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Patch 55612 - Performance improvement in HSSFCellStyle.getDataFormatString() 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1535810 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2013-10-25 18:41:24 +00:00
parent 5ad89d96b6
commit 616238f8e2
1 changed files with 28 additions and 1 deletions
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29
src/java/org/apache/poi/hssf/usermodel/HSSFCellStyle.java
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@ -18,9 +18,13 @@
package org.apache.poi.hssf.usermodel;
import java.util.Arrays;
import java.util.List;
import org.apache.poi.hssf.model.InternalWorkbook;
import org.apache.poi.hssf.record.ExtendedFormatRecord;
import org.apache.poi.hssf.record.FontRecord;
import org.apache.poi.hssf.record.FormatRecord;
import org.apache.poi.hssf.record.StyleRecord;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.CellStyle;
@ -104,9 +108,26 @@ public final class HSSFCellStyle implements CellStyle {
* @see org.apache.poi.hssf.usermodel.HSSFDataFormat
* @return the format string or "General" if not found
*/
private static short lastDateFormat = Short.MIN_VALUE;
private static List<FormatRecord> lastFormats = null;
private static String getDataFormatStringCache = null;
public String getDataFormatString() {
return getDataFormatString(_workbook);
if (getDataFormatStringCache != null) {
if (lastDateFormat == getDataFormat() && _workbook.getFormats().equals(lastFormats)) {
return getDataFormatStringCache;
}
}
lastFormats = _workbook.getFormats();
lastDateFormat = getDataFormat();
getDataFormatStringCache = getDataFormatString(_workbook);
return getDataFormatStringCache;
}
/**
* Get the contents of the format string, by looking up
* the DataFormat against the supplied workbook
@ -826,6 +847,11 @@ public final class HSSFCellStyle implements CellStyle {
// Handle matching things if we cross workbooks
if(_workbook != source._workbook) {
lastDateFormat = Short.MIN_VALUE;
lastFormats = null;
getDataFormatStringCache = null;
// Then we need to clone the format string,
// and update the format record for this
short fmt = (short)_workbook.createFormat(source.getDataFormatString() );
@ -872,4 +898,5 @@ public final class HSSFCellStyle implements CellStyle {
}
return false;
}
}