net.java.quickcheck.generator.support.DoubleGenerator Maven / Gradle / Ivy

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/*
 *  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
 *
 *  Licensed to the author under one or more
 *  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 net.java.quickcheck.generator.support;

import static java.lang.String.*;
import net.java.quickcheck.Generator;
import net.java.quickcheck.generator.distribution.Distribution;
import net.java.quickcheck.util.Assert;

public class DoubleGenerator implements Generator {

	private final double min;
	private final double max;
	private final Distribution distribution;

	public DoubleGenerator() {
		this(Double.MIN_VALUE, Double.MAX_VALUE);
	}

	public DoubleGenerator(double min, double max) {
		this(min, max, Distribution.UNIFORM);
	}

	public DoubleGenerator(double min, double max, Distribution dist) {
		Assert.lessOrEqual(max, min, "min");
		Assert.notNull(dist, "dist");

		this.min = min;
		this.max = max;
		this.distribution = dist;
	}

	public Double next() {
		return nextDouble();
	}

	public double nextDouble() {
		return this.distribution.nextRandomNumber() * (this.max - this.min) + this.min;
	}
	
	@Override
	public String toString() {
		return format("%s[min=%s, max=%s, distribution=%s", getClass().getSimpleName(), min, max, distribution);
	}
}