code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.
   */
  /*
   * $Id$
   */
  package servlet;
  
  import java.io.*;
  import org.xml.sax.*;
  import org.apache.xml.utils.DefaultErrorHandler;
  
  /*****************************************************************************************************
   * ApplyXSLTListener provides a buffered listener essential for capturing, and then subsequently
   * reporting, XML and XSL processor messages which may be of use in debugging XML+XSL processed at
   * the server.
   *
   * @author Spencer Shepard (sshepard@us.ibm.com)
   * @author R. Adam King (rak@us.ibm.com)
   * @author Tom Rowe (trowe@us.ibm.com)
   *
   *****************************************************************************************************/
  
  public class ApplyXSLTListener extends DefaultErrorHandler implements ErrorHandler
  {
  
      /**
        * Output stream
        */
      private ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  
      /**
        * Buffered output stream
        */
      public PrintWriter out = null;
  
      /**
        * Constructor.
        */
      public ApplyXSLTListener()
      {
        out = new PrintWriter(new BufferedOutputStream(outStream), true);
      }
  
      /**
        * Receive notification of a warning.
        *
        * @param spe The warning information encapsulated in a SAX parse exception.
        */
      public void warning(SAXParseException spe)
      {
  	out.println("Parser Warning: " + spe.getMessage());
      }
  
      /**
        * Receive notification of a recoverable error.
        *
        * @param spe The error information encapsulated in a SAX parse exception.
        */
      public void error(SAXParseException spe)
      {
  	out.println("Parser Error: " + spe.getMessage());
      }
  
      /**
        * Receive notification of a non-recoverable error.
        *
        * @param spe The error information encapsulated in a SAX parse exception.
        * @exception SAXException Always thrown
        */
      public void fatalError(SAXParseException spe)
      throws SAXException
      {
  	out.println("Parser Fatal Error: " + spe.getMessage());
  	throw spe;
      }
  
      /**
        * Returns the buffered processing message(s).
        * @return Buffered processing message(s)
        */
      public String getMessage()
      {
  	return outStream.toString();
      }
  }
  
  