Package

Source Code of TransformApplet

/*
* @(#)$Id: TransformApplet.java,v 1.6 2003/01/30 15:59:24 zongaro Exp $
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
*    nor may "Apache" appear in their name, without prior written
*    permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com.  For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Morten Jorgensen
* @author Jacek Ambroziak
*
*/

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.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.xalan.xsltc.DOM;
import org.apache.xalan.xsltc.dom.DOMImpl;
import org.apache.xalan.xsltc.dom.DTDMonitor;
import org.apache.xalan.xsltc.runtime.AbstractTranslet;
import org.apache.xalan.xsltc.runtime.MessageHandler;
import org.apache.xalan.xsltc.runtime.output.TransletOutputHandlerFactory;

import org.xml.sax.XMLReader;

/**
* This applet demonstrates how XSL transformations can be made run in
* browsers without native XSLT support.
*
* Note that the XSLTC transformation engine is invoked through its native
* interface and not the javax.xml.transform (JAXP) interface. This because
* XSLTC still does not offer precompiled transformations through JAXP.
*/
public final class TransformApplet extends Applet {

    // Single document cache
    private String _documentUrl = "";
    private DOMImpl _dom = null;
    private DTDMonitor _dtdMonitor = null;

    private static final String NAMESPACE_FEATURE =
  "http://xml.org/sax/features/namespaces";

    /**
     * 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 fecking thing
      setVisible(true);
  }

    }

    /**
     * The appled uses this method to display messages and comments
     * generated by xsl:message and xsl:comment elements.
     */
    public class AppletMessageHandler extends MessageHandler {
  public void displayMessage(String msg) {
      MessageFrame z = new MessageFrame("XSL transformation alert",msg);
  }
    }

    /**
     * Reads the input document from the supplied URL and builds the
     * internal "DOM" tree.
     */
    private DOM getDOM(String url) throws Exception {
  // Check if the document is already in the 1-document cache
  if (url.equals(_documentUrl) == false) {

      // Create a SAX parser and get the XMLReader object it uses
      final SAXParserFactory factory = SAXParserFactory.newInstance();
      try {
    factory.setFeature(NAMESPACE_FEATURE,true);
      }
      catch (Exception e) {
    factory.setNamespaceAware(true);
      }
      final SAXParser parser = factory.newSAXParser();
      final XMLReader reader = parser.getXMLReader();

      // Set the DOM's builder as the XMLReader's SAX2 content handler
      _dom = new DOMImpl();
      reader.setContentHandler(_dom.getBuilder());

      // Create a DTD monitor and pass it to the XMLReader object
      _dtdMonitor = new DTDMonitor();
      _dtdMonitor.handleDTD(reader);

      // Parse the input document
      reader.parse(url);

      // Update the 1-document cahce with this DOM
      _documentUrl = url;
  }
  return _dom;
    }

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

  // Convert the two arguments to strings.
  final String transletName = (String)arg1;
  final String documentUrl = (String)arg2;

  // Initialise the output stream
  final StringWriter sout = new StringWriter();
  final PrintWriter out = new PrintWriter(sout);

  try {
      // Check that the parameters are valid
      if (transletName == null || documentUrl == null) {
    out.println("<h1>Transformation error</h1>");
    out.println("The parameters <b><tt>class</tt></b> "+
          "and <b><tt>source</tt></b> must be specified");
      }
      else {
    // Instanciate a message handler for xsl:message/xsl:comment
    AppletMessageHandler msgHandler = new AppletMessageHandler();

    // Get a refenrence to the translet class
    final Class tc = Class.forName(transletName);

    // Instanciate and initialise the tranlet object
    AbstractTranslet translet = (AbstractTranslet)tc.newInstance();
    ((AbstractTranslet)translet).setMessageHandler(msgHandler);

    // Create output handler
    TransletOutputHandlerFactory tohFactory =
        TransletOutputHandlerFactory.newInstance();
    tohFactory.setOutputType(TransletOutputHandlerFactory.STREAM);
    tohFactory.setEncoding(translet._encoding);
    tohFactory.setOutputMethod(translet._method);
    tohFactory.setWriter(out);

    getDOM(documentUrl);

    final long start = System.currentTimeMillis();

    // Set size of key/id indices
    translet.setIndexSize(_dom.getSize());
    // If there are any elements with ID attributes, build an index

    _dtdMonitor.buildIdIndex(_dom, 0, translet);
    // Pass unparsed entities to translet
    translet.setUnparsedEntityURIs(_dtdMonitor.
                 getUnparsedEntityURIs());
    // Do the actual transformation
    translet.transform(_dom, tohFactory.getTransletOutputHandler());

    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());
      return sout.toString();
  }
  catch (RuntimeException e) {
      out.close();
      return sout.toString();
  }
  catch (Exception e) {
      out.println("<h1>exception</h1>");
      out.println(e.toString());
      out.close();
      return sout.toString();
  }
    }
}
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