zkoss/zk

/* EmptyNamedNodeMap.java


    Purpose: 
    Description: 
    History:
    2001/09/28 11:39:53, Create, Tom M. Yeh.

Copyright (C) 2001 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
    This program is distributed under LGPL Version 2.1 in the hope that
    it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.idom.impl;

import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

import org.zkoss.idom.DOMException;

/**
 * An empty NamedNodeMap.
 *
 * @author tomyeh
 */
public class EmptyNamedNodeMap implements NamedNodeMap {
    /** The ONLY instance of EmptyNamedNodeMap.
     */
    public static final NamedNodeMap THE = new EmptyNamedNodeMap();

    protected EmptyNamedNodeMap() {
    }
    
    public int getLength() {
        return 0;
    }
    public Node getNamedItem(String name) {
        return null;
    }
    public Node getNamedItemNS(String namespaceURI, String localName) {
        return null;
    }
    public Node item(int index) {
        return null;
    }
    public Node removeNamedItem(String name) {
        throw new DOMException(DOMException.NOT_FOUND_ERR);
    }
    public Node removeNamedItemNS(String namespaceURI, String localName) {
        throw new DOMException(DOMException.NOT_FOUND_ERR);
    }
    public Node setNamedItem(Node arg) {
        throw new DOMException(DOMException.INVALID_ACCESS_ERR);
    }
    public Node setNamedItemNS(Node arg) {
        throw new DOMException(DOMException.INVALID_ACCESS_ERR);
    }
}