001/*
002 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
003 * 
004 * This software is open source. 
005 * See the bottom of this file for the licence.
006 * 
007 * $Id: DefaultNamespace.java,v 1.9 2001/08/01 09:17:21 jstrachan Exp $
008 */
009
010package org.dom4j.tree;
011
012import org.dom4j.Element;
013import org.dom4j.Node;
014import org.dom4j.Namespace;
015
016/** <p><code>DefaultNamespace</code> implements a doubly linked node which 
017  * supports the parent relationship and is mutable.
018  * It is useful when returning results from XPath expressions.</p>
019  *
020  * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
021  * @version $Revision: 1.9 $
022  */
023public class DefaultNamespace extends Namespace {
024
025    /** The parent of this node */
026    private Element parent;
027
028    /** @param prefix is the prefix for this namespace
029      * @param uri is the URI for this namespace
030      */
031    public DefaultNamespace(String prefix,String uri) {
032        super( prefix, uri );
033    }
034
035    /** @param parent is the parent element
036      * @param prefix is the prefix for this namespace
037      * @param uri is the URI for this namespace
038      */
039    public DefaultNamespace(Element parent,String prefix,String uri) {
040        super( prefix, uri );
041        this.parent = parent;
042    }
043    
044    /** @return the hash code based on the qualified name and the URI of the 
045      * namespace and the hashCode() of the parent element.
046      */
047    protected int createHashCode() {        
048        int hashCode = super.createHashCode();
049        if ( parent != null ) {
050            hashCode ^= parent.hashCode();
051        }
052        return hashCode;
053    }
054
055    /** Implements an identity based comparsion using the parent element as well as
056     * the prefix and URI
057     */
058    public boolean equals(Object object) {
059        if ( object instanceof DefaultNamespace ) {
060            DefaultNamespace that = (DefaultNamespace) object;
061            if ( that.parent == parent ) {
062                return super.equals( object );
063            }
064        }
065        return false;
066    }
067
068    
069    public Element getParent() {
070        return parent;
071    }
072
073    public void setParent(Element parent) {
074        this.parent = parent;
075    }
076    
077    public boolean supportsParent() {
078        return true;
079    }
080}
081
082
083
084
085/*
086 * Redistribution and use of this software and associated documentation
087 * ("Software"), with or without modification, are permitted provided
088 * that the following conditions are met:
089 *
090 * 1. Redistributions of source code must retain copyright
091 *    statements and notices.  Redistributions must also contain a
092 *    copy of this document.
093 *
094 * 2. Redistributions in binary form must reproduce the
095 *    above copyright notice, this list of conditions and the
096 *    following disclaimer in the documentation and/or other
097 *    materials provided with the distribution.
098 *
099 * 3. The name "DOM4J" must not be used to endorse or promote
100 *    products derived from this Software without prior written
101 *    permission of MetaStuff, Ltd.  For written permission,
102 *    please contact dom4j-info@metastuff.com.
103 *
104 * 4. Products derived from this Software may not be called "DOM4J"
105 *    nor may "DOM4J" appear in their names without prior written
106 *    permission of MetaStuff, Ltd. DOM4J is a registered
107 *    trademark of MetaStuff, Ltd.
108 *
109 * 5. Due credit should be given to the DOM4J Project
110 *    (http://dom4j.org/).
111 *
112 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
113 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
114 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
115 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
116 * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
117 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
118 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
119 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
120 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
121 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
122 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
123 * OF THE POSSIBILITY OF SUCH DAMAGE.
124 *
125 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
126 *
127 * $Id: DefaultNamespace.java,v 1.9 2001/08/01 09:17:21 jstrachan Exp $
128 */