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Java > Open Source Codes > org > apache > commons > jxpath > ri > model > dom > NamespacePointer


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
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.apache.commons.jxpath.ri.model.dom;
17
18 import org.apache.commons.jxpath.ri.Compiler;
19 import org.apache.commons.jxpath.ri.QName;
20 import org.apache.commons.jxpath.ri.compiler.NodeTest;
21 import org.apache.commons.jxpath.ri.compiler.NodeTypeTest;
22 import org.apache.commons.jxpath.ri.model.NodePointer;
23
24 /**
25  * Represents a namespace node.
26  *
27  * @author Dmitri Plotnikov
28  * @version $Revision: 1.13 $ $Date: 2004/04/01 02:55:32 $
29  */
30 public class NamespacePointer extends NodePointer {
31     private String JavaDoc prefix;
32     private String JavaDoc namespaceURI;
33
34     public NamespacePointer(NodePointer parent, String JavaDoc prefix) {
35         super(parent);
36         this.prefix = prefix;
37     }
38
39     public NamespacePointer(
40         NodePointer parent,
41         String JavaDoc prefix,
42         String JavaDoc namespaceURI)
43     {
44         super(parent);
45         this.prefix = prefix;
46         this.namespaceURI = namespaceURI;
47     }
48
49     public QName getName() {
50         return new QName(prefix);
51     }
52
53     public Object JavaDoc getBaseValue() {
54         return null;
55     }
56     
57     public boolean isCollection() {
58         return false;
59     }
60     
61     public int getLength() {
62         return 1;
63     }
64
65     public Object JavaDoc getImmediateNode() {
66         return getNamespaceURI();
67     }
68
69     public String JavaDoc getNamespaceURI() {
70         if (namespaceURI == null) {
71             namespaceURI = parent.getNamespaceURI(prefix);
72         }
73         return namespaceURI;
74     }
75
76     public boolean isLeaf() {
77         return true;
78     }
79
80     /**
81      * Throws UnsupportedOperationException.
82      */
83     public void setValue(Object JavaDoc value) {
84         throw new UnsupportedOperationException JavaDoc("Cannot modify DOM trees");
85     }
86
87     public boolean testNode(NodeTest nodeTest) {
88         return nodeTest == null
89             || ((nodeTest instanceof NodeTypeTest)
90                 && ((NodeTypeTest) nodeTest).getNodeType()
91                     == Compiler.NODE_TYPE_NODE);
92     }
93
94     public String JavaDoc asPath() {
95         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
96         if (parent != null) {
97             buffer.append(parent.asPath());
98             if (buffer.length() == 0
99                 || buffer.charAt(buffer.length() - 1) != '/') {
100                 buffer.append('/');
101             }
102         }
103         buffer.append("namespace::");
104         buffer.append(prefix);
105         return buffer.toString();
106     }
107
108     public int hashCode() {
109         return prefix.hashCode();
110     }
111
112     public boolean equals(Object JavaDoc object) {
113         if (object == this) {
114             return true;
115         }
116
117         if (!(object instanceof NamespacePointer)) {
118             return false;
119         }
120
121         NamespacePointer other = (NamespacePointer) object;
122         return prefix.equals(other.prefix);
123     }
124
125     public int compareChildNodePointers(
126         NodePointer pointer1,
127         NodePointer pointer2)
128     {
129         // Won't happen - namespaces don't have children
130 return 0;
131     }
132  }
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