| /* |
| * 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.math3.random; |
| |
| import java.util.Random; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * Test cases for the RandomAdaptor class |
| * |
| */ |
| |
| public class RandomAdaptorTest { |
| |
| @Test |
| public void testAdaptor() { |
| ConstantGenerator generator = new ConstantGenerator(); |
| Random random = RandomAdaptor.createAdaptor(generator); |
| checkConstant(random); |
| RandomAdaptor randomAdaptor = new RandomAdaptor(generator); |
| checkConstant(randomAdaptor); |
| } |
| |
| private void checkConstant(Random random) { |
| byte[] bytes = new byte[] {0}; |
| random.nextBytes(bytes); |
| Assert.assertEquals(0, bytes[0]); |
| Assert.assertFalse(random.nextBoolean()); |
| Assert.assertEquals(0, random.nextDouble(), 0); |
| Assert.assertEquals(0, random.nextFloat(), 0); |
| Assert.assertEquals(0, random.nextGaussian(), 0); |
| Assert.assertEquals(0, random.nextInt()); |
| Assert.assertEquals(0, random.nextInt(1)); |
| Assert.assertEquals(0, random.nextLong()); |
| random.setSeed(100); |
| Assert.assertEquals(0, random.nextDouble(), 0); |
| } |
| |
| /* |
| * "Constant" generator to test Adaptor delegation. |
| * "Powered by Eclipse ;-)" |
| * |
| */ |
| public static class ConstantGenerator implements RandomGenerator { |
| |
| private final double value; |
| |
| public ConstantGenerator() { |
| value = 0; |
| } |
| |
| public ConstantGenerator(double value) { |
| this.value = value; |
| } |
| |
| public boolean nextBoolean() { |
| return false; |
| } |
| |
| public void nextBytes(byte[] bytes) { |
| } |
| |
| public double nextDouble() { |
| return value; |
| } |
| |
| public float nextFloat() { |
| return (float) value; |
| } |
| |
| public double nextGaussian() { |
| return value; |
| } |
| |
| public int nextInt() { |
| return (int) value; |
| } |
| |
| public int nextInt(int n) { |
| return (int) value; |
| } |
| |
| public long nextLong() { |
| return (int) value; |
| } |
| |
| public void setSeed(int seed) { |
| } |
| |
| public void setSeed(int[] seed) { |
| } |
| |
| public void setSeed(long seed) { |
| } |
| |
| } |
| } |