org.apache.poi.ss.formula.EvaluationTracker Maven / Gradle / Ivy
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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,
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.ss.formula;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.poi.ss.formula.eval.BlankEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.ValueEval;
/**
* Instances of this class keep track of multiple dependent cell evaluations due
* to recursive calls to {@link WorkbookEvaluator#evaluate(EvaluationCell)}}
* The main purpose of this class is to detect an attempt to evaluate a cell
* that is already being evaluated. In other words, it detects circular
* references in spreadsheet formulas.
*/
final class EvaluationTracker {
// TODO - consider deleting this class and letting CellEvaluationFrame take care of itself
private final List _evaluationFrames;
private final Set _currentlyEvaluatingCells;
private final EvaluationCache _cache;
public EvaluationTracker(EvaluationCache cache) {
_cache = cache;
_evaluationFrames = new ArrayList<>();
_currentlyEvaluatingCells = new HashSet<>();
}
/**
* Notifies this evaluation tracker that evaluation of the specified cell is
* about to start.
*
* In the case of a {@code true} return code, the caller should
* continue evaluation of the specified cell, and also be sure to call
* {@code endEvaluate()} when complete.
*
* In the case of a {@code null} return code, the caller should
* return an evaluation result of
* {@code ErrorEval.CIRCULAR_REF_ERROR}, and not call {@code endEvaluate()}.
*
* @return {@code false} if the specified cell is already being evaluated
*/
public boolean startEvaluate(FormulaCellCacheEntry cce) {
if (cce == null) {
throw new IllegalArgumentException("cellLoc must not be null");
}
if (_currentlyEvaluatingCells.contains(cce)) {
return false;
}
_currentlyEvaluatingCells.add(cce);
_evaluationFrames.add(new CellEvaluationFrame(cce));
return true;
}
public void updateCacheResult(ValueEval result) {
int nFrames = _evaluationFrames.size();
if (nFrames < 1) {
throw new IllegalStateException("Call to endEvaluate without matching call to startEvaluate");
}
CellEvaluationFrame frame = _evaluationFrames.get(nFrames-1);
if (result == ErrorEval.CIRCULAR_REF_ERROR && nFrames > 1) {
// Don't cache a circular ref error result if this cell is not the top evaluated cell.
// A true circular ref error will propagate all the way around the loop. However, it's
// possible to have parts of the formula tree (/ parts of the loop) to evaluate to
// CIRCULAR_REF_ERROR, and that value not get used in the final cell result (see the
// unit tests for a simple example). Thus, the only CIRCULAR_REF_ERROR result that can
// safely be cached is that of the top evaluated cell.
return;
}
frame.updateFormulaResult(result);
}
/**
* Notifies this evaluation tracker that the evaluation of the specified cell is complete.
*
* Every successful call to {@code startEvaluate} must be followed by a call to {@code endEvaluate} (recommended in a finally block) to enable
* proper tracking of which cells are being evaluated at any point in time.
*
* Assuming a well behaved client, parameters to this method would not be
* required. However, they have been included to assert correct behaviour,
* and form more meaningful error messages.
*/
public void endEvaluate(CellCacheEntry cce) {
int nFrames = _evaluationFrames.size();
if (nFrames < 1) {
throw new IllegalStateException("Call to endEvaluate without matching call to startEvaluate");
}
nFrames--;
CellEvaluationFrame frame = _evaluationFrames.get(nFrames);
if (cce != frame.getCCE()) {
throw new IllegalStateException("Wrong cell specified. ");
}
// else - no problems so pop current frame
_evaluationFrames.remove(nFrames);
_currentlyEvaluatingCells.remove(cce);
}
public void acceptFormulaDependency(CellCacheEntry cce) {
// Tell the currently evaluating cell frame that it has a dependency on the specified
int prevFrameIndex = _evaluationFrames.size()-1;
if (prevFrameIndex < 0) {
// Top level frame, there is no 'cell' above this frame that is using the current cell
} else {
CellEvaluationFrame consumingFrame = _evaluationFrames.get(prevFrameIndex);
consumingFrame.addSensitiveInputCell(cce);
}
}
public void acceptPlainValueDependency(EvaluationWorkbook evalWorkbook, int bookIndex, int sheetIndex,
int rowIndex, int columnIndex, ValueEval value) {
// Tell the currently evaluating cell frame that it has a dependency on the specified
int prevFrameIndex = _evaluationFrames.size() - 1;
if (prevFrameIndex < 0) {
// Top level frame, there is no 'cell' above this frame that is using the current cell
} else {
CellEvaluationFrame consumingFrame = _evaluationFrames.get(prevFrameIndex);
if (value == BlankEval.instance) {
consumingFrame.addUsedBlankCell(evalWorkbook, bookIndex, sheetIndex, rowIndex, columnIndex);
} else {
PlainValueCellCacheEntry cce = _cache.getPlainValueEntry(bookIndex, sheetIndex,
rowIndex, columnIndex, value);
consumingFrame.addSensitiveInputCell(cce);
}
}
}
}