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1
10
11 package com.triactive.jdo.util;
12
13 import java.io.IOException  ;
14 import java.io.InputStream ;
15 import java.security.AccessController ;
16 import java.security.PrivilegedAction ;
17 import javax.jdo.JDOHelper;
18 import javax.xml.parsers.DocumentBuilder ;
19 import javax.xml.parsers.DocumentBuilderFactory ;
20 import javax.xml.parsers.ParserConfigurationException ;
21 import org.xml.sax.EntityResolver ;
22 import org.xml.sax.InputSource ;
23 import org.xml.sax.SAXException ;
24
25
26
32
33 public class XMLHelper
34 {
35
41 private static final String USE_VALIDATING_XML_PARSER_PROPERTY =
42 "com.triactive.jdo.useValidatingXmlParser";
43
44
45
48 private XMLHelper() {}
49
50
51
61 public static DocumentBuilder getDocumentBuilder()
62 throws ParserConfigurationException
63 {
64 boolean validating =
65 new Boolean (System.getProperty(USE_VALIDATING_XML_PARSER_PROPERTY, "true")).booleanValue();
66
67 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
68 factory.setValidating(validating);
69
70 DocumentBuilder builder = factory.newDocumentBuilder();
71 builder.setEntityResolver(new JDOEntityResolver());
72
73 return builder;
74 }
75
76
77 private static class JDOEntityResolver implements EntityResolver
78 {
79 private static final String RECOGNIZED_PUBLIC_ID =
80 "-//Sun Microsystems, Inc.//DTD Java Data Objects Metadata 1.0//EN";
81
82 public InputSource resolveEntity(String publicId, String systemId)
83 throws SAXException , IOException
84 {
85 boolean isJdoDtd;
86
87 if (publicId == null)
88 isJdoDtd = systemId.startsWith("file:") && systemId.endsWith("/jdo.dtd");
89 else
90 isJdoDtd = RECOGNIZED_PUBLIC_ID.equals(publicId);
91
92 if (isJdoDtd)
93 {
94 InputStream stream = (InputStream )AccessController.doPrivileged(
95 new PrivilegedAction ()
96 {
97 public Object run()
98 {
99 return JDOHelper.class.getClassLoader().getResourceAsStream("javax/jdo/jdo.dtd");
100 }
101 }
102 );
103
104 return stream == null ? null : new InputSource (stream);
105 }
106 else
107 return null;
108 }
109 }
110 }
111
112
113 |
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