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16 package org.apache.neethi;
17
18 import java.util.HashMap;
19 import java.util.Iterator;
20
21 import javax.xml.namespace.QName;
22
23 import org.apache.axiom.om.OMElement;
24 import org.apache.neethi.builders.AssertionBuilder;
25 import org.apache.neethi.builders.xml.XMLPrimitiveAssertionBuilder;
26
27 import sun.misc.Service;
28
29 /**
30 * AssertionFactory is used to create an Assertion from an OMElement. It uses an
31 * appropriate AssertionBuilder instace to create an Assertion based on the
32 * QName of the given OMElement. Domain Policy authors could right custom
33 * AssertionBuilders to build Assertions for domain specific assertions.
34 *
35 */
36 public class AssertionBuilderFactory {
37
38 public static final String POLICY_NAMESPACE = "http://schemas.xmlsoap.org/ws/2004/09/policy";
39
40 public static final String POLICY = "Policy";
41
42 public static final String EXACTLY_ONE = "ExactlyOne";
43
44 public static final String ALL = "All";
45
46 private static final QName XML_ASSERTION_BUILDER = new QName(
47 "http://test.org/test", "test");
48
49 private static HashMap registeredBuilders = new HashMap();
50
51 static {
52 AssertionBuilder builder;
53
54 for (Iterator providers = Service.providers(AssertionBuilder.class); providers
55 .hasNext();) {
56 builder = (AssertionBuilder) providers.next();
57
58 QName[] knownElements = builder.getKnownElements();
59 for (int i = 0; i < knownElements.length; i++) {
60 registerBuilder(knownElements[i], builder);
61 }
62 }
63
64 registerBuilder(XML_ASSERTION_BUILDER, new XMLPrimitiveAssertionBuilder());
65 }
66
67 /**
68 * Registers an AssertionBuilder with a specified QName.
69 *
70 * @param key the QName that the AssertionBuilder understand
71 * @param builder the AssertionBuilder that can build an Assertion from
72 * OMElement of specified type
73 */
74 public static void registerBuilder(QName key, AssertionBuilder builder) {
75 registeredBuilders.put(key, builder);
76 }
77
78 public AssertionBuilderFactory() {
79 }
80
81 /**
82 * Returns an assertion that is built using the specified OMElement.
83 *
84 * @param element the element that the AssertionBuilder can use to build
85 * an Assertion.
86 * @return an Assertion that is built using the specified element.
87 */
88 public Assertion build(OMElement element) {
89
90 AssertionBuilder builder;
91
92 QName qname = element.getQName();
93 builder = (AssertionBuilder) registeredBuilders.get(qname);
94
95 if (builder != null) {
96 return builder.build(element, this);
97 }
98
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102
103 builder = (AssertionBuilder) registeredBuilders
104 .get(XML_ASSERTION_BUILDER);
105 return builder.build(element, this);
106 }
107
108 /**
109 * Returns an AssertionBuilder that build an Assertion from an OMElement
110 * of qname type.
111 *
112 * @param qname the type that the AssertionBuilder understands and builds an Assertion from
113 * @return an AssertionBuilder that understands qname type
114 */
115 public AssertionBuilder getBuilder(QName qname) {
116 return (AssertionBuilder) registeredBuilders.get(qname);
117 }
118 }