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.math3.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 $Id: JDKRandomGenerator.java 1416643 2012-12-03 19:37:14Z tn $
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    }