/*
    * Copyright 2006 Thierry Guerin
    *
    * 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 org.exolab.castor.xml.wls8;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.Writer;
  import java.lang.reflect.Method;
  
  /**
   * Xerces-specific implementation of the Serializer interface. Uses reflection to get
   * the class and methods to avoid having dependencies towards Weblogic when Castor is
   * not used in a Weblogic server.
   * 
   * @author Thierry Guerin
   */
  public class WeblogicXercesSerializer extends WeblogicXercesImplementation implements org.exolab.castor.xml.Serializer {
      
      private static Class _serializerClass;
      private static Method _asDocumentHandler;
      private static Method _setOutputByteStream;
      private static Method _setOutputCharStream;
      private static Method _setOutputFormat;
  
      /** Xerces XMLSerializer instance to use for serialization. */
      private Object _serializer;
      static {
          // use reflection to get the methods
  
          // get the classes
          Class weblogicOutputFormat = null;
          try {
              _serializerClass = Class.forName("weblogic.apache.xml.serialize.XMLSerializer");
              weblogicOutputFormat = Class.forName("weblogic.apache.xml.serialize.OutputFormat");
          }
          catch (ClassNotFoundException e) {
              handleStaticInitException(e);
          }
          // get the methods
          // asDocumentHandler
          _asDocumentHandler = getMethod(_serializerClass, "asDocumentHandler", new Class[0]);
          
          // setOutputByteStream
          Class[] parameterOutputStream = {OutputStream.class};
          _setOutputByteStream = getMethod(_serializerClass, "setOutputByteStream", parameterOutputStream);
          
          // setOutputCharStream
          Class[] parameterWriter = {Writer.class};
          _setOutputCharStream = getMethod(_serializerClass, "setOutputCharStream", parameterWriter);
          
          // setOutputByteStream
          Class[] parameterOutputFormat = {weblogicOutputFormat};
          _setOutputFormat = getMethod(_serializerClass, "setOutputFormat", parameterOutputFormat);
          
      }
  
      /**
       * Creates an instance of this class.
       */
      public WeblogicXercesSerializer() {
          try {
              _serializer = _serializerClass.newInstance();
          }
          catch (InstantiationException e) {
              throw new RuntimeException(e.toString()); // java 1.3, can't wrap using the 1.4 constructor
          }
          catch (IllegalAccessException e) {
              throw new RuntimeException(e.toString()); // java 1.3, can't wrap using the 1.4 constructor
          }
      }
      
      /**
       * @inheritDoc
       * @deprecated
       */
      public org.xml.sax.DocumentHandler asDocumentHandler() throws IOException {
          return (org.xml.sax.DocumentHandler) invoke(_asDocumentHandler, new Object[0]);
      }
      
      /**
       * @inheritDoc
       */
      public void setOutputByteStream(OutputStream output) {
          Object[] params = {output};
          invoke(_setOutputByteStream, params);
      }
 
     /**
      * @inheritDoc
      */
     public void setOutputCharStream(Writer out) {
         Object[] params = {out};
         invoke(_setOutputCharStream, params);
     }
     
     /**
      * @inheritDoc
      */
     public void setOutputFormat(org.exolab.castor.xml.OutputFormat format) {
         Object[] params = {format.getFormat()};
         invoke(_setOutputFormat, params);
     }
     
     private Object invoke(Method method, Object[] params) {
         return invoke(_serializer, method, params);
     }
 }