    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.MapIterator;
    020
    021/**
    022 * Provides an implementation of an empty map iterator.
    023 *
    024 * @param <K> the type of keys
    025 * @param <V> the type of mapped values
    026 * @since 3.1
    027 */
    028public class EmptyMapIterator<K, V> extends AbstractEmptyMapIterator<K, V> implements
    029        MapIterator<K, V> {
    030
    031    /**
    032     * Singleton instance of the iterator.
    033     * @since 3.1
    034     */
    035    @SuppressWarnings("rawtypes")
    036    public static final MapIterator INSTANCE = new EmptyMapIterator<>();
    037
    038    /**
    039     * Gets a typed instance of the iterator.
    040     * @param <K> the key type
    041     * @param <V> the value type
    042     * @return {@link MapIterator}&lt;K, V&gt;
    043     */
    044    public static <K, V> MapIterator<K, V> emptyMapIterator() {
    045        return INSTANCE;
    046    }
    047
    048    /**
    049     * Constructs a new instance.
    050     */
    051    protected EmptyMapIterator() {
    052    }
    053
    054}