code: private final void forceResizeCleanCache(final int lgResizeFactor) {
      assert (!dirty_); // Should never be dirty before a resize.
      lgArrLongs_ += lgResizeFactor; // new tgt size
      final long[] tgtArr = new long[1 << lgArrLongs_];
      final int newCount = HashOperations.hashArrayInsert(cache_, tgtArr, lgArrLongs_, thetaLong_);
      assert (curCount_ == newCount);
      curCount_ = newCount;
      cache_ = tgtArr;
      hashTableThreshold_ = setHashTableThreshold(lgNomLongs_, lgArrLongs_);
    }
docs: Used by rebuildDirty(), resizeClean()