this.map = checkNotNull(map);
    }

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

    @Override
    public boolean containsKey(@Nullable Object key) {
      return map.containsKey(key);
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      return map.containsValue(value);
    }

    @Override

      this.map = checkNotNull(map);
    }

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

    @Override
    public boolean containsKey(@Nullable Object key) {
      return map.containsKey(key);
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      return map.containsValue(value);
    }

    @Override

    public boolean isEmpty() {
      synchronized (mutex) {
        return delegate().isEmpty();
      }
    }

    @Override
    public boolean containsKey(@Nullable Object key) {
      synchronized (mutex) {
        return delegate().containsKey(key);
      }
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      synchronized (mutex) {

    public boolean isEmpty() {
      synchronized (mutex) {
        return delegate().isEmpty();
      }
    }

    @Override
    public boolean containsKey(@Nullable Object key) {
      synchronized (mutex) {
        return delegate().containsKey(key);
      }
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      synchronized (mutex) {

    for (Object key : lookupKeys) {
      assertThat(cache.asMap().containsKey(key)).isTrue();
    }
    assertThat(cache.asMap().get(extraKey)).isSameInstanceAs(extraValue);
    assertThat(cache.asMap().containsKey(extraValue)).isFalse();
  }

  public void testBulkLoad_clobberNullKey() throws ExecutionException {
    Object extraKey = new Object();

    for (Object key : lookupKeys) {
      assertThat(cache.asMap().containsKey(key)).isTrue();
    }
    assertThat(cache.asMap().get(extraKey)).isSameInstanceAs(extraValue);
    assertThat(cache.asMap().containsKey(extraValue)).isFalse();
  }

  public void testBulkLoad_clobberNullKey() throws ExecutionException {
    Object extraKey = new Object();

    }
    int hash = hash(key);
    return segmentFor(hash).getEntry(key, hash);
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    if (key == null) {
      return false;
    }
    int hash = hash(key);
    return segmentFor(hash).containsKey(key, hash);
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    if (value == null) {

    }
    int hash = hash(key);
    return segmentFor(hash).getEntry(key, hash);
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    if (key == null) {
      return false;
    }
    int hash = hash(key);
    return segmentFor(hash).containsKey(key, hash);
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    if (value == null) {

   * access. Access time is reset by all cache read and write operations (including {@code
   * Cache.asMap().get(Object)} and {@code Cache.asMap().put(K, V)}), but not by {@code
   * containsKey(Object)}, nor by operations on the collection-views of {@link Cache#asMap}}. So,
   * for example, iterating through {@code Cache.asMap().entrySet()} does not reset access time for
   * the entries you retrieve.
   *

   * access. Access time is reset by all cache read and write operations (including {@code
   * Cache.asMap().get(Object)} and {@code Cache.asMap().put(K, V)}), but not by {@code
   * containsKey(Object)}, nor by operations on the collection-views of {@link Cache#asMap}}. So,
   * for example, iterating through {@code Cache.asMap().entrySet()} does not reset access time for
   * the entries you retrieve.
   *