/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow.loader;import org.apache.velocity.Template;import org.apache.velocity.VelocityContext;import org.apache.velocity.app.VelocityEngine;import java.io.ByteArrayOutputStream;import java.io.OutputStreamWriter;/** * DOCUMENT ME! * * @author $author$ * @version $Revision: 1.2 $ */public class WorkflowSerializer {    //~ Instance fields ////////////////////////////////////////////////////////    private VelocityEngine engine;    //~ Methods ////////////////////////////////////////////////////////////////    public byte[] generateWorkflowXML(WorkflowDescriptor wf) throws Exception {        initVelocity();        ByteArrayOutputStream baos = new ByteArrayOutputStream();        OutputStreamWriter writer = new OutputStreamWriter(baos);        Template template = engine.getTemplate("workflowtemplate.vm");        VelocityContext ctx = new VelocityContext();        ctx.put("workflow", wf);        template.merge(ctx, writer);        writer.flush();        baos.flush();        return baos.toByteArray();    }    protected void initVelocity() throws Exception {        if (engine == null) {            engine = new VelocityEngine();            engine.setProperty("resource.loader", "class");            engine.setProperty("class.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");            engine.init();        }    }}