converter.java

jBpm是一个灵活可扩展的工作流管理系统。作为jBpm运行时server输入的业务流程使用简单强大的语言表达并打包在流程档案中

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.jpdl.convert;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.io.DocumentResult;
import org.dom4j.io.DocumentSource;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.jbpm.jpdl.par.ProcessArchive;

public class Converter {

  private static final String STYLESHEET_NAME = "convert-pdl-2.0-to-3.0.xslt";
  
  File indir;
  File outdir;
  
  public Document convert(Document document)
	   throws Exception {

    // load the transformer using JAXP
    TransformerFactory factory = TransformerFactory.newInstance();
    Transformer transformer = factory.newTransformer( 
        new StreamSource( this.getClass().getResourceAsStream( STYLESHEET_NAME ) ) );

    // apply the conversion stylesheet to the incoming process definition
    DocumentSource source = new DocumentSource( document );
    DocumentResult result = new DocumentResult();
    transformer.transform( source, result );

    // return the transformed document
     
    return result.getDocument();
  }
  
  public String convertPar(ProcessArchive pa) {
	  
	  try
	  { 		
		// Parse the process definition XML into a DOM document
		Document doc = 
		  DocumentHelper.parseText( 
			new String( pa.getEntry("processdefinition.xml") ) );
		
		// Convert from 2.0 to 3.0 PDL
		Document doc30 = convert(doc);
		
		// Serialize the resulting document as the result
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		serializetoXML( bos, doc30) ;
		
		return bos.toString();
		
	  }
	  catch(DocumentException de)
	  {
		  log.error("Conversion had trouble parsing the 2.0 process definition", de);
	  }
	  catch(Exception ex)
	  {
		  log.error("Unexpected error in conversion", ex);
	  }
	  
	  return null; // things did not go well
  }
  
  public void serializetoXML(OutputStream out, Document document) 
       throws Exception {
	  
     OutputFormat outformat = OutputFormat.createPrettyPrint();
     //outformat.setEncoding(aEncodingScheme);
     XMLWriter writer = new XMLWriter(out, outformat);
     writer.write( document );
     writer.flush();
  }
  
  public static void main(String[] args)
            throws Exception
  {
    
	 Converter converter = new Converter();
	 
	 if (!converter.parse(args)){	 
       System.err.println();
       System.err.println("Usage: java -jar converter.jar input-directory output-directory\n\n" +
       		              "input-directory is the directory where you have 2.0 process archives (*.par)\n" +
						  "The converted process files will be placed in the output-directory");       
       System.exit(1);
     }


	 converter.convertPars();
   
  }
  
  boolean parse(String[] args){
  	
  	if (args.length != 2)
  	  return false;
  	
	// Check for valid input and output directories
	indir = new File( args[0] );
	if (!indir.isDirectory())
	{
	  System.err.println("Input file " + args[0] + " is not a valid directory name.");
	  return false;
	}
	 	 
	outdir = new File( args[1] );
	if (!outdir.isDirectory())
	{
		System.err.println("Output file " + args[1] + " is not a valid directory name.");
		return false;
	}
	 
  	return true;  	
  }
  
  void convertPars() throws Exception {
  	
  	String[] files = indir.list( new FilenameFilter() {
  									public boolean accept(File dir, String name){
  										return name.toLowerCase().endsWith(".par");
  									}  
       							  });

	for (int i = 0; i < files.length; i++)
	{
		ZipInputStream zip = new ZipInputStream( 
								new FileInputStream( 
										indir.getPath() + "/" + files[i]));
									
		ProcessArchive pa = new ProcessArchive(zip);
		
		String xml = convertPar( pa );
		
		// Create new process archive in designated output directory
		ZipOutputStream zippo = new ZipOutputStream(
								  new FileOutputStream(
								  			outdir.getPath() + "/" + files[i] ));
		
		// Copy all non-pdl entries and insert new pdl
		
		for (Iterator iter = pa.getEntries().keySet().iterator(); iter.hasNext(); )
		{
		  String name = (String) iter.next();
		  
		  zippo.putNextEntry( new ZipEntry( name ) );
		  if ("processdefinition.xml".equalsIgnoreCase(name))
		  {
		    zippo.write( xml.getBytes( ) );
		  }
		  else
		  {
		    zippo.write( pa.getEntry(name) );
		  }
		  
		  zippo.closeEntry();
		}
		
		zippo.close();
		
		System.out.println("Converted " + files[i]);
		
	  }  // process next PAR
  }
  
  private static final Log log = LogFactory.getLog(Converter.class);
}