Hi,
Perhaps this issue has been discussed on the list but the archives aren't
available, so I have to post. Here goes...
I am trying to use what is called 'active' schema caching, as demonstrated
by the XMLGrammarBuilder example, except, I want to use DOMParser and use
the DOM of the XML instances that are successfully validated. This the code
I'm using
SymbolTable symtab = new SymbolTable();
XMLGrammarPreparser preparser = new XMLGrammarPreparser(symtab);
XMLGrammarPoolImpl pool = new XMLGrammarPoolImpl();
preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null);
preparser.setProperty(GRAMMAR_POOL, pool);
preparser.setFeature(NAMESPACES_FEATURE_ID, true);
preparser.setFeature(VALIDATION_FEATURE_ID, true);
preparser.setFeature(SCHEMA_VALIDATION_FEATURE_ID, true);
preparser.setFeature(SCHEMA_FULL_CHECKING_FEATURE_ID, true);
preparser.setErrorHandler(this);
System.out.println("Pre-compiling Schema from file " + xsd);
Grammar g = preparser.preparseGrammar(XMLGrammarDescription.XML_SCHEMA,
new
XMLInputSource(null, xsd, null));
pool.lockPool();
XMLParserConfiguration parsercfg = new
StandardParserConfiguration(symtab,
pool);
parsercfg.setFeature(NAMESPACES_FEATURE_ID, true);
parsercfg.setFeature(VALIDATION_FEATURE_ID, true);
parsercfg.setFeature(SCHEMA_VALIDATION_FEATURE_ID, true);
parsercfg.setFeature(SCHEMA_FULL_CHECKING_FEATURE_ID, true);
parsercfg.setEntityResolver(new XMLEntityResolver() {
public XMLInputSource
resolveEntity(XMLResourceIdentifier id) throws XNIException {
System.out.println("Resolving
resource: " +
id.getLiteralSystemId());
throw new XNIException("Not resolving entity...");
//return null;
}
});
First question is about the XMLEntityResolver. The FAQ instructs to register
a "do-nothing" EntityResolver. What does it mean? If I simply return null
(do nothing?) the XML instance document that should fail validation quietly
validates. Does it mean I should throw exception, as I do? That seems to
work but is it "do-nothing"?
More importantly, since not only need to validate XML but also get DOMs of
the valid ones, I followed the FAQ again and registered the DOMParser:
parser = new DOMParser(parsercfg);
parsercfg.setDocumentHandler(parser);
....
// f is File
XMLInputSource xis = new XMLInputSource(null, f.getName(), null);
System.out.println("Parsing instance XML in file " + f.getName() + " "
+ xis.getSystemId());
parsercfg.parse(xis);
But doe not work at all! I get a NullPointerException and the
XMLEntityResolver isn't called at all:
Pre-compiling Schema from file 2.xsd
Parsing instance XML in file 2.xml 2.xml
java.lang.NullPointerException
at org.apache.xerces.parsers.AbstractDOMParser.startDocument(Unknown
Source)
at org.apache.xerces.impl.xs.XMLSchemaValidator.startDocument(Unknown
Source)
at org.apache.xerces.impl.XMLNamespaceBinder.startDocument(Unknown
Source) at
org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown
Source) at
org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown
Source)
at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
at org.apache.xerces.impl.XMLEntityManager.startDocumentEntity(Unknown
Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl.setInputSource(Unknown
Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
[java] at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown
Source)
at gov.treas.fms.sps.utils.SchemaVerifier.parse(SchemaVerifier.java:189)
at gov.treas.fms.sps.utils.SchemaVerifier.parse(SchemaVerifier.java:199)
] at
gov.treas.fms.sps.utils.SchemaVerifier.parse(SchemaVerifier.java:207) at
gov.treas.fms.sps.utils.SchemaVerifier.main(SchemaVerifier.java:337)
I tried to test the entity resolver of the DOMParser but it isn't called
either: parser.setEntityResolver(new EntityResolver() {
public InputSource resolveEntity(String
pubid,
String sysid) throws SAXException, IOException {
System.out.println("DOM parser entity
resolver: pub id " +
pubid + ", sysid: " + sysid);
return null;
}
});
So, can somebody explain me what am I doing something wrong? And what should
I be doing to get what I want. Almost forgot, I'm using Xerces 2.2.1 and
changing parser with my client is very-very-very difficult - government
agency.
Please. lend a helping hand. TIA,
Regards,
-a
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