Start on HSSFOptimiser, which removes un-needed cell styles and fonts, fixing up references as it does so

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@677041 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2008-07-15 21:15:16 +00:00
parent 029a5be2ac
commit 9cb74f87fe
8 changed files with 372 additions and 2 deletions

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@ -37,6 +37,7 @@
<!-- Don't forget to update status.xml too! -->
<release version="3.1.1-alpha1" date="2008-??-??">
<action dev="POI-DEVELOPERS" type="add">New helper, HSSFOptimiser, which handles removing duplicated font and style records, to avoid going over the limits in Excel</action>
<action dev="POI-DEVELOPERS" type="fix">45322 - Fixed NPE in HSSFSheet.autoSizeColumn() when cell number format was not found</action>
<action dev="POI-DEVELOPERS" type="add">45380 - Missing return keyword in ArrayPtg.toFormulaString()</action>
<action dev="POI-DEVELOPERS" type="add">44958 - Record level support for Data Tables. (No formula parser support though)</action>

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@ -34,6 +34,7 @@
<!-- Don't forget to update changes.xml too! -->
<changes>
<release version="3.1.1-alpha1" date="2008-??-??">
<action dev="POI-DEVELOPERS" type="add">New helper, HSSFOptimiser, which handles removing duplicated font and style records, to avoid going over the limits in Excel</action>
<action dev="POI-DEVELOPERS" type="fix">45322 - Fixed NPE in HSSFSheet.autoSizeColumn() when cell number format was not found</action>
<action dev="POI-DEVELOPERS" type="add">45380 - Missing return keyword in ArrayPtg.toFormulaString()</action>
<action dev="POI-DEVELOPERS" type="add">44958 - Record level support for Data Tables. (No formula parser support though)</action>

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@ -439,6 +439,23 @@ public class UnicodeString
this.field_5_ext_rst = ext_rst;
}
/**
* Swaps all use in the string of one font index
* for use of a different font index.
* Normally only called when fonts have been
* removed / re-ordered
*/
public void swapFontUse(short oldFontIndex, short newFontIndex) {
Iterator i = field_4_format_runs.iterator();
while(i.hasNext()) {
FormatRun run = (FormatRun)i.next();
if(run.fontIndex == oldFontIndex) {
run.fontIndex = newFontIndex;
}
}
}
/**
* unlike the real records we return the same as "getString()" rather than debug info
* @see #getDebugInfo()

