1 /*
2 * $Id: PredictableRandomGenerator.java,v 1.1 2005/09/26 18:23:20 weiju Exp $
3 *
4 * Created on 2005/09/23
5 * Copyright 2005 by Wei-ju Wu
6 *
7 * This file is part of The Z-machine Preservation Project (ZMPP).
8 *
9 * ZMPP is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * ZMPP is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ZMPP; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23 package org.zmpp.vmutil;
24
25 import java.util.Random;
26
27 /***
28 * This class implements the predictable random number generator mentioned
29 * in the Z machine standards document. It takes a seed and generates the
30 * same sequence of numbers for equal seeds.
31 *
32 * @author Wei-ju Wu
33 * @version 1.0
34 */
35 public class PredictableRandomGenerator implements RandomGenerator {
36
37 /***
38 * The random generator.
39 */
40 private Random rand;
41
42 /***
43 * Constructor.
44 *
45 * @param seed the start seed.
46 */
47 public PredictableRandomGenerator(long seed) {
48
49 rand = new Random(seed);
50 }
51
52 /***
53 * {@inheritDoc}
54 */
55 public int next() {
56
57 return rand.nextInt(MAX_VALUE - 1) + 1;
58 }
59 }