/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow;import com.opensymphony.workflow.loader.*;import org.w3c.dom.Document;import org.w3c.dom.Element;import java.io.File;import java.io.FileInputStream;import java.net.URL;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;/** * User: Hani Suleiman (hani@formicary.net) * Date: Feb 12, 2003 * Time: 6:49:46 PM */public class DescriptorLoader {    //~ Methods ////////////////////////////////////////////////////////////////    public static WorkflowDescriptor getDescriptor(String url) throws Exception {        File file = new File(new URL(url).getFile());        if (!file.exists()) {            throw new IllegalArgumentException("file " + file + " does not exist");        }        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();        dbf.setNamespaceAware(true);        dbf.setValidating(true);        DocumentBuilder db = dbf.newDocumentBuilder();        db.setEntityResolver(new DTDEntityResolver());        db.setErrorHandler(new WorkflowLoader.WorkflowErrorHandler(new URL(url)));        Document doc = db.parse(new FileInputStream(file));        Element root = (Element) doc.getElementsByTagName("workflow").item(0);        WorkflowDescriptor descriptor = DescriptorFactory.getFactory().createWorkflowDescriptor(root);        return descriptor;    }}