org.optaplanner.core.api.score.buildin.simpledouble
Class SimpleDoubleScore

java.lang.Object
  org.optaplanner.core.api.score.AbstractScore<SimpleDoubleScore>
      org.optaplanner.core.api.score.buildin.simpledouble.SimpleDoubleScore

All Implemented Interfaces:

Serializable, Comparable<SimpleDoubleScore>, Score<SimpleDoubleScore>

public final class SimpleDoubleScore
extends AbstractScore<SimpleDoubleScore>

This Score is based on 1 level of double 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 SimpleBigDecimalScore instead.

This class is immutable.

See Also:

Score, Serialized Form

Method Summary

SimpleDoubleScore	add(SimpleDoubleScore augment) Returns a Score whose value is (this + augment).
int	compareTo(SimpleDoubleScore other)
SimpleDoubleScore	divide(double divisor) Returns a Score whose value is (this / divisor).
boolean	equals(Object o)
double	getScore() The total of the broken negative constraints and fulfilled positive hard constraints.
int	hashCode()
SimpleDoubleScore	multiply(double multiplicand) Returns a Score whose value is (this * multiplicand).
SimpleDoubleScore	negate() Returns a Score whose value is (- this).
static SimpleDoubleScore	parseScore(String scoreString)
SimpleDoubleScore	power(double exponent) Returns a Score whose value is (this ^ exponent).
SimpleDoubleScore	subtract(SimpleDoubleScore subtrahend) Returns a Score whose value is (this - subtrahend).
Number[]	toLevelNumbers() Returns an array of numbers representing the Score.
String	toString()
static SimpleDoubleScore	valueOf(double score)

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

Method Detail

parseScore

public static SimpleDoubleScore parseScore(String scoreString)

valueOf

public static SimpleDoubleScore valueOf(double score)

getScore

public double getScore()

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

Returns:

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

add

public SimpleDoubleScore add(SimpleDoubleScore augment)

Description copied from interface: Score

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

Parameters:

augment - value to be added to this Score

Returns:

this + augment

subtract

public SimpleDoubleScore subtract(SimpleDoubleScore subtrahend)

Description copied from interface: Score

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

Parameters:

subtrahend - value to be subtracted from this Score

Returns:

this - subtrahend, rounded as necessary

multiply

public SimpleDoubleScore 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.

Parameters:

multiplicand - value to be multiplied by this Score.

Returns:

this * multiplicand

divide

public SimpleDoubleScore 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.

Parameters:

divisor - value by which this Score is to be divided

Returns:

this / divisor

power

public SimpleDoubleScore 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.

Parameters:

exponent - value by which this Score is to be powered

Returns:

this ^ exponent

negate

public SimpleDoubleScore negate()

Description copied from interface: Score

Returns a Score whose value is (- this).

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}

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(SimpleDoubleScore other)

toString

public String toString()

Overrides:

toString in class Object