Package org.uma.jmetal.util

Class ConstraintHandling

java.lang.Object

org.uma.jmetal.util.ConstraintHandling

public class ConstraintHandling
extends Object

This class offers a set of static methods for setting and getting information about constraints in solutions.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	ConstraintHandling.PRECOMPUTED	The computing of the constraints can be precomputed when evaluating a solution.

Constructor Summary

Constructors

Constructor	Description
ConstraintHandling()

Method Summary

Modifier and Type	Method	Description
static <S extends Solution<?>> double	feasibilityRatio(List<S> solutions)	Returns the ratio of feasible solutions in a solution list
static <S extends Solution<?>> boolean	isFeasible(S solution)	Given a solution, it is feasible if the number of violated constraints is zero
static <S extends Solution<?>> int	numberOfViolatedConstraints(S solution)	Returns the number of constraints a solution violates.
static <S extends Solution<?>> void	numberOfViolatedConstraints(S solution, int numberOfViolatedConstraints)	Sets the number of violated constraints in a solution
static <S extends Solution<?>> double	overallConstraintViolationDegree(S solution)	Returns the overall constraint violation degree of a solution.
static <S extends Solution<?>> void	overallConstraintViolationDegree(S solution, double constraintViolationDegreeValue)	Sets the overall constraint violation degree of a solution

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ConstraintHandling

public ConstraintHandling()

Method Details

isFeasible

public static <S extends Solution<?>> boolean isFeasible(S solution)

Given a solution, it is feasible if the number of violated constraints is zero

Type Parameters:

S -

Parameters:

solution -

Returns:

numberOfViolatedConstraints

public static <S extends Solution<?>> int numberOfViolatedConstraints(S solution)

Returns the number of constraints a solution violates. A check is made to determine whether that number has been precomputed; if not, it is calculated as the sum of the constraints having a negative value.

Type Parameters:

S -

Parameters:

solution -

Returns:

overallConstraintViolationDegree

public static <S extends Solution<?>> void overallConstraintViolationDegree(S solution,
 double constraintViolationDegreeValue)

Sets the overall constraint violation degree of a solution

Type Parameters:

S -

Parameters:

solution -

constraintViolationDegreeValue -

numberOfViolatedConstraints

public static <S extends Solution<?>> void numberOfViolatedConstraints(S solution,
 int numberOfViolatedConstraints)

Sets the number of violated constraints in a solution

Type Parameters:

S -

Parameters:

solution -

numberOfViolatedConstraints -

overallConstraintViolationDegree

public static <S extends Solution<?>> double overallConstraintViolationDegree(S solution)

Returns the overall constraint violation degree of a solution. A check is made to determine whether that number has been precomputed; if not, it is calculated as the sum of the values of the constraints having a negative value.

Type Parameters:

S -

Parameters:

solution -

Returns:

feasibilityRatio

public static <S extends Solution<?>> double feasibilityRatio(List<S> solutions)

Returns the ratio of feasible solutions in a solution list

Parameters:

solutions -

Returns: