general purpose artifacts
from POI development that have not yet been implemented elsewhere. We're
always looking to donate these and maintain them as part of a general library
used in another project. These are things we need to complete our mission but
are generally outside of it.
</p>
</section>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Poi Project All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document><header><title>Patch Queue</title><authors><person email="greenrd@hotmail.com" name="Robin Green"/><person email="barozzi@nicolaken.com" name="Nicola Ken Barozzi"/></authors></header><body><section title="Introduction"><p>
This is an <strong>informal</strong> list - in chronological order -
of some of the noteworthy patches that have been posted
to the <code>developers</code> mailing list.
These patches are not (yet) part of the Poi project, but need reviewing for possible
inclusion. This system was instituted because, due to the large volume of mail and
the lack of time of the committers, some patches tended to get forgotten about. This
queue does not guarantee that any patch will be reviewed within a reasonable time frame,
but it does at least make them easier to find!
</p><p><strong>Reviewers wanted!</strong> - If you have time to review and/or test these patches,
we would be grateful for your time. Please post comments to the dev mailing lists.
</p><p>
Before submitting a patch, please read the page on <connect href="contrib.xml">Third-Party
Contributions</connect>. The preferred submission method for patches is:
</p><ul><li>Post to Poi developers list</li><li>Describe the patch, the reason for it and (if necessary) why this is important.</li><li>Generate the patch in <code>diff -u</code> format from CVS</li><li>Also generate a documentation patch or new file, if this is something that should be documented.
</li><li>Post as an attachment rather than inline (unless it is trivially small).</li></ul><p>Following the above guidelines will facilitate your patch being reviewed
and applied efficiently.</p></section><section title="Patch Queue"><p><strong> [Under Construction] </strong> Archive links will be added later.
<strong>Please do not bother the patch submitters/authors</strong> without first reading the
relevant post(s) in the <connect href="mail-archives.xml">mailing list archives.</connect></p><p>Vapourware will not be listed.</p><table><tr><th>id</th><th>Summary</th><th>Reviewer</th><th>Resolution</th><th>Status</th></tr></table><p>See also additional list of patches to be added in <connect href="todo.xml">To Do</connect>.
</p></section></body></document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "document-v11.dtd">
<document>
<header>
<title>POI 1.0 Vision Document</title>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Marcus W. Johnson" email="mjohnson@apache.org"/>
</authors>
</header>
<body>
<section title="Preface">
<p>
(21-Jan-02) While this document is just full of useful project
introductory information and I do suggest those interested in getting
involved in the project read it, it is woefully out of date.
</p>
<p>
We deliberately allowed this document to run out of date because it
is a good reflection of what the original vision was for POI 1.0.
You'll note that some of the terminology is not used in quite the same
way any longer. I've made some minor corrections where reading this
confused me. An example: in some places this document may refer to
POI API instead of POIFS API. When this vision was written we had
an incomplete understanding of the project.
</p>
<p>
Lastly, the scope of the project expanded dramatically near the end
of the 1.0 cycle. Our vision at the time was to focus merely on the
Excel port (having no idea how the project would grow or be received)
and provide the OLE 2 Compound Document port for others to port later
formats. We now plan to spearhead these ports under the umbrella of
the POI project. So, you've been warned. Read on, but just realize
that we had a fuzzy view of things to come, and hindsight is 20-20.
</p>
<p>
If I recall major holes were: a complete understanding of the format
of OLE 2 Compound Document format, Excel file format, and exactly how
Cocoon 2 Serializers worked. (that just about covers the whole range
huh?)
</p>
</section>
<section title="1. Introduction">
<section title="1.1 Purpose of this document">
<p>
The purpose of this document is to
collect, analyze and define high-level requirements, user needs and
features of the HSSF Serializer for Cocoon 2 and related libraries.
The HSSF Serializer is a java class supporting the Serializer
interface from the Cocoon 2 project and outputting in a compatible
format of that used by the spreadsheet program Microsoft Excel '97.
The HSSF Serializer will be responsible for converting XML
spreadsheet-like documents into Excel-compatible XLS spreadsheets.
</p>
</section>
<section title="1.2 Project Overview">
<p>
Many web apps today hit a brick wall
when it comes to the user request that they be able to easily
manipulate their reports and data extracts in the popular Microsoft
Excel spreadsheet format. This often causes inferior technologies to be
chosen for the project simply because they easily support this
format. This project seeks to extend existing XML, Java and Apache
Cocoon 2 project technologies by:
</p>
<ul>
<li>
providing an extensible library
(POIFS) which reads/writes in a compatable format to OLE 2 Compound
Document Format (aka Structured Storage Format) for easy
implementation of other document types;
</li>
<li>
providing a library (HSSF) for
manipulating spreadsheet data and outputting it in a compatible
format to Microsoft Excel XLS format;
</li>
<li>
and providing a Cocoon 2
Serializer (HSSFSerializer) for serializing XML documents as
Excel-compatible spreadsheets.
</li>
</ul>
</section>
</section>
<section title="2. User Description">
<section title="2.1 User/Market Demographics">
<p>
There are a number of enthusiastic
users of XML, UNIX and Java technology. Secondly, the Microsoft
solution for outputting Office Document formats often involves
actually manipulating the software as an OLE Server. This method
provides extremely low performance, extremely high overhead and is
only capable of handling one document at a time.
</p>
<ol>
<li>
Our intended audience for the HSSF
Serializer portion of this project are developers writing reports or
data extracts in XML format.
</li>
<li>
Our intended audience for the HSSF
library portion of this project is ourselves as we are developing
the Serializer and anyone who needs to write to Excel spreadsheets
in a non-XML Java environment or who has specific needs not
addressed by the Serializer.
</li>
<li>
Our intended audience for the
&quot;POIFS&quot; OLE 2 Compound Document format reader/writer is
ourselves as we are writing the HSSF library and secondly, anyone
wishing to provide other libraries for reading/writing OLE 2
Compound Document Format in Java.
</li>
</ol>
</section>
<section title="2.2. User environment">
<p>
The users of this software shall be
developers in a Java environment on any Operating System or power
users who are capable of XML document generation/deployment.
</p>
</section>
<section title="2.3. Key User Needs">
<p>
The OLE 2 Compound Document format is
undocumented for all practical purposes and cryptic for all
impractical purposes. Developer needs in this area include
documentation and an easy to use library for reading and writing in
this format without requiring the developer to have intimate
knowledge of the format.
</p>
<p>
There is currently no good way to write
to Microsoft Excel documents from Java or from a non-Microsoft
Windows based platform for that matter. Developers need an easy to
use library that supports a reasonable feature set and allows
seperation of data from formatting/stylistic concerns.
</p>
<p>
There is currently no good way to
transform XML data to Microsoft Excel. Apache's Cocoon 2 project
supplies a complete framework for XML, but nothing for outputting in
Excel's XLS format. Developers and power users alike need a simple
method to output XML documents to Excel through server-side
processing.
</p>
</section>
<section title="2.4. Alternatives and Competition">
<p>
Originally there weren't any decent <link href="../hssf/alternatives.html">alternatives</link> for reading or writing
to Excel. This has changed somewhat.
</p>
</section>
</section>
<section title="3. Project Overview">
<section title="3.1. Project Perspective">
<p>
The produced code shall be licensed by
the Apache License as used by the Cocoon 2 project and maintained on
a project page until such time as the Cocoon 2 developers accept it
as a donation (at which time the copyright will be turned over to
them).
</p>
</section>
<section title="3.2. Project Position Statement">
<p>
For developers on a Java and/or XML
environment this project will provide all the tools necessary for
outputting XML data in the Microsoft Excel format. This project seeks
to make the use of Microsoft Windows based servers unnecessary for
file format considerations and to fully document the OLE 2 Compound
Document format. The project aims not only to provide the tools for
serializing XML to Excel's file format and the tools for writing to
that file format from Java, but also to provide the tools for later
projects to convert other OLE 2 Compound Document formats to pure
Java APIs.
</p>
</section>
<section title="3.3. Summary of Capabilities">
<p>
HSSF Serializer for Apache Cocoon 2
</p>
<table>
<tr>
<td>
Benefit
</td>
<td>
Supporting Features
</td>
</tr>
<tr>
<td>
Standard XML tag language for sheet data
</td>
<td>
Serializer will transform documents utilizing a defined tag
language
</td>
</tr>
<tr>
<td>
Utilize XML to output in Excel
</td>
<td>
Serializer will output in Excel
</td>
</tr>
<tr>
<td>
Java API to output in Excel on any platform
</td>
<td>
The project will develop an API that outputs in Excel using
pure Java.
</td>
</tr>
<tr>
<td>
Make it easy for developers to port other OLE 2 Compound
Document-based formats to Java.
</td>
<td>
The POIFS library will contain both a high-level abstraction
along with low-level constructs. The project will fully document
the OLE 2 Compound Document Format.
</td>
</tr>
</table>
</section>
<section title="3.4. Assumptions and Dependencies">
<ul>
<li>
The HSSF Serializer will run on
any Java 2 supporting platform with Apache Cocoon 2 installed along
with the HSSF and POIFS APIs.
</li>
<li>
The HSSF API requires a Java 2
implementation and the POI API.
</li>
<li>
The POIFS API requires a Java 2
implementation.
</li>
</ul>
</section>
</section>
<section title="4. Project Features">
<p>
The POIFS API will include:
</p>
<ul>
<li>
Low level structures representing
the structures in a POI filesystems.
</li>
<li>
A low-level API for
creating/manipulating POI filesystems.
</li>
<li>
A set of high level interfaces
abstracting the user from the POI filesystem constructs and
representing it as a standard filesystem (Files, directories, etc)
</li>
</ul>
<p>
The HSSF API will include:
</p>
<ul>
<li>
Low level structures representing
the structures in an Excel file.
</li>
<li>
A low-level API for creating and
manipulating Excel files and writing them into POI filesystems.
</li>
<li>
A high level model and style
interface for manipulating spreadsheet data without knowing anything
about the Excel format itself.
</li>
</ul>
<section title="4.1 POI Filesystem API">
<p>
The POI Filesystem API includes:
</p>
<ul>
<li>An implementation of Big Blocks</li>
<li>An implementation of Small Blocks</li>
<li>An implementation of Header Blocks</li>
<li>An implementation of Block Allocation Tables</li>
<li>An implementation of Property Sets</li>
<li>An implementation of the POI
filesystem including functions to get and set the above constructs;
compound functions for reading/writing files/directories.
</li>
<li>An abstraction of the POI
filesystem providing interfaces representing Files, Directories,
FileSystems in normal terminology and encapulating the above
constructs.
</li>
<li>Full documentation of the POI file
format.
</li>
<li>Full documentation of the APIs and
interfaces provided through Javadoc, user documentation (aimed at
developers using the APIs)
</li>
<li>Examples aimed at teaching the
user to write code using POI. (titled: recipes for POI)
</li>
<li>Performance specifications.
(Example POI filesystems rated by some measure of complexity along
with system specifications and execution times for given operations)
</li>
</ul>
</section>
<section title="4.2 HSSF API">
<p>
The HSSF API includes:
</p>
<ul>
<li>An implementation of Record
(binary 2 byte type followed by 2 byte size (n) followed by n bytes)</li>
<li>Implementations of many standard
record types mapping the data bytes to fields along with methods to
reserialize those fields</li>
<li>An implementation of the HSSF File
including functions to get/set the above constructs, create a blank
file with the minimum required record types and mappings between
getting/setting data and style in a workbook to the creation of
record types, and read HSSF files.</li>
<li>An abstraction of the HSSF file
format providing interfaces representing the HSSF File, HSSF
Workbook, HSSF Sheet, HSSF Column, HSSF Formulas in a manner
seperating the data from the styling and encapsulating the above
constructs.</li>
<li>Full documentation of the HSSF
file format (which will be a subset of the Excel '97 File format).
This must be done with care for legal reasons.</li>
<li>Full documentation of the APIs and
interfaces provided through Javadoc, user documentation (aimed at
developers using the apis).</li>
<li>Examples aimed at teaching
developers to use the APIs.
</li>
<li>Performance specifications.
(Example files rated by some measure of complexity along with system
specifications and execution times for given operations - possibly
the same files used for POI's tests)</li>
</ul>
</section>
<section title="4.3 HSSF Serializer">
<p>
The HSSF Serializer subproject:
</p>
<ul>
<li>A class supporting the Cocoon 2
Serializer Interface.</li>
<li>An interface between the SAX
events and the HSSF APIs.</li>
<li>A specified tag language for using
with the Serializer.</li>
<li>Documentation on the tag language
for the HSSF Serializer</li>
<li>Normal javadocs.</li>
<li>Example XML files</li>
<li>Performance specifications.
(Example XML docs and stylesheets rated by some measure of
complexity along with system specifications and execution times)</li>
</ul>
</section>
</section>
<section title="5. Other Product Requirements">
<section title="5.1. Applicable Standards">
<p>
All Java code will be 100% pure Java.
</p>
</section>
<section title="5.2. System Requirements">
<p>
The minimum system requirements for POIFS are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
</ul>
<p>
The minimum system requirements for HSSF are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>POIFS API</li>
</ul>
<p>
The minimum system requirements for the HSSF Serializer are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>Cocoon 2</li>
<li>HSSF API</li>
<li>POI API</li>
</ul>
</section>
<section title="5.3. Performance Requirements">
<p>
All components must perform well enough
to be practical for use in a webserver environment (especially
Cocoon2/Tomcat/Apache combo)
</p>
</section>
<section title="5.4. Environmental Requirements">
<p>
The software will run primarily in
developer environments. We should make some allowances for
not-highly-technical users to write XML documents for the HSSF
Serializer. All other components will assume intermediate Java 2
knowledge. No XML knowledge will be required except for using the
HSSF Serializer. As much documentation as is practical shall be
required for all components as XML is relatively new, and the
concepts introduced for writing spreadsheets and to POI filesystems
will be brand new to Java and many Java developers.
</p>
</section>
</section>
<section title="6. Documentation Requirements">
<section title="6.1 POI Filesystem">
<p>
The filesystem as read and written by
POI shall be fully documented and explained so that the average Java
developer can understand it.
</p>
</section>
<section title="6.2. POI API">
<p>
The POI API will be fully documented
through Javadoc. A walkthrough of using the high level POI API shall
be provided. No documentation outside of the Javadoc shall be
provided for the low-level POI APIs.
</p>
</section>
<section title="6.3. HSSF File Format">
<p>
The HSSF File Format as implemented by
the HSSF API will be fully documented. No documentation will be
provided for features that are not supported by HSSF API that are
supported by the Excel 97 File Format. Care will be taken not to
infringe on any &quot;legal stuff&quot;.
</p>
</section>
<section title="6.4. HSSF API">
<p>
The HSSF API will be documented by
javadoc. A walkthrough of using the high level HSSF API shall be
provided. No documentation outside of the Javadoc shall be provided
for the low level HSSF APIs.
</p>
</section>
<section title="6.5. HSSF Serializer">
<p>
The HSSF Serializer will be documented
by javadoc.
</p>
</section>
<section title="6.6 HSSF Serializer Tag language">
<p>
The XML tag language along with
function and usage shall be fully documented. Examples will be
provided as well.
</p>
</section>
</section>
<section title="7. Terminology">
<section title="7.1 Filesystem">
<p>
filesystem shall refer only to the POI formatted archive.
</p>
</section>
<section title="7.2 File">
<p>
file shall refer to the embedded data stream within a
POI filesystem. This will be the actual embedded document.
</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "document-v11.dtd">
<document>
<header>
<title>POI 2.0 Vision Document</title>
<authors>
<person name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
<person name="Marcus W. Johnson" email="mjohnson@apache.org"/>
<person name="Glen Stampoultzis" email="gstamp@iprimus.com.au"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Preface">
<p>
This is the POI 2.0 cycle vision document. Although the vision
has not changed and this document is certainly not out of date and
the vision has not changed, the structure of the project has
changed a bit. We're not going to change the vision document to
reflect this (however proper that may be) because it would only
involve deletion. There is no purpose in providing less
information provided we give clarification.
</p>
<p>
This document was created before the POI components for
<link href="http://xml.apache.org/cocoon">Apache Cocoon</link>
were accepted into the Cocoon project itself. It was also
written before POI was accepted into Jakarta. So while the
vision hasn't changed some of the components are actually now
part of other projects. We'll still be working on them on the
same timeline roughly (minus the overhead of coordination with
other groups), but they are no longer technically part of the
POI project itself.
</p>
</section>
<section title="1. Introduction">
<section title="1.1 Purpose of this document">
<p>
The purpose of this document is to
collect, analyze and define high-level requirements, user needs,
and features of the second release of the POI project software.
The POI project currently consists of the following components:
the HSSF Serializer, the HSSF library and the POIFS library.
</p>
<ul>
<li>
The HSSF Serializer is a set of Java classes whose main
class supports the Serializer interface from the Cocoon
2 project and outputs the serialized data in a format
compatible with the spreadsheet program Microsoft Excel
'97.
</li>
<li>
The HSSF library is a set of classes for reading and
writing Microsoft Excel 97 file format using pure Java.
</li>
<li>
The POIFS library is a set of classes for reading and
writing Microsoft's OLE 2 Compound Document format using
pure Java.
</li>
</ul>
<p>By the completion of this release cycle the POI project will also
include the HSSF Generator and the HDF library.
</p>
<ul>
<li>The HSSF Generator will be responsible for using HSSF to read
in the XLS (Excel 97) file format and create SAX events. The HSSF
Generator will support the applicable interfaces specified by the
Apache Cocoon 2 project.
</li>
<li>The HDF library will provide a set of high level interfaces
for reading and writing Microsoft Word 97 file format using pure
Java.</li>
</ul>
</section>
<section title="1.2 Project Overview">
<p>
The first release of the POI project
was an astounding success. This release seeks to build on that
success by:
</p>
<ul>
<li>
Refactoring POIFS into imput and
output classes as well as an event-driven API for reading.
</li>
<li>
Refactor HSSF for greater
performance as well as an event-driven API for reading
</li>
<li>
Extend HSSF by adding the ability to read and write formulas.
</li>
<li>
Extend HSSF by adding the ability to read and write
user-defined styles.
</li>
<li>
Create a Cocoon 2 Generator for HSSF using the same tags
as the HSSF Serializer.
</li>
<li>
Create a new library (HDF) for reading and writing
Microsoft Word DOC format.
</li>
<li>
Refactor the HSSFSerializer into a separate extensible
POIFSSerializer and HSSFSerializer
</li>
<li>
Providing the create excel charts. (write only)
</li>
</ul>
</section>
</section>
<section title="2. User Description">
<section title="2.1 User/Market Demographics">
<p>
There are a number of enthusiastic
users of XML, UNIX and Java technology. Furthermore, the Microsoft
solution for outputting Office Document formats often involves
actually manipulating the software as an OLE Server. This method
provides extremely low performance, extremely high overhead and is
only capable of handing one document at a time.
</p>
<ol>
<li>
Our intended audience for the HSSF
Serializer portion of this project are developers writing reports or
data extracts in XML format.
</li>
<li>
Our intended audience for the HSSF
library portion of this project is ourselves as we are developing
the HSSF serializer and anyone who needs to read and write Excel
spreadsheets in a non-XML Java environment, or who has specific
needs not addressed by the Serializer
</li>
<li>
Our intended audience for the
POIFS library is ourselves as we are developing the HSSF and HDF
libraries and anyone wishing to provide other libraries for
reading/writing other file formats utilizing the OLE 2 Compound
Document Format in Java.
</li>
<li>
Our intended audience for the HSSF
generator are developers who need to export Excel spreadsheets to
XML in a non-proprietary environment.
</li>
<li>
Our intended audience for the HDF
library is ourselves, as we will be developing a HDF Serializer in a
later release, and anyone wishing to add .DOC file processing and
creation to their projects.
</li>
</ol>
</section>
<section title="2.2. User environment">
<p>
The users of this software shall be
developers in a Java environment on any operating system, or power
users who are capable of XML document generation/deployment.
</p>
</section>
<section title="2.3. Key User Needs">
<p>
The HSSF library currently requires a
full object representation to be created before reading values. This
results in very high memory utilization. We need to reduce this
substantially for reading. It would be preferable to do this for
writing, but it may not be possible due to the constraints imposed by
the file format itself. Memory utilization during read is our top
user complaint.
</p>
<p>
The POIFS library currently requires a
full object representation to be created before reading values. This
results in very high memory utilization. We need to reduce this
substantially for reading.
</p>
<p>
The HSSF library currently ignores
formula cells and identifies them as &quot;UnknownRecord&quot; at the
lower level of the API. We must provide a way to read and write
formulas. This is now the top requested feature.
</p>
<p>
The HSSF library currently does not support
charts. This is a key requirement of some users who wish to use HSSF
in a reporting engine.
</p>
<p>
The HSSF Serializer currently does not
provide serialization for cell styling. User's will want stylish
spreadsheets to result from their XML.
</p>
<p>
There is currently no way to generate
the XML from an XLS that is consistent with the format used by the
HSSF Serializer.
</p>
<p>
There should be a way to read and write
the DOC file format using pure Java.
</p>
</section>
<section title="2.4. Alternatives and Competition">
<p>
Originally there weren't any decent <link href="../hssf/alternatives.html">alternatives</link> for reading or writing
to Excel. This has changed somewhat.
</p>
</section>
</section>
<section title="3. Project Overview">
<section title="3.1. Project Perspective">
<p>
The produced code shall be licensed by
the Apache License as used by the Cocoon 2 project (APL 1.1) and
maintained on at <link href="http://poi.sourceforge.net/">http://poi.sourceforge.net</link>
and <link href="http://sourcefoge.net/projects/poi">http://sourcefoge.net/projects/poi</link>.
It is our hope to at some point integrate with the various Apache
projects (xml.apache.org and jakarta.apache.org), at which point we'd
turn the copyright over to them.
</p>
</section>
<section title="3.2. Project Position Statement">
<p>
For developers on a Java and/or XML
environment this project will provide all the tools necessary for
outputting XML data in the Microsoft Excel format. This project seeks
to make the use of Microsoft Windows based servers unnecessary for
file format considerations and to fully document the OLE 2 Compound
Document format. The project aims not only to provide the tools for
serializing XML to Excel and Word file formats and the tools for
writing to those file formats from Java, but also to provide the
tools for later projects to convert other OLE 2 Compound Document
formats to pure Java APIs.
</p>
</section>
<section title="3.3. Summary of Capabilities">
<p>
HSSF Serializer for Apache Cocoon 2
</p>
<table>
<tr>
<td>
<b>Benefit</b>
</td>
<td>
<b>Supporting Features</b>
</td>
</tr>
<tr>
<td>
Ability to serialize styles from XML spreadsheets.
</td>
<td>
HSSFSerialzier will support styles.
</td>
</tr>
<tr>
<td>
Ability to read and write formulas in XLS files.
</td>
<td>
HSSF will support reading/writing formulas.
</td>
</tr>
<tr>
<td>
Ability to output in MS Word on any platform using Java.
</td>
<td>
The project will develop an API that outputs in Word format
using pure Java.
</td>
</tr>
<tr>
<td>
Enhance performance for reading and writing XLS files.
</td>
<td>
HSSF will undergo a number of performance enhancements. HSSF
will include a new event-based API for reading XLS files. POIFS
will support a new event-based API for reading OLE2 CDF files.
</td>
</tr>
<tr>
<td>
Ability to generate XML from XLS files
</td>
<td>
The project will develop an HSSF Generator.
</td>
</tr>
<tr>
<td>
The ability to generate charts
</td>
<td>
HSSF will provide low level support for chart records as well
as high level API support for generating charts. The ability
to read chart information will not initially be provided.
</td>
</tr>
</table>
</section>
<section title="3.4. Assumptions and Dependencies">
<ul>
<li>
The HSSF Serializer and Generator
will support the Gnumeric 1.0 XML tag language.
</li>
<li>
The HSSF Generator and HSSF
Serializer will be mutually validating. It should be possible to
have an XLS file created by the Serializer run through the Generator
and the output back through the Serializer (via the Cocoon pipeline)
and get the same file or a reasonable facimille (no one cares if it
differs by the order of the binary records in some minor but
non-visually recognizable manner).
</li>
<li>
The HSSF Generator will run on any
Java 2 supporting platform with Apache Cocoon 2 installed along with
the HSSF and POIFS APIs.
</li>
<li>
The HSSF Serializer will run on
any Java 2 supporting platform with Apache Cocoon 2 installed along
with the HSSF and POIFS APIs.
</li>
<li>
The HDF API requires a Java 2
implementation and the POIFS API.
</li>
<li>
The HSSF API requires a Java 2
implementation and the POIFS API.
</li>
<li>
The POIFS API requires a Java 2
implementation.
</li>
</ul>
</section>
</section>
<section title="4. Project Features">
<p>
Enhancements to the POIFS API will
include:
</p>
<ul>
<li>
An event driven API for reading
POIFS Filesystems.
</li>
<li>
A low-level API for
creating/manipulating POI filesystems.
</li>
<li>
Code improvements supporting
greater separation between read and write structures.
</li>
</ul>
<p>
Enhancements to the HSSF API will
include:
</p>
<ul>
<li>
An event driven API for reading
XLS files.
</li>
<li>
Performance improvements.
</li>
<li>
Formula support (read/write)
</li>
<li>
Support for user-defined data
formats
</li>
<li>
Better documentation of the file
format and structure.
</li>
<li>
An API for creation of charts.
</li>
</ul>
<p>
The HSSF Generator will include:
</p>
<ul>
<li>
A set of classes supporting the
Cocoon 2 Generator interfaces providing a method for reading XLS
files and outputting SAX events.
</li>
<li>
The same tag format used by the
HSSFSerializer in any given release.
</li>
</ul>
<p>
The HDF API will include:
</p>
<ul>
<li>
An event driven API for reading
DOC files.
</li>
<li>
A set of high and low level APIs
for reading and writing DOC files.
</li>
<li>
Documentation of the DOC file
format or enhancements to existing documentation.
</li>
</ul>
</section>
<section title="5. Other Product Requirements">
<section title="5.1. Applicable Standards">
<p>
All Java code will be 100% pure Java.
</p>
</section>
<section title="5.2. System Requirements">
<p>
The minimum system requirements for the POIFS API are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
</ul>
<p>
The minimum system requirements for the the HSSF API are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>POIFS API</li>
</ul>
<p>
The minimum system requirements for the the HDF API are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>POIFS API</li>
</ul>
<p>
The minimum system requirements for the HSSF Serializer are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>Cocoon 2</li>
<li>HSSF API</li>
<li>POI API</li>
</ul>
</section>
<section title="5.3. Performance Requirements">
<p>
All components must perform well enough
to be practical for use in a webserver environment (especially
the "killer trio": Cocoon2/Tomcat/Apache combo)
</p>
</section>
<section title="5.4. Environmental Requirements">
<p>
The software will run primarily in
developer environments. We should make some allowances for
not-highly-technical users to write XML documents for the HSSF
Serializer. All other components will assume intermediate Java 2
knowledge. No XML knowledge will be required except for using the
HSSF Serializer. As much documentation as is practical shall be
required for all components as XML is relatively new, and the
concepts introduced for writing spreadsheets and to POI filesystems
will be brand new to Java and many Java developers.
