Main.java Source code

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//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
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 * 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;
    }
}