content: /*
   *  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
   *
   *      https://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.apache.tools.ant.taskdefs.optional;
  
  import java.io.PrintWriter;
  import java.util.TooManyListenersException;
  
  import javax.xml.transform.Transformer;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.taskdefs.XSLTProcess;
  import org.apache.xalan.trace.PrintTraceListener;
  import org.apache.xalan.transformer.TransformerImpl;
  
  /**
   * Sets up trace support for a given transformer.
   *
   * @since Ant 1.8.0
   */
  public class Xalan2TraceSupport implements XSLTTraceSupport {
      public void configureTrace(final Transformer t,
                                 final XSLTProcess.TraceConfiguration conf) {
          if (t instanceof TransformerImpl && conf != null) {
              final PrintWriter w = new PrintWriter(conf.getOutputStream(), false);
              final PrintTraceListener tl = new PrintTraceListener(w);
              tl.m_traceElements = conf.getElements();
              tl.m_traceExtension = conf.getExtension();
              tl.m_traceGeneration = conf.getGeneration();
              tl.m_traceSelection = conf.getSelection();
              tl.m_traceTemplates = conf.getTemplates();
              try {
                  ((TransformerImpl) t).getTraceManager().addTraceListener(tl);
              } catch (final TooManyListenersException tml) {
                  throw new BuildException(tml);
              }
          }
      }
  }
  