</p>
</section>
</section>
<section title="6. Documentation Requirements">
<section title="6.1 POI Filesystem">
<p>
The filesystem as read and written by
POI shall be fully documented and explained so that the average Java
developer can understand it.
</p>
</section>
<section title="6.2. POI API">
<p>
The POI API will be fully documented
through Javadoc. A walkthrough of using the high level POI API shall
be provided. No documentation outside of the Javadoc shall be
provided for the low-level POI APIs.
</p>
</section>
<section title="6.3. HSSF File Format">
<p>
The HSSF File Format as implemented by
the HSSF API will be fully documented. No documentation will be
provided for features that are not supported by HSSF API that are
supported by the Excel 97 File Format. Care will be taken not to
infringe on any &quot;legal stuff&quot;. Additionally, we are
collaborating with the fine folks at OpenOffice.org on
*free* documentation of the format.
</p>
</section>
<section title="6.4. HSSF API">
<p>
The HSSF API will be documented by
javadoc. A walkthrough of using the high level HSSF API shall be
provided. No documentation outside of the Javadoc shall be provided
for the low level HSSF APIs.
</p>
</section>
<section title="6.5 HDF API">
<p>
The HDF API will be documented by
javadoc. A walkthrough of using the high level HDF API shall be
provided. No documentation outside of the Javadoc shall be provided
for the low level HDF APIs.
</p>
</section>
<section title="6.6 HSSF Serializer">
<p>
The HSSF Serializer will be documented
by javadoc.
</p>
</section>
<section title="6.7 HSSF Generator">
<p>
The HSSF Generator will be documented
by javadoc.
</p>
</section>
<section title="6.8 HSSF Serializer Tag language">
<p>
The XML tag language along with
function and usage shall be fully documented. Examples will be
provided as well.
</p>
</section>
</section>
<section title="7. Terminology">
<section title="7.1 Filesystem">
<p>
filesystem shall refer only to the POI formatted archive.
</p>
</section>
<section title="7.2 File">
<p>
file shall refer to the embedded data stream within a
POI filesystem. This will be the actual embedded document.
</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="Poi Project planning"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
</menu>
<menu label="Planning Documents">
<menu-item label="1.0 Vision" href="POI10Vision.html"/>
<menu-item label="2.0 Vision" href="POI20Vision.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Planning Documentation</title>
<subtitle>Overview</subtitle>
<authors>
<person name="David Crossley" email="crossley@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Overview">
<p>This is a collection of notes to assist with long-term planning and
development.
</p>
<p>There is much discussion of issues and research topics (RT) threads on
the <code>dev</code> mailing list (and elsewhere). However, details
get lost in the sheer volume. This is the place to document the summary of
discussions on some key topics. Some new and complex capabilities will take
lots of design and specification before they can be implemented.
</p>
<p>Another use for this collection of notes is as a place to quickly store
a snippet from an email discussion or even a link to a discussion thread.
The concepts can then be fleshed-out over time.
</p>
<p>Anyone can participate in this process. Please get involved in discussion
on <code>dev</code> and contribute patches for these summary planning
documents via the normal <link href="../contrib.html">contribution</link>
process.
</p>
<p>These planning documents are intended to be concise notes only. They are
also ever-evolving, because as issues are addressed these notes will be
revised.
</p>
</section>
<section title="Topics and Issues">
<ul>
<li><link href="release.html">Release Plan</link>
- major things to do before the 2.0 release</li>
<li><link href="doc.html">Documentation</link>
- revisions and additions are required</li>
<li>See the general <link href="../todo.html">To Do</link> list
and the <code>dev</code> email archives for other issues</li>
</ul>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Release Plan 2.0</title>
<subtitle>Planning Documentation</subtitle>
<authors>
<person name="David Crossley" email="crossley@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Preparation for release of Poi">
<p>Todo</p>
<!-- NKB todo
<p>The 2.0 final release is scheduled for the end of November 2001.
</p>
<p>
The following is extracted from the thread
[C2]: Release Candidate 2 ... 2001-10-29
</p>
<source><![CDATA[
> The question is now, what has to be done until then?
>
> 1) We have many open bugs in bugzilla. These must be reviewed
> and then solved (or declared invalid etc).
>
> 2) Documentation updates (this area lacks most)
> We could move this to the final release.
Documentation must be happening all the time, and not left
until last.
> 3) Decide what to backport from the 2.1 head.
> I'm +1 on removing the CodeFactories completly in 2.0, too.
> This would avoid any backcompatibility problems.
>
> 4) Layout the distribution
> This is a point we haven't discussed yet. Currently our
> distribution is a mixture of a source and a binary one.
> We deliver the source and a compiled version, but in order
> to run Cocoon, the user has to build a war file.
> I propose to split this: one source distribution which is
> similar to the current one but without the precompiled
> cocoon jar and a binary distribution containing only the
> war file. This war file should work in most servlet engines,
> perhaps not in all.
>
> So anything missing here?
5) Ensure that licensing requirements have been met.
update jars.xml, ensure proper banner in *.java header,
verify the current LICENSE* files, ensure that external
components have suitable licensing requirements.
]]></source>
-->
</section>
</body>
</document>

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@ -1,17 +0,0 @@
<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="PoiFS"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
<menu-item label="How To" href="how-to.html"/>
<menu-item label="File System Documentation" href="fileformat.html"/>
<menu-item label="Use Cases" href="usecases.html"/>
</menu>
</book>

667
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@ -1,667 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>POIFS File System Internals</title>
<authors>
<person email="mjohnson@apache.org" name="Marc Johnson" id="MJ"/>
</authors>
</header>
<body>
<section title="POIFS File System Internals">
<section title="Introduction">
<p>POIFS file systems are essentially normal files stored on a
Java-compatible platform's native file system. They are
typically identified by names ending in a four character
extension noting what type of data they contain. For
example, a file ending in &quot;.xls&quot; would likely
contain spreadsheet data, and a file ending in
&quot;.doc&quot; would probably contain a word processing
document. POIFS file systems are called &quot;file
system&quot;, because they contain multiple embedded files
in a manner similar to traditional file systems. Along
functional lines, it would be more accurate to call these
POIFS archives. For the remainder of this document it is
referred to as a file system in order to avoid confusion
with the &quot;files&quot; it contains.</p>
<p>POIFS file systems are compatible with those document
formats used by a well-known software company's popular
office productivity suite and programs outputting
compatible data. Because the POIFS file system does not
provide compression, encryption or any other worthwhile
feature, its not a good choice unless you require
interoperability with these programs.</p>
<p>The POIFS file system does not encode the documents
themselves. For example, if you had a word processor file
with the extension &quot;.doc&quot;, you would actually
have a POIFS file system with a document file archived
inside of that file system.</p>
</section>
<section title="Document Conventions">
<p>This document utilizes the numeric types as described by
the Java Language Specification, which can be found at
<link href="http://java.sun.com">http://java.sun.com</link>. In
short:</p>
<ul>
<li>A <b>byte</b> is an 8 bit signed integer ranging from
-128 to 127.</li>
<li>A <b>short</b> is a 16 bit signed integer ranging from
-32768 to 32767</li>
<li>An <b>int</b> is a 32 bit signed integer ranging from
-2147483648 to 2147483647</li>
<li>A <b>long</b> is a 64 bit signed integer ranging from
-9.22E18 to 9.22E18.</li>
</ul>
<p>The Java Language Specification spells out a number of
other types that are not referred to by this document.</p>
<p>Where this document makes references to &quot;endian
conversion&quot; it is referring to the byte order of
stored numbers. Numbers in &quot;little-endian order&quot;
are stored with the <b>least</b> significant byte first. In
order to properly read a short, for example, you'd read two
bytes and then shift the second byte 8 bits to the left
before performing an <code>or</code> operation to it
against the first byte. The following code illustrates this
method:</p>
<source>
public int getShort (byte[] rec)
{
return ((rec[1] &lt;&lt; 8) | (rec[0] &amp; 0x00ff));
}</source>
</section>
<section title="File System Walkthrough">
<p>This is a walkthrough of a POIFS file system and how it is
put together. It is not intended to give a concise
description but to give a &quot;big picture&quot; of the
general structure and how it's interpreted.</p>
<p>A POIFS file system begins with a header. This header
identifies locations in the file by function and provides a
sanity check identifying a file as a POIFS file system.</p>
<p>The first 64 bits of the header compose a <b>magic number
identifier.</b> This identifier tells the client software
that this is indeed a POIFS file system and that it should
be treated as such. This is a &quot;sanity check&quot; to
make sure this is a POIFS file system and not some other
format. The header also contains an <b>array of block
numbers</b>. These block numbers refer to blocks in the
file. When these blocks are read together they form the
<b>Block Allocation Table</b>. The header also contains a
pointer to the first element in the <b>property table</b>,
also known as the <b>root element</b>, and a pointer to the
<b>small Block Allocation Table (SBAT)</b>.</p>
<p>The <b>block allocation table</b> or <b>BAT</b>, along with
the <b>property table</b>, specify which blocks in the file
system belong to which files. After the header block, the
file system is divided into identically sized blocks of
data, numbered from 0 to however many blocks there are in
the file system. For each file in the file system, its
entry in the property table includes the index of the first
block in the array of blocks. Each block's index into the
array of blocks is also its index into the BAT, and the
integer value stored at that index in the BAT gives the
index of the next block in the array (and thus the index of
the next BAT value). A special value is stored in the BAT
to indicate &quot;end of file&quot;.</p>
<p>The <b>property table</b> is essentially the directory
storage for the file system. It consists of the name of the
file or directory, its <b>start block</b> in both the file
system and <b>BAT</b>, and its actual size. The first
property in the property table is the <b>root
element</b>. It has two purposes: to be a directory entry
(the root of the directory tree, to be specific), and to
hold the start block for the <b>small block data</b>.</p>
<p>Small block data is a special file that contains the data
for small files (less than 4K bytes). It subdivides its
blocks into smaller blocks and there is a special small
block allocation table that, like the main BAT for larger
files, is used to map a small file to its small blocks.</p>
</section>
<section title="Header Block">
<p>The POIFS file system begins with a <b>header
block</b>. The first 64 bits of the header form a long
<b>file type id</b> or <b>magic number identifier</b> of
<code>0xE11AB1A1E011CFD0L</code>. This is basically a
sanity check. If this isn't the first thing in the header
(and consequently the file system) then this is not a
POIFS file system and should be read with some other
library.</p>
<p>It's important to know the most important parts of the
header. These are discussed in the rest of this
section.</p>
<section title="BATs">
<p>At offset <b>0x2C</b> is an int specifying the number
of elements in the <b>BAT array</b>. The array at
<b>0x4C</b> an array of ints. This array contains the
indices of every block in the Block Allocation
Table.</p>
</section>
<section title="XBATs">
<p>Very large POIFS archives may have more blocks than can
be addressed by the BAT blocks enumerated in the header
block. How large? Well, the BAT array in the header can
contain up to 109 BAT block indices; each BAT block
references up to 128 blocks, and each block is 512
bytes, so we're talking about 109 * 128 * 512 =
6.8MB. That's a pretty respectable document! But, you
could have much more data than that, and in today's
world of cheap gigabyte drives, why not? So, the BAT
may be extended in that event. The integer value at
offset <b>0x44</b> of the header is the index of the
first <b>extended BAT (XBAT) block</b>. At offset
<b>0x48</b> of the header, there is an int value that
specifies how many XBAT blocks there are. The XBAT
blocks begin at the specified index into the array of
blocks making up the POIFS file system, and continue in
sequence for the specified count of XBAT blocks.</p>
<p>Each XBAT block contains the indices of up to 128 BAT
blocks, so the document size can be expanded by another
8MB for each XBAT block. The BAT blocks indexed by an
XBAT block are appended to the end of the list of BAT
blocks enumerated in the header block. Thus the BAT
blocks enumerated in the header block are BAT blocks 0
through 108, the BAT blocks enumerated in the first
XBAT block are BAT blocks 109 through 236, the BAT
blocks enumerated in the second XBAT block are BAT
blocks 237 through 364, and so on.</p>
<p>Through the use of XBAT blocks, the limit on the
overall document size is that imposed by the 4-byte
block indices; if the indices are unsigned ints, the
maximum file size is 2 terabytes, 1 terabyte if the
indices are treated as signed ints. Either way, I have
yet to see a disk drive large enough to accommodate
such a file on the shelves at the local office supply
stores.</p>
</section>
<section title="SBATs">
<p>If a file contained in a POIFS archive is smaller than
4096 bytes, it is stored in small blocks. Small blocks
are 64 bytes in length and are contained within big
blocks, up to 8 to a big block. As the main BAT is used
to navigate the array of big blocks, so the <b>small
block allocation table</b> is used to navigate the
array of small blocks. The SBAT's start block index is
found at offset <b>0x3C</b> of the header block, and
remaining blocks constituting the SBAT are found by
walking the main BAT as if it were an ordinary file in
the POIFS file system (this process is described
below).</p>
</section>
<section title="Property Table Start Index">
<p>An integer at address <b>0x30</b> specifies the start
index of the property table. This integer is specified
as a <b>&quot;block index&quot;</b>. The Property Table
is stored, as is almost everything in a POIFS file
system, in big blocks and walked via the BAT. The
Property Table is described below.</p>
</section>
</section>
<section title="Property Table">
<p>The property table is essentially nothing more than the
directory system. Properties are 128 byte records
contained within the 512 byte blocks. The first property
is always the Root Entry. The following applies to
individual properties within a property table:</p>
<ul>
<li>At offset <b>0x00</b> in the property is the
&quot;<b>name</b>&quot;. This is stored as an
uncompressed 16 bit unicode string. In short every
other byte corresponds to an &quot;ASCII&quot;
character. The size of this string is stored at offset
<b>0x40</b> (<b>string size</b>) as a short.</li>
<li>At offset <b>0x42</b> is the <b>property type</b>
(byte). The type is 1 for directory, 2 for file or 5
for the Root Entry.</li>
<li>At offset <b>0x43</b> is the <b>node color</b>
(byte). The color is either 1, (black), or 0,
(red). Properties are apparently meant to be arranged
in a red-black binary tree, subject to the following
rules:
<ol>
<li>The root of the tree is always black</li>
<li>Two consecutive nodes cannot both be red</li>
<li>A property is less than another property if its
name length is less than the other property's name
length</li>
<li>If two properties have the same name length, the
sort order is determined by the sort order of the
properties' names.</li>
</ol></li>
<li>At offset <b>0x44</b> is the index (int) of the
<b>previous property</b>.</li>
<li>At offset <b>0x48</b> is the index (int) of the
<b>next property</b>.</li>
<li>At offset <b>0x4C</b> is the index (int) of the
<b>first directory entry</b>. This is used by
directory entries.</li>
<li>At offset <b>0x74</b> is an integer giving the
<b>start block</b> for the file described by this
property. This index corresponds to an index in the
array of indices that is the Block Allocation Table
(or the Small Block Allocation Table) as well as the
index of the first block in the file. This is used by
files and the root entry.</li>
<li>At offset <b>0x78</b> is an integer giving the total
<b>actual size</b> of the file pointed at by this
property. If the file size is less than 4096, the file
is stored in small blocks and the SBAT is used to walk
the small blocks making up the file. If the file size
is 4096 or larger, the file is stored in big blocks
and the main BAT is used to walk the big blocks making
up the file. The exception to this rule is the <b>Root
Entry</b>, which, regardless of its size, is
<b>always</b> stored in big blocks and the main BAT is
used to walk the big blocks making up this special
file.</li>
</ul>
</section>
<section title="Root Entry">
<p>The <b>Root Entry</b> in the <b>Property Table</b>
contains the information necessary to read and write
small files, which are files less than 4096 bytes
long. The start block field of the Root Entry is the
start index of the <b>Small Block Array</b>, which is
read like any other file in the POIFS file system. Since
the SBAT cannot be used without the Small Block Array,
the Root Entry MUST be read or written using the <b>Block
Allocation Table</b>. The blocks making up the Small
Block Array are divided into 64-byte small blocks, up to
the size indicated in the Root Entry (which should always
be a multiple of 64).</p>
</section>
<section title="Walking the Nodes of the Property Table">
<p>The individual properties form a directory tree, with the
<b>Root Entry</b> as the directory tree's root, as shown
in the accompanying drawing. Note the numbers in
parentheses in each node; they represent the node's index
in the array of properties. The <b>NEXT_PROP</b>,
<b>PREVIOUS_PROP</b>, and <b>CHILD_PROP</b> fields hold
these indices, and are used to navigate the tree.</p>
<img src="images/PropertySet.jpg" />
<p>Each directory entry (i.e., a property whose type is
<b>directory</b> or <b>root entry</b>) uses its
<b>CHILD_PROP</b> field to point to one of its
subordinate (child) properties. It doesn't seem to matter
which of its children it points to. Thus in the previous
drawing, the Root Entry's CHILD_PROP field may contain 1,
4, or the index of one of its other children. Similarly,
the directory node (index 1) may have, in its CHILD_PROP
field, 2, 3, or the index of one of its other
children.</p>
<p>The children of a given directory property point to each
other in a similar fashion by using their
<b>NEXT_PROP</b> and <b>PREVIOUS_PROP</b> fields.</p>
<p>Unused <b>NEXT_PROP</b>, <b>PREVIOUS_PROP</b>, and
<b>CHILD_PROP</b> fields contain the marker value of
-1. All file properties have a value of -1 for their
CHILD_PROP fields for example.</p>
</section>
<section title="Block Allocation Table">
<p>The <b>BAT blocks</b> are pointed at by the bat array
contained in the header and supplemented, if necessary,
by the <b>XBAT blocks</b>. These blocks form a large
table of integers. These integers are block numbers. The
<b>Block Allocation Table</b> holds chains of integers.
These chains are terminated with -2. The elements in
these chains refer to blocks in the files. The starting
block of a file is NOT specified in the BAT. It is
specified by the <b>property</b> for a given file. The
elements in this BAT are both the block number (within
the file minus the header) <b>and</b> the number of the
next BAT element in the chain. This can be thought of as
a linked list of blocks. The BAT array contains the links
from one block to the next, including the end of chain
marker.</p>
<p>Here's an example: Let's assume that the BAT begins as
follows:</p>
<p><code>BAT[ 0 ] = 2</code></p>
<p><code>BAT[ 1 ] = 5</code></p>
<p><code>BAT[ 2 ] = 3</code></p>
<p><code>BAT[ 3 ] = 4</code></p>
<p><code>BAT[ 4 ] = 6</code></p>
<p><code>BAT[ 5 ] = -2</code></p>
<p><code>BAT[ 6 ] = 7</code></p>
<p><code>BAT[ 7 ] = -2</code></p>
<p><code>...</code></p>
<p>Now, if we have a file whose Property Table entry says it
begins with index 0, we walk the BAT array and see that
the file consists of blocks 0 (because the start block is
0), 2 (because BAT[ 0 ] is 2), 3 (BAT[ 2 ] is 3), 4 (BAT[
3 ] is 4), 6 (BAT[ 4 ] is 6), and 7 (BAT[ 6 ] is 7). It
ends at block 7 because BAT[ 7 ] is -2, which is the end
of chain marker.</p>
<p>Similarly, a file beginning at index 1 consists of
blocks 1 and 5.</p>
<p>Other special numbers in a BAT array are:</p>
<ul>
<li>-1, which indicates an unused block</li>
<li>-3, which indicates a &quot;special&quot; block, such
as a block used to make up the Small Block Array, the
Property Table, the main BAT, or the SBAT</li>
</ul>
</section>
<section title="File System Structures">
<p>The following outlines the basic file system structures.</p>
<section title="Header (block 1) -- 512 (0x200) bytes">
<table>
<tr>
<td><b>Field</b></td>
<td><b>Description</b></td>
<td><b>Offset</b></td>
<td><b>Length</b></td>
<td><b>Default value or const</b></td>
</tr>
<tr>
<td>FILETYPE</td>
<td>Magic number identifying this as a POIFS file
system.</td>
<td>0x0000</td>
<td>Long</td>
<td>0xE11AB1A1E011CFD0</td>
</tr>
<tr>
<td>UK1</td>
<td>Unknown constant</td>
<td>0x0008</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>UK2</td>
<td>Unknown Constant</td>
<td>0x000C</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>UK3</td>
<td>Unknown Constant</td>
<td>0x0014</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>UK4</td>
<td>Unknown Constant (revision?)</td>
<td>0x0018</td>
<td>Short</td>
<td>0x003B</td>
</tr>
<tr>
<td>UK5</td>
<td>Unknown Constant (version?)</td>
<td>0x001A</td>
<td>Short</td>
<td>0x0003</td>
</tr>
<tr>
<td>UK6</td>
<td>Unknown Constant</td>
<td>0x001C</td>
<td>Short</td>
<td>-2</td>
</tr>
<tr>
<td>LOG_2_BIG_BLOCK_SIZE</td>
<td>Log, base 2, of the big block size</td>
<td>0x001E</td>
<td>Short</td>
<td>9 (2 ^ 9 = 512 bytes)</td>
</tr>
<tr>
<td>LOG_2_SMALL_BLOCK_SIZE</td>
<td>Log, base 2, of the small block size</td>
<td>0x0020</td>
<td>Integer</td>
<td>6 (2 ^ 6 = 64 bytes)</td>
</tr>
<tr>
<td>UK7</td>
<td>Unknown Constant</td>
<td>0x0024</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>UK8</td>
<td>Unknown Constant</td>
<td>0x0028</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>BAT_COUNT</td>
<td>Number of elements in the BAT array</td>
<td>0x002C</td>
<td>Integer</td>
<td>required</td>
</tr>
<tr>
<td>PROPERTIES_START</td>
<td>Block index of the first block of the property
table</td>
<td>0x0030</td>
<td>Integer</td>
<td>required</td>
</tr>
<tr>
<td>UK9</td>
<td>Unknown Constant</td>
<td>0x0034</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>UK10</td>
<td>Unknown Constant</td>
<td>0x0038</td>
<td>Integer</td>
<td>0x00001000</td>
</tr>
<tr>
<td>SBAT_START</td>
<td>Block index of first big block containing the small
block allocation table (SBAT)</td>
<td>0x003C</td>
<td>Integer</td>
<td>-2</td>
</tr>
<tr>
<td>SBAT_Block_Count</td>
<td>Number of big blocks holding the SBAT</td>
<td>0x0040</td>
<td>Integer</td>
<td>1</td>
</tr>
<tr>
<td>XBAT_START</td>
<td>Block index of the first block in the Extended Block
Allocation Table (XBAT)</td>
<td>0x0044</td>
<td>Integer</td>
<td>-2</td>
</tr>
<tr>
<td>XBAT_COUNT</td>
<td>Number of elements in the Extended Block Allocation
Table (to be added to the BAT)</td>
<td>0x0048</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>BAT_ARRAY</td>
<td>Array of block indices constituting the Block
Allocation Table (BAT)</td>
<td>0x004C, 0x0050, 0x0054 ... 0x01FC</td>
<td>Integer[]</td>
<td>-1 for unused elements, at least first element must
be filled.</td>
</tr>
<tr>
<td>N/A</td>
<td>Header block data not otherwise described in this
table</td>
<td>N/A</td>
<td>N/A</td>
<td>-1</td>
</tr>
</table>
</section>
<section title="Block Allocation Table Block -- 512 (0x200) bytes">
<table>
<tr>
<td><B>Field</B></td>
<td><B>Description</B></td>
<td><B>Offset</B></td>
<td><B>Length</B></td>
<td><B>Default value or const</B></td>
</tr>
<tr>
<td>BAT_ELEMENT</td>
<td>Any given element in the BAT block</td>
<td>0x0000, 0x0004, 0x0008, ... 0x01FC</td>
<td>Integer</td>
<td>
<ul>
<li>-1 = unused</li>
<li>-2 = end of chain</li>
<li>-3 = special (e.g., BAT block)</li>
</ul>
<p>All other values point to the next element in the
chain and the next index of a block composing the
file.</p>
</td>
</tr>
</table>
</section>
<section title="Property Block -- 512 (0x200) byte block">
<table>
<tr>
<td><B>Field</B></td>
<td><B>Description</B></td>
<td><B>Offset</B></td>
<td><B>Length</B></td>
<td><B>Default value or const</B></td>
</tr>
<tr>
<td>Properties[]</td>
<td>This block contains the properties.</td>
<td>0x0000, 0x0080, 0x0100, 0x0180</td>
<td>128 bytes</td>
<td>All unused space is set to -1.</td>
</tr>
</table>
</section>
<section title="Property -- 128 (0x80) byte block">
<table>
<tr>
<td><B>Field</B></td>
<td><B>Description</B></td>
<td><B>Offset</B></td>
<td><B>Length</B></td>
<td><B>Default value or const</B></td>
</tr>
<tr>
<td>NAME</td>
<td>A unicode null-terminated uncompressed 16bit string
(lose the high bytes) containing the name of the
property.</td>
<td>0x00, 0x02, 0x04, ... 0x3E</td>
<td>Short[]</td>
<td>0x0000 for unused elements, field required, 32
(0x40) element max</td>
</tr>
<tr>
<td>NAME_SIZE</td>
<td>Number of characters in the NAME field</td>
<td>0x40</td>
<td>Short</td>
<td>Required</td>
</tr>
<tr>
<td>PROPERTY_TYPE</td>
<td>Property type (directory, file, or root)</td>
<td>0x42</td>
<td>Byte</td>
<td>1 (directory), 2 (file), or 5 (root entry)</td>
</tr>
<tr>
<td>NODE_COLOR</td>
<td>Node color</td>
<td>0x43</td>
<td>Byte</td>
<td>0 (red) or 1 (black)</td>
</tr>
<tr>
<td>PREVIOUS_PROP</td>
<td>Previous property index</td>
<td>0x44</td>
<td>Integer</td>
<td>-1</td>
</tr>
<tr>
<td>NEXT_PROP</td>
<td>Next property index</td>
<td>0x48</td>
<td>Integer</td>
<td>-1</td>
</tr>
<tr>
<td>CHILD_PROP</td>
<td>First child property index</td>
<td>0x4c</td>
<td>Integer</td>
<td>-1</td>
</tr>
<tr>
<td>SECONDS_1</td>
<td>Seconds component of the created timestamp?</td>
<td>0x64</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>DAYS_1</td>
<td>Days component of the created timestamp?</td>
<td>0x68</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>SECONDS_2</td>
<td>Seconds component of the modified timestamp?</td>
<td>0x6C</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>DAYS_2</td>
<td>Days component of the modified timestamp?</td>
<td>0x70</td>
<td>Integer</td>
<td>0</td>
</tr>
<tr>
<td>START_BLOCK</td>
<td>Starting block of the file, used as the first block
in the file and the pointer to the next block from
the BAT</td>
<td>0x74</td>
<td>Integer</td>
<td>Required</td>
</tr>
<tr>
<td>SIZE</td>
<td>Actual size of the file this property points
to. (used to truncate the blocks to the real
size).</td>
<td>0x78</td>
<td>Integer</td>
<td>0</td>
</tr>
</table>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>How To Use the POIFS APIs</title>
<authors>
<person email="mjohnson@apache.org" name="Marc Johnson" id="MJ"/>
</authors>
</header>
<body>
<section title="How To Use the POIFS APIs">
<p>This document describes how to use the POIFS APIs to read, write, and modify files that employ a POIFS-compatible data structure to organize their content.</p>
<section title="Revision History">
<ul>
<li>02.10.2002 - completely rewritten from original documents on <link href="https://sourceforge.net/cvs/?group_id=32701">sourceforge</link></li>
</ul>
</section>
<section title="Target Audience">
<p>This document is intended for Java developers who need to use the POIFS APIs to read, write, or modify files that employ a POIFS-compatible data structure to organize their content. It is not necessary for developers to understand the POIFS data structures, and an explanation of those data structures is beyond the scope of this document. It is expected that the members of the target audience will understand the rudiments of a hierarchical file system, and familiarity with the event pattern employed by Java APIs such as AWT would be helpful.</p>
</section>
<section title="Glossary">
<p>This document attempts to be consistent in its terminology, which is defined here:</p>
<table>
<tr>
<td><b>Term</b></td>
<td><b>Definition</b></td>
</tr>
<tr>
<td>Directory</td>
<td>A special file that may contain other directories and documents.</td>
</tr>
<tr>
<td>DirectoryEntry</td>
<td>Representation of a directory within another directory.</td>
</tr>
<tr>
<td>Document</td>
<td>A file containing data, such as word processing data or a spreadsheet workbook.</td>
</tr>
<tr>
<td>DocumentEntry</td>
<td>Representation of a document within a directory.</td>
</tr>
<tr>
<td>Entry</td>
<td>Representation of a file in a directory.</td>
</tr>
<tr>
<td>File</td>
<td>A named entity, managed and contained by the file system.</td>
</tr>
<tr>
<td>File System</td>
<td>The POIFS data structures, plus the contained directories and documents, which are maintained in a hierarchical directory structure.</td>
</tr>
<tr>
<td>Root Directory</td>
<td>The directory at the base of a file system. All file systems have a root directory. The POIFS APIs will not allow the root directory to be removed or renamed, but it can be accessed for the purpose of reading its contents or adding files (directories and documents) to it.</td>
</tr>
</table>
</section>
</section>
<section title="Reading a File System">
<p>This section covers reading a file system. There are two ways to read a file system; these techniques are sketched out in the following table, and then explained in greater depth in the sections following the table.</p>
<table>
<tr>
<td><b>Technique</b></td>
<td><b>Advantages</b></td>
<td><b>Disadvantages</b></td>
</tr>
<tr>
<td>Conventional Reading</td>
<td>
<ul>
<li>Simpler API similar to reading a conventional file system.</li>
<li>Can read documents in any order.</li>
</ul>
</td>
<td>
<ul>
<li>All files are resident in memory, whether your application needs them or not.</li>
</ul>
</td>
</tr>
<tr>
<td>Event-Driven Reading</td>
<td>
<ul>
<li>Reduced footprint -- only the documents you care about are processed.</li>
<li>Improved performance -- no time is wasted reading the documents you're not interested in.</li>
</ul>
</td>
<td>
<ul>
<li>More complicated API.</li>
<li>Need to know in advance which documents you want to read.</li>
<li>No control over the order in which the documents are read.</li>
<li>No way to go back and get additional documents except to re-read the file system, which may not be possible, e.g., if the file system is being read from an input stream that lacks random access support.</li>
</ul>
</td>
</tr>
</table>
<section title="Conventional Reading">
<p>In this technique for reading, the entire file system is loaded into memory, and the entire directory tree can be walked by an application, reading specific documents at the application's leisure.</p>
<section title="Preparation">
<p>Before an application can read a file from the file system, the file system needs to be loaded into memory. This is done by using the <code>org.apache.poi.poifs.filesystem.POIFSFileSystem</code> class. Once the file system has been loaded into memory, the application may need the root directory. The following code fragment will accomplish this preparation stage:</p>
<source>
// need an open InputStream; for a file-based system, this would be appropriate:
// InputStream stream = new FileInputStream(fileName);
POIFSFileSystem fs;
try
{
fs = new POIFSFileSystem(inputStream);
}
catch (IOException e)
{
// an I/O error occurred, or the InputStream did not provide a compatible
// POIFS data structure
}
DirectoryEntry root = fs.getRoot();</source>
<p>Assuming no exception was thrown, the file system can then be read.</p>
<p>Note: loading the file system can take noticeable time, particularly for large file systems.</p>
</section>
<section title="Reading the Directory Tree">
<p>Once the file system has been loaded into memory and the root directory has been obtained, the root directory can be read. The following code fragment shows how to read the entries in an <code>org.apache.poi.poifs.filesystem.DirectoryEntry</code> instance:</p>
<source>
// dir is an instance of DirectoryEntry ...
