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Patch from Josh from bug #44449 - Handle SharedFormulas better, for where there are formulas for the same area on two sheets, and when the shared formula flag is set incorrectly 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@629837 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2008-02-21 15:48:52 +00:00
parent fdd81557df
commit b6b58b6d44
5 changed files with 161 additions and 9 deletions
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1
src/documentation/content/xdocs/changes.xml
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@ -36,6 +36,7 @@
<!-- Don't forget to update status.xml too! -->
<release version="3.1-beta1" date="2008-??-??">
<action dev="POI-DEVELOPERS" type="fix">44449 - Avoid getting confused when two sheets have shared formulas for the same areas, and when the shared formula is set incorrectly</action>
<action dev="POI-DEVELOPERS" type="fix">44366 - InputStreams passed to POIFSFileSystem are now automatically closed. A warning is generated for people who might've relied on them not being closed before, and a wrapper to restore the old behaviour is supplied</action>
<action dev="POI-DEVELOPERS" type="add">44371 - Support for the Offset function</action>
<action dev="POI-DEVELOPERS" type="fix">38921 - Have HSSFPalette.findSimilar() work properly</action>

1
src/documentation/content/xdocs/status.xml
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@ -33,6 +33,7 @@
<!-- Don't forget to update changes.xml too! -->
<changes>
<release version="3.1-beta1" date="2008-??-??">
<action dev="POI-DEVELOPERS" type="fix">44449 - Avoid getting confused when two sheets have shared formulas for the same areas, and when the shared formula is set incorrectly</action>
<action dev="POI-DEVELOPERS" type="fix">44366 - InputStreams passed to POIFSFileSystem are now automatically closed. A warning is generated for people who might've relied on them not being closed before, and a wrapper to restore the old behaviour is supplied</action>
<action dev="POI-DEVELOPERS" type="add">44371 - Support for the Offset function</action>
<action dev="POI-DEVELOPERS" type="fix">38921 - Have HSSFPalette.findSimilar() work properly</action>

34
src/java/org/apache/poi/hssf/record/aggregates/ValueRecordsAggregate.java
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@ -34,7 +34,7 @@ import java.util.List;
* @author Jason Height (jheight at chariot dot net dot au)
*/
public class ValueRecordsAggregate
public final class ValueRecordsAggregate
extends Record
{
public final static short sid = -1000;
@ -127,7 +127,7 @@ public class ValueRecordsAggregate
FormulaRecordAggregate lastFormulaAggregate = null;
// First up, locate all the shared formulas
// First up, locate all the shared formulas for this sheet
List sharedFormulas = new java.util.ArrayList();
for (k = offset; k < records.size(); k++)
{
@ -135,6 +135,10 @@ public class ValueRecordsAggregate
if (rec instanceof SharedFormulaRecord) {
sharedFormulas.add(rec);
}
if(rec instanceof EOFRecord) {
// End of current sheet. Ignore all subsequent shared formula records (Bugzilla 44449)
break;
}
}
// Now do the main processing sweep
@ -156,6 +160,8 @@ public class ValueRecordsAggregate
// for us
boolean found = false;
for (int i=sharedFormulas.size()-1;i>=0;i--) {
// TODO - there is no junit test case to justify this reversed loop
// perhaps it could just run in the normal direction?
SharedFormulaRecord shrd = (SharedFormulaRecord)sharedFormulas.get(i);
if (shrd.isFormulaInShared(formula)) {
shrd.convertSharedFormulaRecord(formula);
@ -164,9 +170,7 @@ public class ValueRecordsAggregate
}
}
if (!found) {
//Sometimes the shared formula flag "seems" to be errornously set,
//cant really do much about that.
//throw new RecordFormatException("Could not find appropriate shared formula");
handleMissingSharedFormulaRecord(formula);
}
}
@ -185,6 +189,24 @@ public class ValueRecordsAggregate
return k;
}
/**
* Sometimes the shared formula flag "seems" to be erroneously set, in which case there is no
* call to <tt>SharedFormulaRecord.convertSharedFormulaRecord</tt> and hence the
* <tt>parsedExpression</tt> field of this <tt>FormulaRecord</tt> will not get updated.<br/>
* As it turns out, this is not a problem, because in these circumstances, the existing value
* for <tt>parsedExpression</tt> is perfectly OK.<p/>
*
* This method may also be used for setting breakpoints to help diagnose issues regarding the
* abnormally-set 'shared formula' flags.
* (see TestValueRecordsAggregate.testSpuriousSharedFormulaFlag()).<p/>
*
* The method currently does nothing but do not delete it without finding a nice home for this
* comment.
*/
private static void handleMissingSharedFormulaRecord(FormulaRecord formula) {
// could log an info message here since this is a fairly unusual occurrence.
}
/**
* called by the class that is responsible for writing this sucker.
* Subclasses should implement this so that their data is passed back in a
@ -300,7 +322,7 @@ public class ValueRecordsAggregate
return rec;
}
public class MyIterator implements Iterator {
private final class MyIterator implements Iterator {
short nextColumn=-1;
int nextRow,lastRow;

