Gets the value for the child XML Element with the indicated name. - Java XML

Java examples for XML:XML Element Value

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Description

Gets the value for the child XML Element with the indicated name.

Demo Code

/*/*w w  w .j av  a 2s  .c o m*/
 *  Copyright 2006-2015 WebPKI.org (http://webpki.org).
 *
 *  Licensed 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.java2s;

import org.w3c.dom.Node;
import org.w3c.dom.Element;

public class Main {
    /**
     * Gets the value for the child Element with the indicated name. The child
     * searched for must exist one level below the parent, i.e. a real 
     * parent-child relation.
     * 
     * @param parent Parent Element to start search from.
     * @param name Name to search for in child.
     * @return The value for the child Element with the indicated name, or null
     * if the Element could not be found.
     */
    public static String getChildElementValue(Element parent, String name) {
        Element elem;

        if ((elem = firstChildElement(parent)) == null) {
            return null;
        }

        /* Check first child. */
        if (elem.getNodeName().equals(name)) {
            return elem.getFirstChild().getNodeValue();
        }

        /* Loop the rest. */
        while ((elem = nextSiblingElement(elem)) != null) {
            if (elem.getNodeName().equals(name)) {
                return elem.getFirstChild().getNodeValue();
            }
        }

        return null;
    }

    /**
     * Get the first child {@link org.w3c.dom.Element Element} of an {@link org.w3c.dom.Element Element}.
     * <p>{@link org.w3c.dom.Node Nodes} other than {@link org.w3c.dom.Element Elements} are ignored.
     * @param parent Parent
     * @return The first child {@link org.w3c.dom.Element Element} or null if none exists.
     */
    public static Element firstChildElement(Element parent) {
        Node n = parent.getFirstChild();

        if (n == null || n instanceof Element) {
            return (Element) n;
        } else {
            return nextSiblingElement(n);
        }
    }

    /**
     * Get the next sibling {@link org.w3c.dom.Element Element} of a {@link org.w3c.dom.Node Node}.
     * <p>{@link org.w3c.dom.Node Nodes} other than {@link org.w3c.dom.Element Elements} are ignored.
     * @param n Node
     * @return The first child {@link org.w3c.dom.Element Element} or null if none exists.
     */
    public static Element nextSiblingElement(Node n) {
        do {
            if ((n = n.getNextSibling()) == null) {
                return null;
            }
        } while (!(n instanceof Element));

        return (Element) n;
    }
}

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