content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001-2004 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 jaxp.sun.org.apache.xerces.internal.util;
  
  
  import jaxp.sun.org.apache.xerces.internal.xni.XNIException;
  import jaxp.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier;
  import jaxp.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
  import jaxp.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
  import jaxp.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
   */
  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
  