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src/testcases/org/apache/poi/hssf/data/AbnormalSharedFormulaFlag.xls Executable file
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134
src/testcases/org/apache/poi/hssf/record/aggregates/TestValueRecordsAggregate.java
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@ -17,15 +17,30 @@
package org.apache.poi.hssf.record.aggregates;
import junit.framework.TestCase;
import org.apache.poi.hssf.record.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.zip.CRC32;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;
import org.apache.poi.hssf.record.BlankRecord;
import org.apache.poi.hssf.record.FormulaRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.SharedFormulaRecord;
import org.apache.poi.hssf.record.UnknownRecord;
import org.apache.poi.hssf.record.WindowOneRecord;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class TestValueRecordsAggregate extends TestCase
{
private static final String ABNORMAL_SHARED_FORMULA_FLAG_TEST_FILE = "AbnormalSharedFormulaFlag.xls";
ValueRecordsAggregate valueRecord = new ValueRecordsAggregate();
/**
@ -203,4 +218,117 @@ public class TestValueRecordsAggregate extends TestCase
assertEquals( 36, valueRecord.getRecordSize() );
}
/**
* Sometimes the 'shared formula' flag (<tt>FormulaRecord.isSharedFormula()</tt>) is set when
* there is no corresponding SharedFormulaRecord available. SharedFormulaRecord definitions do
* not span multiple sheets. They are are only defined within a sheet, and thus they do not
* have a sheet index field (only row and column range fields).<br/>
* So it is important that the code which locates the SharedFormulaRecord for each
* FormulaRecord does not allow matches across sheets.</br>
*
* Prior to bugzilla 44449 (Feb 2008), POI <tt>ValueRecordsAggregate.construct(int, List)</tt>
* allowed <tt>SharedFormulaRecord</tt>s to be erroneously used across sheets. That incorrect
* behaviour is shown by this test.<p/>
*
* <b>Notes on how to produce the test spreadsheet</b>:</p>
* The setup for this test (AbnormalSharedFormulaFlag.xls) is rather fragile, insomuchas
* re-saving the file (either with Excel or POI) clears the flag.<br/>
* <ol>
* <li>A new spreadsheet was created in Excel (File | New | Blank Workbook).</li>
* <li>Sheet3 was deleted.</li>
* <li>Sheet2!A1 formula was set to '="second formula"', and fill-dragged through A1:A8.</li>
* <li>Sheet1!A1 formula was set to '="first formula"', and also fill-dragged through A1:A8.</li>
* <li>Four rows on Sheet1 "5" through "8" were deleted ('delete rows' alt-E D, not 'clear' Del).</li>
* <li>The spreadsheet was saved as AbnormalSharedFormulaFlag.xls.</li>
* </ol>
* Prior to the row delete action the spreadsheet has two <tt>SharedFormulaRecord</tt>s. One
* for each sheet. To expose the bug, the shared formulas have been made to overlap.<br/>
* The row delete action (as described here) seems to to delete the
* <tt>SharedFormulaRecord</tt> from Sheet1 (but not clear the 'shared formula' flags.<br/>
* There are other variations on this theme to create the same effect.
*
*/
public void testSpuriousSharedFormulaFlag() {
File dataDir = new File(System.getProperty("HSSF.testdata.path"));
File testFile = new File(dataDir, ABNORMAL_SHARED_FORMULA_FLAG_TEST_FILE);
long actualCRC = getFileCRC(testFile);
long expectedCRC = 2277445406L;
if(actualCRC != expectedCRC) {
System.err.println("Expected crc " + expectedCRC + " but got " + actualCRC);
throw failUnexpectedTestFileChange();
}
HSSFWorkbook wb;
try {
FileInputStream in = new FileInputStream(testFile);
wb = new HSSFWorkbook(in);
} catch (IOException e) {
throw new RuntimeException(e);
}
HSSFSheet s = wb.getSheetAt(0); // Sheet1
String cellFormula;
cellFormula = getFormulaFromFirstCell(s, 0); // row "1"
// the problem is not observable in the first row of the shared formula
if(!cellFormula.equals("\"first formula\"")) {
throw new RuntimeException("Something else wrong with this test case");
}
// but the problem is observable in rows 2,3,4
cellFormula = getFormulaFromFirstCell(s, 1); // row "2"
if(cellFormula.equals("\"second formula\"")) {
throw new AssertionFailedError("found bug 44449 (Wrong SharedFormulaRecord was used).");
}
if(!cellFormula.equals("\"first formula\"")) {
throw new RuntimeException("Something else wrong with this test case");
}
}
private static String getFormulaFromFirstCell(HSSFSheet s, int rowIx) {
return s.getRow(rowIx).getCell((short)0).getCellFormula();
}
/**
* If someone opened this particular test file in Excel and saved it, the peculiar condition
* which causes the target bug would probably disappear. This test would then just succeed
* regardless of whether the fix was present. So a CRC check is performed to make it less easy
* for that to occur.
*/
private static RuntimeException failUnexpectedTestFileChange() {
String msg = "Test file '" + ABNORMAL_SHARED_FORMULA_FLAG_TEST_FILE + "' has changed. "
+ "This junit may not be properly testing for the target bug. "
+ "Either revert the test file or ensure that the new version "
+ "has the right characteristics to test the target bug.";
// A breakpoint in ValueRecordsAggregate.handleMissingSharedFormulaRecord(FormulaRecord)
// should get hit during parsing of Sheet1.
// If the test spreadsheet is created as directed, this condition should occur.
// It is easy to upset the test spreadsheet (for example re-saving will destroy the
// peculiar condition we are testing for).
throw new RuntimeException(msg);
}
/**
* gets a CRC checksum for the content of a file
*/
private static long getFileCRC(File f) {
CRC32 crc = new CRC32();
byte[] buf = new byte[2048];
try {
InputStream is = new FileInputStream(f);
while(true) {
int bytesRead = is.read(buf);
if(bytesRead < 1) {
break;
}
crc.update(buf, 0, bytesRead);
}
is.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
return crc.getValue();
}
}