/*
    * Copyright 2005 Werner Guttmann
    *
    * 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;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.Writer;
  import java.lang.reflect.Method;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.castor.core.util.Messages;
  import org.xml.sax.DocumentHandler;
  
  /**
   * Xerces-specific implementation of the Serializer interface.
   * 
   * @author <a href="mailto:werner DOT guttmann AT gmx DOT net">Werner Guttmann</a>
   * @version $Revision$ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
   */
  public class XercesSerializer implements org.exolab.castor.xml.Serializer {
  	private static final Log LOG = LogFactory.getLog(XercesSerializer.class);
  	
      /**
       * Xerces XMLSerializer instance to use for serialization.
       */
      private Object _serializer;
  
      /**
       * Creates an instance of this class.
       */
      public XercesSerializer() {
          try {
              _serializer =  
              Class.forName("org.apache.xml.serialize.XMLSerializer").newInstance();
          } catch (Exception except) {
              throw new RuntimeException(
                      Messages.format("conf.failedInstantiateSerializer", 
                              "org.apache.xml.serialize.XMLSerializer", except));
          }
      }
      
      /**
       * @see org.exolab.castor.xml.Serializer#setOutputCharStream(java.io.Writer)
       * {@inheritDoc}
       */
      public void setOutputCharStream(final Writer out) {
      	Method method;
  		try {
  			method = _serializer.getClass().getMethod(
                      "setOutputCharStream", new Class[] {Writer.class} );
  	    	method.invoke(_serializer, new Object[] { out });
  		} catch (Exception e) {
              String msg = "Problem invoking XMLSerializer.setOutputCharStream()";
  			LOG.error(msg, e);
  			throw new RuntimeException(msg + e.getMessage()); 
  		}
          // _serializer.setOutputCharStream(out);
      }
  
      /**
       * @see org.exolab.castor.xml.Serializer#asDocumentHandler()
       * {@inheritDoc}
       */
      public DocumentHandler asDocumentHandler() throws IOException {
      	Method method;
  		try {
  			method = _serializer.getClass().getMethod(
                      "asDocumentHandler", (Class[]) null);
  	    	return (DocumentHandler) method.invoke(_serializer, (Object[]) null);
  		} catch (Exception e) {
              String msg = "Problem invoking XMLSerializer.asDocumentHandler()";
  			LOG.error(msg, e);
  			throw new RuntimeException(msg + e.getMessage()); 
  		}
          // return _serializer.asDocumentHandler();
      }
  
      /**
       * @see org.exolab.castor.xml.Serializer
       *      #setOutputFormat(org.exolab.castor.xml.OutputFormat)
       * {@inheritDoc}
       */
      public void setOutputFormat(final OutputFormat format) {
      	Method method;
  		try {
 			Class outputFormatClass =
 				Class.forName("org.apache.xml.serialize.OutputFormat");
 			method = _serializer.getClass().getMethod(
                     "setOutputFormat", new Class[] {outputFormatClass } );
 	    	method.invoke(_serializer, new Object[] { format.getFormat() });
 		} catch (Exception e) {
             String msg = "Problem invoking XMLSerializer.setOutputFormat()";
 			LOG.error(msg, e);
 			throw new RuntimeException(msg + e.getMessage()); 
 		}
         // _serializer.setOutputFormat((OutputFormat) format.getFormat());
     }
 
     /**
      * @see org.exolab.castor.xml.Serializer#setOutputByteStream(java.io.OutputStream)
      * {@inheritDoc}
      */
     public void setOutputByteStream(final OutputStream output) {
     	Method method;
 		try {
 			method = _serializer.getClass().getMethod(
                     "setOutputByteStream", new Class[] {OutputStream.class} );
 	    	method.invoke(_serializer, new Object[] { output });
 		} catch (Exception e) {
             String msg = "Problem invoking XMLSerializer.setOutputByteStream()";
 			LOG.error(msg, e);
 			throw new RuntimeException(msg + e.getMessage()); 
 		}
         // _serializer.setOutputByteStream(output);
     }
 }