Java tutorial
//package com.java2s; /* * * This file is part of the XiPKI project. * Copyright (c) 2014 - 2015 Lijun Liao * Author: Lijun Liao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License version 3 * as published by the Free Software Foundation with the addition of the * following permission added to Section 15 as permitted in Section 7(a): * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY * THE AUTHOR LIJUN LIAO. LIJUN LIAO DISCLAIMS THE WARRANTY OF NON INFRINGEMENT * OF THIRD PARTY RIGHTS. * * 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License. * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial activities involving the XiPKI software without * disclosing the source code of your own applications. * * For more information, please contact Lijun Liao at this * address: lijun.liao@gmail.com */ import org.w3c.dom.Element; import org.w3c.dom.Node; public class Main { public static Element getFirstElementChild(final Element element, final String namespace, final String localname) { Node node = element.getFirstChild(); if (node == null) { return null; } do { if (match(node, namespace, localname)) { return (Element) node; } } while ((node = node.getNextSibling()) != null); return null; } private static boolean match(final Node node, final String namespace, final String localname) { if (node instanceof Element) { Element element = (Element) node; if (element.getLocalName().equals(localname)) { if (namespace == null || namespace.equals(element.getNamespaceURI())) { return true; } } } return false; } }