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 17 package com.google.common.collect; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 import java.util.IdentityHashMap; 22 import java.util.Iterator; 23 import java.util.Map; 24 import java.util.Map.Entry; 25 import java.util.Set; 26 27 /** 28 * Tests for {@link HashBiMap}. 29 * 30 * @author Mike Bostock 31 */ 32 @GwtCompatible 33 public class HashBiMapTest extends AbstractBiMapTest { 34 create()35 @Override protected BiMap<Integer, String> create() { 36 return HashBiMap.create(); 37 } 38 testCreate()39 public void testCreate() { 40 BiMap<String, String> bimap = HashBiMap.create(); 41 assertEquals(0, bimap.size()); 42 bimap.put("canada", "dollar"); 43 assertEquals("dollar", bimap.get("canada")); 44 assertEquals("canada", bimap.inverse().get("dollar")); 45 } 46 testMapConstructor()47 public void testMapConstructor() { 48 /* Test with non-empty Map. */ 49 Map<String, String> map = ImmutableMap.of( 50 "canada", "dollar", 51 "chile", "peso", 52 "switzerland", "franc"); 53 HashBiMap<String, String> bimap = HashBiMap.create(map); 54 assertEquals("dollar", bimap.get("canada")); 55 assertEquals("canada", bimap.inverse().get("dollar")); 56 } 57 58 private static final int N = 1000; 59 testBashIt()60 public void testBashIt() throws Exception { 61 BiMap<Integer, Integer> bimap = HashBiMap.create(N); 62 BiMap<Integer, Integer> inverse = bimap.inverse(); 63 64 for (int i = 0; i < N; i++) { 65 assertNull(bimap.put(2 * i, 2 * i + 1)); 66 } 67 for (int i = 0; i < N; i++) { 68 assertEquals(2 * i + 1, (int) bimap.get(2 * i)); 69 } 70 for (int i = 0; i < N; i++) { 71 assertEquals(2 * i, (int) inverse.get(2 * i + 1)); 72 } 73 for (int i = 0; i < N; i++) { 74 int oldValue = bimap.get(2 * i); 75 assertEquals(2 * i + 1, (int) bimap.put(2 * i, oldValue - 2)); 76 } 77 for (int i = 0; i < N; i++) { 78 assertEquals(2 * i - 1, (int) bimap.get(2 * i)); 79 } 80 for (int i = 0; i < N; i++) { 81 assertEquals(2 * i, (int) inverse.get(2 * i - 1)); 82 } 83 Set<Entry<Integer, Integer>> entries = bimap.entrySet(); 84 for (Entry<Integer, Integer> entry : entries) { 85 entry.setValue(entry.getValue() + 2 * N); 86 } 87 for (int i = 0; i < N; i++) { 88 assertEquals(2 * N + 2 * i - 1, (int) bimap.get(2 * i)); 89 } 90 } 91 92 // The next two tests verify that map entries are not accessed after they're 93 // removed, since IdentityHashMap throws an exception when that occurs. testIdentityKeySetIteratorRemove()94 public void testIdentityKeySetIteratorRemove() { 95 bimap = new AbstractBiMap<Integer, String>( 96 new IdentityHashMap<Integer, String>(), 97 new IdentityHashMap<String, Integer>()) {}; 98 putOneTwoThree(); 99 Iterator<Integer> iterator = bimap.keySet().iterator(); 100 iterator.next(); 101 iterator.next(); 102 iterator.remove(); 103 iterator.next(); 104 iterator.remove(); 105 assertEquals(1, bimap.size()); 106 assertEquals(1, bimap.inverse().size()); 107 } 108 testIdentityEntrySetIteratorRemove()109 public void testIdentityEntrySetIteratorRemove() { 110 bimap = new AbstractBiMap<Integer, String>( 111 new IdentityHashMap<Integer, String>(), 112 new IdentityHashMap<String, Integer>()) {}; 113 putOneTwoThree(); 114 Iterator<Entry<Integer, String>> iterator = bimap.entrySet().iterator(); 115 iterator.next(); 116 iterator.next(); 117 iterator.remove(); 118 iterator.next(); 119 iterator.remove(); 120 assertEquals(1, bimap.size()); 121 assertEquals(1, bimap.inverse().size()); 122 } 123 } 124