PrintServlet

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* $Id: FopPrintServlet.java,v 1.1.2.1 2003/01/13 16:27:14 jeremias Exp $
* Copyright (C) 2002 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/

import java.io.*; import java.util.Vector ;

import java.awt.print.PrinterJob? ; import java.awt.print.PrinterException? ;

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

import org.xml.sax.InputSource?; import org.xml.sax.XMLReader;

import org.apache.fop.apps.Driver; import org.apache.fop.layout.Page; import org.apache.fop.apps.Version; import org.apache.fop.apps.XSLTInputHandler?; import org.apache.fop.messaging.MessageHandler?;

import org.apache.fop.render.awt.AWTRenderer ;

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

/**

* Example servlet to generate a fop printout from a servlet.
* Printing goes to the default printer on host where the servlet executes.
* Servlet param is:
* <ul>
*   <li>fo: the path to a formatting object file to render
* </ul>
*
* Example URL: http://servername/fop/servlet/FopPrintServlet?fo=readme.fo
* Example URL: http://servername/fop/servlet/FopPrintServlet?xml=data.xml&xsl=format.xsl
* Compiling: you will need
* - servlet_2_2.jar
* - fop.jar
* - sax api
* - avalon-framework-x.jar (where x is the version found the FOP lib dir)
*
* Running: you will need in the WEB-INF/lib/ directory:
* - fop.jar
* - batik.jar
* - avalon-framework-x.jar (where x is the version found the FOP lib dir)
* - xalan-2.0.0.jar
*/

public class FopPrintServlet? extends HttpServlet? {

   public static final String FO_REQUEST_PARAM = "fo";
   public static final String XML_REQUEST_PARAM = "xml";
   public static final String XSL_REQUEST_PARAM = "xsl";
   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);
           String xmlParam = request.getParameter(XML_REQUEST_PARAM);
           String xslParam = request.getParameter(XSL_REQUEST_PARAM);

           if (foParam != null) {
               FileInputStream file = new FileInputStream(foParam);
               renderFO(new InputSource(file), response);
           } else if ((xmlParam != null) && (xslParam != null)) {
               XSLTInputHandler input =
                 new XSLTInputHandler(new File(xmlParam),
                                      new File(xslParam));
               renderXML(input, response);
           } else {
               response.setContentType ("text/html");

               PrintWriter out = response.getWriter();
               out.println("<html><title>Error</title>\n"+ "<body><h1>FopServlet Error</h1><h3>No 'fo' or 'xml/xsl' "+
                           "request param given.</h3></body></html>");
           }
       } catch (ServletException ex) {
           throw ex;
       }
       catch (Exception ex) {
           throw new ServletException(ex);
       }
   }

   /**
    * Renders an FO inputsource to the default printer.
    */
   public void renderFO(InputSource foFile,
                        HttpServletResponse response) throws ServletException {
       try {
           Driver driver = new Driver(foFile, null);
           PrinterJob pj = PrinterJob.getPrinterJob();
           PrintRenderer renderer = new PrintRenderer(pj);

           driver.setLogger (log);
           driver.setRenderer(renderer);
           driver.run();

           reportOK (response);
       } catch (Exception ex) {
           throw new ServletException(ex);
       }
   }

   /**
    * Renders an FO generated using an XML and a stylesheet to the default printer.
    */
   public void renderXML(XSLTInputHandler input,
                         HttpServletResponse response) throws ServletException {
       try {
           Driver driver = new Driver();
           PrinterJob pj = PrinterJob.getPrinterJob();
           PrintRenderer renderer = new PrintRenderer(pj);

           pj.setCopies(1);

           driver.setLogger (log);
           driver.setRenderer (renderer);
           driver.render (input.getParser(), input.getInputSource());

           reportOK (response);
       } catch (Exception ex) {
           throw new ServletException(ex);
       }
   }

   // private helper, tell (browser) user that file printed
   private void reportOK (HttpServletResponse response)
   throws ServletException {
       String sMsg =
         "<html><title>Success</title>\n" + "<body><h1>FopPrintServlet: </h1>" +
         "<h3>The requested data was printed</h3></body></html>" ;

       response.setContentType ("text/html");
       response.setContentLength (sMsg.length());

       try {
           PrintWriter out = response.getWriter();
           out.println (sMsg);
           out.flush();
       } catch (Exception ex) {
           throw new ServletException(ex);
       }
   }

   // This is stolen from PrintStarter
   class PrintRenderer extends AWTRenderer {

       private static final int EVEN_AND_ALL = 0;
       private static final int EVEN = 1;
       private static final int ODD = 2;

       private int startNumber;
       private int endNumber;
       private int mode = EVEN_AND_ALL;
       private int copies = 1;
       private PrinterJob printerJob;

       PrintRenderer(PrinterJob printerJob) {
           super(null);

           this.printerJob = printerJob;
           startNumber = 0 ;
           endNumber = -1;

           printerJob.setPageable(this);

           mode = EVEN_AND_ALL;
           String str = System.getProperty("even");
           if (str != null) {
               try {
                   mode = Boolean.valueOf(str).booleanValue() ? EVEN : ODD;
               } catch (Exception e) {}

           }
       }

       public void stopRenderer(OutputStream outputStream)
       throws IOException {
           super.stopRenderer(outputStream);

           if (endNumber == -1)
               endNumber = getPageCount();

           Vector numbers = getInvalidPageNumbers();
           for (int i = numbers.size() - 1; i > -1; i--)
               removePage(
                 Integer.parseInt((String) numbers.elementAt(i)));

           try {
               printerJob.print();
           } catch (PrinterException e) {
               e.printStackTrace();
               throw new IOException("Unable to print: " +
                                     e.getClass().getName() + ": " + e.getMessage());
           }
       }

       public void renderPage(Page page) {
           pageWidth = (int)((float) page.getWidth() / 1000f);
           pageHeight = (int)((float) page.getHeight() / 1000f);
           super.renderPage(page);
       }

       private Vector getInvalidPageNumbers() {

           Vector vec = new Vector();
           int max = getPageCount();
           boolean isValid;
           for (int i = 0; i < max; i++) {
               isValid = true;
               if (i < startNumber || i > endNumber) {
                   isValid = false;
               } else if (mode != EVEN_AND_ALL) {
                   if (mode == EVEN && ((i + 1) % 2 != 0))
                       isValid = false;
                   else if (mode == ODD && ((i + 1) % 2 != 1))
                       isValid = false;
               }

               if (!isValid)
                   vec.add(i + "");
           }

           return vec;
       }
   } // class PrintRenderer

}

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