package jdk.jfr.internal.util;

import java.util.Random;

public class UniversalHashFamily {

    final Random rand = new Random();

    private static long getA(long hashFunction) {

        return hashFunction | 1;

    }

    private static long getB(long hashFunction, long mask) {

        return hashFunction & mask;

    }

    private static long getHash(long key, long hashFunction, long mask) {

        return (getA(hashFunction) * key) + (hashFunction & mask);

    }

    public static int getIndex(long key, long hashFunction, long shift, long mask) {

        return (int)(getHash(key, hashFunction, mask) >>> shift);

    }

    public long getRandomHashFunction() {

        return rand.nextLong() & Long.MAX_VALUE;

    }

}