/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999-2003 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) 1999, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
Simple Servlet Example using a stylesheet parameter
 */
package servlet;
// Imported TraX classes
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;

// Imported SAX classes
import org.xml.sax.SAXException;

// Imported java.io and javax.servlet classes
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class UseStylesheetParamServlet extends HttpServlet {
	

   /**
    * String representing the file separator characters for the System.
    */
    public final static String FS = System.getProperty("file.separator");
    
	PrintWriter out;
	String xslFile, xmlFile, paramValue;
	public void doGet(HttpServletRequest req,
		HttpServletResponse res)
			throws ServletException, IOException {
		try {
			res.setContentType("text/html; charset=UTF-8");
			out = res.getWriter();

      paramValue = req.getParameter("PVAL");
			xmlFile    = req.getParameter("XML");
			xslFile    = req.getParameter("XSL");
 		if (paramValue == null) {
			out.println(
			"<h1>No input for paramValue</h1>");
			return;
		}
 		if ( xmlFile == null) {
			out.println(
			"<h1>No input for xmlFile</h1>");
			return;
		}	
		if ( xslFile == null) {
			out.println(
			"<h1>No input for xslFile</h1>");
			return;
		}
        
        // get the real path for xml and xsl files;
        String ctx = getServletContext().getRealPath("") + FS;
        xslFile = ctx + xslFile;
        xmlFile = ctx + xmlFile;
         
		TransformerFactory tFactory =
			TransformerFactory.newInstance();
		Transformer transformer =
			tFactory.newTransformer(new StreamSource(xslFile));

    // Set the stylesheet parameter (named param1).
			transformer.setParameter("param1", paramValue);
    // Perform the transformation.
			transformer.transform(new StreamSource(xmlFile),
					                  new StreamResult(out));
		}		
    catch (IOException e) {			
			e.printStackTrace();
			System.exit(-1);
		}
		catch (TransformerException e) {
      e.printStackTrace(out);
			return;
		}
	}
}