NSAwareElement.java

/*
 * 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.
 */

package org.apache.axiom.om.impl.dom;

import org.apache.axiom.dom.DOMConfigurationImpl;
import org.apache.axiom.dom.DOMNSAwareElement;
import org.apache.axiom.om.OMConstants;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.impl.intf.AxiomElement;

/** Implementation of the org.w3c.dom.Element and org.apache.axiom.om.Element interfaces. */
public class NSAwareElement extends ElementImpl implements DOMNSAwareElement, AxiomElement,
        OMConstants {
    
    /**
     * Returns the namespace uri, given the prefix. If it is not found at this element, searches the
     * parent.
     *
     * @param prefix
     * @return Returns namespace.
     */
    public String getNamespaceURI(String prefix) {
        OMNamespace ns = this.findNamespaceURI(prefix);
        return (ns != null) ? ns.getNamespaceURI() : null;
    }

    public void normalize(DOMConfigurationImpl config) {
        if (config.isEnabled(DOMConfigurationImpl.NAMESPACES)) {
            OMNamespace namespace = getNamespace();
            if (namespace == null) {
                if (getDefaultNamespace() != null) {
                    declareDefaultNamespace("");
                }
            } else {
                OMNamespace namespaceForPrefix = findNamespaceURI(namespace.getPrefix());
                if (namespaceForPrefix == null || !namespaceForPrefix.getNamespaceURI().equals(namespace.getNamespaceURI())) {
                    declareNamespace(namespace);
                }
            }
        }
        super.normalize(config);
    }
}