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package com.sun.org.apache.xerces.internal.util;
import java.io.InputStream;
import java.io.IOException;
import java.io.Reader;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* This class wraps a SAX entity resolver in an XNI entity resolver.
*
* @see EntityResolver
*
* @author Andy Clark, IBM
*
* @version $Id: EntityResolverWrapper.java,v 1.6 2010-11-01 04:40:14 joehw Exp $
*/
public class EntityResolverWrapper
implements XMLEntityResolver {
//
// Data
//
/** The SAX entity resolver. */
protected EntityResolver fEntityResolver;
//
// Constructors
//
/** Default constructor. */
public EntityResolverWrapper() {}
/** Wraps the specified SAX entity resolver. */
public EntityResolverWrapper(EntityResolver entityResolver) {
setEntityResolver(entityResolver);
} // (EntityResolver)
//
// Public methods
//
/** Sets the SAX entity resolver. */
public void setEntityResolver(EntityResolver entityResolver) {
fEntityResolver = entityResolver;
} // setEntityResolver(EntityResolver)
/** Returns the SAX entity resolver. */
public EntityResolver getEntityResolver() {
return fEntityResolver;
} // getEntityResolver():EntityResolver
//
// XMLEntityResolver methods
//
/**
* Resolves an external parsed entity. If the entity cannot be
* resolved, this method should return null.
*
* @param resourceIdentifier contains the physical co-ordinates of the resource to be resolved
*
* @throws XNIException Thrown on general error.
* @throws IOException Thrown if resolved entity stream cannot be
* opened or some other i/o error occurs.
*/
public XMLInputSource resolveEntity(XMLResourceIdentifier resourceIdentifier)
throws XNIException, IOException {
// When both pubId and sysId are null, the user's entity resolver
// can do nothing about it. We'd better not bother calling it.
// This happens when the resourceIdentifier is a GrammarDescription,
// which describes a schema grammar of some namespace, but without
// any schema location hint. -Sg
String pubId = resourceIdentifier.getPublicId();
String sysId = resourceIdentifier.getExpandedSystemId();
if (pubId == null && sysId == null)
return null;
// resolve entity using SAX entity resolver
if (fEntityResolver != null && resourceIdentifier != null) {
try {
InputSource inputSource = fEntityResolver.resolveEntity(pubId, sysId);
if (inputSource != null) {
String publicId = inputSource.getPublicId();
String systemId = inputSource.getSystemId();
String baseSystemId = resourceIdentifier.getBaseSystemId();
InputStream byteStream = inputSource.getByteStream();
Reader charStream = inputSource.getCharacterStream();
String encoding = inputSource.getEncoding();
XMLInputSource xmlInputSource =
new XMLInputSource(publicId, systemId, baseSystemId);
xmlInputSource.setByteStream(byteStream);
xmlInputSource.setCharacterStream(charStream);
xmlInputSource.setEncoding(encoding);
return xmlInputSource;
}
}
// error resolving entity
catch (SAXException e) {
Exception ex = e.getException();
if (ex == null) {
ex = e;
}
throw new XNIException(ex);
}
}
// unable to resolve entity
return null;
} // resolveEntity(String,String,String):XMLInputSource
}