for (Iterator iter = dir.getEntries(); iter.hasNext(); )
{
Entry entry = (Entry)iter.next();
System.out.println("found entry: " + entry.getName());
if (entry instanceof DirectoryEntry)
{
// .. recurse into this directory
}
else if (entry instanceof DocumentEntry)
{
// entry is a document, which you can read
}
else
{
// currently, either an Entry is a DirectoryEntry or a DocumentEntry,
// but in the future, there may be other entry subinterfaces. The
// internal data structure certainly allows for a lot more entry types.
}
}</source>
</section>
<section title="Reading a Specific Document">
<p>There are a couple of ways to read a document, depending on whether the document resides in the root directory or in another directory. Either way, you will obtain an <code>org.apache.poi.poifs.filesystem.DocumentInputStream</code> instance.</p>
<section title="DocumentInputStream">
<p>The DocumentInputStream class is a simple implementation of InputStream that makes a few guarantees worth noting:</p>
<ul>
<li><code>available()</code> always returns the number of bytes in the document from your current position in the document.</li>
<li><code>markSupported()</code> returns <code>true</code>.</li>
<li><code>mark(int limit)</code> ignores the limit parameter; basically the method marks the current position in the document.</li>
<li><code>reset()</code> takes you back to the position when <code>mark()</code> was last called, or to the beginning of the document if <code>mark()</code> has not been called.</li>
<li><code>skip(long n)</code> will take you to your current position + n (but not past the end of the document).</li>
</ul>
<p>The behavior of <code>available</code> means you can read in a document in a single read call like this:</p>
<source>
byte[] content = new byte[ stream.available() ];
stream.read(content);
stream.close();</source>
<p>The combination of <code>mark</code>, <code>reset</code>, and <code>skip</code> provide the basic mechanisms needed for random access of the document contents.</p>
</section>
<section title="Reading a Document From the Root Directory">
<p>If the document resides in the root directory, you can obtain a <code>DocumentInputStream</code> like this:</p>
<source>
// load file system
try
{
DocumentInputStream stream = filesystem.createDocumentInputStream(documentName);
// process data from stream
}
catch (IOException e)
{
// no such document, or the Entry represented by documentName is not a
// DocumentEntry
}</source>
</section>
<section title="Reading a Document From an Arbitrary Directory">
<p>A more generic technique for reading a document is to obtain an <code>org.apache.poi.poifs.filesystem.DirectoryEntry</code> instance for the directory containing the desired document (recall that you can use <code>getRoot()</code> to obtain the root directory from its file system). From that DirectoryEntry, you can then obtain a <code>DocumentInputStream</code> like this:</p>
<source>
DocumentEntry document = (DocumentEntry)directory.getEntry(documentName);
DocumentInputStream stream = new DocumentInputStream(document);
</source>
</section>
</section>
</section>
<section title="Event-Driven Reading">
<p>The event-driven API for reading documents is a little more complicated and requires that your application know, in advance, which files it wants to read. The benefit of using this API is that each document is in memory just long enough for your application to read it, and documents that you never read at all are not in memory at all. When you're finished reading the documents you wanted, the file system has no data structures associated with it at all and can be discarded.</p>
<section title="Preparation">
<p>The preparation phase involves creating an instance of <code>org.apache.poi.poifs.eventfilesystem.POIFSReader</code> and to then register one or more <code>org.apache.poi.poifs.eventfilesystem.POIFSReaderListener</code> instances with the <code>POIFSReader</code>.</p>
<source>
POIFSReader reader = new POIFSReader();
// register for everything
reader.registerListener(myOmnivorousListener);
// register for selective files
reader.registerListener(myPickyListener, "foo");
reader.registerListener(myPickyListener, "bar");
// register for selective files
reader.registerListener(myOtherPickyListener, new POIFSDocumentPath(),
"fubar");
reader.registerListener(myOtherPickyListener, new POIFSDocumentPath(
new String[] { "usr", "bin" ), "fubar");</source>
</section>
<section title="POIFSReaderListener">
<p><code>org.apache.poi.poifs.eventfilesystem.POIFSReaderListener</code> is an interface used to register for documents. When a matching document is read by the <code>org.apache.poi.poifs.eventfilesystem.POIFSReader</code>, the <code>POIFSReaderListener</code> instance receives an <code>org.apache.poi.poifs.eventfilesystem.POIFSReaderEvent</code> instance, which contains an open <code>DocumentInputStream</code> and information about the document.</p>
<p>A <code>POIFSReaderListener</code> instance can register for individual documents, or it can register for all documents; once it has registered for all documents, subsequent (and previous!) registration requests for individual documents are ignored. There is no way to unregister a <code>POIFSReaderListener</code>.</p>
<p>Thus, it is possible to register a single <code>POIFSReaderListener</code> for multiple documents - one, some, or all documents. It is guaranteed that a single <code>POIFSReaderListener</code> will receive exactly one notification per registered document. There is no guarantee as to the order in which it will receive notification of its documents, as future implementations of <code>POIFSReader</code> are free to change the algorithm for walking the file system's directory structure.</p>
<p>It is also permitted to register more than one <code>POIFSReaderListener</code> for the same document. There is no guarantee of ordering for notification of <code>POIFSReaderListener</code> instances that have registered for the same document when <code>POIFSReader</code> processes that document.</p>
<p>It is guaranteed that all notifications occur in the same thread. A future enhancement may be made to provide multi-threaded notifications, but such an enhancement would very probably be made in a new reader class, a <code>ThreadedPOIFSReader</code> perhaps.</p>
<p>The following table describes the three ways to register a <code>POIFSReaderListener</code> for a document or set of documents:</p>
<table>
<tr>
<td><b>Method Signature</b></td>
<td><b>What it does</b></td>
</tr>
<tr>
<td>registerListener(POIFSReaderListener <b>listener</b>)</td>
<td>registers <b>listener</b> for all documents.</td>
</tr>
<tr>
<td>registerListener(POIFSReaderListener <b>listener</b>, String <b>name</b>)</td>
<td>registers <b>listener</b> for a document with the specified <b>name</b> in the root directory.</td>
</tr>
<tr>
<td>registerListener(POIFSReaderListener <b>listener</b>, POIFSDocumentPath <b>path</b>, String <b>name</b>)</td>
<td>registers <b>listener</b> for a document with the specified <b>name</b> in the directory described by <b>path</b></td>
</tr>
</table>
</section>
<section title="POIFSDocumentPath">
<p>The <code>org.apache.poi.poifs.filesystem.POIFSDocumentPath</code> class is used to describe a directory in a POIFS file system. Since there are no reserved characters in the name of a file in a POIFS file system, a more traditional string-based solution for describing a directory, with special characters delimiting the components of the directory name, is not feasible. The constructors for the class are used as follows:</p>
<table>
<tr>
<td><b>Constructor example</b></td>
<td><b>Directory described</b></td>
</tr>
<tr>
<td>new POIFSDocumentPath()</td>
<td>The root directory.</td>
</tr>
<tr>
<td>new POIFSDocumentPath(null)</td>
<td>The root directory.</td>
</tr>
<tr>
<td>new POIFSDocumentPath(new String[ 0 ])</td>
<td>The root directory.</td>
</tr>
<tr>
<td>new POIFSDocumentPath(new String[ ] { "foo", "bar"} )</td>
<td>in Unix terminology, "/foo/bar".</td>
</tr>
<tr>
<td>new POIFSDocumentPath(new POIFSDocumentPath(new String[] { "foo" }), new String[ ] { "fu", "bar"} )</td>
<td>in Unix terminology, "/foo/fu/bar".</td>
</tr>
</table>
</section>
<section title="Processing POIFSReaderEvent Events">
<p>Processing <code>org.apache.poi.poifs.eventfilesystem.POIFSReaderEvent</code> events is relatively easy. After all of the <code>POIFSReaderListener</code> instances have been registered with <code>POIFSReader</code>, the <code>POIFSReader.read(InputStream stream)</code> method is called.</p>
<p>Assuming that there are no problems with the data, as the <code>POIFSReader</code> processes the documents in the specified <code>InputStream</code>'s data, it calls registered <code>POIFSReaderListener</code> instances' <code>processPOIFSReaderEvent</code> method with a <code>POIFSReaderEvent</code> instance.</p>
<p>The <code>POIFSReaderEvent</code> instance contains information to identify the document (a <code>POIFSDocumentPath</code> object to identify the directory that the document is in, and the document name), and an open <code>DocumentInputStream</code> instance from which to read the document.</p>
</section>
</section>
</section>
<section title="Writing a File System">
<p>Writing a file system is very much like reading a file system in that there are multiple ways to do so. You can load an existing file system into memory and modify it (removing files, renaming files) and/or add new files to it, and write it, or you can start with a new, empty file system:</p>
<source>
POIFSFileSystem fs = new POIFSFileSystem();</source>
<section title="The Naming of Names">
<p>There are two restrictions on the names of files in a file system that must be considered when creating files:</p>
<ol>
<li>The name of the file must not exceed 31 characters. If it does, the POIFS API will silently truncate the name to fit.</li>
<li>The name of the file must be unique within its containing directory. This seems pretty obvious, but if it isn't spelled out, there'll be hell to pay, to be sure. Uniqueness, of course, is determined <b>after</b> the name has been truncated, if the original name was too long to begin with.</li>
</ol>
</section>
<section title="Creating a Document">
<p>A document can be created by acquiring a <code>DirectoryEntry</code> and calling one of the two <code>createDocument</code> methods:</p>
<table>
<tr>
<td><b>Method Signature</b></td>
<td><b>Advantages</b></td>
<td><b>Disadvantages</b></td>
</tr>
<tr>
<td>CreateDocument(String name, InputStream stream)</td>
<td>
<ul>
<li>Simple API.</li>
</ul>
</td>
<td>
<ul>
<li>Increased memory footprint (document is in memory until file system is written).</li>
</ul>
</td>
</tr>
<tr>
<td>CreateDocument(String name, int size, POIFSWriterListener writer)</td>
<td>
<ul>
<li>Decreased memory footprint (only very small documents are held in memory, and then only for a short time).</li>
</ul>
</td>
<td>
<ul>
<li>More complex API.</li>
<li>Determining document size in advance may be difficult.</li>
<li>Lose control over when document is to be written.</li>
</ul>
</td>
</tr>
</table>
<p>Unlike reading, you don't have to choose between the in-memory and event-driven writing models; both can co-exist in the same file system.</p>
<p>Writing is initiated when the <code>POIFSFileSystem</code> instance's <code>writeFilesystem()</code> method is called with an <code>OutputStream</code> to write to.</p>
<p>The event-driven model is quite similar to the event-driven model for reading, in that the file system calls your <code>org.apache.poi.poifs.filesystem.POIFSWriterListener</code> when it's time to write your document, just as the <code>POIFSReader</code> calls your <code>POIFSReaderListener</code> when it's time to read your document. Internally, when <code>writeFilesystem()</code> is called, the final POIFS data structures are created and are written to the specified <code>OutputStream</code>. When the file system needs to write a document out that was created with the event-driven model, it calls the <code>POIFSWriterListener</code> back, calling its <code>processPOIFSWriterEvent()</code> method, passing an <code>org.apache.poi.poifs.filesystem.POIFSWriterEvent</code> instance. This object contains the <code>POIFSDocumentPath</code> and name of the document, its size, and an open <code>org.apache.poi.poifs.filesystem.DocumentOutputStream</code> to which to write. A <code>DocumentOutputStream</code> is a wrapper over the <code>OutputStream</code> that was provided to the <code>POIFSFileSystem</code> to write to, and has the responsibility of making sure that the document your application writes fits within the size you specified for it.</p>
</section>
<section title="Creating a Directory">
<p>Creating a directory is similar to creating a document, except that there's only one way to do so:</p>
<source>
DirectoryEntry createdDir = existingDir.createDirectory(name);</source>
</section>
<section title="Using POIFSFileSystem Directly To Create a Document Or Directory">
<p>As with reading documents, it is possible to create a new document or directory in the root directory by using convenience methods of POIFSFileSystem.</p>
<table>
<tr>
<td>DirectoryEntry Method Signature</td>
<td>POIFSFileSystem Method Signature</td>
</tr>
<tr>
<td>createDocument(String name, InputStream stream)</td>
<td>createDocument(InputStream stream, String name)</td>
</tr>
<tr>
<td>createDocument(String name, int size, POIFSWriterListener writer)</td>
<td>createDocument(String name, int size, POIFSWriterListener writer)</td>
</tr>
<tr>
<td>createDirectory(String name)</td>
<td>createDirectory(String name)</td>
</tr>
</table>
</section>
</section>
<section title="Modifying a File System">
<p>It is possible to modify an existing POIFS file system, whether it's one your application has loaded into memory, or one which you are creating on the fly.</p>
<section title="Removing a Document">
<p>Removing a document is simple: you get the <code>Entry</code> corresponding to the document and call its <code>delete()</code> method. This is a boolean method, but should always return <code>true</code>, indicating that the operation succeeded.</p>
</section>
<section title="Removing a Directory">
<p>Removing a directory is also simple: you get the <code>Entry</code> corresponding to the directory and call its <code>delete()</code> method. This is a boolean method, but, unlike deleting a document, may not always return <code>true</code>, indicating that the operation succeeded. Here are the reasons why the operation may fail:</p>
<ul>
<li>The directory still has files in it (to check, call <code>isEmpty()</code> on its DirectoryEntry; is the return value <code>false</code>?)</li>
<li>The directory is the root directory. You cannot remove the root directory.</li>
</ul>
</section>
<section title="Renaming a File">
<p>Regardless of whether the file is a directory or a document, it can be renamed, with one exception - the root directory has a special name that is expected by the components of a major software vendor's office suite, and the POIFS API will not let that name be changed. Renaming is done by acquiring the file's corresponding <code>Entry</code> instance and calling its <code>renameTo</code> method, passing in the new name.</p>
<p>Like <code>delete</code>, <code>renameTo</code> returns <code>true</code> if the operation succeeded, otherwise <code>false</code>. Reasons for failure include these:</p>
<ul>
<li>The new name is the same as another file in the same directory. And don't forget - if the new name is longer than 31 characters, it <b>will</b> be silently truncated. In its original length, the new name may have been unique, but truncated to 31 characters, it may not be unique any longer.</li>
<li>You tried to rename the root directory.</li>
</ul>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>PoiFS</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Overview">
<p>POIFS is a pure Java implementation of the OLE 2 Compound
Document format.</p>
<p>By definition, all APIs developed by the POI project are
based somehow on the POIFS API.</p>
<p>A common confusion is on just what POIFS buys you or what OLE
2 Compound Document format is exactly. POIFS does not buy you
DOC, or XLS, but is necessary to generate or read DOC or XLS
files. You see, all file formats based on the OLE 2 Compound
Document Format have a common structure. The OLE 2 Compound
Document Format is essentially a convoluted archive
format. Think of POIFS as a "zip" library. Once you can get
the data in a zip file you still need to interpret the
data. As a general rule, while all of our formats <b>use</b>
POIFS, most of them attempt to abstract you from it. There
are some circumstances where this is not possible, but as a
general rule this is true.</p>
<p>If you're an end user type just looking to generate XLS
files, then you'd be looking for HSSF not POIFS; however, if
you have legacy code that uses MFC property sets, POIFS is
for you! Regardless, you may or may not need to know how to
use POIFS but ultimately if you use technologies that come
from the POI project, you're using POIFS underneith. Perhaps
we should have a branding campaign "POIFS Inside!". ;-)</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>POIFS Use Cases</title>
<authors>
<person email="mjohnson@apache.org" name="Marc Johnson" id="MJ"/>
</authors>
</header>
<body>
<section title="POIFS Use Cases">
<section title="Use Case 1: Read existing file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to read content of file
system</li>
<li>POIFS - understands POIFS file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS client requests POIFS to read a POIFS file
system, providing an <code>InputStream</code>
containing POIFS file system in question.</li>
<li>POIFS reads from the <code>InputStream</code> in
512 byte blocks</li>
<li>POIFS verifies that the first block begins with
the well known signature
(<code>0xE11AB1A1E011CFD0</code>)</li>
<li>POIFS reads the Block Allocation Table from the
first block and, if necessary, from the XBAT
blocks.</li>
<li>POIFS obtains the start block of the Property
Table and reads the Property Table (use case 9,
read file)</li>
<li>POIFS reads the individual entries in the Property
Table</li>
<li>POIFS obtains the start block of the Small Block
Allocation Table and reads the Small Block
Allocation Table (use case 9, read file)</li>
<li>POIFS obtains the start block of the Small Block
store from the first entry in the Property Table
and reads the Small Block Array (use case 9, read
file)</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>
<ul>
<li>2a. If the last block read is not a 512 byte
block, the <code>InputStream</code> is not that of
a POIFS file system, and POIFS throws an
appropriate exception.</li>
<li>3a. If the signature is incorrect, the
<code>InputStream</code> is not that of a POIFS
file system, and POIFS throws an appropriate
exception.</li>
</ul>
</td>
</tr>
</table>
</section>
<section title="Use Case 2: Write file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to write file system out.</li>
<li>POIFS - knows how to write file system out.</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>
<ul>
<li>File system has been read (use case 1, read
existing file system) and subsequently modified
(use case 4, replace file in file system; use case
5, delete file from file system; or use case 6,
write new file to file system; in any
combination)</li>
</ul>
<p>or</p>
<ul>
<li>File system has been created (use case 3, create
new file system)</li>
</ul>
</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS client provides an <code>OutputStream</code>
to write the file system to.</li>
<li>POIFS gets the sizes of the Property Table and
each file in the file system.</li>
<li>If any files in the file system requires storage
in a Small Block Array, POIFS creates a Small
Block Array of sufficient size to hold all of the
small files.</li>
<li>POIFS calculates the number of big blocks needed
to hold all of the large files, the Property
Table, and, if necessary, the Small Block Array
and the Small Block Allocation Table.</li>
<li>POIFS creates a set of big blocks sufficient to
store the Block Allocation Table</li>
<li>POIFS creates and writes the header block</li>
<li>POIFS writes out the XBAT blocks, if needed.</li>
<li>POIFS writes out the Small Block Array, if
needed</li>
<li>POIFS writes out the Small Block Allocation Table,
if needed</li>
<li>POIFS writes out the Property Table</li>
<li>POIFS writes out the large files, if needed</li>
<li>POIFS closes the <code>OutputStream</code>.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>
<ul>
<li>6a. Exceptions writing to the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
<li>7a. Exceptions writing to the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
<li>8a. Exceptions writing to the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
<li>9a. Exceptions writing to the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
<li>10a. Exceptions writing to the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
<li>11a. Exceptions writing to the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
<li>12a. Exceptions closing the
<code>OutputStream</code> will be propagated back
to the POIFS client.</li>
</ul>
</td>
</tr>
</table>
</section>
<section title="Use Case 3: Create new file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to create a new file
system</li>
<li>POIFS - knows how to create a new file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS creates an empty Property Table.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>None</td>
</tr>
</table>
</section>
<section title="Use Case 4: Replace file in file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to replace an existing file in
the file system</li>
<li>POIFS - knows how to manage the file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>
<p>Either</p>
<ul>
<li>The file system has been read (use case 1, read
existing file system) and a file has been
extracted from the file system (use case 7, read
existing file from file system)</li>
</ul>
<p>or</p>
<ul>
<li>The file system has been created (use case 3,
create new file system) and a file has been
written to the file system (use case 6, write new
file to file system)</li>
</ul>
</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS discards storage of the existing file.</li>
<li>POIFS updates the existing file's entry in the
Property Table</li>
<li>POIFS stores the new file's data</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>
<ul>
<li>1a. POIFS throws an exception if the file does not
exist.</li>
</ul>
</td>
</tr>
</table>
</section>
<section title="Use Case 5: Delete file from file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to remove a file from a file
system</li>
<li>POIFS - knows how to manage the file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>
<p>Either</p>
<ul>
<li>The file system has been read (use case 1, read
existing file system) and a file has been
extracted from the file system (use case 7, read
existing file from file system)</li>
</ul>
<p>or</p>
<ul>
<li>The file system has been created (use case 3,
create new file system) and a file has been
written to the file system (use case 6, write new
file to file system)</li>
</ul>
</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS discards the specified file's storage.</li>
<li>POIFS discards the file's Property Table
entry.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>
<ul>
<li>1a. POIFS throws an exception if the file does not
exist.</li>
</ul>
</td>
</tr>
</table>
</section>
<section title="Use Case 6: Write new file to file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to add a new file to the file
system</li>
<li>POIFS - knows how to manage the file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>The specified file does not yet exist in the file
system</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>The POIFS client provides a file name</li>
<li>POIFS creates a new Property Table entry for the
new file</li>
<li>POIFS provides the POIFS client with an
<code>OutputStream</code> to write to.</li>
<li>The POIFS client writes data to the provided
<code>OutputStream</code>.</li>
<li>The POIFS client closes the provided
<code>OutputStream</code></li>
<li>POIFS updates the Property Table entry with the
new file's size</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>
<ul>
<li>1a. POIFS throws an exception if a file with the
specified name already exists in the file
system.</li>
<li>1b. POIFS throws an exception if the file name is
too long. The limit on file name length is 31
characters.</li>
</ul>
</td>
</tr>
</table>
</section>
<section title="Use Case 7: Read existing file from file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to read a file from the file
system</li>
<li>POIFS - knows how to manage the file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>
<ul>
<li>The file system has been read (use case 1, read
existing file system) or has been created and
written to (use case 3, create new file system;
use case 6, write new file to file system).</li>
<li>The specified file exists in the file system.</li>
</ul>
</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>The POIFS client provides the name of a file to be
read</li>
<li>POIFS provides an <code>InputStream</code> to read
from.</li>
<li>The POIFS client reads from the
<code>InputStream</code>.</li>
<li>The POIFS client closes the
<code>InputStream</code>.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>1a. POIFS throws an exception if no file with the
specified name exists.</td>
</tr>
</table>
</section>
<section title="Use Case 8: Read file system directory">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to know what files exist in
the file system</li>
<li>POIFS - knows how to manage the file system</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>The file system has been read (use case 1, read
existing file system) or created (use case 3, create
new file system)</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>The POIFS client requests the file system
directory.</li>
<li>POIFS returns an <code>Iterator</code>. The
<code>Iterator</code> will not include the root
entry in the Property Table, and may be an
<code>Iterator</code> over an empty
<code>Collection</code>.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>None</td>
</tr>
</table>
</section>
<section title="Use Case 9: Read file">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS - POIFS needs to read a file, or something
resembling a file (i.e., the Property Table, the
Small Block Array, or the Small Block Allocation
Table)</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS begins with a start block, a file size, and
a flag indicating whether to use the Big Block
Allocation Table or the Small Block Allocation
Table</li>
<li>POIFS returns an <code>InputStream</code>.</li>
<li>Reads from the <code>InputStream</code> are
performed by walking the specified Block
Allocation Table and reading the blocks
indicated.</li>
<li>POIFS closes the <code>InputStream</code> when
finished reading the file, or its client wants to
close the <code>InputStream</code>.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>3a. An exception will be thrown if the specified Block
Allocation Table is corrupt, as evidenced by an index
pointing to a non-existent block, or by a chain
extending past the known size of the file.</td>
</tr>
</table>
</section>
<section title="Use Case 10: Rename existing file in the file system">
<table>
<tr>
<td><B>Primary Actor:</B></td>
<td>POIFS client</td>
</tr>
<tr>
<td><B>Scope:</B></td>
<td>POIFS</td>
</tr>
<tr>
<td><B>Level:</B></td>
<td>Summary</td>
</tr>
<tr>
<td><B>Stakeholders and Interests:</B></td>
<td>
<ul>
<li>POIFS client- wants to rename an existing file in
the file system.</li>
<li>POIFS - knows how to manage the file system.</li>
</ul>
</td>
</tr>
<tr>
<td><B>Precondition:</B></td>
<td>
<ul>
<li>The file system is has been read (use case 1, read
existing file system) or has been created and
written to (use case 3, create new file system;
use case 6, write new file to file system.</li>
<li>The specified file exists in the file system.</li>
<li>The new name for the file does not duplicate
another file in the file system.</li>
</ul>
</td>
</tr>
<tr>
<td><B>Minimal Guarantee:</B></td>
<td>None</td>
</tr>
<tr>
<td><B>Main Success Guarantee:</B></td>
<td>
<ol>
<li>POIFS updates the Property Table entry for the
specified file with its new name.</li>
</ol>
</td>
</tr>
<tr>
<td><B>Extensions:</B></td>
<td>
<ul>
<li>1a. If the old file name is not in the file
system, POIFS throws an exception.</li>
<li>1b. If the new file name already exists in the
file system, POIFS throws an exception.</li>
<li>1c. If the new file name is too long (the limit is
31 characters), POIFS throws an exception.</li>
</ul>
</td>
</tr>
</table>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "./dtd/book-cocoon-v10.dtd">
<book software="Poi"
title="Poi Project Documentation"
copyright="@year@ Poi Project"
xmlns:xlink="http://www.w3.org/1999/xlink">
<menu label="References">
<menu-item label="Live Sites" href="index.html"/>
<menu-item label="XLS spec [PDF]" href="http://sc.openoffice.org/excelfileformat.pdf"/>
<menu-item label="Apache Cocoon" href="http://xml.apache.org/cocoon/"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Live Sites using Poi</title>
<authors>
<person name="Donald Ball" email="balld@webslingerZ.com"/>
<person name="Stefano Mazzocchi" email="stefano@apache.org"/>
<person name="Robin Green" email="greenrd@hotmail.com"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person name="Glen Stampoultzis" email="glens@apache.org"/>
</authors>
</header>
<body>
<section title="Live Sites using Poi">
<p>Currently we don't have any sites listed that use Poi, but we're sure they're out there.