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@ -0,0 +1,178 @@
/* ====================================================================
Copyright 2002-2004 Apache Software Foundation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hssf.usermodel;
import java.util.HashSet;
import java.util.Iterator;
import org.apache.poi.hssf.record.ExtendedFormatRecord;
import org.apache.poi.hssf.record.FontRecord;
import org.apache.poi.hssf.record.UnicodeString;
/**
* Excel can get cranky if you give it files containing too
* many (especially duplicate) objects, and this class can
* help to avoid those.
* In general, it's much better to make sure you don't
* duplicate the objects in your code, as this is likely
* to be much faster than creating lots and lots of
* excel objects+records, only to optimise them down to
* many fewer at a later stage.
* However, sometimes this is too hard / tricky to do, which
* is where the use of this class comes in.
*/
public class HSSFOptimiser {
/**
* Goes through the Workbook, optimising the fonts by
* removing duplicate ones.
* For now, only works on fonts used in {@link HSSFCellStyle}
* and {@link HSSFRichTextString}. Any other font uses
* (eg charts, pictures) may well end up broken!
* This can be a slow operation, especially if you have
* lots of cells, cell styles or rich text strings
* @param workbook The workbook in which to optimise the fonts
*/
public static void optimiseFonts(HSSFWorkbook workbook) {
// Where each font has ended up, and if we need to
// delete the record for it. Start off with no change
short[] newPos =
new short[workbook.getWorkbook().getNumberOfFontRecords()+1];
boolean[] zapRecords = new boolean[newPos.length];
for(int i=0; i<newPos.length; i++) {
newPos[i] = (short)i;
zapRecords[i] = false;
}
// Get each font record, so we can do deletes
// without getting confused
FontRecord[] frecs = new FontRecord[newPos.length];
for(int i=0; i<newPos.length; i++) {
// There is no 4!
if(i == 4) continue;
frecs[i] = workbook.getWorkbook().getFontRecordAt(i);
}
// Loop over each font, seeing if it is the same
// as an earlier one. If it is, point users of the
// later duplicate copy to the earlier one, and
// mark the later one as needing deleting
// Note - don't change built in fonts (those before 5)
for(int i=5; i<newPos.length; i++) {
// Check this one for being a duplicate
// of an earlier one
int earlierDuplicate = -1;
for(int j=0; j<i && earlierDuplicate == -1; j++) {
if(j == 4) continue;
FontRecord frCheck = workbook.getWorkbook().getFontRecordAt(j);
if(frCheck.sameProperties(frecs[i])) {
earlierDuplicate = j;
}
}
// If we got a duplicate, mark it as such
if(earlierDuplicate != -1) {
newPos[i] = (short)earlierDuplicate;
zapRecords[i] = true;
}
}
// Update the new positions based on
// deletes that have occurred between
// the start and them
// Only need to worry about user fonts
for(int i=5; i<newPos.length; i++) {
// Find the number deleted to that
// point, and adjust
short preDeletePos = newPos[i];
short newPosition = preDeletePos;
for(int j=0; j<preDeletePos; j++) {
if(zapRecords[j]) newPosition--;
}
// Update the new position
newPos[i] = newPosition;
}
// Zap the un-needed user font records
for(int i=5; i<newPos.length; i++) {
if(zapRecords[i]) {
workbook.getWorkbook().removeFontRecord(
frecs[i]
);
}
}
// Tell HSSFWorkbook that it needs to
// re-start its HSSFFontCache
workbook.resetFontCache();
// Update the cell styles to point at the
// new locations of the fonts
for(int i=0; i<workbook.getWorkbook().getNumExFormats(); i++) {
ExtendedFormatRecord xfr = workbook.getWorkbook().getExFormatAt(i);
xfr.setFontIndex(
newPos[ xfr.getFontIndex() ]
);
}
// Update the rich text strings to point at
// the new locations of the fonts
// Remember that one underlying unicode string
// may be shared by multiple RichTextStrings!
HashSet doneUnicodeStrings = new HashSet();
for(int sheetNum=0; sheetNum<workbook.getNumberOfSheets(); sheetNum++) {
HSSFSheet s = workbook.getSheetAt(sheetNum);
Iterator rIt = s.rowIterator();
while(rIt.hasNext()) {
HSSFRow row = (HSSFRow)rIt.next();
Iterator cIt = row.cellIterator();
while(cIt.hasNext()) {
HSSFCell cell = (HSSFCell)cIt.next();
if(cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
HSSFRichTextString rtr = cell.getRichStringCellValue();
UnicodeString u = rtr.getRawUnicodeString();
// Have we done this string already?
if(! doneUnicodeStrings.contains(u)) {
// Update for each new position
for(short i=5; i<newPos.length; i++) {
if(i != newPos[i]) {
u.swapFontUse(i, newPos[i]);
}
}
// Mark as done
doneUnicodeStrings.add(u);
}
}
}
}
}
}
/**
* Goes through the Wokrbook, optimising the cell styles
* by removing duplicate ones.
* For best results, optimise the fonts via a call to
* {@link #optimiseFonts(HSSFWorkbook)} first.
* @param workbook The workbook in which to optimise the cell styles
*/
public static void optimiseCellStyles(HSSFWorkbook workbook) {
}
}

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@ -67,7 +67,7 @@ public class HSSFRichTextString
/** Called whenever the unicode string is modified. When it is modified
* we need to create a new SST index, so that other LabelSSTRecords will not
* be affected by changes tat we make to this string.
* be affected by changes that we make to this string.
*/
private UnicodeString cloneStringIfRequired() {
if (book == null)
@ -167,11 +167,26 @@ public class HSSFRichTextString
return string.getString();
}
/** Used internally by the HSSFCell to get the internal string value*/
/**
* Used internally by the HSSFCell to get the internal
* string value.
* Will ensure the string is not shared
*/
UnicodeString getUnicodeString() {
return cloneStringIfRequired();
}
/**
* Returns the raw, probably shared Unicode String.
* Used when tweaking the styles, eg updating font
* positions.
* Changes to this string may well effect
* other RichTextStrings too!
*/
UnicodeString getRawUnicodeString() {
return string;
}
/** Used internally by the HSSFCell to set the internal string value*/
void setUnicodeString(UnicodeString str) {
this.string = str;

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@ -1074,6 +1074,16 @@ public class HSSFWorkbook extends POIDocument
return retval;
}
/**
* Reset the fonts cache, causing all new calls
* to getFontAt() to create new objects.
* Should only be called after deleting fonts,
* and that's not something you should normally do
*/
protected void resetFontCache() {
fonts = new Hashtable();
}
/**
* create a new Cell style and add it to the workbook's style table
* @return the new Cell Style object

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@ -47,6 +47,7 @@ public class AllUserModelTests {
result.addTestSuite(TestHSSFDateUtil.class);
result.addTestSuite(TestHSSFHeaderFooter.class);
result.addTestSuite(TestHSSFHyperlink.class);
result.addTestSuite(TestHSSFOptimiser.class);
result.addTestSuite(TestHSSFPalette.class);
result.addTestSuite(TestHSSFPatriarch.class);
result.addTestSuite(TestHSSFPicture.class);

