Utils.java Source code

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/**
 * 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
 * under the License.
 */

import javax.xml.XMLConstants;

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

/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
    private static final String XMLNAMESPACE = "xmlns";

    public static String createNamespace(Element el, String ns) {
        String p = "ns1";
        int i = 1;
        while (getPrefix(el, ns) != null) {
            p = "ns" + i;
            i++;
        }
        el.setAttribute(XMLNAMESPACE + ":" + p, ns);
        return p;
    }

    public static String getPrefix(Element el, String ns) {
        NamedNodeMap atts = el.getAttributes();
        for (int i = 0; i < atts.getLength(); i++) {
            Node node = atts.item(i);
            String name = node.getNodeName();
            if (ns.equals(node.getNodeValue())
                    && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
                return node.getPrefix();
            }
        }
        return null;
    }
}