1 /**
2 * Copyright 2005-2012 The Kuali Foundation
3 *
4 * Licensed under the Educational Community License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.opensource.org/licenses/ecl2.php
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.kuali.rice.ken.util;
17
18 import java.util.ArrayList;
19 import java.util.Iterator;
20 import java.util.List;
21
22 import javax.xml.namespace.NamespaceContext;
23
24 /**
25 * XPath NamespaceContext implementation that delegates in sequence to a list of NamespaceContexts,
26 * returning the first match.
27 * @author Kuali Rice Team (rice.collab@kuali.org)
28 */
29 public class CompoundNamespaceContext implements NamespaceContext {
30 private final List<NamespaceContext> contexts;
31
32 /**
33 * Constructs a CompoundNamespaceContext.java.
34 * @param first
35 * @param second
36 */
37 public CompoundNamespaceContext(NamespaceContext first, NamespaceContext second) {
38 this.contexts = new ArrayList<NamespaceContext>(2);
39 this.contexts.add(first);
40 this.contexts.add(second);
41 }
42
43 /**
44 * Constructs a CompoundNamespaceContext.java.
45 * @param contexts
46 */
47 public CompoundNamespaceContext(List<NamespaceContext> contexts) {
48 this.contexts = contexts;
49 }
50
51 /**
52 * @see javax.xml.namespace.NamespaceContext#getNamespaceURI(java.lang.String)
53 */
54 public String getNamespaceURI(String prefix) {
55 if (prefix == null) {
56 throw new IllegalArgumentException("The prefix cannot be null.");
57 }
58 for (NamespaceContext nc: contexts) {
59 String uri = nc.getNamespaceURI(prefix);
60 if (uri != null) {
61 return uri;
62 }
63 }
64 return null;
65 }
66
67 /**
68 * @see javax.xml.namespace.NamespaceContext#getPrefix(java.lang.String)
69 */
70 public String getPrefix(String namespaceURI) {
71 if (namespaceURI == null) {
72 throw new IllegalArgumentException("The namespace uri cannot be null.");
73 }
74 for (NamespaceContext nc: contexts) {
75 String prefix = nc.getPrefix(namespaceURI);
76 if (prefix != null) {
77 return prefix;
78 }
79 }
80 return null;
81 }
82
83 /**
84 * @see javax.xml.namespace.NamespaceContext#getPrefixes(java.lang.String)
85 */
86 public Iterator getPrefixes(String namespaceURI) {
87 if (namespaceURI == null) {
88 throw new IllegalArgumentException("The namespace uri cannot be null.");
89 }
90 for (NamespaceContext nc: contexts) {
91 Iterator prefixes = nc.getPrefixes(namespaceURI);
92 if (prefixes != null) {
93 return prefixes;
94 }
95 }
96 return null;
97 }
98 }