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@ -0,0 +1,147 @@
/* ====================================================================
Copyright 2002-2004 Apache Software Foundation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hssf.usermodel;
import junit.framework.TestCase;
public class TestHSSFOptimiser extends TestCase {
public void testDoesNoHarmIfNothingToDo() throws Exception {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFFont f = wb.createFont();
f.setFontName("Testing");
HSSFCellStyle s = wb.createCellStyle();
s.setFont(f);
assertEquals(5, wb.getNumberOfFonts());
assertEquals(22, wb.getNumCellStyles());
// Optimise fonts
HSSFOptimiser.optimiseFonts(wb);
assertEquals(5, wb.getNumberOfFonts());
assertEquals(22, wb.getNumCellStyles());
assertEquals(f, s.getFont(wb));
// Optimise styles
// HSSFOptimiser.optimiseCellStyles(wb);
assertEquals(5, wb.getNumberOfFonts());
assertEquals(22, wb.getNumCellStyles());
assertEquals(f, s.getFont(wb));
}
public void testOptimiseFonts() throws Exception {
HSSFWorkbook wb = new HSSFWorkbook();
// Add 6 fonts, some duplicates
HSSFFont f1 = wb.createFont();
f1.setFontHeight((short)11);
f1.setFontName("Testing");
HSSFFont f2 = wb.createFont();
f2.setFontHeight((short)22);
f2.setFontName("Also Testing");
HSSFFont f3 = wb.createFont();
f3.setFontHeight((short)33);
f3.setFontName("Unique");
HSSFFont f4 = wb.createFont();
f4.setFontHeight((short)11);
f4.setFontName("Testing");
HSSFFont f5 = wb.createFont();
f5.setFontHeight((short)22);
f5.setFontName("Also Testing");
HSSFFont f6 = wb.createFont();
f6.setFontHeight((short)66);
f6.setFontName("Also Unique");
// Use all three of the four in cell styles
HSSFCellStyle cs1 = wb.createCellStyle();
cs1.setFont(f1);
assertEquals(5, cs1.getFontIndex());
HSSFCellStyle cs2 = wb.createCellStyle();
cs2.setFont(f4);
assertEquals(8, cs2.getFontIndex());
HSSFCellStyle cs3 = wb.createCellStyle();
cs3.setFont(f5);
assertEquals(9, cs3.getFontIndex());
HSSFCellStyle cs4 = wb.createCellStyle();
cs4.setFont(f6);
assertEquals(10, cs4.getFontIndex());
// And three in rich text
HSSFSheet s = wb.createSheet();
HSSFRow r = s.createRow(0);
HSSFRichTextString rtr1 = new HSSFRichTextString("Test");
rtr1.applyFont(0, 2, f1);
rtr1.applyFont(3, 4, f2);
r.createCell((short)0).setCellValue(rtr1);
HSSFRichTextString rtr2 = new HSSFRichTextString("AlsoTest");
rtr2.applyFont(0, 2, f3);
rtr2.applyFont(3, 5, f5);
rtr2.applyFont(6, 8, f6);
r.createCell((short)1).setCellValue(rtr2);
// Check what we have now
assertEquals(10, wb.getNumberOfFonts());
assertEquals(25, wb.getNumCellStyles());
// Optimise
HSSFOptimiser.optimiseFonts(wb);
// Check font count
assertEquals(8, wb.getNumberOfFonts());
assertEquals(25, wb.getNumCellStyles());
// Check font use in cell styles
assertEquals(5, cs1.getFontIndex());
assertEquals(5, cs2.getFontIndex()); // duplicate of 1
assertEquals(6, cs3.getFontIndex()); // duplicate of 2
assertEquals(8, cs4.getFontIndex()); // two have gone
// And in rich text
// RTR 1 had f1 and f2, unchanged
assertEquals(5, r.getCell(0).getRichStringCellValue().getFontAtIndex(0));
assertEquals(5, r.getCell(0).getRichStringCellValue().getFontAtIndex(1));
assertEquals(6, r.getCell(0).getRichStringCellValue().getFontAtIndex(3));
assertEquals(6, r.getCell(0).getRichStringCellValue().getFontAtIndex(4));
// RTR 2 had f3 (unchanged), f5 (=f2) and f6 (moved down)
assertEquals(7, r.getCell(1).getRichStringCellValue().getFontAtIndex(0));
assertEquals(7, r.getCell(1).getRichStringCellValue().getFontAtIndex(1));
assertEquals(6, r.getCell(1).getRichStringCellValue().getFontAtIndex(3));
assertEquals(6, r.getCell(1).getRichStringCellValue().getFontAtIndex(4));
assertEquals(8, r.getCell(1).getRichStringCellValue().getFontAtIndex(6));
assertEquals(8, r.getCell(1).getRichStringCellValue().getFontAtIndex(7));
}
}