java.fedora.localservices.fop.FOPServlet Maven / Gradle / Ivy

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The Fedora Client is a Java Library that allows API access to a Fedora Repository. The client is typically one part of a full Fedora installation.
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/*
 * -----------------------------------------------------------------------------
 *
 * License and Copyright: The contents of this file are subject to the
 * Apache License, Version 2.0 (the "License"); you may not use 
 * this file except in compliance with the License. You may obtain a copy of 
 * the License at 
 * http://www.fedora-commons.org/licenses.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * The entire file consists of original code.
 * Copyright © 2008 Fedora Commons, Inc.

 * 
Copyright © 2002-2007 The Rector and Visitors of the University of 
 * Virginia and Cornell University
 
 * All rights reserved.
 *
 * -----------------------------------------------------------------------------
 */
package fedora.localservices.fop;

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

import org.xml.sax.InputSource;

import org.apache.fop.apps.Driver;
import org.apache.fop.messaging.MessageHandler;

import org.apache.avalon.framework.logger.ConsoleLogger;
import org.apache.avalon.framework.logger.Logger;

/**
 *
 * Title: FOPServlet.java
 * Description: Servlet for generating and serving a PDF, given the
 * URL to an XSL-FO file.
 * Servlet param is:
 * 
 *   source: the path to a formatting object file to render
 * 
 *
 * @author [email protected]
 * @version $Id: FOPServlet.java 5162 2006-10-25 00:49:06Z eddie $
 */
public class FOPServlet extends HttpServlet {
	
	private static final long serialVersionUID = 1L;

    public static final String FO_REQUEST_PARAM = "source";
    Logger log = null;

    public void doGet(HttpServletRequest request,
                      HttpServletResponse response) throws ServletException {
        if (log == null) {
            log = new ConsoleLogger(ConsoleLogger.LEVEL_WARN);
            MessageHandler.setScreenLogger(log);
        }
        try {
            String foParam = request.getParameter(FO_REQUEST_PARAM);

            if (foParam != null) {
                renderFO(new InputSource(foParam), response);
            } else {
                PrintWriter out = response.getWriter();
                out.println("Error\n"+
                            "FOPServlet ErrorNo 'source' "+
                            "request param given.");
            }
        } catch (ServletException ex) {
            throw ex;
        }
        catch (Exception ex) {
            throw new ServletException(ex);
        }
    }

    public void renderFO(InputSource foFile,
                         HttpServletResponse response) throws ServletException {
        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();

            response.setContentType("application/pdf");

            Driver driver = new Driver(foFile, out);
            driver.setLogger(log);
            driver.setRenderer(Driver.RENDER_PDF);
            driver.run();

            byte[] content = out.toByteArray();
            response.setContentLength(content.length);
            response.getOutputStream().write(content);
            response.getOutputStream().flush();
        } catch (Exception ex) {
            throw new ServletException(ex);
        }
    }

}