Help us change this. If you've
written a site that utilises Poi let us know.
</p>
<!--
<ul>
<li><link href=""></link></li>
</ul>
</section>
-->
</section>
<section title="Products/Projects using POI">
<p> Publically available products/projects using POI include:
</p>
<ul>
<li><link href="http://jtimetracker.sourceforge.net/">JTimeTracker</link></li>
</ul>
</section>
</body>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="Resolutions"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
</menu>
<menu label="About">
<menu-item label="About" href="index.html"/>
</menu>
<menu label="Resolutions">
<menu-item label="Coding Standards" href="res001.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Resolutions</title>
<subtitle>About this section</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="About Resolutions">
<p>
Every project on Jakarta has resolutions that they vote on.
Decisions are made, etc. But what happens once those decisions
are made? They are archived in the mail list archive never to
be read again (once its not in the top 10 or so posts). So they
get discussed again and again.
</p>
<p>
Rather than have that big waste of time, we have this section to
record important POI decisions. Once a decision is passed it
need only be linked to this page (either by creating a page for
it or by simply linking it to the archive messages). Wherever
possible a brief about how many votes for and against an maybe
some background should be posted.
</p>
<p>
This section is intended mainly to reduce big waste of time
discussions from taking away from whats important...developing
POI! :-D
</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>POI Resoluton</title>
<subtitle>Resolution 001 - Minimal Coding Standards</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="Resolution 001 - Minimal Coding Standards">
<section title="Majority Position">
<p>
As the POI project has grown the "styles" used have become more
varied, some see this as a bad thing, but in reality it
can be a good thing. Each can learn from the different
styles by working with different code. That being said
there are some universal "good quality" guidelines that
must be adopted on a project of any proportions.
</p>
<p>
Marc Johnson Authored the following resolution:
</p>
<p>
On Tue, 2002-01-08 at 22:23, Marc Johnson wrote:
Standards are wonderful; everyone should have a set.
Here's what I propose for coding standards for POI WRT comments (should I
feel the need, I'll post more of these little gems):
</p>
<ol>
<li>
All classes and interfaces MUST have, right at the beginning, the POI
License (see poi/doc/LICENSE).
</li>
<li>
All classes and interfaces MUST include class javadoc. Conventionally,
this goes after the package and imports, and before the start of the class
or interface. The class javadoc MUST have at least one @author tag
</li>
<li>
All methods that are accessible outside the class MUST have javadoc
comments. In other words, if it isn't private, it MUST have javadoc
comments. Simple getters can consist of a simple @return tag; simple setters
can consist of a simple @param tag. Anything else requires some verbiage
plus all the standard javadoc tags as appropriate. You MUST include @throws
or @exception for any non-runtime exceptions, and you SHOULD document any
runtime exceptions you expect to throw. @throws/@exception tags SHOULD
include an explanation of why that exception would be thrown. If your method
might return null, you MUST say so. An accompanying explanation of the
circumstances for doing so would be nice.
</li>
</ol>
</section>
<section title="Amendments (informal by extension and not by vote)">
<section title="License">
<p>
As opposed to the formerly used POI License which was
based on the Apache Public License, now that POI is part of
Jakarta, use the APL 1.1 for the header. Currently, the
Apache Software Foundation requires us to use the full
long version.
</p>
</section>
<section title="2 cents">
<p>
Tip: No laughing or joking allowed in conversations regarding coding
standards.
Any mail on coding standards will be treated very seriously,
and sent here with a RTFM.
</p>
</section>
</section>
<section title="Dissent">
<p>
The motion was passed unanimously with no negative or
neutral votes.
</p>
</section>
<section title="Comments">
<p>
Andy didn't feel like going through his mail and sucking
out the comments.. If there is anything you feel should
be added here do it yourself ;-).
</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE todo PUBLIC "-//APACHE//DTD Todo V1.1//EN" "./dtd/todo-v11.dtd">
<todo title="Things To Do for Poi">
<devs>
<!-- in strict alphabetical order -->
<person id="AO" name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
<person id="GS" name="Glen Stampoultzis" email="gstamp@iprimus.com.au"/>
<person id="MJ" name="Marc Johnson" email="mjohnson at apache dot org"/>
<person id="NKB" name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person id="open" name="Poi Developers" email="poi-dev@jakarta.apache.org"/>
</devs>
<actions priority="high">
<action context="code" assigned-to="NKB">
Finish HDF
</action>
<action context="code" assigned-to="GS">
Finish Charts
</action>
<action context="code">
Finish Formulas.
</action>
</actions>
<actions priority="medium">
<action context="code">
Expose functionality in low level records in higher level API
</action>
<action context="code">
Implement more record types.
</action>
<action context="code">
Add more dummy checks (for when API user's do things they
&quot;can't&quot; do). This will involve exploring the various
upper limits on the things Excel can handle.
</action>
<action context="code">
Add support for embedded graphics and other objects.
</action>
<action context="code">
Create new adapter object for handling MulBlank, MulRk, Rk
records.
</action>
<action context="code">
Add a way to copy sheets.
</action>
</actions>
</todo>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "./dtd/book-cocoon-v10.dtd">
<book software="Poi"
title="POI Documentation Translations"
copyright="@year@ Poi Project"
xmlns:xlink="http://www.w3.org/1999/xlink">
<menu label="Translations">
<menu-item label="Main Index" href="../index.html"/>
<menu-item label="Guidelines" href="guidelines.html"/>
</menu>
<menu label="Languages">
<menu-item label="Spanish" href="es/index.html"/>
<menu-item label="German" href="de/index.html"/>
<menu-item label="Japanese" href="http://www.terra-intl.com/jakarta/poi/"/>
</menu>
</book>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../../dtd/book-cocoon-v10.dtd">
<book software="POI"
title="Dokumentation des POI-Projekts"
copyright="@year@ POI Project"
xmlns:xlink="http://www.w3.org/1999/xlink">
<menu label="Gemeinschaft">
<menu-item label="Neuigkeiten" href="../../news.html"/>
<menu-item label="Änderungen" href="../../changes.html"/>
<menu-item label="Aufgaben" href="../../todo.html"/>
<menu-item label="Mitmachen" href="../../getinvolved/index.html"/>
<menu-item label="Unsere Vision" href="../../plan/POI20Vision.html"/>
<menu-item label="Geschichte und Zukunft" href="../../historyandfuture.html"/>
<menu-item label="Wer wir sind" href="../../who.html"/>
<menu-item label="Beschlüsse" href="../../resolutions/index.html"/>
</menu>
<menu label="Marketing">
<menu-item label="Fallstudien" href="../../casestudies.html"/>
</menu>
<menu label="Projekt">
<menu-item label="Überblick" href="../../overview.html"/>
<menu-item label="POIFS" href="../../poifs/index.html"/>
<menu-item label="HSSF" href="../../hssf/index.html"/>
<menu-item label="HDF" href="../../hdf/index.html"/>
<menu-item label="HPSF" href="../../hpsf/index.html"/>
<menu-item label="POI-Utils" href="../../utils/index.html"/>
<menu-item label="Download" href="http://jakarta.apache.org/builds/jakarta-poi/"/>
</menu>
<menu label="Dokumentation">
<menu-item label="Javadocs" href="http://jakarta.apache.org/poi/javadocs/"/>
<menu-item label="FAQ" href="../../faq.html"/>
<menu-item label="Referenzen" href="../../references/index.html"/>
</menu>
<menu label="Code">
<menu-item label="Quellcode" href="http://jakarta.apache.org/poi/javadocs/javasrc/"/>
<menu-item label="CVS" href="http://jakarta.apache.org/site/cvsindex.html"/>
<menu-item label="Die wichtigsten Fehler" href="http://nagoya.apache.org/bugzilla/buglist.cgi?votes=1&amp;product=POI&amp;order=bugs.votes"/>
<menu-item label="Fehlerdatenbank" href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI"/>
<menu-item label="Liste der Patches" href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI&amp;short_desc=%5BPATCH%5D&amp;short_desc_type=allwordssubstr"/>
<menu-item label="Ergebnis der JUnit-Funktionstests" href="http://jakarta.apache.org/poi/tests/junit/"/>
<menu-item label="Ergebnis des Abhängigkeitstests" href="http://jakarta.apache.org/poi/metrics/jdepend/"/>
<menu-item label="Ergebnis des Stiltests" href="http://jakarta.apache.org/poi/metrics/checkstyle/"/>
</menu>
</book>
<!-- Keep this comment at the end of the file
Local variables:
mode: xml
sgml-omittag:nil
sgml-shorttag:nil
sgml-namecase-general:nil
sgml-general-insert-case:lower
sgml-minimize-attributes:nil
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sgml-indent-step:2
sgml-indent-data:t
sgml-parent-document:nil
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
-->

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title>Willkommen bei POI</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="GJS" name="Glen Stampoultzis" email="glens@apache.org"/>
<person id="???" name="Jens Lorenz" email="???"/>
<person id="RK" name="Rainer Klute" email="klute@apache.org"/>
</authors>
</header>
<body>
<section title="Nachrichten">
<section title="Übersetzungen">
<p>
Das POI-Übersetzungsprojekt hat begonnen.
Den Anfang machen <link href="../es/index.html">spanisch</link>,
<link href="http://www.terra-intl.com/jakarta/poi/">japanisch</link>
und deutsch. Andere Sprachen sind herzlich willkommen.
Machen Sie mit!
</p>
</section>
<section title="Logo-Wettbewerb ">
<p>
Die Wahl für das POI-Logo ist beendet. Danke für Ihre Stimmen.
</p>
<!-- <p>-->
<!-- <link href="http://vote.sparklit.com/poll.spark/640946">Click here</link> to see the current results.-->
<!-- </p>-->
</section>
</section>
<section title="Zweck">
<p>
Das POI-Projekt besteht aus Java-APIs zum Erstellen und
Bearbeiten von Dateiformaten, die auf dem Microsoft-Dateiformat »OLE-2
Compound Document« beruhen. Dateien in diesem Format sind unter
anderem die meisten Microsoft-Office-Dateien, wie zum
Beispiel Excel- und Word-Dateien.
</p>
<p>
Grundsätzlich versuchen wir, möglichst viel mit anderen Projekten
zusammenzuarbeiten, um die gewünschten Funktionalitäten zur Verfügung
zu stellen. Einige Beispiele: Für
<link href="http://xml.apache.org/cocoon">Cocoon</link>
werden bald Generatoren und Serializer zur Verfügung stehen. Wir
arbeiten mit
<link href="http://www.openoffice.org/">Open Office.org</link>
zusammen, um das Excel-Dateiformat zu
dokumentieren.
Für <link href="http://jakarta.apache.org/lucene">Lucene</link>
werden bald Filtermodule zur Verfügung stehen. Wir stellen anderen
Projekten Teile des POI-Projektes zur Verfügung, damit diese
die POI-Funktionalitäten nutzen können.
</p>
<section title="Warum und wann sollte man POI nutzen?">
<p>
Wir werden diese Frage komponentenweise beantworten. POI besteht aus
einer Reihe von Komponenten, die jeweils unterschiedliche Probleme
angehen. Das Kürzel »POI« steht für das gesamte Projekt.
</p>
<p>
Mit <strong>POIFS</strong> können Sie Dateien oder Dokumente, die im
OLE 2 Compound Document Format geschrieben wurden, mit Java
einlesen. Solche Dateien werden üblicherweise mit der
MFC-Klassenbibliothek erzeugt.
Außerdem können sie POIFS nutzen, um Dateien im OLE 2 Compound
Document Format zu schreiben. Damit können sie zum Beispiel
den Datenaustausch mit der Windows-Plattform sicherstellen.
Wir können guten Gewissens behaupten, daß POIFS die
vollständigste Implementierung dieses Dateiformates ist.
</p>
<p>
Mit <strong>HSSF</strong> können sie Excel-Dateien in Java lesen und
schreiben. Sie können auch Excel-Tabellen lesen und
modifizieren. Allerdings ist die Schreibfunktionalität im Moment am
ausgereiftesten.
</p>
</section>
<section title="Wofür steht POI ?">
<p>
POI bedeutet »Poor Obfuscation Implementation« (Schlechte,
verschleiernde Implementierung).
Warum geben wir unserem Projekt einen so abschätzigen Namen?
Nun, das Microsoft OLE 2 Compound Document Format ist einfach
schlecht durchdacht. Von seiner Grundidee her ist es ein
Dateiarchiv mit einer Struktur, die dem alten DOS-FAT-Dateisystem
ähnelt. Die Redmonder haben kein bereits vorhandenes Archivformat
wie tar, gzip, zip oder arc genutzt, sondern stattdessen ein
eigenes Archivformat erfunden,
das keinerlei Standardverschlüsselung oder -komprimierung
bietet, das schlecht erweiterbar ist, und das zur
Fragmentierung neigt.
</p>
<p>Poi ist außerdem eine Spezialität der hawaiianischen Küche. Sie wird
in <link href="http://www.m-w.com/">Merriam Webster's
Dictionary</link> beschrieben als: »Ein hawaiianisches Gericht aus
Taro-Wurzeln, die durch Stampfen, Kochen und Kneten zu einer Paste
geformt und oft noch ein wenig gegoren wird.« Dies ist witzigerweise
eine treffende Beschreibung des Dateiformats.</p>
<p>
POI ist also eine Abkürzung. Wenn Sie Abkürzungen nicht mögen,
dann denken sie einfach bei Poi an das hawaiianischen Gericht.
Je nachdem, ob Sie Abkürzungen mögen oder nicht, nutzen sie
einfach POI oder Poi, wenn sie dieses Projekt meinen.
</p>
</section>
</section>
<section title="Komponenten">
<section title="Überblick">
<p>
POI besteht aus mehreren Komponenten, die jeweils unterschiedliche
Aufgaben angehen. Beispielsweise dient die Komponente HSSF dazu,
Excel-Dateien zu schreiben und zu lesen. Es folgt eine Liste aller
Komponenten des POI-Projektes mit einer sehr kurzen Zusammenfassung
ihres Zweckes.
</p>
</section>
<section title="POIFS (POI Filesystem)">
<p>
POIFS ist der älteste und stabilste Teil des Projektes. POIFS
ist unsere Portierung des OLE 2 Compound Document Formats
in reinem Java. Es unterstützt Lesen und Schreiben. Alle
anderen Komponenten basieren auf POIFS. Mehr Informationen
gibt es auf der <link
href="../../poifs/index.html">POIFS-Seite</link>.
</p>
</section>
<section title="HSSF (Horrible Spreadsheet Format)">
<p>
HSSF ist unsere Portierung des Microsoft Excel 97(-2002)
Dateiformats in reinem Java. Es unterstützt Lesen und
Schreiben. Mehr Informationen gibt es auf der
<link href="../../hssf/index.html">HSSF-Seite</link>.
</p>
</section>
<section title="HDF (Horrible Document Format)">
<p>
HDF ist unsere Portierung des Microsoft Word 97 Datei-Formats
in reinem Java. Es unterstützt Lesen und Schreiben. Mehr
Informationen gibt es auf der
<link href="../../hdf/index.html">HDF-Seite</link>.
Diese Komponente ist noch nicht sehr weit fortgeschritten. Wir suchen
Entwickler, die mitmachen.
</p>
</section>
<section title="HPSF (Horrible Property Set Format)">
<p>
HPSF ist unsere Portierung des OLE 2 Property Formats.
Property Sets werden häufig genutzt, um Metadaten eines
Dokuments wie Titel, Autor und Datum zu speichern. Sie
können aber auch für applikationsspezifische Anwendungen
genutzt werden. Mehr Informationen gibt es auf der
<link href="../../hpsf/index.html">HPSF-Seite</link>.
</p>
</section>
</section>
<section title="Wo ist der HSSF-Serializer geblieben?">
<p>
Der HSSF-Serializer war Teil der Version 1.0 und der letzten Versionen
von <link
href="http://www.sourceforge.net/projects/poi">Sourceforge</link>.
Er wurde an das <link
href="http://xml.apache.org/cocoon/">Cocoon</link>-Projekt
übertragen und ist Bestandteil von Cocoon seit Version 2.0.2.
</p>
</section>
<section title="Beitragen">
<p>
Sie möchten zu diesem Projekt beitragen? Hervorragend!
Wir brauchen immer begeisterte, fleißige und talentierte Leute, die
uns bei den verschiedenen Aufgaben des Projektes helfen. Nummer eins
sind Fehlerberichte und Vorschläge für neue Funktionen. Nummer zwei
ist die Dokumentation.</p>
<p>Egal, ob sie Kritik oder Vorschläge haben,
oder ob Sie Beiträge in Form von Code oder Dokumentation liefern
möchten, immer werden Sie bei uns ein offenes Ohr
finden. Und nicht zuletzt brauchen wir Java-Programmierer, die
sich durch die zahlreichen Ecken und Kanten der Microsoft-Dateiformate
hindurchwühlen und uns dabei helfen, diese Formate auf die
Java-Plattform zu portieren.
</p>
<p>
Wenn Sie motiviert sind und Zeit haben, tragen Sie sich
in unsere Mailing-Listen ein, und machen sie mit! Bei der Einarbeitung
helfen wir Ihnen gerne.
</p>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>
<!-- Keep this comment at the end of the file
Local variables:
mode: xml
sgml-omittag:nil
sgml-shorttag:nil
sgml-namecase-general:nil
sgml-general-insert-case:lower
sgml-minimize-attributes:nil
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sgml-indent-data:t
sgml-parent-document:nil
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
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-->

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<?xml version="1.0" encoding="ISO-8859-1"?>
<document>
<header>
<title>Contribuciones de Terceras Partes</title>
<authors>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person name="Agustín Martín Barbero" email="-"/>
</authors>
</header>
<body>
<section title="Cómo Contribuir">
<p>
Vea <link href="contrib.xml">Cómo contribuir a Poi</link>.
</p>
</section>
<section title="Componentes Contribuidos">
<p>
No es que estos tengan, necesariamente, suficiente calidad como para ser incluidos
en el núcleo de la distribución, pero han sido probados bajo <connect href="contrib.xml">
varios entornos clave </connect>, se proporcionan bajo la misma licencia que Poi, y se
incluyen en la distribución de POI bajo el directorio
<code>contrib/</code>.
</p>
<p>
<strong>¡Ninguno Todavía!</strong> - aunque pude esperarse que algunos de los enlaces
listados a continuación lleguen eventualmente a migrarse al nivel de "componentes contribuidos",
y posteriormente incluso a la mismísima distribución principal.
</p>
</section>
<section title="Cola de Parches (Patch Queue)">
<p><link href="patches.html">Entregas de modificaciones (Submissions of modifications)</link>
a Poi que esperan revisión. Cualquiera puede realizar comentarios sobre ellas en la lista
de desarrollo - ¡se necesitan revisores del código!
<strong>Su utilización cae bajo su responsabilidad</strong> - aunque Poi no puede garantizarlo,
estos parches no han sido revisados, cuando menos aceptados.
</p>
</section>
<section title="Otras Extensiones">
<p> Las otras extensiones listadas aquí <strong>tampoco están respaldadas</strong>
por el proyecto Poi - se proporcionan sólo por comodidad. Pueden funcionar o no,
pueden ser de código abierto o no, etc.
</p>
<p> Para añadir un enlace a esta tabla, ver <link href="contrib.xml">Cómo contribuir
a POI</link>.</p>
<table>
<tr>
<th>Nombre y Enlace</th>
<th>Tipo</th>
<th>Descripción</th>
<th>Estado</th>
<th>Licencia</th>
<th>Contacto</th>
</tr>
</table>
</section>
</body>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../../dtd/book-cocoon-v10.dtd">
<book software="Poi"
title="Documentación del Proyecto Poi"
copyright="@year@ Poi Project"
xmlns:xlink="http://www.w3.org/1999/xlink">
<menu label="Comunidad">
<menu-item label="Noticias" href="news.html"/>
<menu-item label="Espejos" href="../../mirrors.html"/>
<menu-item label="Cambios" href="changes.html"/>
<menu-item label="Tareas" href="todo.html"/>
<menu-item label="Contribuya" href="../../getinvolved/index.html"/>
<menu-item label="Listas de Correo" href="http://jakarta.apache.org/site/mail.html"/>
<menu-item label="Visión" href="../../plan/POI20Vision.html"/>
<menu-item label="Historia y Futuro" href="historyandfuture.html"/>
<menu-item label="Quiénes Somos" href="who.html"/>
<menu-item label="Resoluciones" href="../../resolutions/index.html"/>
</menu>
<menu label="Marketing">
<menu-item label="Casos" href="casestudies.html"/>
</menu>
<menu label="Proyecto">
<menu-item label="Descripción General" href="overview.html"/>
<menu-item label="POIFS" href="../../poifs/index.html"/>
<menu-item label="HSSF" href="../../hssf/index.html"/>
<menu-item label="HDF" href="../../hdf/index.html"/>
<menu-item label="HPSF" href="../../hpsf/index.html"/>
<menu-item label="POI-Utils" href="../../utils/index.html"/>
<menu-item label="Descargas" href="http://jakarta.apache.org/builds/jakarta-poi/"/>
</menu>
<menu label="Documentación">
<menu-item label="Javadocs" href="http://jakarta.apache.org/poi/javadocs/"/>
<menu-item label="FAQ" href="faq.html"/>
<menu-item label="Referencias" href="../../references/index.html"/>
</menu>
<menu label="Traducciones">
<menu-item label="Índice" href="../../trans/index.html"/>
<menu-item label="Procedimientos" href="../../trans/guidelines.html"/>
<menu-item label="Alemán" href="../de/index.html"/>
<menu-item label="Español" href="index.html"/>
<menu-item label="Japonés" href="http://www.terra-intl.com/jakarta/poi/"/>
</menu>
<menu label="Código">
<menu-item label="El C&#243;digo" href="http://jakarta.apache.org/poi/javadocs/javasrc/"/>
<menu-item label="CVS" href="http://jakarta.apache.org/site/cvsindex.html"/>
<menu-item label="Fallos (Bugs) Más Votados" href="http://nagoya.apache.org/bugzilla/buglist.cgi?votes=1&amp;product=POI&amp;order=bugs.votes"/>
<menu-item label="Base de Datos de Fallos" href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI"/>
<menu-item label="Parches" href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI&amp;short_desc=%5BPATCH%5D&amp;short_desc_type=allwordssubstr"/>
<menu-item label="Resultados de Pruebas Junit" href="http://jakarta.apache.org/poi/tests/junit/"/>
<menu-item label="Métricas de Dependencia" href="http://jakarta.apache.org/poi/metrics/jdepend/"/>
<menu-item label="Métricas de Comprobación de Estilo" href="http://jakarta.apache.org/poi/metrics/checkstyle/"/>
</menu>
</book>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title>Jakarta POI - Case Studies</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="CR" name="Cameron Riley" email="crileyNO@SPAMekmail.com"/>
<person id="AMB" name="Agustín Martín Barbero" email="-"/>
</authors>
</header>
<body>
<section title="Introducción">
<p>
A number of people are using POI for a variety of purposes. As with
any new API or technology, the first question people generally ask
is not "how can I" but rather "Who else is doing what I'm about to
do?" This is understandable with the abismal success rate in the
software business. These case statements are meant to help create
confidence and understanding.
</p>
</section>
<section title="Submitting a Case Study">
<p>
We are actively seeking case studies for this page (after all it
just started). Andy Oliver (acoliver at apache dot org) has
agreed to have a few T-Shirts printed with the POI logo (once its
chosen) for the first
few best submissions. To submit a case study, either
<link href="http://jakarta.apache.org/poi/getinvolved/index.html">
submit a patch for this page</link> (preferred) or email it to the
<link href="http://jakarta.apache.org/site/mail.html">mailing list
</link>.
</p>
</section>
<section title="Case Studies">
<section title="Edwards And Kelcey Technology">
<p>
Edwards and Kelcey Technology (http://www.ekcorp.com/) developed a
Facility
Managament and Maintenance System for the Telecommunications industry
based
on Turbine and Velocity. Originally the invoicing was done with a simple
CVS
sheet which was then marked up by accounts and customized for each client.
As growth has been consistent with the application, the requirement for
invoices that need not be touched by hand increased. POI provided the
solution to this issue, integrating easily and transparently into the
system. POI HSSF was used to create the invoices directly from the server
in
Excel 97 format and now services over 150 unique invoices per month.
</p>
<p>
Cameron Riley (crileyNO@ SPAMekmail.com)
</p>
</section>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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@ -1,106 +0,0 @@
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE changes PUBLIC "-//APACHE//DTD Changes V1.1//EN" "../../dtd/changes-v11.dtd">
<changes title="Historial de Cambios">
<devs>
<!-- in strict alphabetical order -->
<person id="AO" name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
<person id="GJS" name="Glen Stampoultzis" email="glens@apache.org"/>
<person id="MJ" name="Marc Johnson" email="mjohnson@apache.org"/>
<person id="NKB" name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person id="POI-DEVELOPERS" name="Poi Developers" email="poi-dev@jakarta.apache.org"/>
</devs>
<release version="1.8-dev" date="20 Septiembre 2002">
<action dev="POI-DEVELOPERS" type="add">Soporte para Formato de Datos Personalizado (Custom)</action>
<action dev="POI-DEVELOPERS" type="add">Soporte Unicode Mejorado para Ruso y Japonés</action>
<action dev="POI-DEVELOPERS" type="add">Soporte para Fórmulas Mejorado, incluyendo
sólo-lectura para sentencias tipo "optimizado si" (optimized if).</action>
<action dev="POI-DEVELOPERS" type="add">Soporte para la clonación de objetos</action>
<action dev="POI-DEVELOPERS" type="add">Arreglos en la cabecera/pie</action>
<action dev="POI-DEVELOPERS" type="add">Traducciones de la documentación al Español</action>
<action dev="POI-DEVELOPERS" type="add">Soporte para preservar macros VBA</action>
</release>
<release version="1.7-dev" date="???">
<action dev="NKB" type="update">Se quita la dependencia en tiempo de ejecución del registro
(logging) de "commons".</action>
<action dev="POI-DEVELOPERS" type="update">Soporte para fórmulas</action>
</release>
<release version="1.5.1" date="16 Junio 2002">
<action dev="GJS" type="update">Se quita la dependencia del registro de "commons". Ahora hay que definir la propiedad del sistema poi.loggin para permitir
que los registros (logs) vayan a la salida estándar.</action>
<action dev="GJS" type="fix">Se arregla la gestión de la cadena SST para que las hojas de cálculo con texto rico (rich text) o texto
extendido se lean correctamente.</action>
</release>
<release version="1.5" date="06 Mayo 2002">
<action dev="NKB" type="update">Nueva versión (build) del proyecto.</action>
<action dev="NKB" type="update">Nuevo sistema de documentación del proyecto basada en Cocoon.</action>
<action dev="POI-DEVELOPERS" type="update">Cambio de nombre del paquete</action>
<action dev="POI-DEVELOPERS" type="fix">Varios errores (bugs) corregidos</action>
<action dev="POI-DEVELOPERS" type="add">Etapas preliminares del desarrollo de HFS (no esta listo para el desarrollo)</action>
<action dev="POI-DEVELOPERS" type="add">Soporte inicial de registros de bajo nivel para gráficas (no está completo)</action>
</release>
<release version="1.1.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Se crea un nuevo modelo de eventos</action>
<action dev="POI-DEVELOPERS">Se optimiza HSSF, incluyendo registros (records) para
valores, filas, etc.</action>
<action dev="POI-DEVELOPERS">predicción de tamaño, escritura basada en desplazamiento (en lugar de
multitud de copias de arrays)</action>
<action dev="POI-DEVELOPERS">un poco de re-factoring (¿re-factorización? mejor no) y corrección de errores.</action>
</release>
<release version="1.0.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Actualizaciones menores a la documentación.</action>
</release>
<release version="0.14.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Se añade la clase de ayuda DataFormat y se expone el formato set y get en
HSSFCellStyle</action>
<action dev="POI-DEVELOPERS">Correcciones a las apis de anchura de columna (en cuanto a las unidades) y
varios comentarios javadoc al respecto</action>
<action dev="POI-DEVELOPERS">Corrección para el registro de "Dimensions" (de nuevo)... (uno de estos días
escribiré una prueba unitaria (unit test) para esto ;-p).</action>
<action dev="POI-DEVELOPERS">Alguna optimización en la creación de páginas.</action>
</release>
<release version="0.13.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Mejoras no registradas</action>
</release>
<release version="0.12.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Se añaden MulBlank, Blank, ColInfo</action>
<action dev="POI-DEVELOPERS">Se añade facilidad log4j y se quitan las anotaciones (logs) del tipo sys.out</action>
<action dev="POI-DEVELOPERS">Se añade soporte para la adición de fuentes, estilos y el api de alto
nivel correspondiente para dar estilo a las celdas</action>
<action dev="POI-DEVELOPERS">Se añade soporte para cambiar el alto de una fila, el ancho de una celda, y
sus valores por defecto.</action>
<action dev="POI-DEVELOPERS">Correcciones para internacionalización (UTF-16 debería funcionar ahora
desde HSSFCell.setStringValue, etc cuando se define la codificación)</action>
<action dev="POI-DEVELOPERS">Soporte para la adición / eliminación y cambio de nombre de hojas.</action>
</release>
<release version="0.11.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Distribución de corrección de errores.
Lanzamos una excepción cuando leemos objetos de tipo RKRecord.</action>
</release>
<release version="0.10.0" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Registros de continuación ya funcionan (lectura/escritura)</action>
<action dev="POI-DEVELOPERS">Se añade soporte previo para fórmulas</action>
<action dev="POI-DEVELOPERS">Reorganización del API masiva, re-enpaquetado.</action>
<action dev="POI-DEVELOPERS">Se añade la clase BiffViewer para validar HSSF &amp; POI y/o la
salida de HSSF.</action>
<action dev="POI-DEVELOPERS">Se mejora el soporte a la modificación del API.</action>
</release>
<release version="0.7 (y distribuciones internas)" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Se añade una bandera de codificación para que las apis de alto
y bajo nivel utilicen utf-16 cuando sea necesario (HSSFCell.setEncoding())</action>
<action dev="POI-DEVELOPERS">Se añade soporte de sólo lectura a registros de Etiqueta
(que son reinterpretados como LabelSST cuando se escriben)</action>
<action dev="POI-DEVELOPERS">Se rompe la implementación del registro de continuación (oops)</action>
<action dev="POI-DEVELOPERS">Se añade la clase BiffViewer
para validar HSSF &amp; POI y/o la
salida de HSSF.</action>
</release>
<release version="0.6 (distribución/release)" date="Fecha de distribución no registrada">
<action dev="POI-DEVELOPERS">Soporte para lectura/escritura y modificación.</action>
<action dev="POI-DEVELOPERS">Soporte de sólo lectura para registros de tipo MulRK
(convertidos a Number cuando se escriben)
</action>
</release>
</changes>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE faqs PUBLIC "-//APACHE//DTD FAQ V1.1//EN" "../../dtd/faq-v11.dtd">
<faqs title="Preguntas Más Frecuentes (FAQ)">
<faq>
<question>
¿Por qué la lectura de una hoja de cálculo simple lleva tanto tiempo?
</question>
<answer>
<p>
Probablemente hayas habilitado el registro (logging). Dicho registro es
una herramienta útil para la búsqueda de errores (debug). Tenerlo habilitado
reducirá el rendimiento en un factor de al menos 100. El registro es útil para
comprender por qué POI no puede leer algún fichero o para el propio desarrollo
de POI.
Los errores importantes se lanzan como excepciones, lo cual significa que
probablemente no necesites el registro (log).
</p>
</answer>
</faq>
<faq>
<question>
¿Qué es el "eventmodel" (modelo de evento) de HSSF?
</question>
<answer>
<p> El paquete "eventmodel" de HSSF es un nuevo API para la lectura más eficiente de ficheros
XML. Requiere mayor conocimiento por parte del usuario, pero reduce el consumo de memoria a
una décima parte. Está basado en el modelo de eventos AWT en combinación con SAX. Si necesita
acceso de sólo-lectura a un fichero XML determinado, esta es la mejor manera de hacerlo.</p>
</answer>
</faq>
<faq>
<question>
¿Por qué no puedo leer el documento que creé utilizando Star Office 5.1?
</question>
<answer>
<p>Star Office 5.1 escribe algunos registros utilizando el viejo estándar BIFF.
Esto provoca algunos problemas con POI que sólo soporta BIFF8.</p>
</answer>
</faq>
<faq>
<question>
¿Por qué recibo una excepción cada vez que intento leer mi hoja de cálculo?
</question>
<answer>
<p>Es posible que su hoja de cálculo contenga alguna característica que no esté
soportada actualmente por HSSF. Por ejemplo - hojas de cálculo que contengan
celdas con formato RTF (rich text) no están soportadas actualmente.</p>
</answer>
</faq>
<faq>
<question>
¿Soporta HSSF hojas de cálculo protegidas?
</question>
<answer>
<p>Al proteger una hoja de cálculo, ésta se cifra. No tocaremos el cifrado, porque no
tenemos el suficiente conocimiento legal y no estamos seguros de las implicaciones que
conllevaría el intentar implementar esto. Si desea intentarlo, es libre de hacerlo y
de añadirlo como un módulo enchufable (plugin). Sin embargo, no lo guardaremos aquí.</p>
</answer>
</faq>
<faq>
<question>
¿Cómo se sabe si un campo contiene una fecha con HSSF?
</question>
<answer>
<p>Excel almacena las fechas como números. Así la única manera para determinar
si una celda está realmente almacenada como una fecha consiste en mirar su formato.
Hay un método de ayuda (helper) en HSSFDateUtil (desde la distribución 1.7.0-dev)
que lo comprueba. Gracias a Jason Hoffman por proporcionar la solución.</p>
<source>
case HSSFCell.CELL_TYPE_NUMERIC:
double d = cell.getNumericCellValue();
// test if a date!
if (HSSFDateUtil.isCellDateFormatted(cell)) {
// format in form of M/D/YY
cal.setTime(HSSFDateUtil.getJavaDate(d));
cellText =
(String.valueOf(cal.get(Calendar.YEAR))).substring(2);
cellText = cal.get(Calendar.MONTH)+1 + "/" +
cal.get(Calendar.DAY_OF_MONTH) + "/" +
cellText;
}
</source>
</answer>
</faq>
<faq>
<question>
Estoy intentando ver un fichero XLS enviado como flujo (stream) desde un servlet y tengo
complicaciones. ¿Cuál es el problema?
</question>
<answer>
<p>
El problema normalmente se manifiesta como un montón de caracteres basura
en la pantalla. El problema persiste incluso aunque hayas configurado el tipo mime
correcto.
</p>
<p>
La respuesta breve es: no dependas de IE para mostrar un fichero binario.
Escribe un documento adjunto como es debido si lo envías a través de un servlet.
Toda versión de IE tiene diferentes fallos (bugs) en este sentido.
</p>
<p>
El problema en la mayoría de las versiones de IE reside en que no utiliza el tipo mime
de la respuesta HTTP para determinar el tipo de fichero; en su lugar utiliza la extensión
del fichero en la petición. Así podría añadir un <strong>.xls</strong> a su cadena de petición.
Por ejemplo: <em>http://yourserver.com/myServelet.xls?param1=xx</em>. Esto se consigue
fácilmente a través del mapeo de URL en cualquier contenedor servlet. A veces una
petición como
<em>http://yourserver.com/myServelet?param1=xx&amp;dummy=file.xls</em>
también funciona.
</p>
<p>
Para garantizar la correcta apertura del fichero en Excel desde IE, escribe
tu fichero a un fichero temporal bajo su raiz web desde tu servlet. Envía entonces
una respuesta http al navegador para que haga una redirección en el lado del cliente
a tu fichero temporal. (Si haces una redirección en el lado del servidor utilizando
RequestDispatcher, tendrás que añadir .xls a la petición como se ha mendionado más
arriba)
</p>
<p>
Date cuenta de que cuando pides un documento que se abre con un manejador externo,
IE a veces realiza dos peticiones al servidor web. Así que si tu proceso generador
es pesado, tiene sentido escribir a un fichero temporal, para que peticiones
múltiples utilicen el fichero estático.
</p>
<p>
Nada de esto pertenece a Excel. El mismo problema ocurre cuando intentas general
cualquier fichero binario dinámicamente a un cliente IE. Por ejemplo, si generas
ficheros pdf utilizando
<link href="http://xml.apache.org/fop">FOP</link>,
te encontrarás con los mismos problemas.
</p>
<!-- Gracias a Avik por la respuesta -->
</answer>
</faq>
<faq>
<question>
Quiero dar formato a una celda (Data format of a cell) de una hoja excel como
###,###,###.#### o ###,###,###.0000. ¿Es posible hacer esto con POI?
</question>
<answer>
<p>
HSSF no soporta todavía formatos de datos personalizados, sin embargo,
debería ser una facilidad razonablemente sencilla de añadir y aceptaremos
gustosos contribuciones en este área.
</p>
<p>
Estos son los formatos incluidos que soporta:
</p>
<p>
<link href="http://jakarta.apache.org/poi/javadocs/javasrc/org/apache/poi/hssf/usermodel/HSSFDataFormat_java.html#HSSFDataFormat">http://jakarta.apache.org/poi/javadocs/javasrc/org/apache/poi/hssf/usermodel/HSSFDataFormat_java.html#HSSFDataFormat</link>
</p>
</answer>
</faq>
<faq>
<question>
¿Cómo añado un borde alrededor de una celda unida (merged)?
</question>
<answer>
<p>
Añade celdas vacías alrededor de donde las celdas hubieran estado normalmente y
configura los bordes individualmente para cada celda.
Probablemente mejoraremos HSSF en el futuro para facilitar este proceso.
</p>
</answer>
</faq>
<faq>
<question>
Intenté escribir valores en celdas así como cambiar el nombre de la hoja Excel
en mi lengua nativa, pero no pude hacerlo. :(
</question>
<answer>
<p>
Por defecto HSSF utiliza valores de celdas y nombres de hoja en unicode comprimido,
asi que para soportar la localización deberías utilizar Unicode.
Para hacerlo deberías configurarlo manualmente:
</p>
<source>
//
// para el nombre de la hoja
//
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
wb.setSheetName( 0, "SomeUnicodeName", HSSFWorkbook.ENCODING_UTF_16 );
//
// para el valor de la celda
//
HSSFRow r = s.createRow( 0 );
HSSFCell c = r.createCell( (short)0 );
c.setCellType( HSSFCell.CELL_TYPE_STRING );
c.setEncoding( HSSFCell.ENCODING_UTF_16 );
c.setCellValue( "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F" );
</source>
<p>
Asegúrate de que haces la llamada a setEncoding() antes de llamar a setCellValue(),
si no, lo que le pases no será interpretado correctamente.
</p>
</answer>
</faq>
</faqs>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title>Historia del Proyecto</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="AMB" name="Agustín Martín Barbero" email="-"/>
</authors>
</header>
<body>
<section title="Breve Historia del Proyecto">
<p>
El proyecto POI se gestó tiempo atrás, cerca de abril de 2001,
cuando Andy Oliver obtuvo un contrato de corta duración para realizar
informes Excel basados en Java. Ya había realizado este proyecto unas
cuantas veces antes, y sabía exactamente dónde buscar las herramientas
que necesitaría.
Irónicamente, el API que solía utilizar se había disparado en precio
desde unos $300 ($US) hasta unos $10K ($US). Calculó que a dos personas
les llevaría unos seis meses el portar Excel así que le recomendó al
cliente que pagase los $10K.
</p>
<p>
Cerca de junio de 2001, Andy empezó a pensar lo genial que sería
tener una herramienta Java de código abierto para hacer esto y,
mientras tuvo algo de tiempo libre, comenzó el proyecto y aprendió
cosas sobre el Formato de Documento Compuesto OLE2. Tras chocarse
con varios obstáculos insalvables, se dio cuenta de que necesitaría ayuda.
Publicó un mensaje en su Grupo de Usuarios Java local (JUG) y
preguntó si alguien estaba interesado. Tuvo mucha suerte y el
programador Java de mayor talento que había conocido nunca,
Marc Johnson, se unió al proyecto. A Marc le llevó unas pocas
iteraciones el obtener algo con lo que estaban contentos.
</p>
<p>
Mientras Marc trabajaba en eso, Andy portó XLS a Java, basándose
en la biblioteca de Marc. Varios usuarios escribieron peticiones
para poder leer XLS (no sólo escribirlo como había sido planeado
originalmente) y un usuario tenía peticiones especiales para
un uso diferente de POIFS. Antes de que pasara mucho tiempo,
el alcance del proyecto se había triplicado. POI 1.0 se distribuyó
un mes más tarde de lo planeado, pero con muchas más características.
Marc escribió rápidamente el marco del serializador y el
Serializador HSSF en tiempo récord y Andy generó más documentación
y trabajó en hacer que la gente conociera este proyecto.
</p>
<p>
Poco antes de la distribución, POI tuvo la fortuna de entrar
en contacto con Nicola -Ken- Barrozzi quien proporcionó ejemplos
para el Serializador HSSF y ayudó a descrubir sus desafortunados
fallos (que fueron arreglados de inmediato). Recientemente, Ken
portó la mayoría de la documentación del proyecto POI a XML
partiendo de los documentos HTML cutres que Andy había escrito
con Star Office.
</p>
<p>
Más o menos al mismo tiempo de la primera distribución, Glen Stampoultzis
se unió al proyecto. A Glen le molestaba la actitud impertinente de Andy
en lo que añadir capacidades gráficas a HSSF se refería. Glen se molestó
tanto que decidió coger un martillo y hacerlo él mismo. Glen ya se ha
convertido en parte integral de la comunidad de desarrollo de POI; sus
contribuciones a HSSF ya han comenzado a producir olas.
</p>
<p>
En algún momento decidimos finalmente remitir el proyecto a
<link href="http://xml.apache.org/cocoon">El Proyecto Cocoon
de Apache</link>, sólo para descubrir que el proyecto había
crecido encajando perfectamente con Cocoon hacía tiempo.
Lo que es más, Andy comenzó a ojear otros proyectos a los que
le gustaría que se añadiera la funcionalidad de POI. Así que
se decidió donar los Serializadores y Generadores a Cocoon, otros
componentes de integración con POI a otros proyectos, y los APIs
de POI pasarían a formar parte de Jakarta. Fue un camino con
baches, ¡pero parece que todo salió bien puesto que ahora estás
leyendo esto!
</p>
</section>
<section title="¿Hacia dónde va POI?">
<p>
Primero abordaremos esto desde el punto de vista del proyecto:
Bueno, les hicimos la oferta a Microsoft y Actuate (de coña
... en su mayor parte) de que dejaríamos el proyecto y nos
retiraríamos si simplemente nos firmaban a cada uno un cheque
con muchos ceros. Todavía estoy esperando una llamada o correo
electrónico, así que de momento asumo que no nos van a pagar
para quitarnos de en medio.
</p>
<p>
Después, tenemos algo de trabajo que hacer aquí en Jakarta
para terminar de integrar POI en la comunidad. Lo que es más,
todavía estamos realizando la transición del Serializador a
Cocoon.
</p>
<p>
HSSF, durante el ciclo 2.0, sufrirá varias optimizaciones.
También añadiremos nuevas características como una implementación
completa de Fórmulas y formatos de texto personalizados. Esperamos
ser capaces de generar ficheros más pequeños añadiendo soporte de
escritura para registros RK, MulRK y MulBlank. A día de hoy, la
lectura en HSSF no es muy eficiente. Esto se debe sobre todo a que
para escribir o modificar, uno necesita ser capaz de actualizar
punteros del flujo de subida (upstream pointers) a datos del flujo
de bajada. Para hacer esto hay que tener todo lo que haya en
medio en memoria. En vez de eso, un Generador permitiría que se
procesaran eventos SAX. (Esto se basará en las estructuras de
bajo nivel). Una de las mejores cosas sobre esto es que así no sólo
tendremos una manera más eficiente de leer el fichero, también
tendremos una magnífica forma de utilizar hojas de cálculo como
fuentes de datos XML.
</p>
<p>
El Serializador HSSF, se separará más aún en un marco genérico
para la creación de serializadores para otras plataformas y
en la implementación específica del serializador HSSF. (Esto ya
es cierto en gran medida). También añadiremos soporte para
características ya soportadas por HSSF (estilos, fuentes, formatos
de texto). Esperamos añadir soporte para fórmulas durante este ciclo.
</p>
<p>
Estamos empezando a expandir nuestro alcance de nuevo. Si pudimos
hacer todo esto para ficheros XLS, ¿qué hay de ficheros Doc o PPT?
Pensamos que nuestro siguiente componente (HDF - Formato de
Documento Horrible) debería seguir el mismo patrón. Esperamos
que se nos una sangre nueva al equipo y que nos permita abordar
esto con mayor celeridad (en parte porque POIFS ya está terminado).
¡Pero a lo mejor lo que más necesitamos es a ti!
</p>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Programas Alternativos a HSSF</subtitle>
<authors>
<person name="Glen Stampoultzis" email="glens@apache.org"/>
</authors>
</header>
<body>
<section title="Alternativos">
<p>
Puede ser que no es buen idea hablar de nuestra competidores pero nosotros creemos que la compentencia es bueno y que tenemos disponible hoy en día la mejor solución para escribir y leer archivos de Excel
</p>
<table>
<tr>
<td><b>Producto</b></td>
<td><b>URL</b></td>
<td><b>Descripción</b></td>
</tr>
<tr>
<td>Formula One</td>
<td>
<link href="http://www.tidestone.com/">www.tidestone.com</link>
</td>
<td>
Una alternativa a este proyecto es comprar a $10,000 (dolares EEUU) el "Formula 1 library" y aceptar su API immadura y sus limitaciones.
</td>
</tr>
<tr>
<td>Visual Basic</td>
<td>
<link href="http://www.microsoft.com/">www.microsoft.com</link>
</td>
<td>
Deja de usar XML y escriba su programa usando Visual Basic en una computadora de Microsoft Windows. O trata de crear una solución usando la versión beta e indocumentada del nuevo formato de Microsoft llamado 'XML for Office'.
</td>
</tr>
<tr>
<td>JExcel</td>
<td>http://stareyes.homeip.net:8888</td>
<td>Frequentemente no está disponible. Se conoce poco acerca de
las habilidades de este programa.
</td>
</tr>
<tr>
<td>JWorkbook</td>
<td>http://www.object-refinery.com/jworkbook/index.html</td>
<td>
Este esfuerzo puede trabajar con Gnumeric y Excel, pero la parte de Excel lo hace usando POI de todas formas.
</td>
</tr>
<tr>
<td>xlReader</td>
<td><link href="http://www.sourceforge.net/projects/xlrd">http://www.sourceforge.net/projects/xlrd</link></td>
<td>Funciona bastante bien leyendo Excel.
</td>
</tr>
<tr>
<td>Excel ODBC Driver</td>
<td><link href="http://www.nwlink.com/~leewal/content/exceljavasample.htm">http://www.nwlink.com/~leewal/content/exceljavasample.htm</link></td>
<td>ODBC ofrece una forma bastante rara para trabajar con Excel.
</td>
</tr>
<tr>
<td>ExtenXLS</td>
<td><link href="http://www.extentech.com/products/ExtenXLS/docs/intro3.jsp">http://www.extentech.com/products/ExtenXLS/docs/intro3.jsp</link></td>
<td>Una biblioteca commercial para leer, modificar, y escribir hojas de balance de Excel. No es barato pero cuesta menos que Formula 1. No tenemos idea de la calidad de este software.
</td>
</tr>
<tr>
<td>J-Integra Java-Excel Bridge</td>
<td><link href="http://www.intrinsyc.com/products/bridging/jintegra.asp">http://www.intrinsyc.com/products/bridging/jintegra.asp</link></td>
<td>Usa DCOM a una instancia de Excel en una computadora de Windows.
</td>
</tr>
<tr>
<td>Perl &amp; C</td>
<td>-</td>
<td>Hay varias bibliotecas en los idiomas de Perl y C. Pero no son consistentes o compatibles.
</td>
</tr>
<tr>
<td>VistaJDBC</td>
<td><link href="http://www.vistaportal.com/products/vistajdbc.htm">http://www.vistaportal.com/products/vistajdbc.htm</link></td>
<td>El driver de VistaJDBC trabaja con hojas de balance de StarOffice y Excel y proveen acceso al data sin tener que programar usando SQL estandar. VistaJDBC tambien permite escoger cellulas no solo por columna y fila per tambien cellulas individuales específicas, juegos de celulas, etc.
</td>
</tr>
<tr>
<td>Coldtags Excel Tag Library</td>
<td><link href="http://www.servletsuite.com/servlets/exceltag.htm">http://www.servletsuite.com/servlets/exceltag.htm</link></td>
<td>
Esta biblioteca ayuda a crear archivos en el formato de CSV, en la cual se permiten numeros y textos. Puede crear achivos de CSV sin esta ayuda, pero la bibioteca da estructura y leabilidad a su codigo y lo puede extender si necesita manejar casos mas complejos. Cuando un browser encuentra uno de estos páginas de JSP, abre una instancia de Excel automaticamente. No hay formatting, hojas de balance distintas, etc. O sea que, estrictamente, no es un competidor pero en algunos casos es todo lo que se necesita.
</td>
</tr>
</table>
</section>
</body>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="El Proyecto de POI"
title="HSSF"
copyright="El Proyecto de POI de @year@">
<menu label="Navegación">
<menu-item label="Página Principal" href="../index.html"/>
</menu>
<menu label="HSSF">
<menu-item label="Referencia Rápida" href="quick-guide.html"/>
<menu-item label="Como Se Hace" href="how-to.html"/>
<menu-item label="Apoyo Con Fórmulas" href="formula.html" />
<menu-item label="Use Case" href="use-case.html"/>
<menu-item label="Diagramas" href="diagrams.html"/>
<menu-item label="Alternativas" href="alternatives.html"/>
<menu-item label="Limitaciones" href="limitations.html"/>
</menu>
<menu label="Guía para el Contribuyente">
<menu-item label="Hack-eando HSSF" href="hacking-hssf.html"/>
<menu-item label="Generador de Registros" href="record-generator.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Vista General</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Diagrama de Clases del Usermodel por Matthew Young">
<img src="images/usermodel.gif"/>
</section>
</body>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Vista General</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Vista General">
<p>
Se espera usar esta sección para diagramas (UML/etc) que ayudan a
explicar HSSF.
</p>
<ul>
<li>
<link href="diagram1.html">Diagrama de Clases del UserModel</link> -
por Matthew Young (myoung at westernasset dot com)
</li>
</ul>
<p>
Tiene más? Agrega un nuevo &quot;bug&quot; al archivo de bugs con la
palabra [DOCUMENTATION] antes de la descripción y un link al file en algun webserver. Si no tiene su propio webserver, mandaselo por email a (acoliver at apache dot org) siempre y cuando el tamaño del archivo es menor a 5 Mb. Diagramas deben estar en algun formato compatible, por lo menos, con Linux y Windows. Se prefieren diagramas que se pueden cambiar o modificar pero entendemos que hay pocos programas para crear UML que están a buen precio. Y no, no TIENEN que ser UML... solo tienen que ser utiles.
</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Formula Support</title>
<authors>
<person email="avik@apache.org" name="Avik Sengupta" id="AS"/>
</authors>
</header>
<body>
<section title="Introduction">
<p>
This document describes the current state of formula support in POI.
The information in this document applies to the 2.0-dev version of POI (i.e. CVS HEAD).
Since this area is a work in progress, this document will be updated with new features as and
when they are added.
</p>
</section>
<section title="The basics">
<p>
In org.apache.poi.hssf.usermodel.HSSFCell
<strong> setCellFormula(&quot;formulaString&quot;) </strong> is used to add a formula to sheet and
<strong> getCellFormula() </strong> is used to retrieve the string representation of a formula.
</p>
<p>
We aim to support the complete excel grammer for formulas. Thus, the string that you pass in
to the <b> setCellFormula </b> call should be what you expect to type into excel. Also, note
that you should NOT add a "=" to the front of the string.
</p>
</section>
<section title="Supported Features">
<ul>
<li>Cell References</li>
<li>String, integer and floating point literals</li>
<li>Area references</li>
<li>Relative or absolute references</li>
<li>Arithmetic Operators</li>
<li>Sheet Functions</li>
</ul>
</section>
<section title="Partially supported">
<ul>
<li>
The formula parser now has the ability to parse formulas containing strings. However
formulas that return a string value are not yet supported.
</li>
<li>Formula tokens in Excel are stored in one of three possible <em> classes </em>:
Reference, Value and Array. Based on the location of a token, its class can change
in complicated and undocumented ways. While we have support for most cases, we
are not sure if we have covered all bases (since there is no documentation for this area.)
We would therefore like you to report any
occurence of #VALUE! in a cell upon opening a POI generated workbook in excel. (Check that
typing the formula into Excel directly gives a valid result.)
</li>
</ul>
</section>
<section title="Not yet supported">
<ul>
<li>Array formulas</li>
<li>Formulas with logical operations (IF) </li>
<li>Sheet References in formulas</li>
<li>Everything else :) </li>
</ul>
</section>
<section title="Internals">
<p>
Formulas in Excel are stored as sequences of tokens in Reverse Polish Notation order. The
<link href="http://sc.openoffice.org/excelfileformat.pdf">open office XLS spec</link> is the best
documentation you will find for the format.
</p>
<p>
The tokens used by excel are modelled as individual *Ptg classes in the <strong>
org.apache.poi.hssf.record.formula</strong> package.
</p>
<p>
The task of parsing a formula string into an array of RPN ordered tokens is done by the <strong>
org.apache.poi.hssf.record.formula.FormulaParser</strong> class. This class implements a hand
written recursive descent parser.
</p>
<p>Check out the <link href="http://jakarta.apache.org/poi/javadocs/">javadocs </link> for details.
</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Hacking HSSF</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
<person email="acoliver@apache.org" name="Andrew Oliver" id="AO"/>
</authors>
</header>
<body>
<section title="Where Can I Find Documentation on Feature X">
<p>
You might find the
'Excel 97 Developer's Kit' (out of print, Microsoft Press, no
restrictive covenants, available on Amazon.com) helpful for
understanding the file format.
</p>
<p>
Also useful is the <link href="http://sc.openoffice.org/excelfileformat.pdf">open office XLS spec</link>. We
are collaborating with the maintainer of the spec so if you think you can add something to their
document just send through your changes.
</p>
</section>
<section title="Help, I Can't Find Feature X Documented Anywhere">
<ol>
<li>
Look at OpenOffice.org or Gnumeric sources if its implemented there.
</li>
<li>
Use org.apache.poi.hssf.dev.BiffViewer to view the structure of the
file. Experiment by adding one criteria entry at a time. See what it
does to the structure, infer behavior and structure from it. Using the
unix diff command (or get cygwin from www.cygwin.com for windows) you
can figure out a lot very quickly. Unimplemented records show up as
'UNKNOWN' and prints a hex dump.
</li>
</ol>
</section>
<section title="Low-level Record Generation">
<p>
Low level records can be time consuming to created. We created a record
generator to help generate some of the simpler tasks.
</p>
<p>
We use XML
descriptors to generate the Java code (which sure beats the heck out of
the PERL scripts originally used ;-) for low level records. The
generator is kinda alpha-ish right now and could use some enhancement,
so you may find that to be about 1/2 of the work. Notice this is in
org.apache.poi.hssf.record.definitions.
</p>
</section>
<section title="Important Notice">
<p>One thing to note: If you are making a large code contribution we need to ensure
any participants in this process have never
signed a "Non Disclosure Agreement" with Microsoft, and have not
received any information covered by such an agreement. If they have
they'll not be able to participate in the POI project. For large contributions we
may ask you to sign an agreement.</p>
</section>
<section title="What Can I Work On?">
<p>Check our <link href="../todo.html">todo list</link> or simply look for missing functionality. Start small
and work your way up.</p>
</section>
<section title="What Else Should I Know?">
<p>Make sure you <link href="http://jakarta.apache.org/poi/contrib.html">read the contributing section</link>
as it contains more generation information about contributing to Poi in general.</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>The New Halloween Document</title>
<authors>
<person email="acoliver2@users.sourceforge.net" name="Andrew C. Oliver" id="AO"/>
<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
<person email="sergeikozello@mail.ru" name="Sergei Kozello" id="SK"/>
</authors>
</header>
<body>
<section title="How to use the HSSF prototype API">
<section title="Capabilities">
<p>This release of the how-to outlines functionality for the CVS HEAD.
Those looking for information on previous releases should
look in the documentation distributed with that release.</p>
<p>
This release allows numeric and string cell values to be written to
or read from an XLS file as well as reading and writing dates. Also
in this release is row and column sizing, cell styling (bold,
italics, borders,etc), and support for built-in data formats. New
to this release is an event-based API for reading XLS files.
It differs greatly from the read/write API
and is intended for intermediate developers who need a smaller
memory footprint. It will also serve as the basis for the HSSF
Generator.</p>
</section>
<section title="General Use">
<section title="User API">
<section title="Writing a new one">
<p>The high level API (package: org.apache.poi.hssf.usermodel)
is what most people should use. Usage is very simple.
</p>
<p>Workbooks are created by creating an instance of
org.apache.poi.hssf.usermodel.HSSFWorkbook.
</p>
<p>Sheets are created by calling createSheet() from an existing
instance of HSSFWorkbook, the created sheet is automatically added in
sequence to the workbook. Sheets do not in themselves have a sheet
name (the tab at the bottom); you set
the name associated with a sheet by calling
HSSFWorkbook.setSheetName(sheetindex,&quot;SheetName&quot;,encoding).
The name may be in 8bit format (HSSFWorkbook.ENCODING_COMPRESSED_UNICODE)
or Unicode (HSSFWorkbook.ENCODING_UTF_16). Default encoding is 8bit per char.
</p>
<p>Rows are created by calling createRow(rowNumber) from an existing
instance of HSSFSheet. Only rows that have cell values should be
added to the sheet. To set the row's height, you just call
setRowHeight(height) on the row object. The height must be given in
twips, or 1/20th of a point. If you prefer, there is also a
setRowHeightInPoints method.
</p>
<p>Cells are created by calling createCell(column, type) from an
existing HSSFRow. Only cells that have values should be added to the
row. Cells should have their cell type set to either
HSSFCell.CELL_TYPE_NUMERIC or HSSFCell.CELL_TYPE_STRING depending on
whether they contain a numeric or textual value. Cells must also have
a value set. Set the value by calling setCellValue with either a
String or double as a parameter. Individual cells do not have a
width; you must call setColumnWidth(colindex, width) (use units of
1/256th of a character) on the HSSFSheet object. (You can't do it on
an individual basis in the GUI either).</p>
<p>Cells are styled with HSSFCellStyle objects which in turn contain
a reference to an HSSFFont object. These are created via the
HSSFWorkbook object by calling createCellStyle() and createFont().
Once you create the object you must set its parameters (colors,
borders, etc). To set a font for an HSSFCellStyle call
setFont(fontobj).
</p>
<p>Once you have generated your workbook, you can write it out by
calling write(outputStream) from your instance of Workbook, passing
it an OutputStream (for instance, a FileOutputStream or
ServletOutputStream). You must close the OutputStream yourself. HSSF
does not close it for you.
</p>
<p>Here is some example code (excerpted and adapted from
org.apache.poi.hssf.dev.HSSF test class):</p>
<source><![CDATA[
short rownum;
// create a new file
FileOutputStream out = new FileOutputStream("workbook.xls");
// create a new workbook
HSSFWorkbook wb = new HSSFWorkbook();
// create a new sheet
HSSFSheet s = wb.createSheet();
// declare a row object reference
HSSFRow r = null;
// declare a cell object reference
HSSFCell c = null;
// create 3 cell styles
HSSFCellStyle cs = wb.createCellStyle();
HSSFCellStyle cs2 = wb.createCellStyle();
HSSFCellStyle cs3 = wb.createCellStyle();
// create 2 fonts objects
HSSFFont f = wb.createFont();
HSSFFont f2 = wb.createFont();
//set font 1 to 12 point type
f.setFontHeightInPoints((short) 12);
//make it blue
f.setColor( (short)0xc );
// make it bold
//arial is the default font
f.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//set font 2 to 10 point type
f2.setFontHeightInPoints((short) 10);
//make it red
f2.setColor( (short)HSSFFont.COLOR_RED );
//make it bold
f2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
f2.setStrikeout( true );
//set cell stlye
cs.setFont(f);
//set the cell format see HSSFDataFromat for a full list
cs.setDataFormat(HSSFDataFormat.getFormat("($#,##0_);[Red]($#,##0)"));
//set a thin border
cs2.setBorderBottom(cs2.BORDER_THIN);
//fill w fg fill color
cs2.setFillPattern((short) HSSFCellStyle.SOLID_FOREGROUND);
// set the font
cs2.setFont(f2);
// set the sheet name in Unicode
wb.setSheetName(0, "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F " +
"\u0421\u0442\u0440\u0430\u043D\u0438\u0447\u043A\u0430",
HSSFWorkbook.ENCODING_UTF_16 );
// in case of compressed Unicode
// wb.setSheetName(0, "HSSF Test", HSSFWorkbook.ENCODING_COMPRESSED_UNICODE );
// create a sheet with 30 rows (0-29)
for (rownum = (short) 0; rownum < 30; rownum++)
{
// create a row
r = s.createRow(rownum);
// on every other row
if ((rownum % 2) == 0)
{
// make the row height bigger (in twips - 1/20 of a point)
r.setHeight((short) 0x249);
}
//r.setRowNum(( short ) rownum);
// create 10 cells (0-9) (the += 2 becomes apparent later
for (short cellnum = (short) 0; cellnum < 10; cellnum += 2)
{
// create a numeric cell
c = r.createCell(cellnum);
// do some goofy math to demonstrate decimals
c.setCellValue(rownum * 10000 + cellnum
+ (((double) rownum / 1000)
+ ((double) cellnum / 10000)));
String cellValue;
// create a string cell (see why += 2 in the
c = r.createCell((short) (cellnum + 1));
// on every other row
if ((rownum % 2) == 0)
{
// set this cell to the first cell style we defined
c.setCellStyle(cs);
// set the cell's string value to "Test"
c.setEncoding( HSSFCell.ENCODING_COMPRESSED_UNICODE );
c.setCellValue( "Test" );
}
else
{
c.setCellStyle(cs2);
// set the cell's string value to "\u0422\u0435\u0441\u0442"
c.setEncoding( HSSFCell.ENCODING_UTF_16 );
c.setCellValue( "\u0422\u0435\u0441\u0442" );
}
// make this column a bit wider
s.setColumnWidth((short) (cellnum + 1), (short) ((50 * 8) / ((double) 1 / 20)));
}
}
//draw a thick black border on the row at the bottom using BLANKS
// advance 2 rows
rownum++;
rownum++;
r = s.createRow(rownum);
// define the third style to be the default
// except with a thick black border at the bottom
cs3.setBorderBottom(cs3.BORDER_THICK);
//create 50 cells
for (short cellnum = (short) 0; cellnum < 50; cellnum++)
{
//create a blank type cell (no value)
c = r.createCell(cellnum);
// set it to the thick black border style
c.setCellStyle(cs3);
}
//end draw thick black border
// demonstrate adding/naming and deleting a sheet
// create a sheet, set its title then delete it
s = wb.createSheet();
wb.setSheetName(1, "DeletedSheet");
wb.removeSheetAt(1);
//end deleted sheet
// write the workbook to the output stream
// close our file (don't blow out our file handles
wb.write(out);
out.close();
]]></source>
</section>
<section title="Reading or modifying an existing file">
<p>Reading in a file is equally simple. To read in a file, create a
new instance of org.apache.poi.poifs.Filesystem, passing in an open InputStream, such as a FileInputStream
for your XLS, to the constructor. Construct a new instance of
org.apache.poi.hssf.usermodel.HSSFWorkbook passing the
Filesystem instance to the constructor. From there you have access to
all of the high level model objects through their assessor methods
(workbook.getSheet(sheetNum), sheet.getRow(rownum), etc).
</p>
<p>Modifying the file you have read in is simple. You retrieve the
object via an assessor method, remove it via a parent object's remove
method (sheet.removeRow(hssfrow)) and create objects just as you
would if creating a new xls. When you are done modifying cells just
call workbook.write(outputstream) just as you did above.</p>
<p>An example of this can be seen in
<link href="http://cvs.apache.org/viewcvs/~checkout~/jakarta-poi/src/java/org/apache/poi/hssf/dev/HSSF.java?rev=1.1">org.apache.poi.hssf.dev.HSSF</link>.</p>
</section>
</section>
<section title="Event API">
<p>The event API is brand new. It is intended for intermediate
developers who are willing to learn a little bit of the low level API
structures. Its relatively simple to use, but requires a basic
understanding of the parts of an Excel file (or willingness to
learn). The advantage provided is that you can read an XLS with a
relatively small memory footprint.
</p>
<p>To use this API you construct an instance of
org.apache.poi.hssf.eventmodel.HSSFRequest. Register a class you
create that supports the
org.apache.poi.hssf.eventmodel.HSSFListener interface using the
HSSFRequest.addListener(yourlistener, recordsid). The recordsid
should be a static reference number (such as BOFRecord.sid) contained
in the classes in org.apache.poi.hssf.record. The trick is you
have to know what these records are. Alternatively you can call
HSSFRequest.addListenerForAllRecords(mylistener). In order to learn
about these records you can either read all of the javadoc in the
org.apache.poi.hssf.record package or you can just hack up a
copy of org.apache.poi.hssf.dev.EFHSSF and adapt it to your
needs. TODO: better documentation on records.</p>
<p>Once you've registered your listeners in the HSSFRequest object
you can construct an instance of
org.apache.poi.poifs.filesystem.FileSystem (see POIFS howto) and
pass it your XLS file inputstream. You can either pass this, along
with the request you constructed, to an instance of HSSFEventFactory
via the HSSFEventFactory.processWorkbookEvents(request, Filesystem)
method, or you can get an instance of DocumentInputStream from
Filesystem.createDocumentInputStream(&quot;Workbook&quot;) and pass
it to HSSFEventFactory.processEvents(request, inputStream). Once you
make this call, the listeners that you constructed receive calls to
their processRecord(Record) methods with each Record they are
registered to listen for until the file has been completely read.
</p>
<p>A code excerpt from org.apache.poi.hssf.dev.EFHSSF (which is
in CVS or the source distribution) is reprinted below with excessive
comments:</p>
<source><![CDATA[
/**
* This example shows how to use the event API for reading a file.
*/
public class EventExample
implements HSSFListener
{
private SSTRecord sstrec;
/**
* This method listens for incoming records and handles them as required.
* @param record The record that was found while reading.
*/
public void processRecord(Record record)
{
switch (record.getSid())
{
// the BOFRecord can represent either the beginning of a sheet or the workbook
case BOFRecord.sid:
BOFRecord bof = (BOFRecord) record;
if (bof.getType() == bof.TYPE_WORKBOOK)
{
System.out.println("Encountered workbook");
// assigned to the class level member
} else if (bof.getType() == bof.TYPE_WORKSHEET)
{
System.out.println("Encountered sheet reference");
}
break;
case BoundSheetRecord.sid:
BoundSheetRecord bsr = (BoundSheetRecord) record;
System.out.println("New sheet named: " + bsr.getSheetname());
break;
case RowRecord.sid:
RowRecord rowrec = (RowRecord) record;
System.out.println("Row found, first column at "
+ rowrec.getFirstCol() + " last column at " + rowrec.getLastCol());
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
System.out.println("Cell found with value " + numrec.getValue()
+ " at row " + numrec.getRow() + " and column " + numrec.getColumn());
break;
// SSTRecords store a array of unique strings used in Excel.
case SSTRecord.sid:
sstrec = (SSTRecord) record;
for (int k = 0; k < sstrec.getNumUniqueStrings(); k++)
{
System.out.println("String table value " + k + " = " + sstrec.getString(k));
}
break;
case LabelSSTRecord.sid:
LabelSSTRecord lrec = (LabelSSTRecord) record;
System.out.println("String cell found with value "
+ sstrec.getString(lrec.getSSTIndex()));
break;
}
}
/**
* Read an excel file and spit out what we find.
*
* @param args Expect one argument that is the file to read.
* @throws IOException When there is an error processing the file.
*/
public static void main(String[] args) throws IOException
{
// create a new file input stream with the input file specified
// at the command line
FileInputStream fin = new FileInputStream(args[0]);
// create a new org.apache.poi.poifs.filesystem.Filesystem
POIFSFileSystem poifs = new POIFSFileSystem(fin);
// get the Workbook (excel part) stream in a InputStream
InputStream din = poifs.createDocumentInputStream("Workbook");
// construct out HSSFRequest object
HSSFRequest req = new HSSFRequest();
// lazy listen for ALL records with the listener shown above
req.addListenerForAllRecords(new EventExample());
// create our event factory
HSSFEventFactory factory = new HSSFEventFactory();
// process our events based on the document input stream
factory.processEvents(req, din);
// once all the events are processed close our file input stream
fin.close();
// and our document input stream (don't want to leak these!)
din.close();
System.out.println("done.");
}
}
]]></source>
</section>
<section title="Low Level APIs">
<p>The low level API is not much to look at. It consists of lots of
&quot;Records&quot; in the org.apache.poi.hssf.record.* package,
and set of helper classes in org.apache.poi.hssf.model.*. The
record classes are consistent with the low level binary structures
inside a BIFF8 file (which is embedded in a POIFS file system). You
probably need the book: &quot;Microsoft Excel 97 Developer's Kit&quot;
from Microsoft Press in order to understand how these fit together
(out of print but easily obtainable from Amazon's used books). In
order to gain a good understanding of how to use the low level APIs
should view the source in org.apache.poi.hssf.usermodel.* and
the classes in org.apache.poi.hssf.model.*. You should read the
documentation for the POIFS libraries as well.</p>
</section>
<section title="HSSF Class/Test Application">
<p>The HSSF application is nothing more than a test for the high
level API (and indirectly the low level support). The main body of
its code is repeated above. To run it:
</p>
<ul>
<li>download the poi-alpha build and untar it (tar xvzf
tarball.tar.gz)
</li>
<li>set up your classpath as follows:
<code>export HSSFDIR={wherever you put HSSF's jar files}
export LOG4JDIR={wherever you put LOG4J's jar files}
export CLASSPATH=$CLASSPATH:$HSSFDIR/hssf.jar:$HSSFDIR/poi-poifs.jar:$HSSFDIR/poi-util.jar:$LOG4JDIR/jog4j.jar</code>
</li><li>type:
<code>java org.apache.poi.hssf.dev.HSSF ~/myxls.xls write</code></li>
</ul>
<p></p>
<p>This should generate a test sheet in your home directory called <code>&quot;myxls.xls&quot;</code>. </p>
<ul>
<li>Type:
<code>java org.apache.poi.hssf.dev.HSSF ~/input.xls output.xls</code>
<br/>
<br/>
This is the read/write/modify test. It reads in the spreadsheet, modifies a cell, and writes it back out.
Failing this test is not necessarily a bad thing. If HSSF tries to modify a non-existant sheet then this will
most likely fail. No big deal. </li>
</ul>
</section>
<section title="Logging facility">
<p>Poi can dynamically select it's logging implementation. Poi trys to
create a logger using the System property named "org.apache.poi.util.POILogger".
Out of the box this can be set to one of three values:
</p>
<ul>
<li>org.apache.poi.util.CommonsLogger</li>
<li>org.apache.poi.util.NullLogger</li>
<li>org.apache.poi.util.SystemOutLogger</li>
</ul>
<p>
If the property is not defined or points to an invalid classthen the NullLogger is used.
</p>
<p>
Refer to the commons logging package level javadoc for more information concerning how to
<link href="http://jakarta.apache.org/commons/logging/api/index.html">configure commons logging.</link>
</p>
</section>
<section title="HSSF Developer's Tools">
<p>HSSF has a number of tools useful for developers to debug/develop
stuff using HSSF (and more generally XLS files). We've already
discussed the app for testing HSSF read/write/modify capabilities;
now we'll talk a bit about BiffViewer. Early on in the development of
HSSF, it was decided that knowing what was in a record, what was
wrong with it, etc. was virtually impossible with the available
tools. So we developed BiffViewer. You can find it at
org.apache.poi.hssf.dev.BiffViewer. It performs two basic
functions and a derivative.
</p>
<p>The first is &quot;biffview&quot;. To do this you run it (assumes
you have everything setup in your classpath and that you know what
you're doing enough to be thinking about this) with an xls file as a
parameter. It will give you a listing of all understood records with
their data and a list of not-yet-understood records with no data
(because it doesn't know how to interpret them). This listing is
useful for several things. First, you can look at the values and SEE
what is wrong in quasi-English. Second, you can send the output to a
file and compare it.
</p>
<p>The second function is &quot;big freakin dump&quot;, just pass a
file and a second argument matching &quot;bfd&quot; exactly. This
will just make a big hexdump of the file.
</p>
<p>Lastly, there is &quot;mixed&quot; mode which does the same as
regular biffview, only it includes hex dumps of certain records
intertwined. To use that just pass a file with a second argument
matching &quot;on&quot; exactly.</p>
<p>In the next release cycle we'll also have something called a
FormulaViewer. The class is already there, but its not very useful
yet. When it does something, we'll document it.</p>
</section>
<section title="What's Next?">
<p>This release contains code that supports &quot;internationalization&quot;
or more accurately non-US/UK languages; however, it has not been
tested with the new API changes (please help us with this). We've
shifted focus a bit for this release in recognition of the
international support we've gotten. We're going to focus on western
European languages for our first beta. We're more than happy to
accept help in supporting non-Western European languages if someone
who knows what they're doing in this area is willing to pitch in!
(There is next to no documentation on what is necessary to support
such a move and its really hard to support a language when you don't even
know the alphabet).</p>
<p>This release of HSSF does not yet support Formulas. I've been
focusing on the requests I've gotten in. That being said, if we get
more user feedback on what is most useful first we'll aim for that.
As a general principal, HSSF's goal is to support HSSF-Serializer
(meaning an emphasis on write). We would like to hear from you! How
are you using HSSF/POIFS? How would you like to use it? What features
are most important first?
</p>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Overview">
<p>HSSF is the POI Project's pure Java implementation of the Excel '97(-2002) file format.</p>
<p>HSSF provides a way to read spreadsheets create, modify, read and write XLS spreadsheets
It provides:
</p>
<ul>
<li>low level structures for those with special needs</li>
<li>an eventmodel api for efficient read-only access</li>
<li>a full usermodel api for creating, reading and modifying XLS files</li>
</ul>
<p>
Truth be told there is probably a better way to generate your spreadsheet
generation (yet you'll still be using HSSF indirectly). At the time of
this writing we're in the process of moving the HSSF Serializer over to
the <link href="http://xml.apache.org/cocoon">Apache Cocoon
Project</link>. With Cocoon you can serialize any XML datasource (of
which might be a ESQL page outputting in SQL for instance) by simply
applying the stylesheet and designating the serializer.
</p>
<p>
If you're merely reading spreadsheet data, then use the eventmodel api
in the org.apache.poi.hssf.eventmodel package.
</p>
<p>
If you're modifying spreadsheet data then use the usermodel api. You
can also generate spreadsheets this way, but using Cocoon (which will do
it this way indirectly) is the best way...we promise.
