/*
    * Copyright 2006 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, used for JDK 5
   * only where Xerecs has been integrated with the core code base.
   * 
   * @author <a href="mailto:werner DOT guttmann AT gmx DOT net">Werner
   *         Guttmann</a>
   * @version $Revision: 6216 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr
   *          2006) $
   * @since 1.1
   */
  public abstract class BaseXercesJDK5Serializer implements
          org.exolab.castor.xml.Serializer {
  
      /**
       * Logger instance for logging.
       */
      private final Log LOG = LogFactory.getLog(getClass());
  
      /**
       * Xerces XMLSerializer instance to use for serialization.
       */
      private Object _serializer;
  
      /**
       * Creates an instance of this class.
       */
      public BaseXercesJDK5Serializer() {
          try {
              _serializer = Class.forName(getPackageName() + ".XMLSerializer")
                      .newInstance();
          } catch (Exception except) {
              throw new RuntimeException(Messages.format(
                      "conf.failedInstantiateSerializer", getPackageName()
                              + ".XMLSerializer", except));
          }
      }
  
      protected abstract String getPackageName();
      
      /**
       * @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());
          }
      }
  
      /**
       * @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());
          }
      }
 
     /**
      * @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(getPackageName()
                     + ".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());
         }
     }
 
     /**
      * @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());
         }
     }
 }