org.uma.jmetal.util.pseudorandom

Interface BoundedRandomGenerator<Value extends Comparable<Value>>

Type Parameters:

Value - The type of value to generate

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface BoundedRandomGenerator<Value extends Comparable<Value>>

A BoundedRandomGenerator aims to provide a random value within a specific range. The range is inclusive, such that the lower bound and upper bound can be generated. Because lower and upper bounds make no sense if values cannot be compared, only Comparable values can be generated through this kind of generator.

A BoundedRandomGenerator is a FunctionalInterface. It is not intended to be directly implemented by a class, but instead to request a method for generating random values, usually by using lambda expressions.

Author:

Matthieu Vergne

Method Summary

Modifier and Type	Method and Description
static BoundedRandomGenerator<Double>	bound(RandomGenerator<Double> unboundedGenerator) Create a BoundedRandomGenerator from a RandomGenerator which generate Double values between 0 and 1 (inclusive or exclusive).
static BoundedRandomGenerator<Integer>	fromDoubleToInteger(BoundedRandomGenerator<Double> doubleGenerator) Create a BoundedRandomGenerator which generates Integer values from a BoundedRandomGenerator which generate Double values.
static BoundedRandomGenerator<Integer>	fromDoubleToInteger(RandomGenerator<Double> doubleGenerator) Create a BoundedRandomGenerator which generates Integer values from a BoundedRandomGenerator which generate Double values between 0 and 1 (inclusive or exclusive).
Value	getRandomValue(Value lowerBound, Value upperBound) Generate a random value within the provided range.

Method Detail

getRandomValue

Value getRandomValue(Value lowerBound,
                     Value upperBound)

Generate a random value within the provided range.

Parameters:

lowerBound - the minimal value which can be generated

upperBound - the maximal value which can be generated

Returns:

the value generated

fromDoubleToInteger

static BoundedRandomGenerator<Integer> fromDoubleToInteger(BoundedRandomGenerator<Double> doubleGenerator)

Create a BoundedRandomGenerator which generates Integer values from a BoundedRandomGenerator which generate Double values. The distribution is preserved.

Parameters:

doubleGenerator - BoundedRandomGenerator which generates Double values

Returns:

BoundedRandomGenerator which generates Integer values based on the provided generator

fromDoubleToInteger

static BoundedRandomGenerator<Integer> fromDoubleToInteger(RandomGenerator<Double> doubleGenerator)

Create a BoundedRandomGenerator which generates Integer values from a BoundedRandomGenerator which generate Double values between 0 and 1 (inclusive or exclusive). The distribution is preserved.

Parameters:

doubleGenerator - RandomGenerator which generates Double values

Returns:

BoundedRandomGenerator which generates Integer values based on the provided generator

bound

static BoundedRandomGenerator<Double> bound(RandomGenerator<Double> unboundedGenerator)

Create a BoundedRandomGenerator from a RandomGenerator which generate Double values between 0 and 1 (inclusive or exclusive). The distribution is preserved.

Parameters:

unboundedGenerator - RandomGenerator which generates values between 0 and 1

Returns:

BoundedRandomGenerator which generates Double values based on the provided generator