</p>
</section>
</body>
</document>

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<document>
<header>
<title>Limitations</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
</authors>
</header>
<body>
<section title="Version 1.5 limitations">
<p>
The intent of this document is to outline some of the known limitations of the
POI HSSF API's. It is not intended to be complete list of every bug or missing
feature of HSSF, rather it's purpose is to provide a broad feel for some of the
functionality that is missing or broken.
</p>
<ul>
<li>
Charts<br/><br/>
You can not currently create charts. This is planned for the 2.0 release. You can
however create a chart in Excel, modify the chart data values using HSSF and write
a new spreadsheet out. This is possible because POI attempts to keep existing records
intact as far as possible.<br/><br/>
</li>
<li>
Rich Text<br/><br/>
HSSF does not support rich text cells. Rich text cells are
cells that have multiple fonts and styles in the once cell. Any attempt to read
a spreadsheet that has rich text cells will throw an exception. This feature may
be supported in the future but it is not currently planned. Patches are welcome.<br/><br/>
</li>
<li>
Outlines<br/><br/>
It is not yet possible to create outlines. Reading a spreadsheet with outlines
may work correctly but has not been tested. Write support for outlines may
be added in the future but it is not currently planned. Patches are welcome.<br/><br/>
</li>
<li>
Macros<br/><br/>
Macros can not be created. The are currently no plans to support macros. Reading
workbooks containing macros is supported but attempting to write those workbooks
will fail. This is because macros are stored as extra file sytems within the
compound document, and these are not currently kept when the file is rewritten.<br/><br/>
</li>
<li>
Pivot Tables<br/><br/>
Generating pivot tables is not supported. Reading spreadsheets containing pivot tables
has not been tested.
</li>
</ul>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Busy Developers' Guide to HSSF Features</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="CO"/>
</authors>
</header>
<body>
<section title="Busy Developers' Guide to Features">
<p>
Want to use HSSF read and write spreadsheets in a hurry? This guide is for you. If you're after
more in-depth coverage of the HSSF user-API please consult the <link href="how-to.html">HOWTO</link>
guide as it contains actual descriptions of how to use this stuff.
</p>
<section title="Index of Features">
<ul>
<li><link href="#NewWorkbook">How to create a new workbook</link></li>
<li><link href="#NewSheet">How to create a sheet</link></li>
<li><link href="#CreateCells">How to create cells</link></li>
<li><link href="#CreateDateCells">How to create date cells</link></li>
<li><link href="#CellTypes">Working with different types of cells</link></li>
<li><link href="#Alignment">Aligning cells</link></li>
<li><link href="#Borders">Working with borders</link></li>
<li><link href="#FrillsAndFills">Fills and color</link></li>
<li><link href="#MergedCells">Merging cells</link></li>
<li><link href="#WorkingWithFonts">Working with fonts</link></li>
<li><link href="#ReadWriteWorkbook">Reading and writing</link></li>
<li><link href="#NewLinesInCells">Use newlines in cells.</link></li>
<li><link href="#DataFormats">Create user defined data formats.</link></li>
<li><link href="#PrintArea">Set print area for a sheet.</link></li>
<li><link href="#FooterPageNumbers">Set page numbers on the footer of a sheet.</link></li>
</ul>
</section>
<section title="Features">
<anchor id="NewWorkbook"/>
<section title="New Workbook">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="NewSheet"/>
<section title="New Sheet">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
HSSFSheet sheet2 = wb.createSheet("second sheet");
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CreateCells"/>
<section title="Creating Cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short)0);
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short)0);
cell.setCellValue(1);
// Or do it on one line.
row.createCell((short)1).setCellValue(1.2);
row.createCell((short)2).setCellValue("This is a string");
row.createCell((short)3).setCellValue(true);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CreateDateCells"/>
<section title="Creating Date Cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short)0);
// Create a cell and put a date value in it. The first cell is not styled
// as a date.
HSSFCell cell = row.createCell((short)0);
cell.setCellValue(new Date());
// we style the second cell as a date (and time). It is important to
// create a new cell style from the workbook otherwise you can end up
// modifying the built in style and effecting not only this cell but other cells.
HSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setDataFormat(HSSFDataFormat.getFormat("m/d/yy h:mm"));
cell = row.createCell((short)1);
cell.setCellValue(new Date());
cell.setCellStyle(cellStyle);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="CellTypes"/>
<section title="Working with different types of cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = sheet.createRow((short)2);
row.createCell((short) 0).setCellValue(1.1);
row.createCell((short) 1).setCellValue(new Date());
row.createCell((short) 2).setCellValue("a string");
row.createCell((short) 3).setCellValue(true);
row.createCell((short) 4).setCellType(HSSFCell.CELL_TYPE_ERROR);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="Alignment"/>
<section title="Demonstrates various alignment options">
<source>
public static void main(String[] args)
throws IOException
{
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = sheet.createRow((short) 2);
createCell(wb, row, (short) 0, HSSFCellStyle.ALIGN_CENTER);
createCell(wb, row, (short) 1, HSSFCellStyle.ALIGN_CENTER_SELECTION);
createCell(wb, row, (short) 2, HSSFCellStyle.ALIGN_FILL);
createCell(wb, row, (short) 3, HSSFCellStyle.ALIGN_GENERAL);
createCell(wb, row, (short) 4, HSSFCellStyle.ALIGN_JUSTIFY);
createCell(wb, row, (short) 5, HSSFCellStyle.ALIGN_LEFT);
createCell(wb, row, (short) 6, HSSFCellStyle.ALIGN_RIGHT);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
}
/**
* Creates a cell and aligns it a certain way.
*
* @param wb the workbook
* @param row the row to create the cell in
* @param column the column number to create the cell in
* @param align the alignment for the cell.
*/
private static void createCell(HSSFWorkbook wb, HSSFRow row, short column, short align)
{
HSSFCell cell = row.createCell(column);
cell.setCellValue("Align It");
HSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(align);
cell.setCellStyle(cellStyle);
}
</source>
</section>
<anchor id="Borders"/>
<section title="Working with borders">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short) 1);
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue(4);
// Style the cell with borders all around.
HSSFCellStyle style = wb.createCellStyle();
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBottomBorderColor(HSSFColor.BLACK.index);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setLeftBorderColor(HSSFColor.GREEN.index);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setRightBorderColor(HSSFColor.BLUE.index);
style.setBorderTop(HSSFCellStyle.BORDER_MEDIUM_DASHED);
style.setTopBorderColor(HSSFColor.BLACK.index);
cell.setCellStyle(style);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="FillsAndFrills"/>
<section title="Fills and colors">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short) 1);
// Aqua background
HSSFCellStyle style = wb.createCellStyle();
style.setFillBackgroundColor(HSSFColor.AQUA.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("X");
cell.setCellStyle(style);
// Orange "foreground", foreground being the fill foreground not the font color.
style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.ORANGE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cell = row.createCell((short) 2);
cell.setCellValue("X");
cell.setCellStyle(style);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="MergedCells"/>
<section title="Merging cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = sheet.createRow((short) 1);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("This is a test of merging");
sheet.addMergedRegion(new Region(1,(short)1,1,(short)2));
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="WorkingWithFonts"/>
<section title="Working with fonts">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
// Create a row and put some cells in it. Rows are 0 based.
HSSFRow row = sheet.createRow((short) 1);
// Create a new font and alter it.
HSSFFont font = wb.createFont();
font.setFontHeightInPoints((short)24);
font.setFontName("Courier New");
font.setItalic(true);
font.setStrikeout(true);
// Fonts are set into a style so create a new one to use.
HSSFCellStyle style = wb.createCellStyle();
style.setFont(font);
// Create a cell and put a value in it.
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("This is a test of fonts");
cell.setCellStyle(style);
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="ReadWriteWorkbook"/>
<section title="Reading and Rewriting Workbooks">
<source>
POIFSFileSystem fs =
new POIFSFileSystem(new FileInputStream("workbook.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(2);
HSSFCell cell = row.getCell((short)3);
if (cell == null)
cell = row.createCell((short)3);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue("a test");
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="UseNewLinesInCells"/>
<section title="Using newlines in cells">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
HSSFRow r = null;
HSSFCell c = null;
HSSFCellStyle cs = wb.createCellStyle();
HSSFFont f = wb.createFont();
HSSFFont f2 = wb.createFont();
cs = wb.createCellStyle();
cs.setFont( f2 );
//Word Wrap MUST be turned on
cs.setWrapText( true );
r = s.createRow( (short) 2 );
r.setHeight( (short) 0x349 );
c = r.createCell( (short) 2 );
c.setCellType( HSSFCell.CELL_TYPE_STRING );
c.setCellValue( "Use \n with word wrap on to create a new line" );
c.setCellStyle( cs );
s.setColumnWidth( (short) 2, (short) ( ( 50 * 8 ) / ( (double) 1 / 20 ) ) );
FileOutputStream fileOut = new FileOutputStream( "workbook.xls" );
wb.write( fileOut );
fileOut.close();</source>
</section>
<anchor id="DataFormats"/>
<section title="Data Formats">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFCellStyle style;
HSSFDataFormat format = wb.createDataFormat();
HSSFRow row;
HSSFCell cell;
short rowNum = 0;
short colNum = 0;
row = sheet.createRow(rowNum++);
cell = row.createCell(colNum);
cell.setCellValue(11111.25);
style = wb.createCellStyle();
style.setDataFormat(format.getFormat("0.0"));
cell.setCellStyle(style);
row = sheet.createRow(rowNum++);
cell = row.createCell(colNum);
cell.setCellValue(11111.25);
style = wb.createCellStyle();
style.setDataFormat(format.getFormat("#,##0.0000"));
cell.setCellStyle(style);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="PrintArea"/>
<section title="Set Print Area to One Page">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFPrintSetup ps = sheet.getPrintSetup()
sheet.setAutobreaks(true)
ps.setFitHeight((short)1);
ps.setFitWidth((short)1);
// Create various cells and rows for spreadsheet.
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
<anchor id="FooterPageNumbers"/>
<section title="Set Page Numbers on Footer">
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFFooter footer = sheet.getFooter()
footer.setRight( "Page " + HSSFFooter.page() + " of " + HSSFFooter.numPages() );
// Create various cells and rows for spreadsheet.
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
</source>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Record Generator HOWTO</title>
<authors>
<person email="glens@apache.org" name="Glen Stampoultzis" id="glens"/>
<person email="acoliver@apache.org" name="Andrew C. Oliver" id="acoliver"/>
</authors>
</header>
<body>
<section title="How to Use the Record Generator">
<section title="History">
<p>
The record generator was born from frustration with translating
the Excel records to Java classes. Doing this manually is a time
consuming process. It's also very easy to make mistakes.
</p>
<p>
A utility was needed to take the defintition of what a
record looked like and do all the boring stuff. Thus the
record generator was born.
</p>
</section>
<section title="Capabilities">
<p>
The record generator takes XML as input and produced the following
output:
<ul>
<li>A Java file capabile of decoding and encoding the record.</li>
<li>A test class with provides a fill-in-the-blanks implementation of a test case
for ensuring the record operates as designed.</li>
</ul>
</p>
</section>
<section title="Usage">
<p>
The record generator is invoked as an Ant target (generate-records). It goes
through looking for all files in src/records/defintitions ending with _record.xml.
It then creates two files; the Java record definition and the Java test case template.
</p>
<p>
The records themselves have the following general layout:
</p>
<source><![CDATA[
<record id="0x1032" name="Frame" package="org.apache.poi.hssf.record">
<description>The frame record indicates whether there is a border
around the displayed text of a chart.</description>
<author>Glen Stampoultzis (glens at apache.org)</author>
<fields>
<field type="int" size="2" name="border type">
<const name="regular" value="0" description="regular rectangle or no border"/>
<const name="shadow" value="1" description="rectangle with shadow"/>
</field>
<field type="int" size="2" name="options">
<bit number="0" name="auto size"
description="excel calculates the size automatically if true"/>
<bit number="1" name="auto position"
description="excel calculates the position automatically"/>
</field>
</fields>
</record>
]]></source>
<p>
Currently the type can be of type int, float or string. The 'int'
type covers bytes, shorts and integers which is selected using a
size of 1, 2 or 4. An additional type called varword is used to
represent a array of word values where the first short is the length
of the array. The string type generation is only partially
implemented. If choosing string you must select a size of 'var'.
</p>
<p>
The Java records are regenerated each time the record generator is
run, however the test stubs are only created if the test stub does
not already exist. What this means is that you may change test
stubs but not the generated records.
</p>
</section>
<section title="How it Works">
<p>
The record generation works by taking an XML file and styling it
using XLST. Given that XSLT is a little limited in some ways it was
necessary to add a little Java code to the mix.
</p>
<p>
See record.xsl, record_test.xsl, FieldIterator.java,
RecordUtil.java, RecordGenerator.java
</p>
</section>
<section title="Limitations">
<p>
The record generator does not handle all possible record types and
is not ment to. Sometimes it's going to make more sense to generate
the records manually. The main point of this thing is to make the
easy stuff simple.
</p>
<p>
Currently the record generator is optimized to create Excel records.
It could be adapted to create Word records with a little poking
around.
</p>
<p>
Currently the the XSL file that generates the record calls out to
Java objects. This would have been better done as Javascript inside
the XSL file itself. The Java code for the record generation is
currently quite messy with minimal comments.
</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>HSSF Use Cases</title>
<authors>
<person email="marc.johnson@yahoo.com" name="Marc Johnson" id="MJ"/>
</authors>
</header>
<body>
<section title="HSSF Use Cases">
<section title="Use Case 1: Read existing HSSF">
<p><strong>Primary Actor:</strong> HSSF client</p>
<p><strong>Scope:</strong> HSSF</p>
<p><strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF client- wants to read content
of HSSF file</li>
<li>HSSF - understands HSSF file</li>
<li>POIFS - understands underlying POI
file system</li>
</ul>
<p><strong>Precondition:</strong> None</p>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF client requests HSSF to read
a HSSF file, providing an InputStream
containing HSSF file in question.</li>
<li>HSSF requests POIFS to read the HSSF
file, passing the InputStream
object to POIFS (POIFS use case 1, read existing file system)</li>
<li>HSSF reads the &quot;Workbook&quot;
file (use case 4, read workbook entry)</li>
</ol>
<p><strong>Extensions:</strong></p>
<p>2a. Exceptions
thrown by POIFS will be passed on to the HSSF client.</p>
</section>
<section title="Use Case 2: Write HSSF file">
<p><strong>Primary Actor:</strong> HSSF client</p>
<p><strong>Scope:</strong> HSSF</p>
<p><strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF client- wants to write file
out.</li>
<li>HSSF - knows how to write file
out.</li>
<li>POIFS - knows how to write file
system out.</li>
</ul>
<p><strong>Precondition:</strong></p>
<ul>
<li>File has been
read (use case 1, read existing HSSF file) and subsequently modified
or file has been created (use case 3, create HSSF file)</li>
</ul>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF client
provides an OutputStream to
write the file to.</li>
<li>HSSF writes
the &quot;Workbook&quot; to its associated POIFS file system (use case
5, write workbook entry)</li>
<li>HSSF
requests POIFS to write its file system out, using the OutputStream
obtained from the HSSF client (POIFS use case 2, write file system).</li>
</ol>
<p><strong>Extensions:</strong></p>
<p>3a. Exceptions
from POIFS are passed to the HSSF client.</p>
</section>
<section title="Use Case 3:Create HSSF file">
<p><strong>Primary Actor:</strong> HSSF client</p>
<p><strong>Scope:</strong> HSSF</p>
<p>
<strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF client- wants to create a new
file.</li>
<li>HSSF - knows how to create a new
file.</li>
<li>POIFS - knows how to creat a new
file system.</li>
</ul>
<p><strong>Precondition:</strong></p>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF requests
POIFS to create a new file system (POIFS use case 3, create new file
system)</li>
</ol>
<p><strong>Extensions:</strong>
None</p>
</section>
<section title="Use Case 4: Read workbook entry">
<p><strong>Primary Actor:</strong> HSSF</p>
<p><strong>Scope:</strong> HSSF</p>
<p>
<strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF - knows how to read the
workbook entry</li>
<li>POIFS - knows how to manage the file
system.</li>
</ul>
<p><strong>Precondition:</strong></p>
<ul>
<li>The file
system has been read (use case 1, read existing HSSF file) or has
been created and written to (use case 3, create HSSF file system;
use case 5, write workbook entry).</li>
</ul>
<p><strong>Minimal
Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>
HSSF requests POIFS for the &quot;Workbook&quot; file</li>
<li>POIFS returns
an InputStream for the file.</li>
<li>HSSF reads
from the InputStream provided by POIFS</li>
<li>HSSF closes
the InputStream provided by POIFS</li>
</ol>
<p><strong>Extensions:</strong></p>
<p>3a. Exceptions
thrown by POIFS will be passed on</p>
</section>
<section title="Use Case 5: Write workbook entry">
<p><strong>Primary Actor:</strong> HSSF</p>
<p><strong>Scope:</strong> HSSF</p>
<p>
<strong>Level:</strong> Summary</p>
<p><strong>Stakeholders and Interests:</strong></p>
<ul>
<li>HSSF - knows how to manage the
write the workbook entry.</li>
<li>POIFS - knows how to manage the file
system.</li>
</ul>
<p><strong>Precondition:</strong>
</p>
<ul>
<li>Either an existing HSSF file has
been read (use case 1, read existing HSSF file) or an HSSF file has
been created (use case 3, create HSSF file).</li>
</ul>
<p><strong>Minimal Guarantee:</strong> None</p>
<p><strong>Main Success Guarantee:</strong></p>
<ol>
<li>HSSF
checks the POIFS file system directory for the &quot;Workbook&quot;
file (POIFS use case 8, read file system directory)</li>
<li>If &quot;Workbook&quot; is in the directory, HSSF requests POIFS to
replace it with the new workbook entry (POIFS use case 4, replace file
in file system). Otherwise, HSSF requests POIFS to write the new
workbook file, with the name &quot;Workbook&quot; (POIFS use case 6,
write new file to file system)</li>
</ol>
<p><strong>Extensions:</strong>None</p>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title>Bienvenido a POI</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="GJS" name="Glen Stampoultzis" email="glens@apache.org"/>
<person id="AMB" name="Agustín Martín Barbero" email="-"/>
</authors>
</header>
<body>
<section title="Noticias">
<section title="Traducciones">
<p>
El proyecto de traducción de la documentación de POI ha comenzado.
Los primeros en empezar han sido las traducciones al <link href="index.html">Español
</link>, al <link href="http://www.terra-intl.com/jakarta/poi/">Japonés</link> y al
<link href="../de/index.html">Alemán</link>.
Otras serán bienvenidas. ¡Podéis participar si queréis!
</p>
</section>
<section title="Concurso de Logotipo">
<p>
Se ha terminado el plazo de votaciones para el concurso de logotipo de POI. Gracias por vuestros votos.
</p>
<!-- <p>-->
<!-- <link href="http://vote.sparklit.com/poll.spark/640946">Pinche aquí</link> para ver los resultados actuales.-->
<!-- </p>-->
</section>
</section>
<section title="Propósito">
<p>
El proyecto POI consiste en APIs para manipular varios formatos de ficheros,
basados en el formato de Documento Compuesto OLE 2 de Microsoft, utilizando Java puro.
</p>
<p>
Entre los ficheros basados en el formato de Documento Compuesto OLE 2 de Microsoft se
incluyen la mayor parte de los ficheros de Microsoft Office tales como XLS y DOC.
</p>
<p>
Como regla general intentamos colaborar lo más posible con otros proyectos para proporcionar esta
funcionalidad. Algunos ejemplos: <link href="http://xml.apache.org/cocoon">Cocoon</link> para
el que pronto encontraréis generadores y serializadores para nuestros proyectos;
<link href="http://www.openoffice.org">Open Office.org</link> con quienes colaboramos en la
documentación del formato XLS; y <link href="http://jakarta.apache.org/lucene">Lucene</link> para
el que pronto tendremos intérpretes del formato de fichero. Cuando sea práctico, donaremos componentes
directamente a aquellos proyectos para dotarles de capacidad-POI.
</p>
<section title="¿Por qué/cuándo utilizaría POI?">
<p>
Abordaremos esto a nivel de componente. POI se refiere al proyecto completo.
</p>
<p>
Así que, ¿por qué debería utilizar POIFS o HSSF?
</p>
<p>
Utilizarías POIFS si tuvieras un documento escrito en el Formato de Documento Compuesto OLE 2, probablemente
escrito utilizando MFC, que necesitaras leer en Java. Alternativamente, utilizarías POI para escribir
en el Formato de Documento Compuesto OLE 2 si necesitaras inter-operar con programas ejecutándose en la
plataforma Windows. No nos estamos jactando cuando decimos que POIFS es la adaptación más completa y correcta
de este formato de fichero hasta la fecha.
</p>
<p>
Utilizaríás HSSF si necesitaras leer o escribir un fichero XLS (Excel) utilizando Java. También se pueden
leer y modificar hojas de cálculo utilizando este API, aunque ahora mismo la escritura está más madura.
</p>
</section>
<section title="¿Qué significa POI?">
<p>
POI significa Implementación Pobre de Ofuscación (Poor Obfuscation Implementation). ¿Por qué daríamos a
nuestro proyecto un nombre tan derogatorio? Bien, el Formato de Documento Compuesto OLE 2 de Microsoft es
algo bastante mal concebido. Esencialmente es un fichero estructurado muy a la manera del viejo sistema FAT
del DOS. Redmon eligió, en vez de utilizar tar, gzip, o arc, inventar su propio formato de fichero que no
proporciona ningún estándar de cifrado o compresión, no es fácil de unir con otros ficheros del mismo tipo, y
es dado a sufrir problemas de fragmentación.
</p>
<p>
Poi también es una delicatessen Hawaiiana que <link href="http://www.m-w.com">el diccionario Merriam Webster's</link>
define como "Comida Hawaiiana de raiz de taro cocinada, machacada y amasada en una pasta que a menudo se deja fermentar."
Esto extrañamente parecía una descripción del formato del fichero.
</p>
<p>
Así que si te gustan los acrónimos, entonces POI es un acrónimo. Si los odias, entonces sólo usamos el nombre de la
comida para nuestro proyecto. Si deseas expresar amor u odio por los acrónimos, utiliza POI o Poi respectivamente
para referirte al proyecto.
</p>
</section>
</section>
<section title="Componentes hasta Hoy">
<section title="Visión General">
<p>Un concepto erróneo es que POI escribe ficheros Excel. POI es el nombre del proyecto. POI contiene varios
componentes, uno de los cuales, HSSF, escribe ficheros Excel. Siguen a continuación los componentes del
proyecto POI completo y un pequeño sumario de su propósito.</p>
</section>
<section title="POIFS (Sistema de Ficheros POI)">
<p>POIFS es la parte más vieja y más estable del proyecto. Es nuestra adaptación del Formato de Documento Compuesto
OLE 2 a Java puro. Soporta funcionalidad de lectura y escritura. Todos nuestros componentes se sirven de él por
definición. Por favor, vea <link href="../../poifs/index.html">la página del proyecto POIFS</link> para más información.</p>
</section>
<section title="HSSF (Formato de Hoja de Cálculo Horrible)">
<p>HSSF es nuestra adaptación del formato de fichero de Microsoft Excel 97(-2002) a Java puro. Soporta lectura y
escritura. Por favor, vea <link href="../../hssf/index.html">la página del proyecto HSSF</link> para más información.</p>
</section>
<section title="HDF (Formato de Documento Horrible)">
<p>HDF es nuestra adaptación del formato de fichero de Microsoft Word 97 a Java puro. Soporta lectura y escritura.
Por favor, vea <link href="../../hdf/index.html">la página del proyecto HDF para más información</link>. Este
componente está en la fase inicial de diseño. ¡Salta dentro!</p>
</section>
<section title="HPSF (Formato de Conjunto de Propiedades Horrible)">
<p>HPSF es nuestra adaptación del formato de conjunto de propiedades OLE 2 a java puro.
Los conjuntos de propiedades se utilizan mayoritariamente para almacenar las propiedades de un documento
(título, autor, fecha de la última modificació, etc.), pero también pueden ser utilizados para propósitos
específicos de una aplicación. Actualmente HPSF soporta sólo funcionalidad de lectura. Por favor, vea
<link href="../../hpsf/index.html">la página del proyecto HPSF</link> para más información.</p>
</section>
</section>
<section title="¿Qué le ocurrió al Serializador HSSF?">
<p>El Serializador HSSF, que era parte de nuestra release 1.0 y de las últimas compilaciones en
<link href="http://www.sourceforge.net/projects/poi">Sourceforge</link>, ha sido donado al proyecto
<link href="http://xml.apache.org/cocoon/">Cocoon</link>, y está disponible a partir de la versión
2.0.2.</p>
</section>
<section title="Contribuyendo ">
<p>
¿Así que te gustaría contribuir al proyecto? ¡Genial! Necesitamos gente entusiasta, que trabaje duro,
que tenga talento para ayudarnos con el proyecto en varias áreas. ¡La primera es petición de nuevas
funciones y aviso de errores! La segunda es documentación - estaremos a tu entera disposición si
tienes alguna crítica o te gustaría contribuir o mejorar de alguna forma la documentación. ¡Especialmente
no nos vendría mal algo de ayuda en documentar el formato de fichero HSSF! ¡Por último, aunque no por ello
menos importante, nos vendría bien algunos programadores Java que mastiquen binario, para que le echen el diente
a la convolución que caracteriza los formatos de fichero de Microsoft y para que nos ayude a adaptar nuevos
formatos a una plataforma Java superior!
</p>
<p> ¡Así que si estás motivado, listo, y tienes tiempo, únete a las listas de correo y estaremos encantados de ayudarte a
empezar en el proyecto!
</p>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title></title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
<person id="AMB" name="Agustín Martín Barbero" email="-"/>
</authors>
</header>
<body>
<section title="POI en los medios de comunicación">
<p>
Estos son artículos/etc. sobre POI publicados en la red. Si ves
alguna noticia sobre POI o algún sitio en el que se le menciona
de manera notable (no en tu propia página en la que pones la palabra
POI para que enlacemos contigo y en la que casualmente hay una foto
de tu mujer e hijos) entonces envía un parche a la lista. En general
dedicaremos el mismo tiempo así que no tengáis reparos en enviar
difamaciones coléricas así como comentarios favorables, técnicos y
objetivos. No mencionaremos mensajes realmente estúpidos (lo sentimos).
