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Documented (a bit) the record generator.
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352161 13f79535-47bb-0310-9956-ffa450edef68
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Glen Stampoultzis
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@ -12,6 +12,7 @@
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<menu label="HSSF">
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<menu label="HSSF">
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<menu-item label="HOWTO" href="how-to.html"/>
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<menu-item label="HOWTO" href="how-to.html"/>
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<menu-item label="Use Case" href="use-case.html"/>
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<menu-item label="Use Case" href="use-case.html"/>
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<menu-item label="Record Generator" href="record-generator.html"/>
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</menu>
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</menu>
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</book>
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</book>
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@ -0,0 +1,98 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.0//EN" "../dtd/document-v10.dtd">
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<document>
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<header>
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<title>Record Generator HOWTO</title>
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<authors>
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<person email="glens@apache.org" name="Glen Stampoultzis" id="glens"/>
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</authors>
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</header>
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<body>
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<s1 title="How to Use the Record Generator">
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<s2 title="History">
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<p>
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The record generator was born from my frustration with translating
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the Excel records to Java classes. Doing this manually is a time
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consuming process. It's also very easy to make mistakes.
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</p>
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<p>
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I wanted something that would take the defintition of what a
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record looked like and do all the boring stuff for me. Thus the
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record generator was born.
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</p>
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</s2>
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<s2 title="Capabilities">
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<p>
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The record generator takes XML as input and produced the following
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output:
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<ul>
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<li>A java file capabile of decoding and encoding the record.</li>
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<li>A test class with provides a fill-in-the-blanks implementation of a test case
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for ensuring the record operates as designed.</li>
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</ul>
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</p>
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</s2>
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<s2 title="Usage">
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<p>
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The record generator is invoked as an Ant target (generate-records). It goes
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through looking for all files in src/records/defintitions ending with _record.xml.
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It then creates two files; the Java record definition and the Java test case template.
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</p>
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<p>
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The records themselves have the following general layout:
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</p>
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<source><![CDATA[
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<record id="0x1032" name="Frame" package="org.apache.poi.hssf.record">
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<description>The frame record indicates whether there is a border around the displayed text of a chart.</description>
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<author>Glen Stampoultzis (glens at apache.org)</author>
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<fields>
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<field type="int" size="2" name="border type">
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<const name="regular" value="0" description="regular rectangle or no border"/>
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<const name="shadow" value="1" description="rectangle with shadow"/>
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</field>
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<field type="int" size="2" name="options">
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<bit number="0" name="auto size" description="excel calculates the size automatically if true"/>
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<bit number="1" name="auto position" description="excel calculates the position automatically"/>
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</field>
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</fields>
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</record>
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]]></source>
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<p>
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The Java records are regenerated each time the record generator is run, however the test stubs are
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only created if the test stub does not already exist. What this means is that you may change
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test stubs but not the generated records.
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</p>
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</s2>
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<s2 title="How it Works">
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<p>
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TODO: Fill this out more
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</p>
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<p>
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See record.xsl, record_test.xsl, FieldIterator.java, RecordUtil.java, RecordGenerator.java
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</p>
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<p>
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</p>
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</s2>
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<s2 title="Limitations">
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<p>
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The record generator does not handle all possible record types and is not ment to. Sometimes it's
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going to make more sense to generate the records manually. The main point of this thing is to
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make the easy stuff simple.
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</p>
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<p>
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Currently the record generator is optimized to create Excel records. It could be adapted to create
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Word records with a little poking around.
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</p>
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<p>
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Currently the the XSL file that generates the record calls out to java objects. This would have been
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better done as Javascript inside the XSL file itself. The java code for the record generation is
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currently quite messy with minimal comments. Sorry, I wrote it as a proof-of-concept and just went
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too far.
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</p>
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</s2>
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</s1>
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</body>
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</document>
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