001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.commons.collections.iterators;
018    
019    import java.util.ListIterator;
020    
021    import org.apache.commons.collections.ResettableListIterator;
022    
023    /** 
024     * Provides an implementation of an empty list iterator.
025     * <p>
026     * This class provides an implementation of an empty list iterator.
027     * This class provides for binary compatability between Commons Collections
028     * 2.1.1 and 3.1 due to issues with <code>IteratorUtils</code>.
029     *
030     * @since Commons Collections 2.1.1 and 3.1
031     * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
032     * 
033     * @author Stephen Colebourne
034     */
035    public class EmptyListIterator extends AbstractEmptyIterator implements ResettableListIterator {
036    
037        /**
038         * Singleton instance of the iterator.
039         * @since Commons Collections 3.1
040         */
041        public static final ResettableListIterator RESETTABLE_INSTANCE = new EmptyListIterator();
042        /**
043         * Singleton instance of the iterator.
044         * @since Commons Collections 2.1.1 and 3.1
045         */
046        public static final ListIterator INSTANCE = RESETTABLE_INSTANCE;
047    
048        /**
049         * Constructor.
050         */
051        protected EmptyListIterator() {
052            super();
053        }
054    
055    }