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bug 58443: prevent corrupted workbooks by checking for overlapping merged regions before adding a merged region to a sheet; fix unit tests that produced corrupt workbooks; remove deprecated HSSFSheet#addMergedRegion(Region) 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1711586 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Javen O'Neal 2015-10-31 10:22:19 +00:00
parent c158ddea1c
commit 6456105e37
7 changed files with 160 additions and 20 deletions
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26
src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java
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@ -673,22 +673,13 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
_sheet.setGridsPrinted(value);
}
/**
* @deprecated (Aug-2008) use <tt>CellRangeAddress</tt> instead of <tt>Region</tt>
*/
public int addMergedRegion(org.apache.poi.ss.util.Region region) {
return _sheet.addMergedRegion(region.getRowFrom(),
region.getColumnFrom(),
//(short) region.getRowTo(),
region.getRowTo(),
region.getColumnTo());
}
/**
* adds a merged region of cells (hence those cells form one)
*
* @param region (rowfrom/colfrom-rowto/colto) to merge
* @return index of this region
* @throws IllegalStateException if region intersects with an existing merged region
* or multi-cell array formula on this sheet
*/
public int addMergedRegion(CellRangeAddress region) {
region.validate(SpreadsheetVersion.EXCEL97);
@ -697,6 +688,10 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
// a multi-cell array formula defined in this sheet
validateArrayFormulas(region);
// Throw IllegalStateException if the argument CellRangeAddress intersects with
// a merged region already in this sheet
validateMergedRegions(region);
return _sheet.addMergedRegion(region.getFirstRow(),
region.getFirstColumn(),
region.getLastRow(),
@ -731,6 +726,15 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
}
private void validateMergedRegions(CellRangeAddress candidateRegion) {
for (final CellRangeAddress existingRegion : getMergedRegions()) {
if (existingRegion.intersects(candidateRegion)) {
throw new IllegalStateException("Cannot add merged region " + candidateRegion.formatAsString() +
" to sheet because it overlaps with an existing merged region (" + existingRegion.formatAsString() + ").");
}
}
}
/**
* Control if Excel should be asked to recalculate all formulas on this sheet
* when the workbook is opened.

40
src/java/org/apache/poi/ss/util/CellRangeAddressBase.java
View File

@ -17,6 +17,8 @@
package org.apache.poi.ss.util;
import java.awt.Rectangle;
import org.apache.poi.ss.SpreadsheetVersion;
@ -124,6 +126,44 @@ public abstract class CellRangeAddressBase {
_firstCol <= colInd && colInd <= _lastCol;
}
/**
* Determines whether or not this CellRangeAddress and the specified CellRangeAddress intersect.
*
* @param other
* @return
*/
public boolean intersects(CellRangeAddressBase other) {
// see java.awt.Rectangle.intersects
// http://stackoverflow.com/questions/13390333/two-rectangles-intersection
// TODO: Replace with an intersection code that doesn't rely on java.awt
return getRectangle().intersects(other.getRectangle());
}
// TODO: Replace with an intersection code that doesn't rely on java.awt
// Don't let this temporary implementation detail leak outside of this class
private final Rectangle getRectangle() {
int firstRow, firstCol, lastRow, lastCol;
if (!isFullColumnRange()) {
firstRow = Math.min(_firstRow, _lastRow);
lastRow = Math.max(_firstRow, _lastRow);
}
else {
firstRow = 0;
lastRow = Integer.MAX_VALUE;
}
if (!isFullRowRange()) {
firstCol = Math.min(_firstCol, _lastCol);
lastCol = Math.max(_firstCol, _lastCol);
}
else {
firstCol = 0;
lastCol = Integer.MAX_VALUE;
}
return new Rectangle(firstRow, firstCol, lastRow-firstRow+1, lastCol-firstCol+1);
}
/**
* @param firstCol column number for the upper left hand corner
*/

