1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. 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 */
17 package org.apache.commons.collections4.iterators;
18
19 /**
20 * Provides an implementation of an empty map iterator.
21 *
22 * @param <K> the type of keys
23 * @param <V> the type of mapped values
24 * @since 4.0
25 */
26 public abstract class AbstractEmptyMapIterator<K, V> extends AbstractEmptyIterator<K> {
27
28 /**
29 * Create a new AbstractEmptyMapIterator.
30 */
31 public AbstractEmptyMapIterator() {
32 }
33
34 /**
35 * Always throws IllegalStateException.
36 *
37 * @return Always throws IllegalStateException.
38 * @throws IllegalStateException Always thrown.
39 */
40 public K getKey() {
41 throw new IllegalStateException("Iterator contains no elements");
42 }
43
44 /**
45 * Always throws IllegalStateException.
46 *
47 * @return Always throws IllegalStateException.
48 * @throws IllegalStateException Always thrown.
49 */
50 public V getValue() {
51 throw new IllegalStateException("Iterator contains no elements");
52 }
53
54 /**
55 * Always throws IllegalStateException.
56 *
57 * @param ignored ignored.
58 * @return Always throws IllegalStateException.
59 * @throws IllegalStateException Always thrown.
60 */
61 public V setValue(final V ignored) {
62 throw new IllegalStateException("Iterator contains no elements");
63 }
64
65 }