Java tutorial
//package com.java2s; /* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved. * * Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common * Development and Distribution License("CDDL") (collectively, 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.netbeans.org/cddl-gplv2.html * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the * specific language governing permissions and limitations under the * License. When distributing the software, include this License Header * Notice in each file and include the License file at * nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the GPL Version 2 section of the License file that * accompanied this code. If applicable, add the following below the * License Header, with the fields enclosed by brackets [] replaced by * your own identifying information: * "Portions Copyrighted [year] [name of copyright owner]" * * Contributor(s): * * The Original Software is NetBeans. The Initial Developer of the Original * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun * Microsystems, Inc. All Rights Reserved. * * If you wish your version of this file to be governed by only the CDDL * or only the GPL Version 2, indicate your decision by adding * "[Contributor] elects to include this software in this distribution * under the [CDDL or GPL Version 2] license." If you do not indicate a * single choice of license, a recipient has the option to distribute * your version of this file under either the CDDL, the GPL Version 2 or * to extend the choice of license to its licensees as provided above. * However, if you add GPL Version 2 code and therefore, elected the GPL * Version 2 license, then the option applies only if the new code is * made subject to such option by the copyright holder. */ import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; public class Main { /** * Search for an XML element in the direct children of parent only. * * This compares localName (nodeName if localName is null) to name, and * checks the tags namespace with the provided namespace. A * <code>null</code> namespace will match any namespace. * <p> * This is differs from the DOM version by: * <ul> * <li>not searching recursively</li> * <li>returns a single result</li> * </ul> * * @param parent a parent element * @param name the intended local name * @param namespace the intended namespace (or null) * @return the one child element with that name, or null if none * @throws IllegalArgumentException if there is multiple elements of the * same name * * @since 8.4 */ public static Element findElement(Element parent, String name, String namespace) throws IllegalArgumentException { Element result = null; NodeList l = parent.getChildNodes(); int nodeCount = l.getLength(); for (int i = 0; i < nodeCount; i++) { if (l.item(i).getNodeType() == Node.ELEMENT_NODE) { Node node = l.item(i); String localName = node.getLocalName(); localName = localName == null ? node.getNodeName() : localName; if (name.equals(localName) && (namespace == null || namespace.equals(node.getNamespaceURI()))) { if (result == null) { result = (Element) node; } else { throw new IllegalArgumentException("more than one element with same name found"); } } } } return result; } }