/*
 * 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());
    }
  }
}
