001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.math.random;
018
019 import java.util.Random;
020
021 /**
022 * Extension of <code>java.util.Random</code> to implement
023 * {@link RandomGenerator}.
024 *
025 * @since 1.1
026 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
027 */
028 public class JDKRandomGenerator extends Random implements RandomGenerator {
029
030 /** Serializable version identifier. */
031 private static final long serialVersionUID = -7745277476784028798L;
032
033 /** {@inheritDoc} */
034 public void setSeed(int seed) {
035 setSeed((long) seed);
036 }
037
038 /** {@inheritDoc} */
039 public void setSeed(int[] seed) {
040 // the following number is the largest prime that fits in 32 bits (it is 2^32 - 5)
041 final long prime = 4294967291l;
042
043 long combined = 0l;
044 for (int s : seed) {
045 combined = combined * prime + s;
046 }
047 setSeed(combined);
048 }
049
050 }