}

  private static void checkStrength(
      MapMakerInternalMap<Object, Object, ?, ?> map, Strength keyStrength, Strength valueStrength) {
    assertThat(map.keyStrength()).isEqualTo(keyStrength);
    assertThat(map.valueStrength()).isEqualTo(valueStrength);
    assertSame(keyStrength.defaultEquivalence(), map.keyEquivalence);
    assertSame(valueStrength.defaultEquivalence(), map.valueEquivalence());
  }

  }

  @CanIgnoreReturnValue
  CacheBuilder<K, V> setKeyStrength(Strength strength) {
    checkState(keyStrength == null, "Key strength was already set to %s", keyStrength);
    keyStrength = checkNotNull(strength);
    return this;
  }

  Strength getKeyStrength() {
    return MoreObjects.firstNonNull(keyStrength, Strength.STRONG);
  }

  /**

      WEAK,
      WEAK_ACCESS,
      WEAK_WRITE,
      WEAK_ACCESS_WRITE,
    };

    static EntryFactory getFactory(
        Strength keyStrength, boolean usesAccessQueue, boolean usesWriteQueue) {
      int flags =
          ((keyStrength == Strength.WEAK) ? WEAK_MASK : 0)
              | (usesAccessQueue ? ACCESS_MASK : 0)
              | (usesWriteQueue ? WRITE_MASK : 0);
      return factories[flags];