* constructed.
   */
  @Override
  public boolean containsRow(@CheckForNull Object rowKey) {
    return rowKeyToIndex.containsKey(rowKey);
  }

  @Override
  public boolean containsValue(@CheckForNull Object value) {
    for (@Nullable V[] row : array) {
      for (V element : row) {
        if (Objects.equal(value, element)) {
          return true;
        }
      }
    }

    @Override
    public int size() {
        return size;
    }

    @Override
    public boolean isEmpty() {
        return size == 0;
    }

    @Override
    public boolean containsValue(final Object value) {
        return indexOf(value) >= 0;
    }

    /**
     * 値に対するインデックスを返します。
     *
     * @param value
     *            値
     * @return 値に対するインデックス。値が含まれていない場合は{@literal -1}

    assertEquals(multimap.hashCode(), multimapView.hashCode());
    assertEquals(multimap.size(), multimapView.size());
    assertTrue(multimapView.containsKey("foo"));
    assertTrue(multimapView.containsValue(1));
    assertTrue(multimapView.containsEntry("bar", 2));
    assertEquals(singleton(1), multimapView.get("foo"));
    assertEquals(singleton(2), multimapView.get("bar"));

    return new SuccessorsFunction<Character>() {
      @Override
      public Iterable<? extends Character> successors(Character node) {
        checkArgument(
            graphMap.containsKey(node) || graphMap.containsValue(node),
            "Node %s is not an element of this graph",
            node);
        return Ordering.natural().immutableSortedCopy(graphMap.get(node));
      }
    };
  }

    return new SuccessorsFunction<Character>() {
      @Override
      public Iterable<? extends Character> successors(Character node) {
        checkArgument(
            graphMap.containsKey(node) || graphMap.containsValue(node),
            "Node %s is not an element of this graph",
            node);
        return Ordering.natural().immutableSortedCopy(graphMap.get(node));
      }
    };
  }

  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public boolean containsKey(@CheckForNull Object key) {
    return get(key) != null;
  }

  @Override
  public boolean containsValue(@CheckForNull Object value) {
    return values().contains(value);
  }

  // Overriding to mark it Nullable
  @Override
  @CheckForNull
  public abstract V get(@CheckForNull Object key);

  /**

  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public boolean containsKey(@CheckForNull Object key) {
    return get(key) != null;
  }

  @Override
  public boolean containsValue(@CheckForNull Object value) {
    return values().contains(value);
  }

  // Overriding to mark it Nullable
  @Override
  @CheckForNull
  public abstract V get(@CheckForNull Object key);

    for (Object key : lookupKeys) {
      assertTrue(cache.asMap().containsKey(key));
    }
    assertSame(extraValue, cache.asMap().get(extraKey));
    assertFalse(cache.asMap().containsValue(extraKey));
  }

  public void testBulkLoad_partial() throws ExecutionException {
    final Object extraKey = new Object();
    final Object extraValue = new Object();
    CacheLoader<Object, Object> loader =