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

## Class AbstractCachingValueSelector

- 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.AbstractCachingValueSelector

- All Implemented Interfaces:
    EventListener, SelectionCacheLifecycleListener, Selector, ValueSelector, PhaseLifecycleListener, SolverLifecycleListener
  Direct Known Subclasses:
    CachingValueSelector, ShufflingValueSelector, SortingValueSelector

      public abstract class AbstractCachingValueSelector
      extends AbstractValueSelector
      implements SelectionCacheLifecycleListener

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected List<Object>` | `cachedValueList`
    `protected SelectionCacheType` | `cacheType`
    `protected EntityIndependentValueSelector` | `childValueSelector`

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

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AbstractCachingValueSelector(EntityIndependentValueSelector childValueSelector, SelectionCacheType cacheType)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `constructCache(DefaultSolverScope solverScope)`
    `void` | `disposeCache(DefaultSolverScope solverScope)`
    `Iterator<Object>` | `endingIterator()`
    `Iterator<Object>` | `endingIterator(Object entity)` If `Selector.isNeverEnding()` is true, then `ValueSelector.iterator(Object)` will never end.
    `SelectionCacheType` | `getCacheType()` Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
    `ValueSelector` | `getChildValueSelector()`
    `long` | `getSize()`
    `long` | `getSize(Object entity)` Similar to `IterableSelector.getSize()`, but requires an entity.
    `GenuineVariableDescriptor` | `getVariableDescriptor()`
    `boolean` | `isCountable()` If false, then `Selector.isNeverEnding()` is true.

    - ### 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, toString, wait, wait, wait`

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

      `iterator`

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

      `isNeverEnding`

    - ### 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`

- - ### Field Detail

    - #### childValueSelector

          protected final EntityIndependentValueSelector childValueSelector

    - #### cacheType

          protected final SelectionCacheType cacheType

    - #### cachedValueList

          protected List<Object> cachedValueList

  - ### Constructor Detail

    - #### AbstractCachingValueSelector

          public AbstractCachingValueSelector(EntityIndependentValueSelector childValueSelector,
                                              SelectionCacheType cacheType)

  - ### Method Detail

    - #### getChildValueSelector

          public ValueSelector getChildValueSelector()

    - #### getCacheType

          public SelectionCacheType getCacheType()

      Description copied from interface: `Selector`
      Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
      Specified by:
        `getCacheType` in interface `Selector`
      Overrides:
        `getCacheType` in class `AbstractSelector`
      Returns:
        never null

    - #### constructCache

          public void constructCache(DefaultSolverScope solverScope)

      Specified by:
        `constructCache` in interface `SelectionCacheLifecycleListener`

    - #### disposeCache

          public void disposeCache(DefaultSolverScope solverScope)

      Specified by:
        `disposeCache` in interface `SelectionCacheLifecycleListener`

    - #### 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)

    - #### 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()

    - #### 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)`

    - #### endingIterator

          public Iterator<Object> endingIterator()

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