Utils.java Source code

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Here is the source code for Utils.java

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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 java.util.List;

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";

    /**
     * Get all prefixes defined, up to the root, for a namespace URI.
     * 
     * @param element
     * @param namespaceUri
     * @param prefixes
     */
    public static void getPrefixesRecursive(Element element, String namespaceUri, List<String> prefixes) {
        getPrefixes(element, namespaceUri, prefixes);
        Node parent = element.getParentNode();
        if (parent instanceof Element) {
            getPrefixesRecursive((Element) parent, namespaceUri, prefixes);
        }
    }

    /**
     * Get all prefixes defined on this element for the specified namespace.
     * 
     * @param element
     * @param namespaceUri
     * @param prefixes
     */
    public static void getPrefixes(Element element, String namespaceUri, List<String> prefixes) {
        NamedNodeMap atts = element.getAttributes();
        for (int i = 0; i < atts.getLength(); i++) {
            Node node = atts.item(i);
            String name = node.getNodeName();
            if (namespaceUri.equals(node.getNodeValue())
                    && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
                prefixes.add(node.getPrefix());
            }
        }
    }
}