Java XML Child Element Text getChildElementsTextSet(Element parentElement, String tagName)

Declaration

public static Set<String> getChildElementsTextSet(Element parentElement, String tagName) 

Method Source Code

//package com.java2s;
/*/*from w  ww .  j  av  a  2s .  c  om*/
 * CDDL HEADER START
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License). You may not use this file except in
 * compliance with the License.
 *
 * You can obtain a copy of the License at
 * http://www.sun.com/cddl/cddl.html and legal/CDDLv1.0.txt
 * See the License for the specific language governing
 * permission and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at legal/CDDLv1.0.txt.
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * Copyright 2009 Sun Microsystems Inc. All Rights Reserved
 * CDDL HEADER END
 */

import java.util.ArrayList;
import java.util.Collections;

import java.util.HashSet;
import java.util.List;

import java.util.Set;

import org.w3c.dom.Element;

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

public class Main {
    /**
     * Returns a Set of text content of all descendant Elements with a given tag name
     * Null is returned if there is no child element with given tag name
     *
     * @param parentElement Parent Element node
     * @param tagName child Element name
     * @return List<String> containing text content
     */
    public static Set<String> getChildElementsTextSet(Element parentElement, String tagName) {
        List<Element> childElements = getChildElements(parentElement, tagName);
        if (childElements != null && childElements.size() > 0) {
            Set<String> textList = new HashSet<String>(childElements.size());
            for (Element element : childElements) {
                textList.add(element.getTextContent().trim());
            }
            return textList;
        }
        return Collections.EMPTY_SET;
    }

    protected static List<Element> getChildElements(Element element, String tagName) {
        List<Element> elements = getElementList(element);
        int numElements = elements.size();
        List<Element> childElements = new ArrayList<Element>(numElements);
        for (int i = 0; i < numElements; i++) {
            Element childElement = (Element) elements.get(i);
            if (tagName != null) {
                String childTagName = childElement.getTagName();
                if (!childTagName.equals(tagName)) {
                    continue;
                }
            }
            childElements.add(childElement);
        }
        return childElements;
    }

    protected static List<Element> getElementList(Element element) {
        if (element == null) {
            return Collections.emptyList();
        }

        NodeList childNodes = element.getChildNodes();
        int numChildren = childNodes.getLength();

        List<Element> elementList = new ArrayList<Element>(numChildren);

        for (int i = 0; i < numChildren; i++) {
            Node childNode = childNodes.item(i);
            if (childNode.getNodeType() != Node.ELEMENT_NODE) {
                continue;
            }
            elementList.add((Element) childNode);
        }

        return elementList;
    }
}

Related

1. getChildElementText(Element element, String name)
2. GetChildElementText(Element element, String name, String defaultValue)
3. getChildElementText(Element elm, String name, String defaultValue)
4. getChildElementText(Element elm, String name, String defaultValue)