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bug 59212: Do not check for overlapping regions when adding merged regions to a sheet

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1736165 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Javen O'Neal 2016-03-22 09:22:03 +00:00
parent e2615ce68e
commit 1128818a70
1 changed files with 49 additions and 0 deletions
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49
src/testcases/org/apache/poi/ss/usermodel/BaseTestSheet.java
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@ -24,6 +24,7 @@ import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.junit.Assume.assumeTrue;
import java.io.IOException;
import java.util.Iterator;
@ -442,6 +443,54 @@ public abstract class BaseTestSheet {
wb.close();
}
/**
* bug 58885: checking for overlapping merged regions when
* adding a merged region is safe, but runs in O(n).
* the check for merged regions when adding a merged region
* can be skipped (unsafe) and run in O(1).
*/
@Test
public void addMergedRegionUnsafe() throws IOException {
Workbook wb = _testDataProvider.createWorkbook();
Sheet sh = wb.createSheet();
CellRangeAddress region1 = CellRangeAddress.valueOf("A1:B2");
CellRangeAddress region2 = CellRangeAddress.valueOf("B2:C3");
CellRangeAddress region3 = CellRangeAddress.valueOf("C3:D4");
CellRangeAddress region4 = CellRangeAddress.valueOf("J10:K11");
assumeTrue(region1.intersects(region2));
assumeTrue(region2.intersects(region3));
sh.addMergedRegionUnsafe(region1);
assertTrue(sh.getMergedRegions().contains(region1));
// adding a duplicate or overlapping merged region should not
// raise an exception with the unsafe version of addMergedRegion.
sh.addMergedRegionUnsafe(region2);
// the safe version of addMergedRegion should throw when trying to add a merged region that overlaps an existing region
assertTrue(sh.getMergedRegions().contains(region2));
try {
sh.addMergedRegion(region3);
fail("Expected IllegalStateException. region3 overlaps already added merged region2.");
} catch (final IllegalStateException e) {
// expected
assertFalse(sh.getMergedRegions().contains(region3));
}
// addMergedRegion should not re-validate previously-added merged regions
sh.addMergedRegion(region4);
// validation methods should detect a problem with previously added merged regions (runs in O(n^2) time)
try {
sh.validateMergedRegions();
fail("Expected validation to fail. Sheet contains merged regions A1:B2 and B2:C3, which overlap at B2.");
} catch (final IllegalStateException e) {
// expected
}
wb.close();
}
/**
* Tests the display of gridlines, formulas, and rowcolheadings.
*/