/*
* Copyright 2013 MovingBlocks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terasology.utilities.random;
import org.terasology.module.sandbox.API;
import ec.util.MersenneTwisterFast;
/**
* Random number generator based on the Mersenne Primer Twister implementation of Sean Luke.
* The MersenneTwister code is based on standard MT19937 C/C++ code by Takuji Nishimura.<br/><br/>
* Reference: Makato Matsumoto and Takuji Nishimura: <br/>
* "Mersenne Twister: A 623-Dimensionally Equidistributed Uniform Pseudo-Random Number Generator"
*
* @author Martin Steiger
*/
@API
public class MersenneRandom extends Random {
private final MersenneTwisterFast mersenne;
/**
* Initializes a new instance of the random number generator using a
* specified seed.
*
* @param seed The seed to use
*/
public MersenneRandom(long seed) {
mersenne = new MersenneTwisterFast(seed);
}
/**
* Initializes a new instance of the random number generator using
* "System.currentTimeMillis()" as seed.
*/
public MersenneRandom() {
mersenne = new MersenneTwisterFast();
}
/**
* Constructor using an array of integers as seed. Your array must have a
* non-zero length. Only the first 624 integers in the array are used; if
* the array is shorter than this then integers are repeatedly used in a
* wrap-around fashion.
* @param array the seed value
*/
public MersenneRandom(int[] array) {
mersenne = new MersenneTwisterFast(array);
}
@Override
public int nextInt() {
return mersenne.nextInt();
}
@Override
public int nextInt(int max) {
return mersenne.nextInt(max);
}
@Override
public long nextLong() {
return mersenne.nextLong();
}
@Override
public long nextLong(long max) {
return mersenne.nextLong(max);
}
@Override
public float nextFloat() {
return mersenne.nextFloat();
}
@Override
public double nextDouble() {
return mersenne.nextDouble();
}
@Override
public boolean nextBoolean() {
return mersenne.nextBoolean();
}
@Override
public double nextGaussian() {
return mersenne.nextGaussian();
}
}