1/*
2 * Copyright (C) 2007 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 com.google.common.annotations.GwtCompatible;
20import com.google.common.annotations.GwtIncompatible;
21import com.google.common.collect.testing.features.CollectionFeature;
22import com.google.common.collect.testing.features.CollectionSize;
23import com.google.common.collect.testing.features.MapFeature;
24import com.google.common.collect.testing.google.BiMapTestSuiteBuilder;
25import com.google.common.collect.testing.google.TestStringBiMapGenerator;
26
27import junit.framework.Test;
28import junit.framework.TestCase;
29import junit.framework.TestSuite;
30
31import java.util.Iterator;
32import java.util.Map;
33import java.util.Map.Entry;
34import java.util.Set;
35
36/**
37 * Tests for {@link HashBiMap}.
38 *
39 * @author Mike Bostock
40 */
41@GwtCompatible(emulated = true)
42public class HashBiMapTest extends TestCase {
43
44  public static final class HashBiMapGenerator extends TestStringBiMapGenerator {
45    @Override
46    protected BiMap<String, String> create(Entry<String, String>[] entries) {
47      BiMap<String, String> result = HashBiMap.create();
48      for (Entry<String, String> entry : entries) {
49        result.put(entry.getKey(), entry.getValue());
50      }
51      return result;
52    }
53  }
54
55  @GwtIncompatible("suite")
56  public static Test suite() {
57    TestSuite suite = new TestSuite();
58    suite.addTest(BiMapTestSuiteBuilder.using(new HashBiMapGenerator())
59      .named("HashBiMap")
60      .withFeatures(CollectionSize.ANY,
61          CollectionFeature.SERIALIZABLE,
62          CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
63          MapFeature.ALLOWS_NULL_KEYS,
64          MapFeature.ALLOWS_NULL_VALUES,
65          MapFeature.ALLOWS_ANY_NULL_QUERIES,
66          MapFeature.GENERAL_PURPOSE)
67      .createTestSuite());
68    suite.addTestSuite(HashBiMapTest.class);
69    return suite;
70  }
71
72  public void testMapConstructor() {
73    /* Test with non-empty Map. */
74    Map<String, String> map = ImmutableMap.of(
75        "canada", "dollar",
76        "chile", "peso",
77        "switzerland", "franc");
78    HashBiMap<String, String> bimap = HashBiMap.create(map);
79    assertEquals("dollar", bimap.get("canada"));
80    assertEquals("canada", bimap.inverse().get("dollar"));
81  }
82
83  private static final int N = 1000;
84
85  public void testBashIt() throws Exception {
86    BiMap<Integer, Integer> bimap = HashBiMap.create(N);
87    BiMap<Integer, Integer> inverse = bimap.inverse();
88
89    for (int i = 0; i < N; i++) {
90      assertNull(bimap.put(2 * i, 2 * i + 1));
91    }
92    for (int i = 0; i < N; i++) {
93      assertEquals(2 * i + 1, (int) bimap.get(2 * i));
94    }
95    for (int i = 0; i < N; i++) {
96      assertEquals(2 * i, (int) inverse.get(2 * i + 1));
97    }
98    for (int i = 0; i < N; i++) {
99      int oldValue = bimap.get(2 * i);
100      assertEquals(2 * i + 1, (int) bimap.put(2 * i, oldValue - 2));
101    }
102    for (int i = 0; i < N; i++) {
103      assertEquals(2 * i - 1, (int) bimap.get(2 * i));
104    }
105    for (int i = 0; i < N; i++) {
106      assertEquals(2 * i, (int) inverse.get(2 * i - 1));
107    }
108    Set<Entry<Integer, Integer>> entries = bimap.entrySet();
109    for (Entry<Integer, Integer> entry : entries) {
110      entry.setValue(entry.getValue() + 2 * N);
111    }
112    for (int i = 0; i < N; i++) {
113      assertEquals(2 * N + 2 * i - 1, (int) bimap.get(2 * i));
114    }
115  }
116
117  public void testBiMapEntrySetIteratorRemove() {
118    BiMap<Integer, String> map = HashBiMap.create();
119    map.put(1, "one");
120    Set<Map.Entry<Integer, String>> entries = map.entrySet();
121    Iterator<Map.Entry<Integer, String>> iterator = entries.iterator();
122    Map.Entry<Integer, String> entry = iterator.next();
123    entry.setValue("two"); // changes the iterator's current entry value
124    assertEquals("two", map.get(1));
125    assertEquals(Integer.valueOf(1), map.inverse().get("two"));
126    iterator.remove(); // removes the updated entry
127    assertTrue(map.isEmpty());
128  }
129}
130