org.drools.planner.core.score
Interface Score<S extends Score>

All Superinterfaces:

Comparable<S>

All Known Subinterfaces:

FeasibilityScore<S>

All Known Implementing Classes:

AbstractScore, BendableScore, HardMediumSoftScore, HardSoftBigDecimalScore, HardSoftDoubleScore, HardSoftLongScore, HardSoftScore, SimpleBigDecimalScore, SimpleDoubleScore, SimpleLongScore, SimpleScore

public interface Score<S extends Score>
extends Comparable<S>

A Score is result of the score function (AKA fitness function) on a single possible solution.

Implementations must be immutable.

Implementations are allowed to optionally implement Pareto comparison and therefore slightly violate the transitive requirement of Comparable.compareTo(Object).

See Also:

AbstractScore, HardSoftScore

Method Summary

S	add(S augment) Returns a Score whose value is (this + augment).
S	divide(double divisor) Returns a Score whose value is (this / divisor).
S	multiply(double multiplicand) Returns a Score whose value is (this * multiplicand).
S	subtract(S subtrahend) Returns a Score whose value is (this - subtrahend).
double[]	toDoubleLevels() Returns an array of doubles representing the Score.

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

add

S add(S augment)

Returns a Score whose value is (this + augment).

Parameters:

augment - value to be added to this Score

Returns:

this + augment

subtract

S subtract(S subtrahend)

Returns a Score whose value is (this - subtrahend).

Parameters:

subtrahend - value to be subtracted from this Score

Returns:

this - subtrahend, rounded as necessary

multiply

S multiply(double multiplicand)

Returns a Score whose value is (this * multiplicand). When rounding is needed, it should be floored (as defined by Math.floor(double).

/> If the implementation has a scale/precision, then the unspecified scale/precision of the double multiplicand should have no impact on the returned scale/precision.

Parameters:

multiplicand - value to be multiplied by this Score.

Returns:

this * multiplicand

divide

S divide(double divisor)

Returns a Score whose value is (this / divisor). When rounding is needed, it should be floored (as defined by Math.floor(double).

/> If the implementation has a scale/precision, then the unspecified scale/precision of the double divisor should have no impact on the returned scale/precision.

Parameters:

divisor - value by which this Score is to be divided

Returns:

this / divisor

toDoubleLevels

double[] toDoubleLevels()

Returns an array of doubles representing the Score. Each double represents 1 score level. A greater score level uses a lower array index than a lesser score level.

When rounding is needed, each rounding should be floored (as defined by Math.floor(double). The length of the returned array must be stable for a specific Score implementation.

For example: -0hard/-7soft returns new double{-0.0, -7.0}

Returns:

never null