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Java > Open Source Codes > org > dom4j > tree > DefaultNamespace


1 /*
2  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
3  *
4  * This software is open source.
5  * See the bottom of this file for the licence.
6  */
7
8 package org.dom4j.tree;
9
10 import org.dom4j.Element;
11 import org.dom4j.Namespace;
12
13 /**
14  * <p>
15  * <code>DefaultNamespace</code> implements a doubly linked node which
16  * supports the parent relationship and is mutable. It is useful when returning
17  * results from XPath expressions.
18  * </p>
19  *
20  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan </a>
21  * @version $Revision: 1.16 $
22  */
23 public class DefaultNamespace extends Namespace {
24     /** The parent of this node */
25     private Element parent;
26
27     /**
28      * DOCUMENT ME!
29      *
30      * @param prefix
31      * is the prefix for this namespace
32      * @param uri
33      * is the URI for this namespace
34      */
35     public DefaultNamespace(String JavaDoc prefix, String JavaDoc uri) {
36         super(prefix, uri);
37     }
38
39     /**
40      * DOCUMENT ME!
41      *
42      * @param parent
43      * is the parent element
44      * @param prefix
45      * is the prefix for this namespace
46      * @param uri
47      * is the URI for this namespace
48      */
49     public DefaultNamespace(Element parent, String JavaDoc prefix, String JavaDoc uri) {
50         super(prefix, uri);
51         this.parent = parent;
52     }
53
54     /**
55      * DOCUMENT ME!
56      *
57      * @return the hash code based on the qualified name and the URI of the
58      * namespace and the hashCode() of the parent element.
59      */
60     protected int createHashCode() {
61         int hashCode = super.createHashCode();
62
63         if (parent != null) {
64             hashCode ^= parent.hashCode();
65         }
66
67         return hashCode;
68     }
69
70     /**
71      * Implements an identity based comparsion using the parent element as well
72      * as the prefix and URI
73      *
74      * @param object
75      * DOCUMENT ME!
76      *
77      * @return DOCUMENT ME!
78      */
79     public boolean equals(Object JavaDoc object) {
80         if (object instanceof DefaultNamespace) {
81             DefaultNamespace that = (DefaultNamespace) object;
82
83             if (that.parent == parent) {
84                 return super.equals(object);
85             }
86         }
87
88         return false;
89     }
90
91     public int hashCode() {
92         return super.hashCode();
93     }
94
95     public Element getParent() {
96         return parent;
97     }
98
99     public void setParent(Element parent) {
100         this.parent = parent;
101     }
102
103     public boolean supportsParent() {
104         return true;
105     }
106     
107     public boolean isReadOnly() {
108         return false;
109     }
110 }
111
112 /*
113  * Redistribution and use of this software and associated documentation
114  * ("Software"), with or without modification, are permitted provided that the
115  * following conditions are met:
116  *
117  * 1. Redistributions of source code must retain copyright statements and
118  * notices. Redistributions must also contain a copy of this document.
119  *
120  * 2. Redistributions in binary form must reproduce the above copyright notice,
121  * this list of conditions and the following disclaimer in the documentation
122  * and/or other materials provided with the distribution.
123  *
124  * 3. The name "DOM4J" must not be used to endorse or promote products derived
125  * from this Software without prior written permission of MetaStuff, Ltd. For
126  * written permission, please contact dom4j-info@metastuff.com.
127  *
128  * 4. Products derived from this Software may not be called "DOM4J" nor may
129  * "DOM4J" appear in their names without prior written permission of MetaStuff,
130  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
131  *
132  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
133  *
134  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
135  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
136  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
137  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
138  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
139  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
140  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
141  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
142  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
143  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
144  * POSSIBILITY OF SUCH DAMAGE.
145  *
146  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
147  */
148
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