/*
    * 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());
     }
   }
 }