Method cardinality

src/main/java/net/agkn/hll/HLL.java:511–524

Computes the cardinality of the HLL. @return the cardinality of HLL. This will never be negative.

()

     * @return the cardinality of HLL. This will never be negative.
     */
    public long cardinality() {
        switch(type) {
            case EMPTY:
                return 0/*by definition*/;
            case EXPLICIT:
                return explicitStorage.size();
            case SPARSE:
                return (long)Math.ceil(sparseProbabilisticAlgorithmCardinality());
            case FULL:
                return (long)Math.ceil(fullProbabilisticAlgorithmCardinality());
            default:
                throw new RuntimeException("Unsupported HLL type " + type);
        }
    }

    // ------------------------------------------------------------------------
    // Cardinality helpers