26
src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFSheet.java
View File

@ -327,6 +327,8 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet {
*
* @param region (rowfrom/colfrom-rowto/colto) to merge
* @return index of this region
* @throws IllegalStateException if region intersects with a multi-cell array formula
* @throws IllegalStateException if region intersects with an existing region on this sheet
*/
@Override
public int addMergedRegion(CellRangeAddress region) {
@ -336,12 +338,22 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet {
// a multi-cell array formula defined in this sheet
validateArrayFormulas(region);
// Throw IllegalStateException if the argument CellRangeAddress intersects with
// a merged region already in this sheet
validateMergedRegions(region);
CTMergeCells ctMergeCells = worksheet.isSetMergeCells() ? worksheet.getMergeCells() : worksheet.addNewMergeCells();
CTMergeCell ctMergeCell = ctMergeCells.addNewMergeCell();
ctMergeCell.setRef(region.formatAsString());
return ctMergeCells.sizeOfMergeCellArray();
}
/**
* Verify that the candidate region does not intersect with an existing multi-cell array formula in this sheet
*
* @param region
* @throws IllegalStateException if candidate region intersects an existing array formula in this sheet
*/
private void validateArrayFormulas(CellRangeAddress region){
int firstRow = region.getFirstRow();
int firstColumn = region.getFirstColumn();
@ -369,6 +381,20 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet {
}
}
/**
* Verify that candidate region does not intersect with an existing merged region in this sheet
*
* @param candidateRegion
* @throws IllegalStateException if candidate region intersects an existing merged region in this sheet
*/
private void validateMergedRegions(CellRangeAddress candidateRegion) {
for (final CellRangeAddress existingRegion : getMergedRegions()) {
if (existingRegion.intersects(candidateRegion)) {
throw new IllegalStateException("Cannot add merged region " + candidateRegion.formatAsString() +
" to sheet because it overlaps with an existing merged region (" + existingRegion.formatAsString() + ").");
}
}
}
/**
* Adjusts the column width to fit the contents.

2
src/testcases/org/apache/poi/ss/usermodel/BaseTestBugzillaIssues.java
View File

@ -143,7 +143,7 @@ public abstract class BaseTestBugzillaIssues {
Sheet template = wb.getSheetAt(0);
template.addMergedRegion(new CellRangeAddress(0, 1, 0, 2));
template.addMergedRegion(new CellRangeAddress(1, 2, 0, 2));
template.addMergedRegion(new CellRangeAddress(2, 3, 0, 2));
Sheet clone = wb.cloneSheet(0);
int originalMerged = template.getNumMergedRegions();

44
src/testcases/org/apache/poi/ss/usermodel/BaseTestSheet.java
View File

@ -258,6 +258,46 @@ public abstract class BaseTestSheet {
wb2.close();
}
/**
* Dissallow creating wholly or partially overlapping merged regions
* as this results in a corrupted workbook
*/
@Test
public void addOverlappingMergedRegions() {
final Workbook wb = _testDataProvider.createWorkbook();
final Sheet sheet = wb.createSheet();
final CellRangeAddress baseRegion = new CellRangeAddress(0, 1, 0, 1);
sheet.addMergedRegion(baseRegion);
try {
final CellRangeAddress duplicateRegion = new CellRangeAddress(0, 1, 0, 1);
sheet.addMergedRegion(duplicateRegion);
fail("Should not be able to add a merged region if sheet already contains the same merged region");
} catch (final IllegalStateException e) { } //expected
try {
final CellRangeAddress partiallyOverlappingRegion = new CellRangeAddress(1, 2, 1, 2);
sheet.addMergedRegion(partiallyOverlappingRegion);
fail("Should not be able to add a merged region if it partially overlaps with an existing merged region");
} catch (final IllegalStateException e) { } //expected
try {
final CellRangeAddress subsetRegion = new CellRangeAddress(0, 1, 0, 0);
sheet.addMergedRegion(subsetRegion);
fail("Should not be able to add a merged region if it is a formal subset of an existing merged region");
} catch (final IllegalStateException e) { } //expected
try {
final CellRangeAddress supersetRegion = new CellRangeAddress(0, 2, 0, 2);
sheet.addMergedRegion(supersetRegion);
fail("Should not be able to add a merged region if it is a formal superset of an existing merged region");
} catch (final IllegalStateException e) { } //expected
final CellRangeAddress disjointRegion = new CellRangeAddress(10, 11, 10, 11);
sheet.addMergedRegion(disjointRegion); //allowed
}
/**
* Test adding merged regions. If the region's bounds are outside of the allowed range
* then an IllegalArgumentException should be thrown
@ -310,13 +350,13 @@ public abstract class BaseTestSheet {
Sheet sheet = wb.createSheet();
CellRangeAddress region = new CellRangeAddress(0, 1, 0, 1);
sheet.addMergedRegion(region);
region = new CellRangeAddress(1, 2, 0, 1);
region = new CellRangeAddress(2, 3, 0, 1);
sheet.addMergedRegion(region);
sheet.removeMergedRegion(0);
region = sheet.getMergedRegion(0);
assertEquals("Left over region should be starting at row 1", 1, region.getFirstRow());
assertEquals("Left over region should be starting at row 2", 2, region.getFirstRow());
sheet.removeMergedRegion(0);

