net.jqwik.engine.properties.arbitraries.randomized.GaussianRandomDistribution Maven / Gradle / Ivy

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package net.jqwik.engine.properties.arbitraries.randomized;

import java.math.*;

import net.jqwik.api.*;

public class GaussianRandomDistribution implements RandomDistribution {

	private final double borderSigma;

	public GaussianRandomDistribution(double borderSigma) {
		if (borderSigma <= 0) {
			throw new IllegalArgumentException("borderSigma must be greater than 0");
		}
		this.borderSigma = borderSigma;
	}

	@Override
	public RandomNumericGenerator createGenerator(int genSize, BigInteger min, BigInteger max, BigInteger center) {
		return new GaussianNumericGenerator(borderSigma, min, max, center);
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;

		GaussianRandomDistribution that = (GaussianRandomDistribution) o;
		return Double.compare(that.borderSigma, borderSigma) == 0;
	}

	@Override
	public int hashCode() {
		long temp = Double.doubleToLongBits(borderSigma);
		return (int) (temp ^ (temp >>> 32));
	}

	@Override
	public String toString() {
		return String.format("GaussianDistribution(%s)", borderSigma);
	}
}