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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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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,
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See the License for the specific language governing permissions and
limitations under the License.
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package org.apache.poi.ss.formula;
import org.apache.poi.ss.formula.eval.BlankEval;
import org.apache.poi.ss.formula.eval.BoolEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.FormulaCellCache.IEntryOperation;
import org.apache.poi.ss.formula.FormulaUsedBlankCellSet.BookSheetKey;
import org.apache.poi.ss.formula.PlainCellCache.Loc;
import org.apache.poi.ss.usermodel.Cell;
/**
* Performance optimisation for {@link org.apache.poi.ss.usermodel.FormulaEvaluator}.
* This class stores previously calculated values of already visited cells,
* to avoid unnecessary re-calculation when the same cells are referenced multiple times
*
* @author Josh Micich
*/
final class EvaluationCache {
private final PlainCellCache _plainCellCache;
private final FormulaCellCache _formulaCellCache;
/** only used for testing. null otherwise */
final IEvaluationListener _evaluationListener;
/* package */EvaluationCache(IEvaluationListener evaluationListener) {
_evaluationListener = evaluationListener;
_plainCellCache = new PlainCellCache();
_formulaCellCache = new FormulaCellCache();
}
public void notifyUpdateCell(int bookIndex, int sheetIndex, EvaluationCell cell) {
FormulaCellCacheEntry fcce = _formulaCellCache.get(cell);
int rowIndex = cell.getRowIndex();
int columnIndex = cell.getColumnIndex();
Loc loc = new Loc(bookIndex, sheetIndex, rowIndex, columnIndex);
PlainValueCellCacheEntry pcce = _plainCellCache.get(loc);
if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
if (fcce == null) {
fcce = new FormulaCellCacheEntry();
if (pcce == null) {
if (_evaluationListener != null) {
_evaluationListener.onChangeFromBlankValue(sheetIndex, rowIndex,
columnIndex, cell, fcce);
}
updateAnyBlankReferencingFormulas(bookIndex, sheetIndex, rowIndex,
columnIndex);
}
_formulaCellCache.put(cell, fcce);
} else {
fcce.recurseClearCachedFormulaResults(_evaluationListener);
fcce.clearFormulaEntry();
}
if (pcce == null) {
// was formula cell before - no change of type
} else {
// changing from plain cell to formula cell
pcce.recurseClearCachedFormulaResults(_evaluationListener);
_plainCellCache.remove(loc);
}
} else {
ValueEval value = WorkbookEvaluator.getValueFromNonFormulaCell(cell);
if (pcce == null) {
if (value != BlankEval.instance) {
// only cache non-blank values in the plain cell cache
// (dependencies on blank cells are managed by
// FormulaCellCacheEntry._usedBlankCellGroup)
pcce = new PlainValueCellCacheEntry(value);
if (fcce == null) {
if (_evaluationListener != null) {
_evaluationListener.onChangeFromBlankValue(sheetIndex, rowIndex, columnIndex, cell, pcce);
}
updateAnyBlankReferencingFormulas(bookIndex, sheetIndex,
rowIndex, columnIndex);
}
_plainCellCache.put(loc, pcce);
}
} else {
if (pcce.updateValue(value)) {
pcce.recurseClearCachedFormulaResults(_evaluationListener);
}
if (value == BlankEval.instance) {
_plainCellCache.remove(loc);
}
}
if (fcce == null) {
// was plain cell before - no change of type
} else {
// was formula cell before - now a plain value
_formulaCellCache.remove(cell);
fcce.setSensitiveInputCells(null);
fcce.recurseClearCachedFormulaResults(_evaluationListener);
}
}
}
private void updateAnyBlankReferencingFormulas(int bookIndex, int sheetIndex,
final int rowIndex, final int columnIndex) {
final BookSheetKey bsk = new BookSheetKey(bookIndex, sheetIndex);
_formulaCellCache.applyOperation(new IEntryOperation() {
public void processEntry(FormulaCellCacheEntry entry) {
entry.notifyUpdatedBlankCell(bsk, rowIndex, columnIndex, _evaluationListener);
}
});
}
public PlainValueCellCacheEntry getPlainValueEntry(int bookIndex, int sheetIndex,
int rowIndex, int columnIndex, ValueEval value) {
Loc loc = new Loc(bookIndex, sheetIndex, rowIndex, columnIndex);
PlainValueCellCacheEntry result = _plainCellCache.get(loc);
if (result == null) {
result = new PlainValueCellCacheEntry(value);
_plainCellCache.put(loc, result);
if (_evaluationListener != null) {
_evaluationListener.onReadPlainValue(sheetIndex, rowIndex, columnIndex, result);
}
} else {
// TODO - if we are confident that this sanity check is not required, we can remove 'value' from plain value cache entry
if (!areValuesEqual(result.getValue(), value)) {
throw new IllegalStateException("value changed");
}
if (_evaluationListener != null) {
_evaluationListener.onCacheHit(sheetIndex, rowIndex, columnIndex, value);
}
}
return result;
}
private boolean areValuesEqual(ValueEval a, ValueEval b) {
if (a == null) {
return false;
}
Class cls = a.getClass();
if (cls != b.getClass()) {
// value type is changing
return false;
}
if (a == BlankEval.instance) {
return b == a;
}
if (cls == NumberEval.class) {
return ((NumberEval)a).getNumberValue() == ((NumberEval)b).getNumberValue();
}
if (cls == StringEval.class) {
return ((StringEval)a).getStringValue().equals(((StringEval)b).getStringValue());
}
if (cls == BoolEval.class) {
return ((BoolEval)a).getBooleanValue() == ((BoolEval)b).getBooleanValue();
}
if (cls == ErrorEval.class) {
return ((ErrorEval)a).getErrorCode() == ((ErrorEval)b).getErrorCode();
}
throw new IllegalStateException("Unexpected value class (" + cls.getName() + ")");
}
public FormulaCellCacheEntry getOrCreateFormulaCellEntry(EvaluationCell cell) {
FormulaCellCacheEntry result = _formulaCellCache.get(cell);
if (result == null) {
result = new FormulaCellCacheEntry();
_formulaCellCache.put(cell, result);
}
return result;
}
/**
* Should be called whenever there are changes to input cells in the evaluated workbook.
*/
public void clear() {
if(_evaluationListener != null) {
_evaluationListener.onClearWholeCache();
}
_plainCellCache.clear();
_formulaCellCache.clear();
}
public void notifyDeleteCell(int bookIndex, int sheetIndex, EvaluationCell cell) {
if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
FormulaCellCacheEntry fcce = _formulaCellCache.remove(cell);
if (fcce == null) {
// formula cell has not been evaluated yet
} else {
fcce.setSensitiveInputCells(null);
fcce.recurseClearCachedFormulaResults(_evaluationListener);
}
} else {
Loc loc = new Loc(bookIndex, sheetIndex, cell.getRowIndex(), cell.getColumnIndex());
PlainValueCellCacheEntry pcce = _plainCellCache.get(loc);
if (pcce == null) {
// cache entry doesn't exist. nothing to do
} else {
pcce.recurseClearCachedFormulaResults(_evaluationListener);
}
}
}
}