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: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 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} */
setSeed(int seed)34     public void setSeed(int seed) {
35         setSeed((long) seed);
36     }
37 
38     /** {@inheritDoc} */
setSeed(int[] seed)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 }
51