001/*
002 * Copyright (C) 2012 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.google;
018
019import static com.google.common.collect.testing.features.CollectionFeature.SERIALIZABLE;
020
021import com.google.common.annotations.GwtCompatible;
022import com.google.common.annotations.GwtIncompatible;
023import com.google.common.collect.BiMap;
024import com.google.common.collect.testing.Helpers;
025import com.google.common.collect.testing.features.CollectionFeature;
026import com.google.common.testing.SerializableTester;
027import java.io.Serializable;
028import java.lang.reflect.Method;
029import java.util.Collections;
030import java.util.List;
031
032/**
033 * Tests for the {@code inverse} view of a BiMap.
034 *
035 * <p>This assumes that {@code bimap.inverse().inverse() == bimap}, which is not technically
036 * required but is fulfilled by all current implementations.
037 *
038 * @author Louis Wasserman
039 */
040@GwtCompatible(emulated = true)
041public class BiMapInverseTester<K, V> extends AbstractBiMapTester<K, V> {
042
043  public void testInverseSame() {
044    assertSame(getMap(), getMap().inverse().inverse());
045  }
046
047  @CollectionFeature.Require(SERIALIZABLE)
048  public void testInverseSerialization() {
049    BiMapPair<K, V> pair = new BiMapPair<>(getMap());
050    BiMapPair<K, V> copy = SerializableTester.reserialize(pair);
051    assertEquals(pair.forward, copy.forward);
052    assertEquals(pair.backward, copy.backward);
053    assertSame(copy.backward, copy.forward.inverse());
054    assertSame(copy.forward, copy.backward.inverse());
055  }
056
057  private static class BiMapPair<K, V> implements Serializable {
058    final BiMap<K, V> forward;
059    final BiMap<V, K> backward;
060
061    BiMapPair(BiMap<K, V> original) {
062      this.forward = original;
063      this.backward = original.inverse();
064    }
065
066    private static final long serialVersionUID = 0;
067  }
068
069  /**
070   * Returns {@link Method} instances for the tests that assume that the inverse will be the same
071   * after serialization.
072   */
073  @GwtIncompatible // reflection
074  public static List<Method> getInverseSameAfterSerializingMethods() {
075    return Collections.singletonList(getMethod("testInverseSerialization"));
076  }
077
078  @GwtIncompatible // reflection
079  private static Method getMethod(String methodName) {
080    return Helpers.getMethod(BiMapInverseTester.class, methodName);
081  }
082}