samples/CompiledApplet/TransformApplet.java - xalan-java - Git at Google

 /*
  * 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.
  */
 /*
  * $Id$
  */

 import java.applet.Applet;

 import java.awt.BorderLayout;
 import java.awt.Button;
 import java.awt.Frame;
 import java.awt.Label;
 import java.awt.Panel;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;

 import java.io.PrintWriter;
 import java.io.StringWriter;

 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.TransformerException;
 import javax.xml.transform.ErrorListener;
 import javax.xml.transform.stream.StreamResult;
 import javax.xml.transform.stream.StreamSource;

 /**
  * This applet demonstrates how XSL transformations can be made to run in
  * browsers without native XSLT support.
  *
  * Note that the XSLTC transformation engine is invoked through the JAXP
  * interface, using the XSLTC "use-classpath" attribute.  The
  * "use-classpath" attribute specifies to the XSLTC TransformerFactory
  * that a precompiled version of the stylesheet (translet) may be available,
  * and that that should be used in preference to recompiling the stylesheet.
  * @author Morten Jorgensen
  * @author Jacek Ambroziak
  */
 public final class TransformApplet extends Applet {
     TransformerFactory tf;
     TransformDelegate transformThread;
     /**
      * This class implements a dialog box used for XSL messages/comments
      */
     public class MessageFrame extends Frame {

         public Frame frame;

         public class ButtonHandler implements ActionListener {
             public void actionPerformed(ActionEvent e) {
                 frame.setVisible(false);
             }
         }

         /**
          * This method handles xml:message and xsl:comment by displaying
          * the message/comment in a dialog box.
          */
         public MessageFrame(String title, String message) {
             super(title);
             frame = this; // Make visible to ButtonHandler
             setSize(320,200);

             // Create a panel for the message itself
             Panel center = new Panel();
             center.add(new Label(message));

             // Create a panel for the 'OK' button
             Panel bottom = new Panel();
             Button okButton = new Button("   OK   ");
             okButton.addActionListener(new ButtonHandler());
             bottom.add(okButton);

             // Add the two panels to the window/frame
             add(center, BorderLayout.CENTER);
             add(bottom,BorderLayout.SOUTH);

             // Show the whole thing
             setVisible(true);
         }

     }

     /**
      * The applet uses this method to display messages and comments
      * generated by xsl:message and xsl:comment elements.
      */
     public class AppletErrorListener implements ErrorListener {
         public void displayMessage(TransformerException e) {
             MessageFrame z = new MessageFrame("XSL transformation alert",
                                               e.getMessageAndLocation());
         }

         public void error(TransformerException e) {
             displayMessage(e);
         }

         public void fatalError(TransformerException e) {
             displayMessage(e);
         }

         public void warning(TransformerException e) {
                     displayMessage(e);
         }
     }

     /**
      * This method is the main body of the applet. The method is called
      * by some JavaScript code in an HTML document.
      */
     public synchronized String transform(Object arg1, Object arg2) {
         final String stylesheetURL = (String)arg1;
         final String documentURL = (String)arg2;

         transformThread.setStylesheetURL(stylesheetURL);
         transformThread.setDocumentURL(documentURL);
         transformThread.setWaiting(false);
         transformThread.wakeUp();
         try{
             wait();
         } catch (InterruptedException e){}
         return transformThread.getOutput();
     }

     public void start() {
         transform(getParameter("stylesheet-name"),
                   getParameter("input-document"));
     }
     public void destroy() {
         transformThread.destroy();
     }
     public void init() {
         tf = TransformerFactory.newInstance();
         try {
             tf.setAttribute("use-classpath", Boolean.TRUE);
         } catch (IllegalArgumentException iae) {
             System.err.println("Could not set XSLTC-specific TransformerFactory"
                                + " attributes.  Transformation failed.");
         }
         // Another thread is created to keep the context class loader
         // information.  When use JDK 1.4 plugin for browser, to get around the
         // problem with the bundled old version of xalan and endorsed class
         // loading mechanism
         transformThread = new TransformDelegate(true);
         Thread t = new Thread(transformThread);
         t.setName("transformThread");
         t.start();
     }
     public String getOutput(){
         return transformThread.getOutput();
     }
     public synchronized void wakeUp() {
         notifyAll();
     }
     class TransformDelegate implements Runnable {
         private boolean isRunning, isWaiting;
         private String stylesheetURL, documentURL;
         private String outPut;
         public TransformDelegate(boolean arg) {
             isRunning = arg;
             isWaiting = true;
         }
         public synchronized void run() {
             while(isRunning){
                 while(isWaiting){
                     try {
                         wait();
                     } catch (InterruptedException e){}
                 }
                 transform();
                 isWaiting = true;
                 TransformApplet.this.wakeUp();
             }
         }