12
src/testcases/org/apache/poi/ss/usermodel/BaseTestWorkbook.java
View File

@ -448,7 +448,7 @@ public abstract class BaseTestWorkbook {
sheet.createRow(0).createCell(0).setCellValue("Test");
sheet.createRow(1).createCell(0).setCellValue(36.6);
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 2));
sheet.addMergedRegion(new CellRangeAddress(1, 2, 0, 2));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 0, 2));
assertTrue(sheet.isSelected());
Sheet clonedSheet = book.cloneSheet(0);
@ -457,16 +457,16 @@ public abstract class BaseTestWorkbook {
assertEquals(2, clonedSheet.getNumMergedRegions());
assertFalse(clonedSheet.isSelected());
//cloned sheet is a deep copy, adding rows in the original does not affect the clone
//cloned sheet is a deep copy, adding rows or merged regions in the original does not affect the clone
sheet.createRow(2).createCell(0).setCellValue(1);
sheet.addMergedRegion(new CellRangeAddress(0, 2, 0, 2));
assertEquals(2, clonedSheet.getPhysicalNumberOfRows());
sheet.addMergedRegion(new CellRangeAddress(4, 5, 0, 2));
assertEquals(2, clonedSheet.getPhysicalNumberOfRows());
assertEquals(2, clonedSheet.getNumMergedRegions());
clonedSheet.createRow(2).createCell(0).setCellValue(1);
clonedSheet.addMergedRegion(new CellRangeAddress(0, 2, 0, 2));
assertEquals(3, clonedSheet.getPhysicalNumberOfRows());
clonedSheet.addMergedRegion(new CellRangeAddress(6, 7, 0, 2));
assertEquals(3, clonedSheet.getPhysicalNumberOfRows());
assertEquals(3, clonedSheet.getNumMergedRegions());
}

30
src/testcases/org/apache/poi/ss/util/TestCellRangeAddress.java
View File

@ -17,6 +17,8 @@ limitations under the License.
package org.apache.poi.ss.util;
import static org.junit.Assert.fail;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
@ -233,4 +235,32 @@ public final class TestCellRangeAddress extends TestCase {
assertEquals(4, ref.getMinColumn());
assertEquals(10, ref.getMaxColumn());
}
public void testIntersects() {
final CellRangeAddress baseRegion = new CellRangeAddress(0, 1, 0, 1);
final CellRangeAddress duplicateRegion = new CellRangeAddress(0, 1, 0, 1);
assertIntersects(baseRegion, duplicateRegion);
final CellRangeAddress partiallyOverlappingRegion = new CellRangeAddress(1, 2, 1, 2);
assertIntersects(baseRegion, partiallyOverlappingRegion);
final CellRangeAddress subsetRegion = new CellRangeAddress(0, 1, 0, 0);
assertIntersects(baseRegion, subsetRegion);
final CellRangeAddress supersetRegion = new CellRangeAddress(0, 2, 0, 2);
assertIntersects(baseRegion, supersetRegion);
final CellRangeAddress disjointRegion = new CellRangeAddress(10, 11, 10, 11);
assertNotIntersects(baseRegion, disjointRegion);
}
private static void assertIntersects(CellRangeAddress regionA, CellRangeAddress regionB) {
assertTrue(regionA.intersects(regionB));
assertTrue(regionB.intersects(regionA));
}
private static void assertNotIntersects(CellRangeAddress regionA, CellRangeAddress regionB) {
assertFalse(regionA.intersects(regionB));
assertFalse(regionB.intersects(regionA));
}
}