Java example source code file (HelperNodeList.java)

This example Java source code file (HelperNodeList.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, document, dom, helpernodelist, illegalargumentexception, list, node, nodes, parent, util

The HelperNodeList.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/**
 * 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.
 */
package com.sun.org.apache.xml.internal.security.utils;

import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * @author Christian Geuer-Pollmann
 */
public class HelperNodeList implements NodeList {

    /** Field nodes */
    List<Node> nodes = new ArrayList();
    boolean allNodesMustHaveSameParent = false;

    /**
     *
     */
    public HelperNodeList() {
        this(false);
    }


    /**
     * @param allNodesMustHaveSameParent
     */
    public HelperNodeList(boolean allNodesMustHaveSameParent) {
        this.allNodesMustHaveSameParent = allNodesMustHaveSameParent;
    }

    /**
     * Method item
     *
     * @param index
     * @return node with index i
     */
    public Node item(int index) {
        return nodes.get(index);
    }

    /**
     * Method getLength
     *
     *  @return length of the list
     */
    public int getLength() {
        return nodes.size();
    }

    /**
     * Method appendChild
     *
     * @param node
     * @throws IllegalArgumentException
     */
    public void appendChild(Node node) throws IllegalArgumentException {
        if (this.allNodesMustHaveSameParent && this.getLength() > 0
            && this.item(0).getParentNode() != node.getParentNode()) {
            throw new IllegalArgumentException("Nodes have not the same Parent");
        }
        nodes.add(node);
    }

    /**
     * @return the document that contains this nodelist
     */
    public Document getOwnerDocument() {
        if (this.getLength() == 0) {
            return null;
        }
        return XMLUtils.getOwnerDocument(this.item(0));
    }
}