/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed 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.xmlbeans.impl.marshal;

import org.apache.xmlbeans.impl.marshal.util.collections.EmptyIterator;

import javax.xml.namespace.NamespaceContext;
import java.util.Iterator;

final class EmptyNamespaceContext
    implements NamespaceContext
{
    private static final NamespaceContext INSTANCE =
        new EmptyNamespaceContext();

    public static NamespaceContext getInstance()
    {
        return INSTANCE;
    }

    private EmptyNamespaceContext()
    {
    }

    public String getNamespaceURI(String s)
    {
        return null;
    }

    public String getPrefix(String s)
    {
        return null;
    }

    public Iterator getPrefixes(String s)
    {
        return EmptyIterator.getInstance();
    }

}