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package com.sun.org.apache.xerces.internal.util;
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.grammars.XMLGrammarDescription;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
import org.w3c.dom.ls.LSResourceResolver;
import org.w3c.dom.ls.LSInput;
import java.io.InputStream;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
/**
* This class wraps DOM entity resolver to XNI entity resolver.
*
* @see LSResourceResolver
*
* @author Gopal Sharma, SUN MicroSystems Inc.
* @author Elena Litani, IBM
* @author Ramesh Mandava, Sun Microsystems
* @version $Id: DOMEntityResolverWrapper.java,v 1.6 2010-11-01 04:40:14 joehw Exp $
*/
public class DOMEntityResolverWrapper
implements XMLEntityResolver {
//
// Data
//
/** XML 1.0 type constant according to DOM L3 LS CR spec "http://www.w3.org/TR/2003/CR-DOM-Level-3-LS-20031107" */
private static final String XML_TYPE = "http://www.w3.org/TR/REC-xml";
/** XML Schema constant according to DOM L3 LS CR spec "http://www.w3.org/TR/2003/CR-DOM-Level-3-LS-20031107" */
private static final String XSD_TYPE = "http://www.w3.org/2001/XMLSchema";
/** The DOM entity resolver. */
protected LSResourceResolver fEntityResolver;
//
// Constructors
//
/** Default constructor. */
public DOMEntityResolverWrapper() {}
/** Wraps the specified DOM entity resolver. */
public DOMEntityResolverWrapper(LSResourceResolver entityResolver) {
setEntityResolver(entityResolver);
} // LSResourceResolver
//
// Public methods
//
/** Sets the DOM entity resolver. */
public void setEntityResolver(LSResourceResolver entityResolver) {
fEntityResolver = entityResolver;
} // setEntityResolver(LSResourceResolver)
/** Returns the DOM entity resolver. */
public LSResourceResolver getEntityResolver() {
return fEntityResolver;
} // getEntityResolver():LSResourceResolver
//
// XMLEntityResolver methods
//
/**
* Resolves an external parsed entity. If the entity cannot be
* resolved, this method should return null.
*
* @param resourceIdentifier description of the resource to be revsoved
* @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 {
// resolve entity using DOM entity resolver
if (fEntityResolver != null) {
// For entity resolution the type of the resource would be XML TYPE
// DOM L3 LS spec mention only the XML 1.0 recommendation right now
LSInput inputSource =
resourceIdentifier == null
? fEntityResolver.resolveResource(
null,
null,
null,
null,
null)
: fEntityResolver.resolveResource(
getType(resourceIdentifier),
resourceIdentifier.getNamespace(),
resourceIdentifier.getPublicId(),
resourceIdentifier.getLiteralSystemId(),
resourceIdentifier.getBaseSystemId());
if (inputSource != null) {
String publicId = inputSource.getPublicId();
String systemId = inputSource.getSystemId();
String baseSystemId = inputSource.getBaseURI();
InputStream byteStream = inputSource.getByteStream();
Reader charStream = inputSource.getCharacterStream();
String encoding = inputSource.getEncoding();
String data = inputSource.getStringData();
/**
* An LSParser looks at inputs specified in LSInput in
* the following order: characterStream, byteStream,
* stringData, systemId, publicId.
*/
XMLInputSource xmlInputSource =
new XMLInputSource(publicId, systemId, baseSystemId);
if (charStream != null) {
xmlInputSource.setCharacterStream(charStream);
}
else if (byteStream != null) {
xmlInputSource.setByteStream((InputStream) byteStream);
}
else if (data != null && data.length() != 0) {
xmlInputSource.setCharacterStream(new StringReader(data));
}
xmlInputSource.setEncoding(encoding);
return xmlInputSource;
}
}
// unable to resolve entity
return null;
} // resolveEntity(String,String,String):XMLInputSource
/** Determines the type of resource being resolved **/
private String getType(XMLResourceIdentifier resourceIdentifier) {
if (resourceIdentifier instanceof XMLGrammarDescription) {
XMLGrammarDescription desc = (XMLGrammarDescription) resourceIdentifier;
if (XMLGrammarDescription.XML_SCHEMA.equals(desc.getGrammarType())) {
return XSD_TYPE;
}
}
return XML_TYPE;
} // getType(XMLResourceIdentifier):String
} // DOMEntityResolverWrapper