- /*
- * Copyright 2004 The Apache Software Foundation.
- *
- * Licensed 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 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.impl.ExternalSubsetResolver;
- import com.sun.org.apache.xerces.internal.impl.XMLEntityDescription;
- import com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier;
- import com.sun.org.apache.xerces.internal.xni.XNIException;
- import com.sun.org.apache.xerces.internal.xni.grammars.XMLDTDDescription;
- import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
-
- import org.xml.sax.EntityResolver;
- import org.xml.sax.ext.EntityResolver2;
- import org.xml.sax.InputSource;
- import org.xml.sax.SAXException;
-
- /**
- * <p>This class wraps a SAX entity resolver (EntityResolver2) in an XNI entity resolver.</p>
- *
- * @author Michael Glavassevich, IBM
- *
- * @version $Id: EntityResolver2Wrapper.java,v 1.2 2004/05/07 09:00:32 vk112360 Exp $
- */
- public class EntityResolver2Wrapper
- implements ExternalSubsetResolver {
-
- //
- // Data
- //
-
- /** An instance of SAX2 Extensions 1.1's EntityResolver2. */
- protected EntityResolver2 fEntityResolver;
-
- //
- // Constructors
- //
-
- /** Default constructor. */
- public EntityResolver2Wrapper() {}
-
- /**
- * <p>Creates a new instance wrapping the given SAX entity resolver.</p>
- *
- * @param entityResolver the SAX entity resolver to wrap
- */
- public EntityResolver2Wrapper(EntityResolver2 entityResolver) {
- setEntityResolver(entityResolver);
- } // <init>(EntityResolver2)
-
- //
- // Public methods
- //
-
- /**
- * <p>Sets the SAX entity resolver wrapped by this object.</p>
- *
- * @param entityResolver the SAX entity resolver to wrap
- */
- public void setEntityResolver(EntityResolver2 entityResolver) {
- fEntityResolver = entityResolver;
- } // setEntityResolver(EntityResolver2)
-
- /**
- * <p>Returns the SAX entity resolver wrapped by this object.</p>
- *
- * @return the SAX entity resolver wrapped by this object
- */
- public EntityResolver2 getEntityResolver() {
- return fEntityResolver;
- } // getEntityResolver():EntityResolver2
-
- //
- // ExternalSubsetResolver methods
- //
-
- /**
- * <p>Locates an external subset for documents which do not explicitly
- * provide one. If no external subset is provided, this method should
- * return <code>null</code>.</p>
- *
- * @param grammarDescription a description of the DTD
- *
- * @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 getExternalSubset(XMLDTDDescription grammarDescription)
- throws XNIException, IOException {
-
- if (fEntityResolver != null) {
-
- String name = grammarDescription.getRootName();
- String baseURI = grammarDescription.getBaseSystemId();
-
- // Resolve using EntityResolver2
- try {
- InputSource inputSource = fEntityResolver.getExternalSubset(name, baseURI);
- return (inputSource != null) ? createXMLInputSource(inputSource, baseURI) : null;
- }
- // error resolving external subset
- catch (SAXException e) {
- Exception ex = e.getException();
- if (ex == null) {
- ex = e;
- }
- throw new XNIException(ex);
- }
- }
-
- // unable to resolve external subset
- return null;
-
- } // getExternalSubset(XMLDTDDescription):XMLInputSource
-
- //
- // 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 {
-
- if (fEntityResolver != null) {
-
- String pubId = resourceIdentifier.getPublicId();
- String sysId = resourceIdentifier.getExpandedSystemId();
- String baseURI = resourceIdentifier.getBaseSystemId();
- String name = null;
- if (resourceIdentifier instanceof XMLDTDDescription) {
- name = "[dtd]";
- }
- else if (resourceIdentifier instanceof XMLEntityDescription) {
- name = ((XMLEntityDescription) resourceIdentifier).getEntityName();
- }
-
- // When all of the parameters 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
- if (pubId == null && sysId == null && baseURI == null && name == null) {
- return null;
- }
-
- // Resolve using EntityResolver2
- try {
- InputSource inputSource =
- fEntityResolver.resolveEntity(name, pubId, baseURI, sysId);
- return (inputSource != null) ? createXMLInputSource(inputSource, baseURI) : null;
- }
- // 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(XMLResourceIdentifier):XMLInputSource
-
- /**
- * Creates an XMLInputSource from a SAX InputSource.
- */
- private XMLInputSource createXMLInputSource(InputSource source, String baseURI) {
-
- String publicId = source.getPublicId();
- String systemId = source.getSystemId();
- String baseSystemId = baseURI;
- InputStream byteStream = source.getByteStream();
- Reader charStream = source.getCharacterStream();
- String encoding = source.getEncoding();
- XMLInputSource xmlInputSource =
- new XMLInputSource(publicId, systemId, baseSystemId);
- xmlInputSource.setByteStream(byteStream);
- xmlInputSource.setCharacterStream(charStream);
- xmlInputSource.setEncoding(encoding);
- return xmlInputSource;
-
- } // createXMLInputSource(InputSource,String):XMLInputSource
-
- } // class EntityResolver2Wrapper