org.optaplanner.core.impl.heuristic.selector.value.decorator

## Class SelectedCountLimitValueSelector

- java.lang.Object
- - org.optaplanner.core.impl.heuristic.selector.AbstractSelector
  - - org.optaplanner.core.impl.heuristic.selector.value.AbstractValueSelector
    - - org.optaplanner.core.impl.heuristic.selector.value.decorator.SelectedCountLimitValueSelector

- All Implemented Interfaces:
    Iterable<Object>, EventListener, IterableSelector<Object>, Selector, EntityIndependentValueSelector, ValueSelector, PhaseLifecycleListener, SolverLifecycleListener

      public class SelectedCountLimitValueSelector
      extends AbstractValueSelector
      implements EntityIndependentValueSelector

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected ValueSelector` | `childValueSelector`
    `protected long` | `selectedCountLimit`

    - ### Fields inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SelectedCountLimitValueSelector(ValueSelector childValueSelector, long selectedCountLimit)` Unlike most of the other `ValueSelector` decorations, this one works for an entity dependent `ValueSelector` too.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Iterator<Object>` | `endingIterator(Object entity)` If `Selector.isNeverEnding()` is true, then `ValueSelector.iterator(Object)` will never end.
    `long` | `getSize()` A random JIT `Selector` with `Selector.isNeverEnding()` true should return a size as if it would be able to return each distinct element only once, because the size can be used in `SelectionProbabilityWeightFactory`.
    `long` | `getSize(Object entity)` Similar to `IterableSelector.getSize()`, but requires an entity.
    `GenuineVariableDescriptor` | `getVariableDescriptor()`
    `boolean` | `isCountable()` If false, then `Selector.isNeverEnding()` is true.
    `boolean` | `isNeverEnding()` Is true if `Selector.isCountable()` is false or if this selector is in random order (for most cases).
    `Iterator<Object>` | `iterator()`
    `Iterator<Object>` | `iterator(Object entity)` Similar to `Iterable.iterator()`, but requires an entity.
    `String` | `toString()`

    - ### Methods inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector

      `getCacheType, phaseEnded, phaseStarted, solvingEnded, solvingStarted, stepEnded, stepStarted`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface org.optaplanner.core.impl.heuristic.selector.Selector

      `getCacheType`

    - ### Methods inherited from interface org.optaplanner.core.impl.phase.event.PhaseLifecycleListener

      `phaseEnded, phaseStarted, stepEnded, stepStarted`

    - ### Methods inherited from interface org.optaplanner.core.impl.solver.event.SolverLifecycleListener

      `solvingEnded, solvingStarted`

    - ### Methods inherited from interface java.lang.Iterable

      `forEach, spliterator`

- - ### Field Detail

    - #### childValueSelector

          protected final ValueSelector childValueSelector

    - #### selectedCountLimit

          protected final long selectedCountLimit

  - ### Constructor Detail

    - #### SelectedCountLimitValueSelector

          public SelectedCountLimitValueSelector(ValueSelector childValueSelector,
                                                 long selectedCountLimit)

      Unlike most of the other `ValueSelector` decorations, this one works for an entity dependent `ValueSelector` too.
      Parameters:
        `childValueSelector` - never null, if any of the `EntityIndependentValueSelector` specific methods are going to be used, this parameter must also implement that interface
        `selectedCountLimit` - at least 0

  - ### Method Detail

    - #### getVariableDescriptor

          public GenuineVariableDescriptor getVariableDescriptor()

      Specified by:
        `getVariableDescriptor` in interface `ValueSelector`
      Returns:
        never null

    - #### isCountable

          public boolean isCountable()

      Description copied from interface: `Selector`
      If false, then `Selector.isNeverEnding()` is true.
      Specified by:
        `isCountable` in interface `Selector`
      Returns:
        true if all the `ValueRange`s are countable (for example a double value range between 1.2 and 1.4 is not countable)

    - #### isNeverEnding

          public boolean isNeverEnding()

      Description copied from interface: `Selector`
      Is true if `Selector.isCountable()` is false or if this selector is in random order (for most cases). Is never true when this selector is in shuffled order (which is less scalable but more exact).
      Specified by:
        `isNeverEnding` in interface `Selector`
      Returns:
        true if the `Iterator.hasNext()` of the `Iterator` created by `Iterable.iterator()` never returns false (except when it's empty).

    - #### getSize

          public long getSize(Object entity)

      Description copied from interface: `ValueSelector`
      Similar to `IterableSelector.getSize()`, but requires an entity.
      Specified by:
        `getSize` in interface `ValueSelector`
      Parameters:
        `entity` - never null
      Returns:
        the approximate number of elements generated by this `Selector`, always `>= 0`

    - #### getSize

          public long getSize()

      Description copied from interface: `IterableSelector`
      A random JIT `Selector` with `Selector.isNeverEnding()` true should return a size as if it would be able to return each distinct element only once, because the size can be used in `SelectionProbabilityWeightFactory`.
      Specified by:
        `getSize` in interface `IterableSelector<Object>`
      Returns:
        the approximate number of elements generated by this `Selector`, always `>= 0`

    - #### iterator

          public Iterator<Object> iterator(Object entity)

      Description copied from interface: `ValueSelector`
      Similar to `Iterable.iterator()`, but requires an entity.
      Specified by:
        `iterator` in interface `ValueSelector`
      Parameters:
        `entity` - never null
      Returns:
        never null

    - #### iterator

          public Iterator<Object> iterator()

      Specified by:
        `iterator` in interface `Iterable<Object>`

    - #### endingIterator

          public Iterator<Object> endingIterator(Object entity)

      Description copied from interface: `ValueSelector`
      If `Selector.isNeverEnding()` is true, then `ValueSelector.iterator(Object)` will never end. This returns an ending `Iterator`, that tries to match `ValueSelector.iterator(Object)` as much as possible, but return each distinct element only once and therefore it might not respect the configuration of this `ValueSelector` entirely.
      Specified by:
        `endingIterator` in interface `ValueSelector`
      Parameters:
        `entity` - never null
      Returns:
        never null
      See Also:
        `ValueSelector.iterator(Object)`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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