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      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 import com.google.common.annotations.GwtIncompatible;
     21 import com.google.common.collect.testing.features.CollectionFeature;
     22 import com.google.common.collect.testing.features.CollectionSize;
     23 import com.google.common.collect.testing.features.MapFeature;
     24 import com.google.common.collect.testing.google.BiMapTestSuiteBuilder;
     25 import com.google.common.collect.testing.google.TestStringBiMapGenerator;
     26 
     27 import junit.framework.Test;
     28 import junit.framework.TestCase;
     29 import junit.framework.TestSuite;
     30 
     31 import java.util.Iterator;
     32 import java.util.Map;
     33 import java.util.Map.Entry;
     34 import java.util.Set;
     35 
     36 /**
     37  * Tests for {@link HashBiMap}.
     38  *
     39  * @author Mike Bostock
     40  */
     41 @GwtCompatible(emulated = true)
     42 public 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