/*
    * Copyright (C) 2012 The Guava Authors
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.google.common.collect.testing.google;
  
  import static com.google.common.collect.testing.features.CollectionFeature.SERIALIZABLE;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.annotations.GwtIncompatible;
  import com.google.common.collect.BiMap;
  import com.google.common.collect.testing.Helpers;
  import com.google.common.collect.testing.features.CollectionFeature;
  import com.google.common.testing.SerializableTester;
  
  import java.io.Serializable;
  import java.lang.reflect.Method;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Tests for the {@code inverse} view of a BiMap.
   * 
   * <p>This assumes that {@code bimap.inverse().inverse() == bimap}, which is not technically
   * required but is fulfilled by all current implementations.
   * 
   * @author Louis Wasserman
   */
  @GwtCompatible(emulated = true)
  public class BiMapInverseTester<K, V> extends AbstractBiMapTester<K, V> {
  
    public void testInverseSame() {
      assertSame(getMap(), getMap().inverse().inverse());
    }
  
    @CollectionFeature.Require(SERIALIZABLE)
    public void testInverseSerialization() {
      BiMapPair<K, V> pair = new BiMapPair<K, V>(getMap());
      BiMapPair<K, V> copy = SerializableTester.reserialize(pair);
      assertEquals(pair.forward, copy.forward);
      assertEquals(pair.backward, copy.backward);
      assertSame(copy.backward, copy.forward.inverse());
      assertSame(copy.forward, copy.backward.inverse());
    }
  
    private static class BiMapPair<K, V> implements Serializable {
      final BiMap<K, V> forward;
      final BiMap<V, K> backward;
  
      BiMapPair(BiMap<K, V> original) {
        this.forward = original;
        this.backward = original.inverse();
      }
  
      private static final long serialVersionUID = 0;
    }
  
    /**
     * Returns {@link Method} instances for the tests that assume that the inverse will be the same
     * after serialization.
     */
    @GwtIncompatible("reflection")
    public static List<Method> getInverseSameAfterSerializingMethods() {
      return Collections.singletonList(getMethod("testInverseSerialization"));
    }
  
    @GwtIncompatible("reflection")
    private static Method getMethod(String methodName) {
      return Helpers.getMethod(BiMapInverseTester.class, methodName);
    }
  
  }