defaultnamespace.java

Java的面向对象数据库系统的源代码

/*
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 *
 * $Id: AbstractNamespace.java,v 1.3 2003/06/10 16:18:36 per_nyfelt Exp $
 */

package org.dom4j.tree;

import org.dom4j.Element;

/** <p><code>AbstractNamespace</code> implements a doubly linked node which
  * supports the parent relationship and is mutable.
  * It is useful when returning results from XPath expressions.</p>
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @author Per Nyfelt
  * @version $Revision: 1.3 $
  */
public class DefaultNamespace extends org.dom4j.tree.AbstractNamespace {

    /** The parent of this node */
    private Element parent;

    /** @param prefix is the prefix for this namespace
      * @param uri is the URI for this namespace
      */
    public DefaultNamespace(String prefix,String uri) {
        super( prefix, uri );
    }

    /** @param parent is the parent element
      * @param prefix is the prefix for this namespace
      * @param uri is the URI for this namespace
      */
    public DefaultNamespace(Element parent,String prefix,String uri) {
        super( prefix, uri );
        this.parent = parent;
    }

    /** @return the hash code based on the qualified name and the URI of the
      * namespace and the hashCode() of the parent element.
      */
    protected int createHashCode() {
        int hashCode = super.createHashCode();
        if ( parent != null ) {
            hashCode ^= parent.hashCode();
        }
        return hashCode;
    }

    /** Implements an identity based comparsion using the parent element as well as
     * the prefix and URI
     */
    public boolean equals(Object object) {
        if ( object instanceof DefaultNamespace ) {
            DefaultNamespace that = (DefaultNamespace) object;
            if ( that.parent == parent ) {
                return super.equals( object );
            }
        }
        return false;
    }


    public Element getParent() {
        return parent;
    }

    public void setParent(Element parent) {
        this.parent = parent;
    }

    public boolean supportsParent() {
        return true;
    }
}




/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "DOM4J" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of MetaStuff, Ltd.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "DOM4J"
 *    nor may "DOM4J" appear in their names without prior written
 *    permission of MetaStuff, Ltd. DOM4J is a registered
 *    trademark of MetaStuff, Ltd.
 *
 * 5. Due credit should be given to the DOM4J Project
 *    (http://dom4j.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * $Id: AbstractNamespace.java,v 1.3 2003/06/10 16:18:36 per_nyfelt Exp $
 */