1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.math.random;
18
19 import java.util.Random;
20
21 /**
22 * Extension of <code>java.util.Random</code> to implement
23 * {@link RandomGenerator}.
24 *
25 * @since 1.1
26 * @version $Revision: 796543 $ $Date: 2009-07-21 17:32:38 -0400 (Tue, 21 Jul 2009) $
27 */
28 public class JDKRandomGenerator extends Random implements RandomGenerator {
29
30 /** Serializable version identifier. */
31 private static final long serialVersionUID = -7745277476784028798L;
32
33 /** {@inheritDoc} */
34 public void setSeed(int seed) {
35 setSeed((long) seed);
36 }
37
38 /** {@inheritDoc} */
39 public void setSeed(int[] seed) {
40 // the following number is the largest prime that fits in 32 bits (it is 2^32 - 5)
41 final long prime = 4294967291l;
42
43 long combined = 0l;
44 for (int s : seed) {
45 combined = combined * prime + s;
46 }
47 setSeed(combined);
48 }
49
50 }