</p>
</section>
<section title="Inglés">
<ul>
<li>
<link href="http://archive.midrange.com/web400/200204/msg00023.html">Discusión sobre el uso de POI en AS/400s</link>
</li>
<li>
<link href="http://www.somelist.com/mails/23819.html">Discusión de cuando casi tuvimos POI como el filtro para KOffice si asuntos de política y licencias no lo hubieran condenado al fracaso</link>
</li>
<li>
<link href="http://www.oreillynet.com/pub/wlg/1552?page=last&amp;x-showcontent=text">Discusión Java en O'Reilly Network incluyendo discusión sobre POI</link> - O'Reilly.net
</li>
<li>
<link href="http://www.rollerweblogger.org/page/roller/20020715">Poor Obfuscation Implementation (Implementación Pobre de Ofuscación).</link> - Blog de David M. Johnson
</li>
<li>
<link href="http://www.jsurfer.org/article.php?sid=322">
Descarga POI 1.5-dev-rc2 </link> - JSurfer
</li>
<li>
<link href="http://directory.google.com/Top/Computers/Programming/Languages/Java/Class_Libraries/Data_Formats/Microsoft_Formats/"> Google dice que somos los más importantes en nuestra categoría </link>
</li>
<li>
<link href="http://www.javaworld.com/javaworld/javaqa/2002-05/01-qa-0503-excel3.html">It's POI-fect</link> - Tony Sintes, Javaworld
</li>
<li>
<link href="http://www.need-a-cake.com/categories/cocoonWeblog/2002/03/07.html">
Nicola anuncia código de serialización POI
</link> - Matthew Langham's Radio Weblog
</li>
<li>
<link href="http://javalobby.org/discussionContext/showThreaded/frm/javalobby?folderId=20&amp;discussionContextId=11523">
Descarga Jakarta POI 1.4583</link> - JavaLobby
</li>
<li>
<link href="http://javalobby.org/discussionContext/showThreaded/frm/javalobby?discussionContextId=11442&amp;folderId=20">
El proyecto POI se mueve a Jakarta (OLE 2 CDF/Excel/Word en
java puro)</link> - JavaLobby
</li>
<li>
<link
href="http://www.geocities.com/marcoschmidt.geo/java-image-coding.html">
Listado de bibliotecas Java para leer y escribir ficheros de imágenes y documentos
</link> - Página de Marco Schmidt (normalmente no anunciaríamos
la página personal de nadie, pero es un listado extensivo de información
que incluye "alternativas a POI" (para aquellos que son muy ricos). ¡Pero, qué
l3ch3s, creo que voy a marcar esta página para mí puesto que tiene enlaces a
direcciones que en conjunto contienen o enlazan con todo el conocimiento de la humanidad!)
</li>
<li>
<link href="http://radio.weblogs.com/0101350/">
Experiencias de un Operador (Måns af Klercker)
</link> - radio.weblogs.com
</li>
<li>
<link href="http://dataconv.org/apps_office.html">
DATACONV - Herramientas de Conversión de Datos: Office
</link> DATACONV
</li>
<li>
<link href="http://chicago.sourceforge.net/devel/">
Página del Desarrollador de Chicago
</link>
</li>
<li>
<link href="http://www.onjava.com/pub/d/1157">
POI/Proyecto de Serialización de POI
</link> - Tío, sabes que estás en lo alto cuando le gustas a
O'Reilly. ;-)
</li>
<li>
<link
href="http://www.javaworld.com/netnews/index.shtml">
Noticias en la Red
</link> - Java World
</li>
</ul>
</section>
<section title="Nederlandstalige (Holandés)">
<ul>
<li>
<link
href="http://www.ster.be/java/java9.html">
Een Excel-werkboek maken vanuit Java - Lieven Smits
</link>
</li>
</ul>
</section>
<section title="Deutsch (Alemán)">
<ul>
<li> <link
href="http://www.entwickler.com/itr/news/show.php3?id=6132&amp;nodeid=82 ">Apache POI verffentlicht</link> - entwicker.com
</li>
<li>
<link
href="http://www.jsp-develop.de/newsletter/10/">
Apache Jakarta-Projekt bringt Word und Excel in die Java-Welt </link> - jsp-develop.de (for the misguided who use JSP ;-) )
</li>
<li>
<link
href="http://www.entwickler.com/news/2002/02/5718/news.shtml">
Neues Apache-Projekt bringt Word- und Excel nach Java
</link> - entwickler.com
</li>
</ul>
</section>
<section title="Español (Spanish)">
<ul>
<li>
<link href="http://www.javahispano.com/noticias/todas.jsp">
OLE2 desde Java nativo
</link> - javaHispano
</li>
</ul>
</section>
<section title="Francais (Francés)">
<ul>
<li>
<link href="http://linuxfr.org/section/D%E9veloppeur,0,1,8,0.html">
Excel/OLE accessibles
</link> - Da Linux French Page
</li>
<li>
<link href="http://www.sogid.com/javalist/f2002/traiter_word_java.html">Discusión sobre POI en francés</link>
</li>
</ul>
</section>
<section title="Nihongo (Japonés)">
<ul>
<li>
<link href="http://drpanda.freezope.org/Memo/docs/jakarta/poi/poi_sample">100% PureJava...</link> - Dr. Panda Portal
</li>
<li>
<link
href="http://www.gimlay.org/~andoh/java/javanew.html">
What's new with java?
</link> - gimlay.org
</li>
<li><link href="http://taka-2.com/jclass/POI/">Java?Excel?????</link> - appears to show how to use Japanese with POI</li>
<li><link href="http://www.tech-arts.co.jp/macosx/webobjects-jp/htdocs/3200/3218.html">Various discussion in Japanese including on POI</link></li>
<li><link href="http://muimi.com/j/jakarta/">Japanese resources on Jakarta projects including POI</link></li>
<li><link href="http://www.fk.urban.ne.jp/home/kishida/">Kishida's site</link> various information, includes a snip about POI and Japanese.</li>
</ul>
</section>
<section title="No sé cómo decir Ruso en Ruso (Ruso)">
<ul>
<li>
<link href="http://www.nestor.minsk.by/kg/kg02/21/kg22108.html">
Probably a translation of the Javalobby announcement of 1.5-final
</link> Java-???????
</li>
</ul>
</section>
<section title="No sé cómo de cir Coreano en Coreano (Coreano)">
<ul>
<li>
<link href="http://www.javabrain.co.kr/AnswerView?questionId=1189&amp;categoryId=8">Various discussion in Korean about Excel output/APIs including POI</link>
</li>
</ul>
</section>
<section title="Ni idea">
<p>
¡Si entiendes alguno de estos idiomas, envía un correo a la lista
diciéndonos en qué idioma está escrito y lo pondremos donde corresponda!
</p>
<ul>
<li>
<link
href="http://www.javacentrix.com/index.htm">
Si tuviera que adivinar, diría que es Tailandés, pero a lo mejor
alguno de vosotros lo sabe con seguridad.</link> - javacentrix.com
</li>
</ul>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title>Descripción General</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
<person id="AMB" name="Agustín Martín Barbero" email="-"/>
</authors>
</header>
<body>
<section title="¿Qué es?">
<p>El proyecto POI es el proyecto principal para el desarrollo de adaptaciones (ports)
en Java puro de los formatos de fichero basados en el Formato de Documento Compuesto OLE 2
de Microsoft. El Formato de Documento Compuesto OLE 2 lo utilizan los Documentos Office de
Microsoft, así como por los programas que utilizan conjuntos de propiedades MFC para serializar
sus objetos de tipo documento.
</p>
</section>
<section title="Sub-Proyectos">
<p>
Los siguientes son adaptaciones, paquetes o componentes contenidos en el proyecto POI.
</p>
<section title="POIFS">
<p>
<link href="../../poifs/index.html">POIFS</link> es el conjunto de APIs
(Interfaces de Aplicación) para la lectura y escritura del Formato de Documento Compuesto OLE 2
utilizando (únicamente) Java.
</p>
</section>
<section title="HSSF">
<p>
<link href="../../hssf/index.html">HSSF</link> es el conjunto de APIs para la lectura y
escritura de hojas de cálculo de Microsoft Excel 97(-XP) utilizando (únicamente) Java.
</p>
</section>
<section title="HDF">
<p>
<link href="../../hdf/index.html">HDF</link> es el conjunto de APIs para la lectura y
escritura de documentos Word 97(-XP) de Microsoft utilizando (únicamente) Java.
</p>
</section>
<section title="HPSF">
<p>
<link href="../../hpsf/index.html">HPSF</link> es el conjunto de APIs para la lectura
de conjuntos de propiedades utilizando (únicamente) Java.
</p>
</section>
<section title="Utilidades-POI (POI-Utils)">
<p>
<link href="../../utils/index.html">POI-Utils</link> son artefactos de propósito
general surgidos en el desarrollo de POI que no han sido implementados en ningún otro sitio.
Siempre buscamos donarlos y mantenerlos como parte de una biblioteca general utilizada en
algún otro proyecto. Estas son cosas que necesitamos para completar nuestra misión pero que
generalmente estan fuera de ella.
</p>
</section>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Poi Project All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document><header><title>Patch Queue</title><authors><person email="greenrd@hotmail.com" name="Robin Green"/><person email="barozzi@nicolaken.com" name="Nicola Ken Barozzi"/></authors></header><body><section title="Introduction"><p>
This is an <strong>informal</strong> list - in chronological order -
of some of the noteworthy patches that have been posted
to the <code>developers</code> mailing list.
These patches are not (yet) part of the Poi project, but need reviewing for possible
inclusion. This system was instituted because, due to the large volume of mail and
the lack of time of the committers, some patches tended to get forgotten about. This
queue does not guarantee that any patch will be reviewed within a reasonable time frame,
but it does at least make them easier to find!
</p><p><strong>Reviewers wanted!</strong> - If you have time to review and/or test these patches,
we would be grateful for your time. Please post comments to the dev mailing lists.
</p><p>
Before submitting a patch, please read the page on <connect href="contrib.xml">Third-Party
Contributions</connect>. The preferred submission method for patches is:
</p><ul><li>Post to Poi developers list</li><li>Describe the patch, the reason for it and (if necessary) why this is important.</li><li>Generate the patch in <code>diff -u</code> format from CVS</li><li>Also generate a documentation patch or new file, if this is something that should be documented.
</li><li>Post as an attachment rather than inline (unless it is trivially small).</li></ul><p>Following the above guidelines will facilitate your patch being reviewed
and applied efficiently.</p></section><section title="Patch Queue"><p><strong> [Under Construction] </strong> Archive links will be added later.
<strong>Please do not bother the patch submitters/authors</strong> without first reading the
relevant post(s) in the <connect href="mail-archives.xml">mailing list archives.</connect></p><p>Vapourware will not be listed.</p><table><tr><th>id</th><th>Summary</th><th>Reviewer</th><th>Resolution</th><th>Status</th></tr></table><p>See also additional list of patches to be added in <connect href="todo.xml">To Do</connect>.
</p></section></body></document>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE todo PUBLIC "-//APACHE//DTD Todo V1.1//EN" "../../dtd/todo-v11.dtd">
<todo title="Tareas Pendientes para Poi">
<devs>
<!-- in strict alphabetical order -->
<person id="AO" name="Andrew C. Oliver" email="acoliver2@users.sourceforge.net"/>
<person id="GS" name="Glen Stampoultzis" email="gstamp@iprimus.com.au"/>
<person id="MJ" name="Marc Johnson" email="mjohnson at apache dot org"/>
<person id="NKB" name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
<person id="open" name="Poi Developers" email="poi-dev@jakarta.apache.org"/>
</devs>
<actions priority="high">
<action context="code" assigned-to="NKB">
Terminar HDF
</action>
<action context="code" assigned-to="NKB">
Terminar Gráficas (Charts)
</action>
<action context="code">
Terminar Fórmulas.
</action>
</actions>
<actions priority="medium">
<action context="code">
Exponer funcionalidad de registros a bajo nivel en API de más alto nivel
</action>
<action context="code">
Implementar más tipos de registros (para otras cosas ... no estoy
seguro de lo que significará esto).
</action>
<action context="code">
Implementar más tipos de registros (para otras cosas ... no estoy
seguro de lo que significará esto).
</action>
<action context="code">
Añadir más comprobaciones evidentes (para cuando los usuarios del API
hagan cosas que &quot;no pueden&quot; hacer)
</action>
<action context="code">
Añadir soporte para gráficos embebidos y cosas similares.
</action>
<action context="code">
Crear un nuevo objeto adaptador para manejar registros MulBlank, MulRk, Rk.
</action>
<action context="code">
Añadir alguna manera de copiar hojas.
</action>
</actions>
</todo>
<!--
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
-->

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../../dtd/document-v11.dtd">
<document>
<header>
<title>Who we are</title>
<authors>
<person name="Davanum Srinivas" email="dims@yahoo.com"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Who we are">
<p>
The Poi Project operates on a meritocracy: the more you do, the more
responsibility you will obtain. This page lists all of the people who have
gone the extra mile and are Committers. If you would like to get involved,
the first step is to join the mailing lists.
</p>
<p>
We ask that you please do not send us emails privately asking for support.
We are non-paid volunteers who help out with the project and we do not
necessarily have the time or energy to help people on an individual basis.
Instead, we have set up mailing lists which often contain hundreds of
individuals who will help answer detailed requests for help. The benefit of
using mailing lists over private communication is that it is a shared
resource where others can also learn from common mistakes and as a
community we all grow together.
</p>
<section title="Advisors">
<ul>
<li><link href="http://jakarta.apache.org/avalon/authors/stefano.html">Stefano Mazzocchi</link> (stefano at apache dot org)
</li>
</ul>
</section>
<section title="Committers">
<ul>
<li><link href="http://trilug.org/~acoliver">Andrew C. Oliver</link> (acoliver at apache dot org)</li>
<li><link href="http://www.marcj.com">Marc Johnson</link> (mjohnson at apache dot org)</li>
<li>Glen Stampoultzis (glens at apache.org)</li>
<li><link href="http://www.rainer-klute.de/">Rainer Klute</link> (klute at apache dot org)</li>
<li>Nicola Ken Barozzi (barozzi at nicolaken dot com)</li>
<li>Ryan Ackley (sackley at apache dot org)</li>
<li>Avik Sengupta (avik at apache dot org)</li>
</ul>
</section>
<section title="Developers">
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Welcome to POI</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="Purpose">
<p>This document hopes to serve as a general introduction and helpful set of
guidelines for translating POI documentation into other languages. We hope
to capture both general information here (such as "how do I test my changes")
as well as language specific guidelines and translation conventions.</p>
</section>
<section title="Introduction">
<p>
POI's XML based documentation is built along side the sources. To build poi's documentation
you run "./build.sh docs" (UNIX/cygwin) or "build docs" (Windows) from the jakarta-poi
directory. This will put the documentation under the build/docs directory, you can navigate
there using your browser generally by typing in the path name or File -&gt; Open new web location
(or some similar wording)
and browsing to the "index.html" file. You may also want to run "./build.sh clean docs" or
"build clean docs" so that all documentation previously built is erased before running the build.
The words "clean" and "docs" are called "targets", from here on out we will refer to them as
"targets" in which case you may assume you type "./build.sh" or "build" before them in order to
execute them.
</p>
<p>
To generate all of teh documentation such as it would appear on the
<link href="http://jakarta.apache.org/poi">POI Website</link> you can execute the "site" target (optionally
preceeded by the "clean" target.
</p>
<p>
The source for POI's XML documentation is in src/documentation/xdocs. To edit one of these files you can use
a standard text editor. Translated documentation is under src/documentation/xdocs/trans/xx, where xx is a
two to three letter country code, in general this should match the internet domain suffix of the country where
that language generally evolved or just be generally recognizable and unique. The directory structure under
src/documentation/trans/xx should match the structure of src/documentation (the English edition) minus the
trans directory.
</p>
<p>
The translated documentation should match the content and meaning of the "master" or English documentation.
All documentation should originate in English (this is for simplicity). While documentation written in other
languages is certainly welcome, it must first be translated (perhaps by posting it to the mail list and
requesting it be translated) into English and applied to the master before being applied to a translation.
</p>
<p>
We prefer you donate translations directly to the <link href="http://jakarta.apache.org/poi">Jakarta POI</link>
project rather than hosting them offsite. We will make every effort to accomidate you as we greatly appreciate your
efforts. However, we understand that sites located within a country are the fastest and most searchable. Therefore,
we recommend and welcome folks mirroring the POI site and making the translated page the home page. You can do this
either via an HTML copy with some <link href="http://httpd.apache.org/info/how-to-mirror.html">appropriate software</link>
or the preferred method of executing the POI build directly. You can contact us via the mail list for both push and
pull options. The same scripts which regenerate the POI website every 2 hours, should work for others. These are not
yet in CVS as they are nasty dirty shell scripts ;-). If you mirror us, tell us so we can link you. (This will help google
associate you strongly with the project)
</p>
<p>
Submitting translations is simple, you follow the same
<link href="http://jakarta.apache.org/poi/getinvolved/index.html">instructions</link> as you would for submitting a code patch.
Remeber to always generate patchs in diff -u format preserving the context relative to the jakarta-poi directory. Also remember
to submit any new files in a directory preserving archive format. Never post these to the list, always use
<link href="http://nagoya.apache.org/bugzilla/buglist.cgi?product=POI&amp;short_desc=%5BPATCH%5D&amp;short_desc_type=allwordssubstr">Bugzilla</link>
and create attachments per the above linked instructions.
</p>
</section>
<section title="Credits">
<p>
Some people feel uncomfortable putting themselves in the &lt;authors&gt; tags at the top of the documentation as they feel that
translation does not give them the right to claim authorship. Please don't feel this way, please add yourself to the authors
tags. It can be assumed that authors on the master documentation are all content creators and any additional authors listed
on the translation that are not on the master document are translators of the documentation. You authored the xx language
version of the document and should freely add yourself there. Additionally, please supply a patch to the
<link href="../who.html">Who We Are</link> page noting you as a developer once you've submitted a few translation patches. You deserve
credit and it helps the project to give you credit. Remember documentation is on par with code contribution.
</p>
</section>
<section title="Starting a new translation">
<p>
To start a translation for a language not already in existance you must create a directory under src/documentation/xdocs/trans with a
two or three letter designation of the country where the language originated. (For example es = Spanish, de = German)
Copy the book.xml and index.xml file from src/documentation/xdocs directory into the src/documentation/xdocs/trans/xx directory.
Change all paths in the book.xml and index.xml to match the relative location of the English version. For example if there is a
link in index.html that references ./poifs/index.html, you'd change that to ../../poifs/index.html (up 2 directories from trans/xx).
Create a link from the book.xml file in the src/documentation/trans directory (this is necessary or the build will ignore your
documentation) similar to the other languages.
Run the clean target followed by the docs target. If the build is successful, congradulations! If it fails, you probably got one of
the relative paths incorrect! Go fix it (the first error message generally contains the most useful information). If you need help
post to the poi-dev list and ask for it (send the output from the build).
</p>
<p>
So now you have a directory with a copy of the index from the master documentation...so what? Well now translate book.xml and index.xml.
Try to build again. It probably won't work. Why? The encoding. At the top of every file there is an encoding="UTF-8" (in general).
This encoding will work for many Western European languages, but not for others, or will require some nasty escape sequencing. This is
where trial and error + guess work come in. This <link
href="http://www.ibiblio.org/xml/books/xmljava/chapters/ch03s03.html#encoding_table">Table of encodings</link> may help. There is a
catch. Your encoding should work on a Linux system under Java 1.3.1 and of course with the build in general. If in doubt, ask.
(This is a practical consideration as thats the setup of the machine currently running the nightly/site builds.)
</p>
</section>
<section title="Need help?">
<p>
Andy Oliver is the cofounder of the POI project and one of its most active documentation contributers. Well, Andy used to think he
spoke very clearly until he traveled abroad and discovered his speech was composed almost entirely of coloquialisms. This can make some
of the POI documentation difficult to translate, if in doubt...ask. Its also appropriate to eliminate these from the master documentation
where it makes it clearer.
</p>
</section>
<section title="Translation Conventions">
<p>
In addition to the above practical guidelines we hope to come up with a set of translation guidelines here (or linked from here) for
general use as well as language specific translation guidelines and conventions. We assume that the POI translators will document
them here as they develop.
</p>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>POI Documentation Translations</title>
<authors>
<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="Introduction">
<p>
The POI project has always had a very international following. In fact even today POI is
more popular in Europe than in the US where the original founders reside. Today POI is
developed by people from all over the world including India, Austrailia, Japan, and Russia.
We recognize and welcome our geographically and culturally diverse users and contributors and
wish to accomidate you as best as we can.
</p>
<p>
Documentation has always been a cornerstone to POI's success. No matter how fluent one is in
a second language, it is always easier to comprehend concepts explained in one's native language,
therefore, we encourage volunteers to come and help us translate the documentation into other
languages. Below is a list of the translations that are currently in progress and their status.
</p>
</section>
<section title="Languages">
<table>
<tr><td>xx</td><td>Language</td><td>Status</td><td>On/Offsite</td><td>Link</td></tr>
<tr><td>de</td><td>German</td><td>Just beginning (help!)</td><td>On</td>
<td><link href="de/index.html">link</link></td></tr>
<tr><td>es</td><td>Spanish</td><td>Index page, some auxiliary pages translated</td><td>On</td>
<td><link href="es/index.html">link</link></td></tr>
<tr><td>jp</td><td>Japanese</td><td>Complete XML translation, a few releases old</td><td>Off</td>
<td><link href="http://www.terra-intl.com/jakarta/poi/">link</link></td></tr>
</table>
</section>
</body>
<footer>
<legal>
Copyright (c) @year@ The Apache Software Foundation All rights reserved.
$Revision$ $Date$
</legal>
</footer>
</document>

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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
<book software="Poi Project"
title="Poi Utils"
copyright="@year@ Poi Project">
<menu label="Navigation">
<menu-item label="Main" href="../index.html"/>
</menu>
<menu label="POI Util">
<menu-item label="Overview" href="index.html"/>
<menu-item label="Logging" href="logging.html"/>
</menu>
</book>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Poi Utils</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Overview">
<p>The POI Utils are classes we're looking to donate elsewhere and include.
These are usually classes that while are required for our mission,
are somehow outside of it. General utilities that could be used in
any project are what we would normally put here. If you see one, and you
think "gee that would be great as part of X project" then let us know.
While we wish to put these in their rightful place, we also don't want to
include a 40mb jar file just to process text strings, so that will
be a consideraton.
</p>
<p>
Currently, we're looking into which subprojects in the Jakarta Commons project
to donate these too. The "Poi Utils" package won't go away, as there may
be later classes. The idea is that "go ahead and add it, we'll merge it or
find an alternative later, just keep pounding out that poi!"
</p>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
<document>
<header>
<title>Poi Utils</title>
<subtitle>Overview</subtitle>
<authors>
<person name="Nicola Ken Barozzi" email="nicolaken@apache.org"/>
<person name="Andrew C. Oliver" email="acoliver@apache.org"/>
</authors>
</header>
<body>
<section title="Logging">
<p>
Logging in POI is used only as a debugging mechanism, not a normal runtime
logging system. Logging is ONLY for autopsie type debugging, and should
NEVER be enabled on a production system. Enabling logging will reduce
performance by at least a factor of 100. If you are not developing
POI or trying to debug why POI isn't reading a file correctly, then DO
NOT enable logging. You've been warned.
</p>
<p>
Hence, we need to be able to easily disable it entirely and make POI not dependent
on any logging package.
</p>
<warning>
POI is not dependent on commons-logging for running, but not for compiling.
</warning>
<section title="Logging Overview">
<p>
Every class uses a <code>POILogger</code> to log, and gets it using a static method
of the <code>POILogFactory</code> .
</p>
<p>
The <code>POILogFactory</code> uses the <code>NullLogger</code> by default;
it can be instructed to use any other <code>POILogger</code> implementation
by setting the system property <code>org.apache.poi.util.POILogger</code>.
</p>
<note> java -Dorg.apache.poi.util.POILogger=the.package.of.MyPoiLoggerImpl ProgramThatUsesPoi
</note>
<fixme author="nicolaken"> Still needs testing.
</fixme>
</section>
<section title="POILogFactory">
<p>
Each class in POI can get its <code>POILogger</code> by calling a static method
of the <code>POILogFactory</code> .
</p>
</section>
<section title="POILogger">
<p>
Each class in POI can log using a <code>POILogger</code>, which is an abstract class.
We decided to make our own logging facade because:</p>
<ol>
<li>we need to log many values and we put many methods in this class to facilitate the
programmer, without having him write string concatenations;</li>
<li>we need to be able to use POI without any logger package present.</li>
</ol>
<p>There are three implementations available, and you can roll out your own, just
extend <code>org.apache.poi.util.POILogger</code>.
</p>
<section title="NullLogger">
<p>Discards every logging request.</p>
</section>
<section title="SystemOutLogger">
<p>Sends every logging request to System.out.</p>
</section>
<section title="CommonsLogger">
<p>Sends every logging request to the Commons Logging package. This can use JDK1.4 logging,
log4j, logkit, and is an actively maintained Jakarta Project.</p>
</section>
</section>
</section>
</body>
</document>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "./dtd/document-v11.dtd">
<document>
<header>
<title>Who we are</title>
<authors>
<person name="Davanum Srinivas" email="dims@yahoo.com"/>
<person name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
</authors>
</header>
<body>
<section title="Who we are">
<p>
The Poi Project operates on a meritocracy: the more you do, the more
responsibility you will obtain. This page lists all of the people who have
gone the extra mile and are Committers. If you would like to get involved,
the first step is to join the mailing lists.
</p>
<p>
We ask that you please do not send us emails privately asking for support.
We are non-paid volunteers who help out with the project and we do not
necessarily have the time or energy to help people on an individual basis.
Instead, we have set up mailing lists which often contain hundreds of
individuals who will help answer detailed requests for help. The benefit of
using mailing lists over private communication is that it is a shared
resource where others can also learn from common mistakes and as a
community we all grow together.
</p>
<section title="Advisors">
<ul>
<li><link href="http://jakarta.apache.org/avalon/authors/stefano.html">Stefano Mazzocchi</link> (stefano at apache dot org)
</li>
</ul>
</section>
<section title="Committers">
<ul>
<li><link href="http://trilug.org/~acoliver">Andrew C. Oliver</link> (acoliver at apache dot org)</li>
<li><link href="http://www.marcj.com">Marc Johnson</link> (mjohnson at apache dot org)</li>
<li><link href="http://members.iinet.net.au/~gstamp/glen/">Glen Stampoultzis</link> (glens at apache.org)</li>
<li><link href="http://www.rainer-klute.de/">Rainer Klute</link> (klute at apache dot org)</li>
<li>Nicola Ken Barozzi (barozzi at nicolaken dot com)</li>
<li>Ryan Ackley (sackley at apache dot org)</li>
<li>Avik Sengupta (avik at apache dot org)</li>
<li>Shawn Laubach (slaubach at apache dot org)</li>
</ul>
</section>
<section title="Developers">
<ul>
<li>Jason Height (jheight at chariot dot net dot au)</li>
<li>Agustin Martin (agusmba at terra dot es)</li>
</ul>
</section>
</section>
</body>
</document>