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 */ 017package org.apache.commons.collections4.iterators; 018 019import org.apache.commons.collections4.OrderedMapIterator; 020import org.apache.commons.collections4.ResettableIterator; 021 022/** 023 * Provides an implementation of an empty ordered map iterator. 024 * 025 * @since 3.1 026 */ 027public class EmptyOrderedMapIterator<K, V> extends AbstractEmptyMapIterator<K, V> 028 implements OrderedMapIterator<K, V>, ResettableIterator<K> { 029 030 /** 031 * Singleton instance of the iterator. 032 * @since 3.1 033 */ 034 @SuppressWarnings("rawtypes") 035 public static final OrderedMapIterator INSTANCE = new EmptyOrderedMapIterator<>(); 036 037 /** 038 * Get a typed instance of the iterator. 039 * @param <K> the key type 040 * @param <V> the value type 041 * @return {@link OrderedMapIterator}<K, V> 042 */ 043 @SuppressWarnings("unchecked") 044 public static <K, V> OrderedMapIterator<K, V> emptyOrderedMapIterator() { 045 return INSTANCE; 046 } 047 048 /** 049 * Constructor. 050 */ 051 protected EmptyOrderedMapIterator() { 052 super(); 053 } 054 055}