Gets the given element's first child DOM element with the specified name. - Java XML

Java examples for XML:XML Element Child

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Description

Gets the given element's first child DOM element with the specified name.

Demo Code

/*//from ww w  . j  ava 2 s.c  om
 * ome.xml.DOMUtil
 *
 *-----------------------------------------------------------------------------
 *
 *  Copyright (C) 2007-2008 Open Microscopy Environment
 *      Massachusetts Institute of Technology,
 *      National Institutes of Health,
 *      University of Dundee,
 *      University of Wisconsin-Madison
 *
 *
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *-----------------------------------------------------------------------------
 */
//package com.java2s;

import org.w3c.dom.*;

public class Main {
    /**
     * Gets the given element's first child DOM element with the specified name.
     */
    public static Element getChildElement(String name, Element el) {
        if (name == null || el == null)
            return null;
        NodeList list = el.getChildNodes();
        int size = list.getLength();
        for (int i = 0; i < size; i++) {
            Node node = list.item(i);
            if (!(node instanceof Element))
                continue;
            if (name.equals(getName(node)))
                return (Element) node;
        }
        return null;
    }

    /**
     * Gets the given element's index-th child DOM element with the specified
     * name, or the index-th child element overall if name is null.
     */
    public static Element getChildElement(String name, Element el, int index) {
        if (el == null)
            return null;
        NodeList list = el.getChildNodes();
        int size = list.getLength();
        String cName = ":" + name;
        int q = 0;
        for (int i = 0; i < size; i++) {
            Node node = list.item(i);
            if (!(node instanceof Element))
                continue;
            String nodeName = node.getNodeName();
            if (name == null || nodeName.equals(name)
                    || nodeName.endsWith(cName)) {
                if (q == index)
                    return (Element) node;
                q++;
            }
        }
        return null;
    }

    /** Gets the local (sans namespace) name of the given node. */
    public static String getName(Node node) {
        // NB: The node.getLocalName() method does not work.
        String name = node.getNodeName();
        int colon = name.lastIndexOf(":");
        return colon < 0 ? name : name.substring(colon + 1);
    }
}

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