/**

     * Returns a power of two table size for the given desired capacity.

     * See Hackers Delight, sec 3.2

     */

    private static final int tableSizeFor(int c) {

        int n = c - 1;

        n |= n >>> 1;

        n |= n >>> 2;

        n |= n >>> 4;

        n |= n >>> 8;

        n |= n >>> 16;

        return (n < 0) ? 1 : (n >= MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : n + 1;

    }