PSRandom.java

// Copyright 2001, FreeHEP.
package org.freehep.postscript;

import java.util.Random;

/**
 * Random class with integer seed
 *
 * @author Mark Donszelmann
 * @version $Id: PSRandom.java 8958 2006-09-12 23:37:43Z duns $
 */
public class PSRandom extends Random {

    private long seed;
    private final static long multiplier = 0x5DEECE66DL;
    private final static long addend = 0xBL;
    private final static long mask = (1L << 32) - 1;

    public PSRandom() {
        this((int)System.currentTimeMillis());
    }
    
    public PSRandom(int seed) {
        setSeed(seed);
    }

    synchronized public void setSeed(int seed) {
        this.seed = (seed ^ multiplier) & mask;
    }

    synchronized protected int next(int bits) {
        seed = (seed * multiplier + addend) & mask;
        return (int)(seed >>> (32 - bits));
    }
    
    synchronized public int getSeed() {
        return (int)(seed ^ multiplier);
    }
}