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

## Class CachingEntitySelector

- java.lang.Object
- - org.optaplanner.core.impl.heuristic.selector.AbstractSelector
  - - org.optaplanner.core.impl.heuristic.selector.entity.AbstractEntitySelector
    - - org.optaplanner.core.impl.heuristic.selector.entity.decorator.AbstractCachingEntitySelector
      - - org.optaplanner.core.impl.heuristic.selector.entity.decorator.CachingEntitySelector

- All Implemented Interfaces:
    Iterable<Object>, EventListener, ListIterable<Object>, SelectionCacheLifecycleListener, EntitySelector, IterableSelector<Object>, ListIterableSelector<Object>, Selector, PhaseLifecycleListener, SolverLifecycleListener

      public class CachingEntitySelector
      extends AbstractCachingEntitySelector

  A `EntitySelector` that caches the result of its child `EntitySelector`.

  Keep this code in sync with `CachingValueSelector` and `CachingMoveSelector`.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected boolean` | `randomSelection`

    - ### Fields inherited from class org.optaplanner.core.impl.heuristic.selector.entity.decorator.AbstractCachingEntitySelector

      `cachedEntityList, cacheType, childEntitySelector`

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

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `CachingEntitySelector(EntitySelector childEntitySelector, SelectionCacheType cacheType, boolean randomSelection)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `isNeverEnding()` Is true if `Selector.isCountable()` is false or if this selector is in random order (for most cases).
    `Iterator<Object>` | `iterator()`
    `ListIterator<Object>` | `listIterator()`
    `ListIterator<Object>` | `listIterator(int index)`
    `String` | `toString()`

    - ### Methods inherited from class org.optaplanner.core.impl.heuristic.selector.entity.decorator.AbstractCachingEntitySelector

      `constructCache, disposeCache, endingIterator, getCacheType, getChildEntitySelector, getEntityDescriptor, getSize, isCountable`

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

      `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.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

    - #### randomSelection

          protected final boolean randomSelection

  - ### Constructor Detail

    - #### CachingEntitySelector

          public CachingEntitySelector(EntitySelector childEntitySelector,
                                       SelectionCacheType cacheType,
                                       boolean randomSelection)

  - ### Method Detail

    - #### 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).
      Returns:
        true if the `Iterator.hasNext()` of the `Iterator` created by `Iterable.iterator()` never returns false (except when it's empty).

    - #### iterator

          public Iterator<Object> iterator()

    - #### listIterator

          public ListIterator<Object> listIterator()

      Returns:
        never null, see `List.listIterator()`.
      See Also:
        `List.listIterator()`

    - #### listIterator

          public ListIterator<Object> listIterator(int index)

      Parameters:
        `index` - lower than the size of this `ListIterable`, see `List.listIterator(int)`.
      Returns:
        never null, see `List.listIterator(int)`.
      See Also:
        `List.listIterator()`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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