         public void setStylesheetURL(String arg){
             stylesheetURL = arg;
         }
         public void setDocumentURL(String arg) {
             documentURL = arg;
         }
         public String getStylesheetURL(){
             return stylesheetURL;
         }
         public String getDocumentURL() {
             return documentURL;
         }
         public void setWaiting(boolean arg) {
             isWaiting = arg;
         }
         public void destroy() {
             isRunning = false;
         }
         public synchronized void wakeUp() {
             notifyAll();
         }
         public String getOutput(){
             return outPut;
         }

         public void transform(){
             String xslURL = getStylesheetURL();
             String docURL = getDocumentURL();
             // Initialise the output stream
             StringWriter sout = new StringWriter();
             PrintWriter out = new PrintWriter(sout);
             // Check that the parameters are valid
             try {
                 if (xslURL == null || docURL == null) {
                     out.println("<h1>Transformation error</h1>");
                     out.println("The parameters <b><tt>stylesheetURL</tt></b> "+
                                 "and <b><tt>source</tt></b> must be specified");
                 } else {
                     Transformer t = tf.newTransformer(new StreamSource(xslURL));
                     t.setErrorListener(new AppletErrorListener());

                     final long start = System.currentTimeMillis();

                     t.transform(new StreamSource(docURL),
                                 new StreamResult(out));

                     final long done = System.currentTimeMillis() - start;
                     out.println("<!-- transformed by XSLTC in " + done
                                 + "msecs -->");
                 }
                 // Now close up the sink, and return the HTML output in the
                 // StringWrite object as a string.
                 out.close();
                 System.err.println("Transformation complete!");
                 System.err.println(sout.toString());
                 outPut = sout.toString();
                 sout.close();
             } catch (RuntimeException e) {
                 out.println("<h1>RTE</h1>");
                 out.close();
                 outPut = sout.toString();
             } catch (Exception e) {
                 out.println("<h1>exception</h1>");
                 out.println(e.toString());
                 out.close();
                 outPut = sout.toString();
             }
         }
     }
 }
	/*
	* 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.
	*/
	/*
	* $Id$
	*/

	import java.applet.Applet;

	import java.awt.BorderLayout;
	import java.awt.Button;
	import java.awt.Frame;
	import java.awt.Label;
	import java.awt.Panel;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;

	import java.io.PrintWriter;
	import java.io.StringWriter;

	import javax.xml.transform.Transformer;
	import javax.xml.transform.TransformerFactory;
	import javax.xml.transform.TransformerException;
	import javax.xml.transform.ErrorListener;
	import javax.xml.transform.stream.StreamResult;
	import javax.xml.transform.stream.StreamSource;

	/**
	* This applet demonstrates how XSL transformations can be made to run in
	* browsers without native XSLT support.
	*
	* Note that the XSLTC transformation engine is invoked through the JAXP
	* interface, using the XSLTC "use-classpath" attribute. The
	* "use-classpath" attribute specifies to the XSLTC TransformerFactory
	* that a precompiled version of the stylesheet (translet) may be available,
	* and that that should be used in preference to recompiling the stylesheet.
	* @author Morten Jorgensen
	* @author Jacek Ambroziak
	*/
	public final class TransformApplet extends Applet {
	TransformerFactory tf;
	TransformDelegate transformThread;
	/**
	* This class implements a dialog box used for XSL messages/comments
	*/
	public class MessageFrame extends Frame {

	public Frame frame;

	public class ButtonHandler implements ActionListener {
	public void actionPerformed(ActionEvent e) {
	frame.setVisible(false);
	}
	}

	/**
	* This method handles xml:message and xsl:comment by displaying
	* the message/comment in a dialog box.
	*/
	public MessageFrame(String title, String message) {
	super(title);
	frame = this; // Make visible to ButtonHandler
	setSize(320,200);

	// Create a panel for the message itself
	Panel center = new Panel();
	center.add(new Label(message));

	// Create a panel for the 'OK' button
	Panel bottom = new Panel();
	Button okButton = new Button(" OK ");
	okButton.addActionListener(new ButtonHandler());
	bottom.add(okButton);

	// Add the two panels to the window/frame
	add(center, BorderLayout.CENTER);
	add(bottom,BorderLayout.SOUTH);

