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Bug 51171: Improved performance of SharedValueManager 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1127860 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2011-05-26 10:31:38 +00:00
parent 6cd7769206
commit 67d2e1f6b0
2 changed files with 30 additions and 69 deletions
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1
src/documentation/content/xdocs/status.xml
View File

@ -34,6 +34,7 @@
<changes>
<release version="3.8-beta3" date="2011-??-??">
<action dev="poi-developers" type="add">51171 - Improved performance of SharedValueManager </action>
<action dev="poi-developers" type="fix">51236 - XSSF set colour support for black/white to match getter</action>
<action dev="poi-developers" type="add">51196 - Initial support for Spreadsheet Chart API</action>
<action dev="poi-developers" type="add">Add support for OOXML Agile Encryption</action>

98
src/java/org/apache/poi/hssf/record/aggregates/SharedValueManager.java
View File

@ -18,8 +18,6 @@
package org.apache.poi.hssf.record.aggregates;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@ -74,7 +72,7 @@ public final class SharedValueManager {
public void add(FormulaRecordAggregate agg) {
if (_numberOfFormulas == 0) {
if (_firstCell.getRow() != agg.getRow() || _firstCell.getCol() != agg.getColumn()) {
throw new IllegalStateException("shared formula coding error");
throw new IllegalStateException("shared formula coding error: "+_firstCell.getCol()+'/'+_firstCell.getRow()+" != "+agg.getColumn()+'/'+agg.getRow());
}
}
if (_numberOfFormulas >= _frAggs.length) {
@ -100,16 +98,6 @@ public final class SharedValueManager {
sb.append("]");
return sb.toString();
}
/**
* Note - the 'first cell' of a shared formula group is not always the top-left cell
* of the enclosing range.
* @return <code>true</code> if the specified coordinates correspond to the 'first cell'
* of this shared formula group.
*/
public boolean isFirstCell(int row, int column) {
return _firstCell.getRow() == row && _firstCell.getCol() == column;
}
}
/**
@ -124,7 +112,7 @@ public final class SharedValueManager {
private final TableRecord[] _tableRecords;
private final Map<SharedFormulaRecord, SharedFormulaGroup> _groupsBySharedFormulaRecord;
/** cached for optimization purposes */
private SharedFormulaGroup[] _groups;
private Map<Integer,SharedFormulaGroup> _groupsCache;
private SharedValueManager(SharedFormulaRecord[] sharedFormulaRecords,
CellReference[] firstCells, ArrayRecord[] arrayRecords, TableRecord[] tableRecords) {
@ -169,56 +157,30 @@ public final class SharedValueManager {
* @return never <code>null</code>
*/
public SharedFormulaRecord linkSharedFormulaRecord(CellReference firstCell, FormulaRecordAggregate agg) {
SharedFormulaGroup result = findFormulaGroup(getGroups(), firstCell);
SharedFormulaGroup result = findFormulaGroupForCell(firstCell);
result.add(agg);
return result.getSFR();
}
private static SharedFormulaGroup findFormulaGroup(SharedFormulaGroup[] groups, CellReference firstCell) {
int row = firstCell.getRow();
int column = firstCell.getCol();
// Traverse the list of shared formulas and try to find the correct one for us
private SharedFormulaGroup findFormulaGroupForCell(final CellReference cellRef) {
if(null == _groupsCache) {
_groupsCache = new HashMap<Integer,SharedFormulaGroup>(_groupsBySharedFormulaRecord.size());
for(SharedFormulaGroup group: _groupsBySharedFormulaRecord.values()) {
_groupsCache.put(getKeyForCache(group._firstCell),group);
}
}
SharedFormulaGroup sfg = _groupsCache.get(getKeyForCache(cellRef));
if(null == sfg) {
// TODO - fix file "15228.xls" so it opens in Excel after rewriting with POI
throw new RuntimeException("Failed to find a matching shared formula record");
}
return sfg;
}
// perhaps this could be optimised to some kind of binary search
for (int i = 0; i < groups.length; i++) {
SharedFormulaGroup svg = groups[i];
if (svg.isFirstCell(row, column)) {
return svg;
}
}
// TODO - fix file "15228.xls" so it opens in Excel after rewriting with POI
throw new RuntimeException("Failed to find a matching shared formula record");
}
private SharedFormulaGroup[] getGroups() {
if (_groups == null) {
SharedFormulaGroup[] groups = new SharedFormulaGroup[_groupsBySharedFormulaRecord.size()];
_groupsBySharedFormulaRecord.values().toArray(groups);
Arrays.sort(groups, SVGComparator); // make search behaviour more deterministic
_groups = groups;
}
return _groups;
}
private static final Comparator<SharedFormulaGroup> SVGComparator = new Comparator<SharedFormulaGroup>() {
public int compare(SharedFormulaGroup a, SharedFormulaGroup b) {
CellRangeAddress8Bit rangeA = a.getSFR().getRange();
CellRangeAddress8Bit rangeB = b.getSFR().getRange();
int cmp;
cmp = rangeA.getFirstRow() - rangeB.getFirstRow();
if (cmp != 0) {
return cmp;
}
cmp = rangeA.getFirstColumn() - rangeB.getFirstColumn();
if (cmp != 0) {
return cmp;
}
return 0;
}
};
private Integer getKeyForCache(final CellReference cellRef) {
// The HSSF has a max of 2^16 rows and 2^8 cols
return new Integer((cellRef.getCol()+1)<<16 | cellRef.getRow());
}
/**
* Gets the {@link SharedValueRecordBase} record if it should be encoded immediately after the
@ -248,15 +210,13 @@ public final class SharedValueManager {
// not the first formula cell in the group
return null;
}
SharedFormulaGroup[] groups = getGroups();
for (int i = 0; i < groups.length; i++) {
// note - logic for finding correct shared formula group is slightly
// more complicated since the first cell
SharedFormulaGroup sfg = groups[i];
if (sfg.isFirstCell(row, column)) {
return sfg.getSFR();
}
}
if(!_groupsBySharedFormulaRecord.isEmpty()) {
SharedFormulaGroup sfg = findFormulaGroupForCell(firstCell);
if(null != sfg) {
return sfg.getSFR();
}
}
// Since arrays and tables cannot be sparse (all cells in range participate)
// The first cell will be the top left in the range. So we can match the
@ -284,7 +244,7 @@ public final class SharedValueManager {
if (svg == null) {
throw new IllegalStateException("Failed to find formulas for shared formula");
}
_groups = null; // be sure to reset cached value
_groupsCache = null; // be sure to reset cached value
svg.unlinkSharedFormulas();
}