1// GenericsNote: Converted. 2/* 3 * Copyright 2004 The Apache Software Foundation 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17package org.jivesoftware.smack.util.collections; 18 19import java.util.Iterator; 20 21/** 22 * Provides an implementation of an empty iterator. 23 * <p/> 24 * This class provides an implementation of an empty iterator. 25 * This class provides for binary compatability between Commons Collections 26 * 2.1.1 and 3.1 due to issues with <code>IteratorUtils</code>. 27 * 28 * @author Matt Hall, John Watkinson, Stephen Colebourne 29 * @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $ 30 * @since Commons Collections 2.1.1 and 3.1 31 */ 32public class EmptyIterator <E> extends AbstractEmptyIterator<E> implements ResettableIterator<E> { 33 34 /** 35 * Singleton instance of the iterator. 36 * 37 * @since Commons Collections 3.1 38 */ 39 public static final ResettableIterator RESETTABLE_INSTANCE = new EmptyIterator(); 40 /** 41 * Singleton instance of the iterator. 42 * 43 * @since Commons Collections 2.1.1 and 3.1 44 */ 45 public static final Iterator INSTANCE = RESETTABLE_INSTANCE; 46 47 public static <T> Iterator<T> getInstance() { 48 return INSTANCE; 49 } 50 51 /** 52 * Constructor. 53 */ 54 protected EmptyIterator() { 55 super(); 56 } 57 58} 59