	// Show the whole thing
	setVisible(true);
	}

	}

	/**
	* The applet uses this method to display messages and comments
	* generated by xsl:message and xsl:comment elements.
	*/
	public class AppletErrorListener implements ErrorListener {
	public void displayMessage(TransformerException e) {
	MessageFrame z = new MessageFrame("XSL transformation alert",
	e.getMessageAndLocation());
	}

	public void error(TransformerException e) {
	displayMessage(e);
	}

	public void fatalError(TransformerException e) {
	displayMessage(e);
	}

	public void warning(TransformerException e) {
	displayMessage(e);
	}
	}

	/**
	* This method is the main body of the applet. The method is called
	* by some JavaScript code in an HTML document.
	*/
	public synchronized String transform(Object arg1, Object arg2) {
	final String stylesheetURL = (String)arg1;
	final String documentURL = (String)arg2;

	transformThread.setStylesheetURL(stylesheetURL);
	transformThread.setDocumentURL(documentURL);
	transformThread.setWaiting(false);
	transformThread.wakeUp();
	try{
	wait();
	} catch (InterruptedException e){}
	return transformThread.getOutput();
	}

	public void start() {
	transform(getParameter("stylesheet-name"),
	getParameter("input-document"));
	}
	public void destroy() {
	transformThread.destroy();
	}
	public void init() {
	tf = TransformerFactory.newInstance();
	try {
	tf.setAttribute("use-classpath", Boolean.TRUE);
	} catch (IllegalArgumentException iae) {
	System.err.println("Could not set XSLTC-specific TransformerFactory"
	+ " attributes. Transformation failed.");
	}
	// Another thread is created to keep the context class loader
	// information. When use JDK 1.4 plugin for browser, to get around the
	// problem with the bundled old version of xalan and endorsed class
	// loading mechanism
	transformThread = new TransformDelegate(true);
	Thread t = new Thread(transformThread);
	t.setName("transformThread");
	t.start();
	}
	public String getOutput(){
	return transformThread.getOutput();
	}
	public synchronized void wakeUp() {
	notifyAll();
	}
	class TransformDelegate implements Runnable {
	private boolean isRunning, isWaiting;
	private String stylesheetURL, documentURL;
	private String outPut;
	public TransformDelegate(boolean arg) {
	isRunning = arg;
	isWaiting = true;
	}
	public synchronized void run() {
	while(isRunning){
	while(isWaiting){
	try {
	wait();
	} catch (InterruptedException e){}
	}
	transform();
	isWaiting = true;
	TransformApplet.this.wakeUp();
	}
	}

	public void setStylesheetURL(String arg){
	stylesheetURL = arg;
	}
	public void setDocumentURL(String arg) {
	documentURL = arg;
	}
	public String getStylesheetURL(){
	return stylesheetURL;
	}
	public String getDocumentURL() {
	return documentURL;
	}
	public void setWaiting(boolean arg) {
	isWaiting = arg;
	}
	public void destroy() {
	isRunning = false;
	}
	public synchronized void wakeUp() {
	notifyAll();
	}
	public String getOutput(){
	return outPut;
	}

	public void transform(){
	String xslURL = getStylesheetURL();
	String docURL = getDocumentURL();
	// Initialise the output stream
	StringWriter sout = new StringWriter();
	PrintWriter out = new PrintWriter(sout);
	// Check that the parameters are valid
	try {
	if (xslURL == null \|\| docURL == null) {
	out.println("<h1>Transformation error</h1>");
	out.println("The parameters <b><tt>stylesheetURL</tt></b> "+
	"and <b><tt>source</tt></b> must be specified");
	} else {
	Transformer t = tf.newTransformer(new StreamSource(xslURL));
	t.setErrorListener(new AppletErrorListener());

	final long start = System.currentTimeMillis();

	t.transform(new StreamSource(docURL),
	new StreamResult(out));

	final long done = System.currentTimeMillis() - start;
	out.println("<!-- transformed by XSLTC in " + done
	+ "msecs -->");
	}
	// Now close up the sink, and return the HTML output in the
	// StringWrite object as a string.
	out.close();
	System.err.println("Transformation complete!");
	System.err.println(sout.toString());
	outPut = sout.toString();
	sout.close();
	} catch (RuntimeException e) {
	out.println("<h1>RTE</h1>");
	out.close();
	outPut = sout.toString();
	} catch (Exception e) {
	out.println("<h1>exception</h1>");
	out.println(e.toString());
	out.close();
	outPut = sout.toString();
	}
	}
	}
	}