1/*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import junit.framework.TestCase;
20
21import java.util.concurrent.ConcurrentHashMap;
22import java.util.concurrent.ConcurrentMap;
23
24/**
25 * Tests for {@link ForwardingConcurrentMap}.
26 *
27 * @author Jared Levy
28 */
29public class ForwardingConcurrentMapTest extends TestCase {
30
31  private static class TestMap
32      extends ForwardingConcurrentMap<String, Integer> {
33    final ConcurrentMap<String, Integer> delegate
34        = new ConcurrentHashMap<String, Integer>();
35    @Override protected ConcurrentMap<String, Integer> delegate() {
36      return delegate;
37    }
38  }
39
40  public void testPutIfAbsent() {
41    TestMap map = new TestMap();
42    map.put("foo", 1);
43    assertEquals(Integer.valueOf(1), map.putIfAbsent("foo", 2));
44    assertEquals(Integer.valueOf(1), map.get("foo"));
45    assertNull(map.putIfAbsent("bar", 3));
46    assertEquals(Integer.valueOf(3), map.get("bar"));
47  }
48
49  public void testRemove() {
50    TestMap map = new TestMap();
51    map.put("foo", 1);
52    assertFalse(map.remove("foo", 2));
53    assertFalse(map.remove("bar", 1));
54    assertEquals(Integer.valueOf(1), map.get("foo"));
55    assertTrue(map.remove("foo", 1));
56    assertTrue(map.isEmpty());
57  }
58
59  public void testReplace() {
60    TestMap map = new TestMap();
61    map.put("foo", 1);
62    assertEquals(Integer.valueOf(1), map.replace("foo", 2));
63    assertNull(map.replace("bar", 3));
64    assertEquals(Integer.valueOf(2), map.get("foo"));
65    assertFalse(map.containsKey("bar"));
66  }
67
68  public void testReplaceConditional() {
69    TestMap map = new TestMap();
70    map.put("foo", 1);
71    assertFalse(map.replace("foo", 2, 3));
72    assertFalse(map.replace("bar", 1, 2));
73    assertEquals(Integer.valueOf(1), map.get("foo"));
74    assertFalse(map.containsKey("bar"));
75    assertTrue(map.replace("foo", 1, 4));
76    assertEquals(Integer.valueOf(4), map.get("foo"));
77  }
78}
79