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Java > Open Source Codes > org > apache > commons > jxpath > ri > model > beans > LangAttributePointer


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.beans;
17
18 import org.apache.commons.jxpath.ri.QName;
19 import org.apache.commons.jxpath.ri.compiler.NodeTest;
20 import org.apache.commons.jxpath.ri.model.NodePointer;
21
22 /**
23  * A Pointer that points to the "lang" attribute of a JavaBean. The value
24  * of the attribute is based on the locale supplied to it in the constructor.
25  *
26  * @author Dmitri Plotnikov
27  * @version $Revision: 1.13 $ $Date: 2004/04/01 02:55:32 $
28  */
29 public class LangAttributePointer extends NodePointer {
30     public LangAttributePointer(NodePointer parent) {
31         super(parent);
32     }
33
34     public QName getName() {
35         return new QName("xml", "lang");
36     }
37
38     public String JavaDoc getNamespaceURI() {
39         return null;
40     }
41
42     public boolean isCollection() {
43         return false;
44     }
45
46     public int getLength() {
47         return 1;
48     }
49
50     public Object JavaDoc getBaseValue() {
51         return parent.getLocale().toString().replace('_', '-');
52     }
53
54     public Object JavaDoc getImmediateNode() {
55         return getBaseValue();
56     }
57
58     public boolean isLeaf() {
59         return true;
60     }
61
62     /**
63      * Throws UnsupportedOperationException.
64      */
65     public void setValue(Object JavaDoc value) {
66         throw new UnsupportedOperationException JavaDoc(
67                 "Cannot change locale using the 'lang' attribute");
68     }
69
70     /**
71      */
72     public String JavaDoc asPath() {
73         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
74         if (parent != null) {
75             buffer.append(parent.asPath());
76             if (buffer.length() == 0
77                 || buffer.charAt(buffer.length() - 1) != '/') {
78                 buffer.append('/');
79             }
80         }
81         buffer.append("@xml:lang");
82         return buffer.toString();
83     }
84
85     public int hashCode() {
86         return 0;
87     }
88
89     public boolean equals(Object JavaDoc object) {
90         if (object == this) {
91             return true;
92         }
93
94         if (!(object instanceof LangAttributePointer)) {
95             return false;
96         }
97
98         return true;
99     }
100
101     public boolean testNode(NodeTest test) {
102         return false;
103     }
104
105     public int compareChildNodePointers(
106         NodePointer pointer1,
107         NodePointer pointer2)
108     {
109         // Won't happen - lang attributes don't have children
110 return 0;
111     }
112 }
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