Trace.java Source code

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Here is the source code for Trace.java

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/*
 * 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: Trace.java 470245 2006-11-02 06:34:33Z minchau $
 */
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.xalan.trace.PrintTraceListener;
import org.apache.xalan.trace.TraceManager;
import org.apache.xalan.transformer.TransformerImpl;

/**
 * Sample for demonstrating Xalan "trace" interface.
 * Usage: run in Trace directory: java Trace
 * For an extensions trace sample, run in extensions
 * directory: java Trace 3-java-namespace
 */
public class Trace {
    public static void main(String[] args) throws java.io.IOException, TransformerException,
            TransformerConfigurationException, java.util.TooManyListenersException, org.xml.sax.SAXException {
        String fileName = "foo";
        if (args.length > 0)
            fileName = args[0];

        // Set up a PrintTraceListener object to print to a file.
        java.io.FileWriter fw = new java.io.FileWriter("events.log");
        java.io.PrintWriter pw = new java.io.PrintWriter(fw, true);
        PrintTraceListener ptl = new PrintTraceListener(pw);

        // Print information as each node is 'executed' in the stylesheet.
        ptl.m_traceElements = true;
        // Print information after each result-tree generation event.
        ptl.m_traceGeneration = true;
        // Print information after each selection event.
        ptl.m_traceSelection = true;
        // Print information whenever a template is invoked.
        ptl.m_traceTemplates = true;
        // Print information whenever an extension call is made.
        ptl.m_traceExtension = true;

        // Set up the transformation    
        TransformerFactory tFactory = TransformerFactory.newInstance();
        Transformer transformer = tFactory.newTransformer(new StreamSource(fileName + ".xsl"));

        // Cast the Transformer object to TransformerImpl.
        if (transformer instanceof TransformerImpl) {
            TransformerImpl transformerImpl = (TransformerImpl) transformer;
            // Register the TraceListener with a TraceManager associated 
            // with the TransformerImpl.
            TraceManager trMgr = transformerImpl.getTraceManager();
            trMgr.addTraceListener(ptl);

            // Perform the transformation --printing information to
            // the events log during the process.
            transformer.transform(new StreamSource(fileName + ".xml"),
                    new StreamResult(new java.io.FileWriter(fileName + ".out")));
        }
        // Close the PrintWriter and FileWriter.
        pw.close();
        fw.close();
        System.out.println("**The output is in " + fileName + ".out; the log is in events.log ****");

    }
}