get Element by namespace - Java XML

Java examples for XML:DOM Element

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Description

get Element by namespace

Demo Code

/*//w  ww  .java  2s .co  m
 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
//package com.java2s;

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

public class Main {
    public static Element getElement(Element e, String nsUri,
            String localName) {
        NodeList l = e.getChildNodes();
        for (int i = 0; i < l.getLength(); i++) {
            Node n = l.item(i);
            if (n.getNodeType() == Node.ELEMENT_NODE) {
                Element r = (Element) n;
                if (equals(r.getLocalName(), localName)
                        && equals(fixNull(r.getNamespaceURI()), nsUri))
                    return r;
            }
        }
        return null;
    }

    public static Element getElement(Element e, String localName) {
        return getElement(e, "", localName);
    }

    /**
     * Used for defensive string comparisons, as many DOM methods often return null
     * depending on how they are created.
     */
    private static boolean equals(String a, String b) {
        if (a == b)
            return true;
        if (a == null || b == null)
            return false;
        return a.equals(b);
    }

    /**
     * DOM API returns null for the default namespace whereas it should return "".
     */
    private static String fixNull(String s) {
        if (s == null)
            return "";
        else
            return s;
    }
}

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