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Improved performance of RowRecordsAggregate.getStartRowNumberForBlock / getEndRowNumberForBlock, see Bugzilla 47405

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1043517 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2010-12-08 16:53:24 +00:00
parent 0f86c22ae8
commit b2ee6fb309
2 changed files with 28 additions and 23 deletions
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1
src/documentation/content/xdocs/status.xml
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@ -34,6 +34,7 @@
<changes>
<release version="3.8-beta1" date="2010-??-??">
<action dev="poi-developers" type="add">47405 - Improved performance of RowRecordsAggregate.getStartRowNumberForBlock / getEndRowNumberForBlock</action>
<action dev="poi-developers" type="add">50315 - Avoid crashing Excel when sorting XSSFSheet autofilter</action>
<action dev="poi-developers" type="add">50076 - Allow access from XSSFReader to sheet comments and headers/footers</action>
<action dev="poi-developers" type="add">50076 - Refactor XSSFEventBasedExcelExtractor to make it easier for you to have control over outputting the cell contents</action>

50
src/java/org/apache/poi/hssf/record/aggregates/RowRecordsAggregate.java
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@ -54,6 +54,10 @@ public final class RowRecordsAggregate extends RecordAggregate {
private final List<Record> _unknownRecords;
private final SharedValueManager _sharedValueManager;
// Cache values to speed up performance of
// getStartRowNumberForBlock / getEndRowNumberForBlock, see Bugzilla 47405
private RowRecord[] _rowRecordValues = null;
/** Creates a new instance of ValueRecordsAggregate */
public RowRecordsAggregate() {
this(SharedValueManager.createEmpty());
@ -121,6 +125,8 @@ public final class RowRecordsAggregate extends RecordAggregate {
public void insertRow(RowRecord row) {
// Integer integer = Integer.valueOf(row.getRowNumber());
_rowRecords.put(Integer.valueOf(row.getRowNumber()), row);
// Clear the cached values
_rowRecordValues = null;
if ((row.getRowNumber() < _firstrow) || (_firstrow == -1)) {
_firstrow = row.getRowNumber();
}
@ -141,6 +147,9 @@ public final class RowRecordsAggregate extends RecordAggregate {
_rowRecords.put(key, rr);
throw new RuntimeException("Attempt to remove row that does not belong to this sheet");
}
// Clear the cached values
_rowRecordValues = null;
}
public RowRecord getRow(int rowIndex) {
@ -193,22 +202,17 @@ public final class RowRecordsAggregate extends RecordAggregate {
/** Returns the physical row number of the first row in a block*/
private int getStartRowNumberForBlock(int block) {
//Given that we basically iterate through the rows in order,
// TODO - For a performance improvement, it would be better to return an instance of
//an iterator and use that instance throughout, rather than recreating one and
//having to move it to the right position.
int startIndex = block * DBCellRecord.BLOCK_SIZE;
Iterator<RowRecord> rowIter = _rowRecords.values().iterator();
RowRecord row = null;
//Position the iterator at the start of the block
for (int i=0; i<=startIndex;i++) {
row = rowIter.next();
}
if (row == null) {
throw new RuntimeException("Did not find start row for block " + block);
}
int startIndex = block * DBCellRecord.BLOCK_SIZE;
return row.getRowNumber();
if(_rowRecordValues == null){
_rowRecordValues = _rowRecords.values().toArray(new RowRecord[_rowRecords.size()]);
}
try {
return _rowRecordValues[startIndex].getRowNumber();
} catch(ArrayIndexOutOfBoundsException e) {
throw new RuntimeException("Did not find start row for block " + block);
}
}
/** Returns the physical row number of the end row in a block*/
@ -217,15 +221,15 @@ public final class RowRecordsAggregate extends RecordAggregate {
if (endIndex >= _rowRecords.size())
endIndex = _rowRecords.size()-1;
Iterator<RowRecord> rowIter = _rowRecords.values().iterator();
RowRecord row = null;
for (int i=0; i<=endIndex;i++) {
row = rowIter.next();
if(_rowRecordValues == null){
_rowRecordValues = _rowRecords.values().toArray(new RowRecord[_rowRecords.size()]);
}
try {
return _rowRecordValues[endIndex].getRowNumber();
} catch(ArrayIndexOutOfBoundsException e) {
throw new RuntimeException("Did not find end row for block " + block);
}
if (row == null) {
throw new RuntimeException("Did not find start row for block " + block);
}
return row.getRowNumber();
}
private int visitRowRecordsForBlock(int blockIndex, RecordVisitor rv) {