/*
 * 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 junit.framework.Test;
import junit.framework.TestSuite;
import java.util.Random;

/**
 * Test cases for the RandomAdaptor class
 *
 * @version $Revision$ $Date$
 */

public class RandomAdaptorTest extends RandomDataTest {

	public RandomAdaptorTest(String name) {
		super(name);
	}

	public static Test suite() {
		TestSuite suite = new TestSuite(RandomAdaptorTest.class);
		suite.setName("RandomAdaptor Tests");
		return suite;
	}

	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);
		assertEquals(0, bytes[0]);
		assertEquals(false, random.nextBoolean());
		assertEquals(0, random.nextDouble(), 0);
		assertEquals(0, random.nextFloat(), 0);
		assertEquals(0, random.nextGaussian(), 0);
		assertEquals(0, random.nextInt());
		assertEquals(0, random.nextInt(1));
		assertEquals(0, random.nextLong());
		random.setSeed(100);
		assertEquals(0, random.nextDouble(), 0);
	}

	/*
	 * "Constant" generator to test Adaptor delegation. "Powered by Eclipse ;-)"
	 * 
	 */
	private static class ConstantGenerator implements RandomGenerator {

		public boolean nextBoolean() {
			return false;
		}

		public void nextBytes(byte[] bytes) {
		}

		public double nextDouble() {
			return 0;
		}

		public float nextFloat() {
			return 0;
		}

		public double nextGaussian() {
			return 0;
		}

		public int nextInt() {
			return 0;
		}

		public int nextInt(int n) {
			return 0;
		}

		public long nextLong() {
			return 0;
		}

		public void setSeed(long seed) {
		}
	}
}
