find All Elements By Tag Name in XML Element - Android XML

Android examples for XML:XML Element

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Description

find All Elements By Tag Name in XML Element

Demo Code

/**/*from  w  ww. j av  a2s.c  om*/
 * 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
 */
//package com.java2s;
import java.util.LinkedList;
import java.util.List;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class Main {
    /**
     * @param elem
     * @param tagName
     * @return
     */
    public static List<Element> findAllElementsByTagName(Element elem,
            String tagName) {
        List<Element> ret = new LinkedList<Element>();
        findAllElementsByTagName(elem, tagName, ret);
        return ret;
    }

    /**
     * @param el
     * @param tagName
     * @param elementList
     */
    private static void findAllElementsByTagName(Element el,
            String tagName, List<Element> elementList) {

        if (tagName.equals(el.getTagName())) {
            elementList.add(el);
        }
        Element elem = getFirstElement(el);
        while (elem != null) {
            findAllElementsByTagName(elem, tagName, elementList);
            elem = getNextElement(elem);
        }
    }

    /**
     * @param parent
     * @return
     */
    public static Element getFirstElement(Node parent) {
        Node n = parent.getFirstChild();
        while (n != null && Node.ELEMENT_NODE != n.getNodeType()) {
            n = n.getNextSibling();
        }
        if (n == null) {
            return null;
        }
        return (Element) n;
    }

    /**
     * @param el
     * @return
     */
    public static Element getNextElement(Element el) {
        Node nd = el.getNextSibling();
        while (nd != null) {
            if (nd.getNodeType() == Node.ELEMENT_NODE) {
                return (Element) nd;
            }
            nd = nd.getNextSibling();
        }
        return null;
    }
}

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