FoToPdfConverter.java

/*
Name: 
    - FoToPdfConverter

Description: 
    -  

Requires:
    - 
    
Provides:
    - 

Part of: ProcessPuzzle Framework, Domain and Business Model Ready Architecture. Provides content, workflow and social networking functionality. 
http://www.processpuzzle.com

ProcessPuzzle - Content and Workflow Management Integration Business Platform

Author(s): 
    - Zsolt Zsuffa

Copyright: (C) 2011 This program is free software: you can redistribute it and/or modify it under the terms of the 
GNU General Public License as published by the Free Software Foundation, either version 3 of the License, 
or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package com.processpuzzle.application.resource.domain;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringReader;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.FormattingResults;
import org.apache.fop.apps.MimeConstants;
import org.apache.fop.apps.PageSequenceResults;

public class FoToPdfConverter {

   public static ByteArrayOutputStream convertFO2PDF( String fo ) throws IOException, FOPException {

      FopFactory fopFactory = FopFactory.newInstance();

      ByteArrayOutputStream out = null;

      try{
         FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
         out = new ByteArrayOutputStream();

         Fop fop = fopFactory.newFop( MimeConstants.MIME_PDF, foUserAgent, out );

         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer transformer = factory.newTransformer();

         Source src = new StreamSource( new StringReader( fo ) );

         Result res = new SAXResult( fop.getDefaultHandler() );

         transformer.transform( src, res );

         FormattingResults foResults = fop.getResults();
         java.util.List pageSequences = foResults.getPageSequences();
         for( java.util.Iterator it = pageSequences.iterator(); it.hasNext(); ){
            PageSequenceResults pageSequenceResults = (PageSequenceResults) it.next();
            System.out.println( "PageSequence " + (String.valueOf( pageSequenceResults.getID() ).length() > 0 ? pageSequenceResults.getID() : "<no id>")
                  + " generated " + pageSequenceResults.getPageCount() + " pages." );
         }
         System.out.println( "Generated " + foResults.getPageCount() + " pages in total." );

      }catch( Throwable e ){
         e.printStackTrace( System.err );
         System.exit( -1 );
      }finally{
         out.close();
      }
      return out;
   }

}