[XERCESJ-627] XMLGrammarPool operation - ASF JIRA

Details

Type: Bug
Status: Resolved
Resolution: Cannot Reproduce
Affects Version/s: 2.0.2
Fix Version/s: None
Component/s: XNI
Labels:
None
Environment:
Operating System: Windows NT/2K
Platform: PC

Bugzilla Id:
17314

Description

I'm attempting to write an implementation of XMLGrammarPool, code attached. The
implementation uses the XSDDescription.getLocationHints[0] as a key to the
pool.

Under some conditions, the retrieveGrammar method is passed an XSDDescription
with locationHints an array of length zero. In these cases, there seems to be
little else of use in the XSDDEscription. See Stack Trace 1.

If I code around the absent locationHint so that retrieveGrammar returns null,
then I get an ArrayIndexOutOfBoundsException in XMLSchemaValidator. See Stack
Trace 2.

I've also included the instance document that I'm attempting to parse and
relevant schemas. Note that this document parses if there is no grammarPool
registered to the parser.

- - - - Stack Trace 1 ****************
        java.lang.ArrayIndexOutOfBoundsException: 0
        at au.com.mqis.xmltools.ToolsGrammarPool.getKey
        (ToolsGrammarPool.java:112)
        at au.com.mqis.xmltools.ToolsGrammarPool.retrieveGrammar
        (ToolsGrammarPool.java:73)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.getSchemaGrammarFromAppl
        (XMLSchemaValidator.java:2220)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar
        (XMLSchemaValidator.java:2175)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement
        (XMLSchemaValidator.java:1724)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.emptyElement
        (XMLSchemaValidator.java:588)
        at org.apache.xerces.impl.XMLNamespaceBinder.handleStartElement
        (XMLNamespaceBinder.java:829)
        at org.apache.xerces.impl.XMLNamespaceBinder.emptyElement
        (XMLNamespaceBinder.java:590)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.emptyElement
        (XMLDTDValidator.java:817)
        at
        org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement
        (XMLDocumentFragmentScannerImpl.java:748)
        at
        org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.
        dispatch(XMLDocumentFragmentScannerImpl.java:1454)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument
        (XMLDocumentFragmentScannerImpl.java:333)
        at org.apache.xerces.parsers.StandardParserConfiguration.parse
        (StandardParserConfiguration.java:529)
        at org.apache.xerces.parsers.StandardParserConfiguration.parse
        (StandardParserConfiguration.java:585)
        at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:147)
        at org.apache.xerces.parsers.DOMParser.parse(DOMParser.java:221)
        .

- - - - Stack Trace 2 *********************
        java.lang.ArrayIndexOutOfBoundsException: 0
        at
        org.apache.xerces.impl.xs.XMLSchemaValidator$LocationArray.getFirstLocation
        (XMLSchemaValidator.java:2121)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.parseSchema
        (XMLSchemaValidator.java:2245)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.findSchemaGrammar
        (XMLSchemaValidator.java:2178)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement
        (XMLSchemaValidator.java:1724)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.emptyElement
        (XMLSchemaValidator.java:588)
        at org.apache.xerces.impl.XMLNamespaceBinder.handleStartElement
        (XMLNamespaceBinder.java:829)
        at org.apache.xerces.impl.XMLNamespaceBinder.emptyElement
        (XMLNamespaceBinder.java:590)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.emptyElement
        (XMLDTDValidator.java:817)
        at
        org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement
        (XMLDocumentFragmentScannerImpl.java:748)
        at
        org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.
        dispatch(XMLDocumentFragmentScannerImpl.java:1454)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument
        (XMLDocumentFragmentScannerImpl.java:333)
        at org.apache.xerces.parsers.StandardParserConfiguration.parse
        (StandardParserConfiguration.java:529)
        at org.apache.xerces.parsers.StandardParserConfiguration.parse
        (StandardParserConfiguration.java:585)
        at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:147)
        at org.apache.xerces.parsers.DOMParser.parse(DOMParser.java:221)

- - - - ToolGrammarPool.java **************************

package au.com.mqis.xmltools;

import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;

import org.apache.xerces.impl.xs.XSDDescription;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.grammars.Grammar;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.grammars.XMLGrammarPool;
/**

The implementation works for schemas only.
This implementation operates on drip feed.
It relies on the parser to return pre-parsed grammers via
the cacheGrammars method.
*/

public class ToolsGrammarPool implements XMLGrammarPool {
//
private boolean locked;
private Hashtable grammarCache;
//
/**

Constructor for ToolsGrammarPool
*/
public ToolsGrammarPool(XMLCatalog catalog) { super(); clear(); }

/**

@see XMLGrammarPool#retrieveInitialGrammarSet(String)
*/
public Grammar[] retrieveInitialGrammarSet(String grammarType)
Unknown macro: { // Grammar[] grammarArray = new Grammar[grammarCache.size()]; Set grammarSet = grammarCache.keySet(); String grammarKey; Iterator iter = grammarSet.iterator(); for (int i = 0; iter.hasNext(); i++) { grammarKey = (String) (iter.next()); grammarArray[i] = (Grammar) grammarCache.get (grammarKey); } System.out.println("retrieveInitialGrammarSet}

/**

@see XMLGrammarPool#cacheGrammars(String, Grammar[])
*/
public void cacheGrammars(String grammarType, Grammar[] grammarArray)
Unknown macro: { // if (locked) { return; } String grammarKey; String longKey; for (int i = 0; i < grammarArray.length; i++) { grammarKey = getKey((XSDDescription) grammarArray [i].getGrammarDescription()); System.out.println("cacheGrammars:" + grammarKey); grammarCache.put(grammarKey, grammarArray[i]); System.out.println("cacheGrammars:" + grammarKey + " added to cache:" + grammarCache.size()); } }

