org.apache.xml.dtm.ref.DTMNodeListBase Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: DTMNodeListBase.java 468653 2006-10-28 07:07:05Z minchau $
 */
package org.apache.xml.dtm.ref;
import org.w3c.dom.Node;

/**
 * DTMNodeList gives us an implementation of the DOM's
 * NodeList interface wrapped around a DTM Iterator. The author
 * considers this something of an abominations, since NodeList was not
 * intended to be a general purpose "list of nodes" API and is
 * generally considered by the DOM WG to have be a mistake... but I'm
 * told that some of the XPath/XSLT folks say they must have this
 * solution.
 *
 * Please note that this is not necessarily equivlaent to a DOM
 * NodeList operating over the same document. In particular:
 * 
 *
 * If there are several Text nodes in logical succession (ie,
 * across CDATASection and EntityReference boundaries), we will return
 * only the first; the caller is responsible for stepping through
 * them.
 * (%REVIEW% Provide a convenience routine here to assist, pending
 * proposed DOM Level 3 getAdjacentText() operation?) 
 *
 * Since the whole XPath/XSLT architecture assumes that the source
 * document is not altered while we're working with it, we do not
 * promise to implement the DOM NodeList's "live view" response to
 * document mutation. 
 *
 * 
 *
 * State: In progress!!
 *
 */
public class DTMNodeListBase implements org.w3c.dom.NodeList {
    public DTMNodeListBase() {
    }

    //================================================================
    // org.w3c.dom.NodeList API follows

    /**
     * Returns the indexth item in the collection. If 
     * index is greater than or equal to the number of nodes in 
     * the list, this returns null.
     * @param index Index into the collection.
     * @return The node at the indexth position in the 
     *   NodeList, or null if that is not a valid 
     *   index.
     */
    public Node item(int index) {
        return null;
    }

    /**
     * The number of nodes in the list. The range of valid child node indices 
     * is 0 to length-1 inclusive. 
     */
    public int getLength() {
        return 0;
    }
}