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1
5 package com.opensymphony.workflow.loader;
6
7 import com.opensymphony.workflow.InvalidWorkflowDescriptorException;
8
9 import org.w3c.dom.Document  ;
10 import org.w3c.dom.Element ;
11
12 import org.xml.sax.*;
13
14 import java.io.*;
15
16 import java.net.URL ;
17
18 import java.util.ArrayList ;
19 import java.util.List ;
20
21 import javax.xml.parsers.*;
22
23
24
31 public class WorkflowLoader {
32
34 public static WorkflowDescriptor load(final InputStream is) throws SAXException, IOException, InvalidWorkflowDescriptorException {
35 return load(is, null);
36 }
37
38
41 public static WorkflowDescriptor load(final URL url) throws SAXException, IOException, InvalidWorkflowDescriptorException {
42 return load(url.openStream(), url);
43 }
44
45 private static WorkflowDescriptor load(InputStream is, URL url) throws SAXException, IOException, InvalidWorkflowDescriptorException {
46 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
47 dbf.setNamespaceAware(true);
48 dbf.setValidating(true);
49
50 DocumentBuilder db;
51
52 try {
53 db = dbf.newDocumentBuilder();
54 db.setEntityResolver(new DTDEntityResolver());
55 } catch (ParserConfigurationException e) {
56 throw new SAXException("Error creating document builder", e);
57 }
58
59 db.setErrorHandler(new WorkflowErrorHandler(url));
60
61 Document doc = db.parse(is);
62
63 Element root = (Element ) doc.getElementsByTagName("workflow").item(0);
64
65 WorkflowDescriptor descriptor = new WorkflowDescriptor(root);
66 descriptor.validate();
67
68 return descriptor;
69 }
70
71
73 public static class AllExceptionsErrorHandler implements ErrorHandler {
74 private final List exceptions = new ArrayList ();
75
76 public List getExceptions() {
77 return exceptions;
78 }
79
80 public void error(SAXParseException exception) {
81 addMessage(exception);
82 }
83
84 public void fatalError(SAXParseException exception) {
85 addMessage(exception);
86 }
87
88 public void warning(SAXParseException exception) {
89 }
90
91 private void addMessage(SAXParseException exception) {
92 exceptions.add(exception.getMessage() + " (line:" + exception.getLineNumber() + ((exception.getColumnNumber() > -1) ? (" col:" + exception.getColumnNumber()) : "") + ")");
93 }
94 }
95
96 public static class WorkflowErrorHandler implements ErrorHandler {
97 private URL url;
98
99 public WorkflowErrorHandler(final URL url) {
100 this.url = url;
101 }
102
103 public void error(SAXParseException exception) throws SAXException {
104 throw new SAXException(getMessage(exception));
105 }
106
107 public void fatalError(SAXParseException exception) throws SAXException {
108 throw new SAXException(getMessage(exception));
109 }
110
111 public void warning(SAXParseException exception) throws SAXException {
112 }
113
114 private String getMessage(SAXParseException exception) {
115 return exception.getMessage() + " (" + ((url != null) ? (" url=" + url + " ") : "") + "line:" + exception.getLineNumber() + ((exception.getColumnNumber() > -1) ? (" col:" + exception.getColumnNumber()) : "") + ")";
116 }
117 }
118 }
119 |
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