1/*
2 * Copyright (C) 2013 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.MultimapBuilder.MultimapBuilderWithKeys;
22
23import junit.framework.TestCase;
24
25import java.io.ByteArrayInputStream;
26import java.io.ByteArrayOutputStream;
27import java.io.ObjectInputStream;
28import java.io.ObjectOutputStream;
29import java.math.RoundingMode;
30import java.util.SortedMap;
31import java.util.SortedSet;
32
33/**
34 * Tests for {@link MultimapBuilder}.
35 *
36 * @author Louis Wasserman
37 */
38@GwtCompatible(emulated = true)
39public class MultimapBuilderTest extends TestCase {
40
41  @GwtIncompatible("doesn't build without explicit type parameters on build() methods")
42  public void testGenerics() {
43    ListMultimap<String, Integer> a = MultimapBuilder.hashKeys().arrayListValues().build();
44    SortedSetMultimap<String, Integer> b = MultimapBuilder.linkedHashKeys().treeSetValues().build();
45    SetMultimap<String, Integer> c =
46        MultimapBuilder.treeKeys(String.CASE_INSENSITIVE_ORDER).hashSetValues().build();
47  }
48
49  public void testGenerics_gwtCompatible() {
50    ListMultimap<String, Integer> a =
51        MultimapBuilder.hashKeys().arrayListValues().<String, Integer>build();
52    SortedSetMultimap<String, Integer> b =
53        MultimapBuilder.linkedHashKeys().treeSetValues().<String, Integer>build();
54    SetMultimap<String, Integer> c = MultimapBuilder.treeKeys(String.CASE_INSENSITIVE_ORDER)
55        .hashSetValues().<String, Integer>build();
56  }
57
58  @GwtIncompatible("doesn't build without explicit type parameters on build() methods")
59  public void testTreeKeys() {
60    ListMultimap<String, Integer> multimap = MultimapBuilder.treeKeys().arrayListValues().build();
61    assertTrue(multimap.keySet() instanceof SortedSet);
62    assertTrue(multimap.asMap() instanceof SortedMap);
63  }
64
65  public void testTreeKeys_gwtCompatible() {
66    ListMultimap<String, Integer> multimap =
67        MultimapBuilder.treeKeys().arrayListValues().<String, Integer>build();
68    assertTrue(multimap.keySet() instanceof SortedSet);
69    assertTrue(multimap.asMap() instanceof SortedMap);
70  }
71
72  @GwtIncompatible("serialization")
73  public void testSerialization() throws Exception {
74    for (MultimapBuilderWithKeys<?> builderWithKeys : ImmutableList.of(
75        MultimapBuilder.hashKeys(), MultimapBuilder.linkedHashKeys(), MultimapBuilder.treeKeys(),
76        MultimapBuilder.enumKeys(RoundingMode.class))) {
77      for (MultimapBuilder<?, ?> builder : ImmutableList.of(
78          builderWithKeys.arrayListValues(),
79          builderWithKeys.linkedListValues(),
80          builderWithKeys.hashSetValues(),
81          builderWithKeys.linkedHashSetValues(),
82          builderWithKeys.treeSetValues(),
83          builderWithKeys.enumSetValues(RoundingMode.class))) {
84        /*
85         * Temporarily inlining SerializableTester here for obscure internal reasons.
86         */
87        reserializeAndAssert(builder.build());
88      }
89    }
90  }
91
92  @GwtIncompatible("serialization")
93  private static void reserializeAndAssert(Object object) throws Exception {
94    Object copy = reserialize(object);
95    assertEquals(object, copy);
96    assertEquals(object.getClass(), copy.getClass());
97  }
98
99  @GwtIncompatible("serialization")
100  private static Object reserialize(Object object) throws Exception {
101    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
102    new ObjectOutputStream(bytes).writeObject(object);
103    return new ObjectInputStream(new ByteArrayInputStream(bytes.toByteArray())).readObject();
104  }
105}
106