org.optaplanner.core.api.domain.valuerange

Interface ValueRange<T>

All Known Subinterfaces:

CountableValueRange<T>

All Known Implementing Classes:

AbstractCountableValueRange, AbstractUncountableValueRange, BigDecimalValueRange, BigIntegerValueRange, BooleanValueRange, CompositeCountableValueRange, DoubleValueRange, EmptyValueRange, IntValueRange, ListValueRange, LongValueRange, NullableCountableValueRange, TemporalValueRange

public interface ValueRange<T>

A ValueRange is a set of a values for a PlanningVariable. These values might be stored in memory as a Collection (usually a List or Set), but if the values are numbers, they can also be stored in memory by their bounds to use less memory and provide more opportunities.

Prefer using CountableValueRange (which extends this interface) whenever possible.

A ValueRange is stateful (unlike a ValueSelector which is stateless).

Implementations must be immutable.

An implementation must extend AbstractCountableValueRange or AbstractUncountableValueRange to ensure backwards compatibility in future versions.

See Also:

ValueRangeFactory, CountableValueRange, AbstractCountableValueRange, AbstractUncountableValueRange

Method Summary

Modifier and Type	Method and Description
boolean	contains(T value)
Iterator<T>	createRandomIterator(Random workingRandom) Select in random order, but without shuffling the elements.
boolean	isEmpty() In a CountableValueRange, this must be consistent with CountableValueRange.getSize().

Method Detail

isEmpty

boolean isEmpty()

In a CountableValueRange, this must be consistent with CountableValueRange.getSize().

Returns:

true if the range is empty

contains

boolean contains(T value)

Parameters:

value - sometimes null

Returns:

true if the ValueRange contains that value

createRandomIterator

Iterator<T> createRandomIterator(Random workingRandom)

Select in random order, but without shuffling the elements. Each element might be selected multiple times. Scales well because it does not require caching.

Parameters:

workingRandom - never null, the Random to use when any random number is needed, so EnvironmentMode.REPRODUCIBLE works correctly. RandomUtils can be useful too.

Returns:

never null