Package 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:
CountableValueRange<T>, ValueRange<T>
public class EmptyValueRange<T> extends AbstractCountableValueRange<T>

  • Constructor Details

    • EmptyValueRange

      public EmptyValueRange()

  • Method Details

    • 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, 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 runs are reproducible.
      Returns:
      never null

    • toString

      public String toString()
      Overrides:
      toString in class Object