@SuppressWarnings("unchecked")
    CacheBuilder<K1, V1> me = (CacheBuilder<K1, V1>) this;
    me.weigher = checkNotNull(weigher);
    return me;
  }

  long getMaximumWeight() {
    if (expireAfterWriteNanos == 0 || expireAfterAccessNanos == 0) {
      return 0;
    }
    return (weigher == null) ? maximumSize : maximumWeight;
  }