org.optaplanner.core.api.score.buildin.hardsoftdouble
Class HardSoftDoubleScore

java.lang.Object
  org.optaplanner.core.api.score.AbstractScore<HardSoftDoubleScore>
      org.optaplanner.core.api.score.buildin.hardsoftdouble.HardSoftDoubleScore

All Implemented Interfaces:

Serializable, Comparable<HardSoftDoubleScore>, FeasibilityScore<HardSoftDoubleScore>, Score<HardSoftDoubleScore>

public final class HardSoftDoubleScore
extends AbstractScore<HardSoftDoubleScore>
implements FeasibilityScore<HardSoftDoubleScore>

This Score is based on 2 levels of double constraints: hard and soft. Hard constraints have priority over soft constraints.

WARNING: NOT RECOMMENDED TO USE DUE TO ROUNDING ERRORS THAT CAUSE SCORE CORRUPTION. For example, this prints false: System.out.println((0.01 + 0.05) == (0.01 + 0.02 + 0.03)); Use HardSoftBigDecimalScore instead.

This class is immutable.

See Also:

Score, Serialized Form

Method Summary

HardSoftDoubleScore	add(HardSoftDoubleScore augment) Returns a Score whose value is (this + augment).
int	compareTo(HardSoftDoubleScore other)
HardSoftDoubleScore	divide(double divisor) Returns a Score whose value is (this / divisor).
boolean	equals(Object o)
double	getHardScore() The total of the broken negative hard constraints and fulfilled positive hard constraints.
double	getSoftScore() The total of the broken negative soft constraints and fulfilled positive soft constraints.
int	hashCode()
boolean	isFeasible() A Solution is feasible if it has no broken hard constraints.
HardSoftDoubleScore	multiply(double multiplicand) Returns a Score whose value is (this * multiplicand).
HardSoftDoubleScore	negate() Returns a Score whose value is (- this).
static HardSoftDoubleScore	parseScore(String scoreString)
HardSoftDoubleScore	power(double exponent) Returns a Score whose value is (this ^ exponent).
HardSoftDoubleScore	subtract(HardSoftDoubleScore subtrahend) Returns a Score whose value is (this - subtrahend).
Number[]	toLevelNumbers() Returns an array of numbers representing the Score.
String	toString()
static HardSoftDoubleScore	valueOf(double hardScore, double softScore)

Methods inherited from class org.optaplanner.core.api.score.AbstractScore

buildScorePattern, buildScorePattern, isCompatibleArithmeticArgument, parseLevelAsBigDecimal, parseLevelAsDouble, parseLevelAsInt, parseLevelAsLong, parseLevelStrings, parseLevelStrings

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.optaplanner.core.api.score.Score

isCompatibleArithmeticArgument

Method Detail

parseScore

public static HardSoftDoubleScore parseScore(String scoreString)

valueOf

public static HardSoftDoubleScore valueOf(double hardScore,
                                          double softScore)

getHardScore

public double getHardScore()

The total of the broken negative hard constraints and fulfilled positive hard constraints. Their weight is included in the total. The hard score is usually a negative number because most use cases only have negative constraints.

Returns:

higher is better, usually negative, 0 if no hard constraints are broken/fulfilled

getSoftScore

public double getSoftScore()

The total of the broken negative soft constraints and fulfilled positive soft constraints. Their weight is included in the total. The soft score is usually a negative number because most use cases only have negative constraints.

In a normal score comparison, the soft score is irrelevant if the 2 scores don't have the same hard score.

Returns:

higher is better, usually negative, 0 if no soft constraints are broken/fulfilled

isFeasible

public boolean isFeasible()

Description copied from interface: FeasibilityScore

A Solution is feasible if it has no broken hard constraints.

Specified by:

isFeasible in interface FeasibilityScore<HardSoftDoubleScore>

Returns:

true if the hard score(s) is 0 or higher

add

public HardSoftDoubleScore add(HardSoftDoubleScore augment)

Description copied from interface: Score

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

Specified by:

add in interface Score<HardSoftDoubleScore>

Parameters:

augment - value to be added to this Score

Returns:

this + augment

subtract

public HardSoftDoubleScore subtract(HardSoftDoubleScore subtrahend)

Description copied from interface: Score

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

Specified by:

subtract in interface Score<HardSoftDoubleScore>

Parameters:

subtrahend - value to be subtracted from this Score

Returns:

this - subtrahend, rounded as necessary

multiply

public HardSoftDoubleScore multiply(double multiplicand)

Description copied from interface: Score

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.

Specified by:

multiply in interface Score<HardSoftDoubleScore>

Parameters:

multiplicand - value to be multiplied by this Score.

Returns:

this * multiplicand

divide

public HardSoftDoubleScore divide(double divisor)

Description copied from interface: Score

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.

Specified by:

divide in interface Score<HardSoftDoubleScore>

Parameters:

divisor - value by which this Score is to be divided

Returns:

this / divisor

power

public HardSoftDoubleScore power(double exponent)

Description copied from interface: Score

Returns a Score whose value is (this ^ exponent). 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 exponent should have no impact on the returned scale/precision.

Specified by:

power in interface Score<HardSoftDoubleScore>

Parameters:

exponent - value by which this Score is to be powered

Returns:

this ^ exponent

negate

public HardSoftDoubleScore negate()

Description copied from interface: Score

Returns a Score whose value is (- this).

Specified by:

negate in interface Score<HardSoftDoubleScore>

Returns:

- this

toLevelNumbers

public Number[] toLevelNumbers()

Description copied from interface: Score

Returns an array of numbers representing the Score. Each number 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 int{-0, -7}

Specified by:

toLevelNumbers in interface Score<HardSoftDoubleScore>

Returns:

never null

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareTo

public int compareTo(HardSoftDoubleScore other)

Specified by:

compareTo in interface Comparable<HardSoftDoubleScore>

toString

public String toString()

Overrides:

toString in class Object