    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 *      https://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
    019/**
    020 * Provides an implementation of an empty map iterator.
    021 *
    022 * @param <K> The type of keys.
    023 * @param <V> The type of mapped values.
    024 * @since 4.0
    025 */
    026public abstract class AbstractEmptyMapIterator<K, V> extends AbstractEmptyIterator<K> {
    027
    028    /**
    029     * Constructs a new AbstractEmptyMapIterator.
    030     */
    031    public AbstractEmptyMapIterator() {
    032    }
    033
    034    /**
    035     * Always throws IllegalStateException.
    036     *
    037     * @return Always throws IllegalStateException.
    038     * @throws IllegalStateException Always thrown.
    039     */
    040    public K getKey() {
    041        throw new IllegalStateException("Iterator contains no elements");
    042    }
    043
    044    /**
    045     * Always throws IllegalStateException.
    046     *
    047     * @return Always throws IllegalStateException.
    048     * @throws IllegalStateException Always thrown.
    049     */
    050    public V getValue() {
    051        throw new IllegalStateException("Iterator contains no elements");
    052    }
    053
    054    /**
    055     * Always throws IllegalStateException.
    056     *
    057     * @param ignored ignored.
    058     * @return Always throws IllegalStateException.
    059     * @throws IllegalStateException Always thrown.
    060     */
    061    public V setValue(final V ignored) {
    062        throw new IllegalStateException("Iterator contains no elements");
    063    }
    064
    065}