Java XML Element Children clear(Element node, String subElement)

Description

clear

License

Open Source License

Declaration

public static Element clear(Element node, String subElement) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (C) 2006-2013 AITIA International, Inc.
 * //from ww w  . jav a  2 s  .  co m
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

public class Main {
    public static Element clear(Element node, String subElement) {
        Element child = findFirst(node, subElement);
        if (child == null) {
            child = node.getOwnerDocument().createElement(subElement);
            node.appendChild(child);
        }
        child.setTextContent(null); // remove all descendants
        return child;
    }

    /** Returns the first 'subElement' of 'node'. */
    public static Element findFirst(Element node, String subElement) {
        Element ans = null;
        if (node != null) {
            NodeList nl = node.getElementsByTagName(subElement);
            if (nl != null && nl.getLength() > 0)
                ans = (Element) nl.item(0);
        }
        return ans;
    }
}

Related

1. findAll(Element node, String subElement)
2. getFirstSubElement(Element element)
3. getImmediateSubElements(Element element, String name)
4. getRelationUri(Element subject, Element object, String defaultBaseUri)