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Diffstat (limited to 'src/main/java/org/apache/commons/math/random/JDKRandomGenerator.java')
-rw-r--r-- | src/main/java/org/apache/commons/math/random/JDKRandomGenerator.java | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math/random/JDKRandomGenerator.java b/src/main/java/org/apache/commons/math/random/JDKRandomGenerator.java new file mode 100644 index 0000000..573ef61 --- /dev/null +++ b/src/main/java/org/apache/commons/math/random/JDKRandomGenerator.java @@ -0,0 +1,50 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.commons.math.random; + +import java.util.Random; + +/** + * Extension of <code>java.util.Random</code> to implement + * {@link RandomGenerator}. + * + * @since 1.1 + * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $ + */ +public class JDKRandomGenerator extends Random implements RandomGenerator { + + /** Serializable version identifier. */ + private static final long serialVersionUID = -7745277476784028798L; + + /** {@inheritDoc} */ + public void setSeed(int seed) { + setSeed((long) seed); + } + + /** {@inheritDoc} */ + public void setSeed(int[] seed) { + // the following number is the largest prime that fits in 32 bits (it is 2^32 - 5) + final long prime = 4294967291l; + + long combined = 0l; + for (int s : seed) { + combined = combined * prime + s; + } + setSeed(combined); + } + +} |