/**

@see XMLGrammarPool#retrieveGrammar(XMLGrammarDescription)
*/
public Grammar retrieveGrammar(XMLGrammarDescription
grammarDescription)
Unknown macro: { // String grammarKey = getKey((XSDDescription) grammarDescription); if ( grammarKey == null ) { return null; } Grammar grammar = (Grammar) (grammarCache.get(grammarKey)); if (grammar != null) { System.out.println("retrieveGrammar:" + grammarKey + " from cache"); } else { System.out.println("retrieveGrammar:" + grammarKey + " not found in cache:" + grammarCache.size()); } return grammar; }

/**

@see XMLGrammarPool#lockPool()
*/
public void lockPool() { locked = true; }

/**

@see XMLGrammarPool#unlockPool()
*/
public void unlockPool() { locked = false; }

/**

@see XMLGrammarPool#clear()
*/
public void clear() { grammarCache = new Hashtable(); locked = false; }
//
private String getKey(XSDDescription description)
{ // // This is the same technique used in the XMLCatalog entity resolver String[] hints = description.getLocationHints(); String longKey = hints[0]; int start = longKey.replace('\\', '/').lastIndexOf("/") + 1; String hint = longKey.substring(start); return hint; }
}

- - - - Instance Document ************************
        <?xml version="1.0"?>
        <mrr:SydneyWaterMessage
        xmlns:mrr="http://www.sydneywater.com.au/EKAMS/Internal/MeasurementRepor
        tRequest"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.sydneywater.com.au/EKAMS/Internal/Measure
        mentReportRequest EKAMSMeasurementReportRequest.xsd">
        <SydneyWaterHeader>
        <WorkFlowID></WorkFlowID>
        <SourceApplication>EKAMS</SourceApplication>
        <SourceFunction>FindTransmissionPage.SubmitMessage</SourceFunction>
        <SourceDateTime>2002-03-14T11:43:56</SourceDateTime>
        <UserID>t99</UserID>
        <TraceLevel>0</TraceLevel>
        <PerformanceStamp>
        <PerformanceComponent>A</PerformanceComponent>
        <PerformanceEvent>entry</PerformanceEvent>
        <PerformanceDateTime>2002-03-14T11:43:57.283</PerformanceDateTime>
        </PerformanceStamp>
        <PerformanceStamp>
        <PerformanceComponent>A</PerformanceComponent>
        <PerformanceEvent>exit</PerformanceEvent>
        <PerformanceDateTime>2002-03-14T11:43:58</PerformanceDateTime>
        </PerformanceStamp>
        </SydneyWaterHeader>
        <EKAMSIN>
        <MeasurementReportRequest>
        <ProgrammeCode>EPAL</ProgrammeCode>
        <ProgrammeCode>BEAC</ProgrammeCode>
        <STPCode>BE</STPCode>
        <STPCode>BH</STPCode>
        <STPCode>BN</STPCode>
        <AnalyteCode>AMM</AnalyteCode>
        <AnalyteCode>LI</AnalyteCode>
        <AnalyteCode>TKN</AnalyteCode>
        <AnalyteCode>CBOD</AnalyteCode>
        <IncludeGeometricMean>true</IncludeGeometricMean>
        <SamplingDateFirst>2002-06-01</SamplingDateFirst>
        <SamplingDateLast>2002-06-30</SamplingDateLast>
        </MeasurementReportRequest>
        </EKAMSIN>
        </mrr:SydneyWaterMessage>

- - - - Schema EKAMSMeasurementReportRequest.xsd ******************
        <?xml version="1.0" encoding="UTF-8"?>
        <schema xmlns="http://www.w3.org/2001/XMLSchema"
        version="1"
        xmlns:swc="http://www.sydneywater.com.au"
        xmlns:ekamsin="http://www.sydneywater.com.au/EKAMS/Internal"
        xmlns:this="http://www.sydneywater.com.au/EKAMS/Internal/MeasurementRepo
        rtRequest"
        targetNamespace="http://www.sydneywater.com.au/EKAMS/Internal/Measuremen
        tReportRequest">

<!-~~include schemaLocation="EKAMSInternal.xsd"/~~->
<import namespace="http://www.sydneywater.com.au"
schemaLocation="SydneyWaterHeader.xsd"/>
<import namespace="http://www.sydneywater.com.au/EKAMS/Internal"
schemaLocation="EKAMSInternal.xsd"/>

</schema>

- - - - Schema SydneyWaterHeader.xsd *******************
        <?xml version="1.0" encoding="UTF-8"?>
        <schema xmlns="http://www.w3.org/2001/XMLSchema" version="1"
        xmlns:swc="http://www.sydneywater.com.au"
        targetNamespace="http://www.sydneywater.com.au">

</schema>

- - - - Schema EKAMSInternal.xsd *****************
        <?xml version="1.0" encoding="UTF-8"?>
        <schema xmlns="http://www.w3.org/2001/XMLSchema" version="1"
        xmlns:ekamsin="http://www.sydneywater.com.au/EKAMS/Internal"
        targetNamespace="http://www.sydneywater.com.au/EKAMS/Internal"
        xmlns:ekamscom="http://www.sydneywater.com.au/EKAMS/Common">

- - - - Schema EKAMSCommon.xsd **********************
        <?xml version="1.0" encoding="UTF-8"?>
        <schema xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:ekamscom="http://www.sydneywater.com.au/EKAMS/Common"
        elementFormDefault="unqualified" attributeFormDefault="unqualified" version="1"
        targetNamespace="http://www.sydneywater.com.au/EKAMS/Common" >

</schema>

- - - - End of Description *************************

XMLGrammarPool operation

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