Lucene.Net.Util.OpenBitSet.FastFlip C# (CSharp) Method

		public virtual void  FastFlip(int index)
		{
			int wordNum = index >> 6; // div 64
			int bit = index & 0x3f; // mod 64
			long bitmask = 1L << bit;
			internalbits[wordNum] ^= bitmask;
		}
		

        public virtual OpenBitSet BitSet(FacetDataCache dataCache)
        {
            int[] index = facetValueConverter.Convert(dataCache, vals);

            OpenBitSet bitset = new OpenBitSet(dataCache.ValArray.Count);
            foreach (int i in index)
            {
                bitset.FastSet(i);
            }
            if (takeCompliment)
            {
                // flip the bits
                for (int i = 0; i < index.Length; ++i)
                {
                    bitset.FastFlip(i);
                }
            }
            return bitset;
        }