/*
* @(#)$Id: TransformBean.java,v 1.5 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
*
*/
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
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.output.TransletOutputHandlerFactory;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
public class TransformBean implements SessionBean {
private SessionContext _context = null;
private final static String nullErrorMsg =
"<h1>XSL transformation error</h1>"+
"<p>'null' parameters sent to the XSL transformation bean's "+
"<tt>transform(String document, String translet)</tt> method.</p>";
private static final String NAMESPACE_FEATURE =
"http://xml.org/sax/features/namespaces";
/**
* Read the input document and build the internal "DOM" tree.
*/
private DOMImpl getDOM(String url, AbstractTranslet translet)
throws Exception {
// 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
DOMImpl 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);
translet.setDTDMonitor(dtdMonitor);
// Parse the input document
reader.parse(url);
return dom;
}
/**
* Generates HTML from a basic error message and an exception
*/
private void errorMsg(PrintWriter out, Exception e, String msg) {
out.println("<h1>Error</h1>");
out.println("<p>"+msg+"</p><br>");
out.println(e.toString());
}
/**
* Main bean entry point
*/
public String transform(String document, String transletName) {
// Initialise the output stream
final StringWriter sout = new StringWriter();
final PrintWriter out = new PrintWriter(sout);
try {
if ((document == null) || (transletName == null)) {
out.println(nullErrorMsg);
}
else {
// Instanciate a translet object (inherits AbstractTranslet)
Class tc = Class.forName(transletName);
AbstractTranslet translet = (AbstractTranslet)tc.newInstance();
// Read input document from the DOM cache
DOMImpl dom = getDOM(document, translet);
// Create output handler
TransletOutputHandlerFactory tohFactory =
TransletOutputHandlerFactory.newInstance();
tohFactory.setOutputType(TransletOutputHandlerFactory.STREAM);
tohFactory.setEncoding(translet._encoding);
tohFactory.setOutputMethod(translet._method);
tohFactory.setWriter(out);
// Start the transformation
final long start = System.currentTimeMillis();
translet.transform(dom, tohFactory.getTransletOutputHandler());
final long done = System.currentTimeMillis() - start;
out.println("<!-- transformed by XSLTC in "+done+"msecs -->");
}
}
catch (IOException e) {
errorMsg(out, e, "Could not locate source document: "+document);
}
catch (ClassNotFoundException e) {
errorMsg(out, e, "Could not locate the translet class: "+
transletName);
}
catch (SAXException e) {
errorMsg(out, e, "Error parsing document "+document);
}
catch (Exception e) {
errorMsg(out, e, "Impossible state reached.");
}
// Now close up the sink, and return the HTML output in the
// StringWrite object as a string.
out.close();
return sout.toString();
}
/**
*
*/
public void setSessionContext(SessionContext context) {
_context = context;
}
// General EJB entry points
public void ejbCreate() { }
public void ejbRemove() { }
public void ejbActivate() { }
public void ejbPassivate() { }
public void ejbLoad() { }
public void ejbStore() { }
}