content: /*
   * 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 mf.org.apache.xerces.util;
  
  import org.xml.sax.EntityResolver;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Reader;
  
  import mf.org.apache.xerces.xni.XMLResourceIdentifier;
  import mf.org.apache.xerces.xni.XNIException;
  import mf.org.apache.xerces.xni.parser.XMLEntityResolver;
  import mf.org.apache.xerces.xni.parser.XMLInputSource;
  
  /**
   * This class wraps a SAX entity resolver in an XNI entity resolver.
   *
   * @author Andy Clark, IBM
   * @version $Id: EntityResolverWrapper.java 699892 2008-09-28 21:08:27Z mrglavas $
   * @see EntityResolver
   */
  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);
      } // <init>(EntityResolver)
  
      //
      // Public methods
      //
  
      /**
       * Returns the SAX entity resolver.
       */
      public EntityResolver getEntityResolver() {
          return fEntityResolver;
      } // getEntityResolver():EntityResolver
  
      /**
       * Sets the SAX entity resolver.
       */
      public void setEntityResolver(EntityResolver entityResolver) {
          fEntityResolver = entityResolver;
      } // setEntityResolver(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.
       */
      @Override
      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
  }
  