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

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

All Implemented Interfaces:
  Serializable, CountableValueRange<T>, ValueRange<T>

    public class NullableCountableValueRange<T>

extends AbstractCountableValueRange<T>

See Also:
  Serialized Form

Constructor Summary
`NullableCountableValueRange(CountableValueRange<T> childValueRange)`

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.
`ValueRange<T>` | `getChildValueRange()`
`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

### NullableCountableValueRange

    public NullableCountableValueRange(CountableValueRange<T> childValueRange)

Method Detail

### getChildValueRange

    public ValueRange<T> getChildValueRange()

### 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

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