org.optaplanner.core.impl.domain.valuerange.buildin.composite
Class EmptyValueRange<T>

java.lang.Object
  org.optaplanner.core.impl.domain.valuerange.AbstractCountableValueRange<T>
      org.optaplanner.core.impl.domain.valuerange.buildin.composite.EmptyValueRange<T>

All Implemented Interfaces:

Serializable, CountableValueRange<T>, ValueRange<T>

public class EmptyValueRange<T>
extends AbstractCountableValueRange<T>

See Also:

Serialized Form

Constructor Summary

EmptyValueRange()

Method Summary

boolean	contains(T value)
Iterator<T>	createOriginalIterator() Select the elements in original (natural) order.
Iterator<T>	createRandomIterator(Random workingRandom) Select in random order, without shuffling the elements.
T	get(long index) Used by uniform random selection in a composite or nullable CountableValueRange.
long	getSize() Used by uniform random selection in a composite or nullable CountableValueRange.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyValueRange

public EmptyValueRange()

Method Detail

getSize

public long getSize()

Description copied from interface: CountableValueRange

Used by uniform random selection in a composite or nullable CountableValueRange.

Returns:

the exact number of elements generated by this CountableValueRange, always >= 0

get

public T get(long index)

Description copied from interface: CountableValueRange

Used by uniform random selection in a composite or nullable CountableValueRange.

Parameters:

index - always < CountableValueRange.getSize()

Returns:

sometimes null (if PlanningVariable.nullable() is true)

contains

public boolean contains(T value)

Parameters:

value - sometimes null

Returns:

true if the ValueRange contains that value

createOriginalIterator

public Iterator<T> createOriginalIterator()

Description copied from interface: CountableValueRange

Select the elements in original (natural) order.

Returns:

never null

createRandomIterator

public Iterator<T> createRandomIterator(Random workingRandom)

Description copied from interface: ValueRange

Select in random order, 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

Returns:

never null