| /* |
| * @(#)$Id$ |
| * |
| * 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 |
| * |
| */ |
| |
| import java.io.*; |
| import java.util.NoSuchElementException; |
| import java.util.StringTokenizer; |
| import java.util.Vector; |
| |
| import org.xml.sax.*; |
| |
| import org.apache.xalan.xsltc.*; |
| import org.apache.xalan.xsltc.runtime.*; |
| import org.apache.xalan.xsltc.dom.*; |
| |
| import sunlabs.brazil.server.Handler; |
| import sunlabs.brazil.server.Request; |
| import sunlabs.brazil.server.Server; |
| |
| /** |
| * This Brazil handler demonstrates how XSL transformations can be made |
| * available as a web service without using a full web server. This class |
| * implements the Handler interface from the Brazil project, see: |
| * http://www.sun.com/research/brazil/ |
| * |
| * 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 class TransformHandler implements Handler { |
| |
| // A cache for internal DOM structures |
| private static DocumentCache cache = null; |
| |
| // These two are used while parsing the parameters in the URL |
| private final String PARAM_TRANSLET = "translet="; |
| private final String PARAM_DOCUMENT = "document="; |
| private final String PARAM_STATS = "stats="; |
| |
| // All output goes here: |
| private PrintWriter _out = null; |
| |
| /** |
| * Dump an error message to output |
| */ |
| public void errorMessage(String message, Exception e) { |
| if (_out == null) return; |
| _out.println("<h1>XSL transformation error</h1>"+message); |
| _out.println("<br>Exception:</br>"+e.toString()); |
| } |
| |
| public void errorMessage(String message) { |
| if (_out == null) return; |
| _out.println("<h1>XSL transformation error</h1>"+message); |
| } |
| |
| /** |
| * This method is run when the Brazil proxy is loaded |
| */ |
| public boolean init(Server server, String prefix) { |
| return true; |
| } |
| |
| /** |
| * This method is run for every HTTP request sent to the proxy |
| */ |
| public boolean respond(Request request) throws IOException { |
| |
| // Initialise the output buffer |
| final StringWriter sout = new StringWriter(); |
| _out = new PrintWriter(sout); |
| |
| // These two hold the parameters from the URL 'translet' and 'document' |
| String transletName = null; |
| String document = null; |
| String stats = null; |
| |
| // Get the parameters from the URL |
| final StringTokenizer params = new StringTokenizer(request.query,"&"); |
| while (params.hasMoreElements()) { |
| final String param = params.nextToken(); |
| if (param.startsWith(PARAM_TRANSLET)) { |
| transletName = param.substring(PARAM_TRANSLET.length()); |
| } |
| else if (param.startsWith(PARAM_DOCUMENT)) { |
| document = param.substring(PARAM_DOCUMENT.length()); |
| } |
| else if (param.startsWith(PARAM_STATS)) { |
| stats = param.substring(PARAM_STATS.length()); |
| } |
| } |
| |
| try { |
| // Initialize the document cache with 32 DOM slots |
| if (cache == null) cache = new DocumentCache(32); |
| |
| // Output statistics if user looked up "server:port/?stats=xxx" |
| if (stats != null) { |
| cache.getStatistics(_out); // get cache statistics (in HTML) |
| } |
| // Make sure that both parameters were specified |
| else if ((transletName == null) || (document == null)) { |
| errorMessage("Parameters <b><tt>translet</tt></b> and/or "+ |
| "<b><tt>document</tt></b> not specified."); |
| } |
| else { |
| // Get a reference to the translet class |
| Class transletClass = Class.forName(transletName); |
| // Instanciate the translet object (inherits AbstractTranslet) |
| AbstractTranslet translet = |
| (AbstractTranslet)transletClass.newInstance(); |
| translet.setDOMCache(cache); |
| |
| // Get the DOM from the DOM cache |
| DOMImpl dom = cache.retrieveDocument(document, 0, translet); |
| |
| if (dom == null) { |
| errorMessage("Could not locate: \"<b>"+document+"\"</b>"); |
| } |
| else { |
| // Initialise the translet's output handler |
| DefaultSAXOutputHandler saxHandler = |
| new DefaultSAXOutputHandler(_out); |
| |
| // Do the actual transformation |
| final long start = System.currentTimeMillis(); |
| translet.transform(dom, new TextOutput(saxHandler)); |
| final long done = System.currentTimeMillis() - start; |
| _out.println("<!-- transformed by XSLTC in "+done+"ms -->"); |
| } |
| } |
| } |
| catch (SAXException e) { |
| errorMessage("Error parsing document \""+document+"\""); |
| } |
| catch (ClassNotFoundException e) { |
| errorMessage("Could not locate the translet class: \""+ |
| transletName+"\"<br>Exception:</br>",e); |
| } |
| catch (Exception e) { |
| errorMessage("Internal error.",e); |
| } |
| |
| // Pass the transformation output as the HTTP response |
| request.sendResponse(sout.toString()); |
| return true; |
| } |
| |
| |
| } |