/*
* @(#)$Id$
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 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.io.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
import org.apache.xalan.xsltc.*;
import org.apache.xalan.xsltc.runtime.*;
import org.apache.xalan.xsltc.dom.*;
/**
* 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;
/**
* 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();
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
final DTDMonitor 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);
// Initialise the translet's output handler
DefaultSAXOutputHandler saxHandler =
new DefaultSAXOutputHandler(out);
TextOutput textOutput = new TextOutput(saxHandler);
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, textOutput);
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();
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();
}
}
}