DescriptorLoader


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.workflow;
6   
7   import com.opensymphony.workflow.loader.DTDEntityResolver;
8   import com.opensymphony.workflow.loader.WorkflowDescriptor;
9   import com.opensymphony.workflow.loader.WorkflowLoader;
10  
11  import org.w3c.dom.Document  ;
12  import org.w3c.dom.Element  ;
13  
14  import java.io.File  ;
15  import java.io.FileInputStream  ;
16  
17  import java.net.URL  ;
18  
19  import javax.xml.parsers.DocumentBuilder  ;
20  import javax.xml.parsers.DocumentBuilderFactory  ;
21  
22  
23  /**
24   * User: Hani Suleiman (hani@formicary.net)
25   * Date: Feb 12, 2003
26   * Time: 6:49:46 PM
27   */
28  public class DescriptorLoader {
29      //~ Methods ////////////////////////////////////////////////////////////////
30  
31      public static WorkflowDescriptor getDescriptor(String   url) throws Exception   {
32          File   file = new File  (new URL  (url).getFile());
33  
34          if (!file.exists()) {
35              throw new IllegalArgumentException  ("file " + file + " does not exist");
36          }
37  
38          DocumentBuilderFactory   dbf = DocumentBuilderFactory.newInstance();
39          dbf.setNamespaceAware(true);
40          dbf.setValidating(true);
41  
42          DocumentBuilder   db = dbf.newDocumentBuilder();
43          db.setEntityResolver(new DTDEntityResolver());
44          db.setErrorHandler(new WorkflowLoader.WorkflowErrorHandler(new URL  (url)));
45  
46          Document   doc = db.parse(new FileInputStream  (file));
47          Element   root = (Element  ) doc.getElementsByTagName("workflow").item(0);
48  
49          WorkflowDescriptor descriptor = new WorkflowDescriptor(root);
50  
51          return descriptor;
52      }
53  }
54
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