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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family.
This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building
parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is
the reference implementation of XNI but other parser components, configurations, and parsers can be written
using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual.
Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema
1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema
Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for
evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation
of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete
implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML
Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that
it does not yet provide an option to enable normalization checking as described in section 2.13 of this
specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly
serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xerces.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import org.apache.xerces.xni.XMLResourceIdentifier;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.parser.XMLEntityResolver;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;
/**
* 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 1368777 2012-08-03 02:17:53Z mrglavas $
*/
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 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 {
// 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