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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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package org.apache.poi.ss.formula.eval;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import org.apache.poi.ss.ITestDataProvider;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.junit.Test;
import junit.framework.AssertionFailedError;
/**
* Common superclass for testing cases of circular references
* both for HSSF and XSSF
*/
public abstract class BaseTestCircularReferences {
protected final ITestDataProvider _testDataProvider;
/**
* @param testDataProvider an object that provides test data in HSSF / XSSF specific way
*/
protected BaseTestCircularReferences(ITestDataProvider testDataProvider) {
_testDataProvider = testDataProvider;
}
/**
* Translates StackOverflowError into AssertionFailedError
*/
private CellValue evaluateWithCycles(Workbook wb, Cell testCell)
throws AssertionFailedError {
FormulaEvaluator evaluator = _testDataProvider.createFormulaEvaluator(wb);
try {
return evaluator.evaluate(testCell);
} catch (StackOverflowError e) {
throw new AssertionFailedError( "circular reference caused stack overflow error");
}
}
/**
* Makes sure that the specified evaluated cell value represents a circular reference error.
*/
private static void confirmCycleErrorCode(CellValue cellValue) {
assertTrue(cellValue.getCellTypeEnum() == CellType.ERROR);
assertEquals(ErrorEval.CIRCULAR_REF_ERROR.getErrorCode(), cellValue.getErrorValue());
}
/**
* ASF Bugzilla Bug 44413
* "INDEX() formula cannot contain its own location in the data array range"
*/
@Test
public void testIndexFormula() throws IOException {
Workbook wb = _testDataProvider.createWorkbook();
Sheet sheet = wb.createSheet("Sheet1");
int colB = 1;
sheet.createRow(0).createCell(colB).setCellValue(1);
sheet.createRow(1).createCell(colB).setCellValue(2);
sheet.createRow(2).createCell(colB).setCellValue(3);
Row row4 = sheet.createRow(3);
Cell testCell = row4.createCell(0);
// This formula should evaluate to the contents of B2,
testCell.setCellFormula("INDEX(A1:B4,2,2)");
// However the range A1:B4 also includes the current cell A4. If the other parameters
// were 4 and 1, this would represent a circular reference. Prior to v3.2 POI would
// 'fully' evaluate ref arguments before invoking operators, which raised the possibility of
// cycles / StackOverflowErrors.
CellValue cellValue = evaluateWithCycles(wb, testCell);
assertTrue(cellValue.getCellTypeEnum() == CellType.NUMERIC);
assertEquals(2, cellValue.getNumberValue(), 0);
wb.close();
}
/**
* Cell A1 has formula "=A1"
*/
@Test
public void testSimpleCircularReference() throws IOException {
Workbook wb = _testDataProvider.createWorkbook();
Sheet sheet = wb.createSheet("Sheet1");
Row row = sheet.createRow(0);
Cell testCell = row.createCell(0);
testCell.setCellFormula("A1");
CellValue cellValue = evaluateWithCycles(wb, testCell);
confirmCycleErrorCode(cellValue);
wb.close();
}
/**
* A1=B1, B1=C1, C1=D1, D1=A1
*/
@Test
public void testMultiLevelCircularReference() throws IOException {
Workbook wb = _testDataProvider.createWorkbook();
Sheet sheet = wb.createSheet("Sheet1");
Row row = sheet.createRow(0);
row.createCell(0).setCellFormula("B1");
row.createCell(1).setCellFormula("C1");
row.createCell(2).setCellFormula("D1");
Cell testCell = row.createCell(3);
testCell.setCellFormula("A1");
CellValue cellValue = evaluateWithCycles(wb, testCell);
confirmCycleErrorCode(cellValue);
wb.close();
}
@Test
public void testIntermediateCircularReferenceResults_bug46898() throws IOException {
Workbook wb = _testDataProvider.createWorkbook();
Sheet sheet = wb.createSheet("Sheet1");
Row row = sheet.createRow(0);
Cell cellA1 = row.createCell(0);
Cell cellB1 = row.createCell(1);
Cell cellC1 = row.createCell(2);
Cell cellD1 = row.createCell(3);
Cell cellE1 = row.createCell(4);
cellA1.setCellFormula("IF(FALSE, 1+B1, 42)");
cellB1.setCellFormula("1+C1");
cellC1.setCellFormula("1+D1");
cellD1.setCellFormula("1+E1");
cellE1.setCellFormula("1+A1");
FormulaEvaluator fe = _testDataProvider.createFormulaEvaluator(wb);
CellValue cv;
// Happy day flow - evaluate A1 first
cv = fe.evaluate(cellA1);
assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
assertEquals(42.0, cv.getNumberValue(), 0.0);
cv = fe.evaluate(cellB1); // no circ-ref-error because A1 result is cached
assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
assertEquals(46.0, cv.getNumberValue(), 0.0);
// Show the bug - evaluate another cell from the loop first
fe.clearAllCachedResultValues();
cv = fe.evaluate(cellB1);
// Identified bug 46898
assertNotEquals(cv.getCellTypeEnum(), ErrorEval.CIRCULAR_REF_ERROR.getErrorCode());
assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
assertEquals(46.0, cv.getNumberValue(), 0.0);
// start evaluation on another cell
fe.clearAllCachedResultValues();
cv = fe.evaluate(cellE1);
assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
assertEquals(43.0, cv.getNumberValue(), 0.0);
wb.close();
}
}