org.moeaframework.core.comparator
Class AggregateConstraintComparator

java.lang.Object
  org.moeaframework.core.comparator.AggregateConstraintComparator

All Implemented Interfaces:

Serializable, Comparator<Solution>, DominanceComparator

public class AggregateConstraintComparator
extends Object
implements DominanceComparator, Comparator<Solution>, Serializable

Compares solutions based on their magnitude of constraint violations. Absolute values of constraints are used, so only the magnitude of the constraint violation is important.

See Also:

Serialized Form

Constructor Summary

AggregateConstraintComparator()
Constructs an aggregate constraint comparator.

Method Summary

int	compare(Solution solution1, Solution solution2) Compares the two solutions using a dominance relation, returning -1 if solution1 dominates solution2, 1 if solution2 dominates solution1, and 0 if the solutions are non-dominated.
protected double	getConstraints(Solution solution) Returns the sum of the absolute value of the constraints for the specified solution.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

AggregateConstraintComparator

public AggregateConstraintComparator()

Constructs an aggregate constraint comparator.

Method Detail

getConstraints

protected double getConstraints(Solution solution)

Returns the sum of the absolute value of the constraints for the specified solution. This allows supporting constraints expressed as both positive and negative magnitudes. Larger magnitudes correspond to larger constraint violations.

Parameters:

solution - the solution

Returns:

the sum of the absolute value of the constraints for the specified solution

compare

public int compare(Solution solution1,
                   Solution solution2)

Description copied from interface: DominanceComparator

Compares the two solutions using a dominance relation, returning -1 if solution1 dominates solution2, 1 if solution2 dominates solution1, and 0 if the solutions are non-dominated.

Specified by:

compare in interface Comparator<Solution>

Specified by:

compare in interface DominanceComparator

Parameters:

solution1 - the first solution

solution2 - the second solution

Returns:

-1 if solution1 dominates solution2, 1 if solution2 dominates solution1, and 0 if the solutions are non-dominated