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## org.optaplanner.core.impl.heuristic.selector
Interface Selector

All Superinterfaces:
  EventListener, SolverLifecycleListener, SolverPhaseLifecycleListener

All Known Subinterfaces:
  EntityIndependentValueSelector, EntitySelector, IterableSelector<T>, ListIterableSelector<T>, MoveSelector, PillarSelector, SubChainSelector, ValueSelector

All Known Implementing Classes:
  AbstractCachingEntitySelector, AbstractCachingMoveSelector, AbstractCachingValueSelector, AbstractEntitySelector, AbstractMoveSelector, AbstractSelector, AbstractValueSelector, CachingEntitySelector, CachingMoveSelector, CachingValueSelector, CartesianProductMoveSelector, ChangeMoveSelector, CompositeMoveSelector, DefaultSubChainSelector, FilteringEntitySelector, FilteringMoveSelector, FromEntityPropertyValueSelector, FromSolutionEntitySelector, FromSolutionPropertyValueSelector, GenericMoveSelector, MoveIteratorFactoryToMoveSelectorBridge, MoveListFactoryToMoveSelectorBridge, PillarSwapMoveSelector, ProbabilityEntitySelector, ProbabilityMoveSelector, ProbabilityValueSelector, SameValuePillarSelector, ShufflingEntitySelector, ShufflingMoveSelector, ShufflingValueSelector, SortingEntitySelector, SortingMoveSelector, SubChainChangeMoveSelector, SubChainSwapMoveSelector, SwapMoveSelector, UnionMoveSelector

    public interface Selector

extends SolverPhaseLifecycleListener

General interface for `MoveSelector`, `EntitySelector` and `ValueSelector` which generates `Move`s or parts of them.

Method Summary
`SelectionCacheType` | `getCacheType()` Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.
`boolean` | `isContinuous()` If true, then `isNeverEnding()` is also true.
`boolean` | `isNeverEnding()` Is true if `isContinuous()` is true or if this selector is in random order (for most cases).

Methods inherited from interface org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleListener
`phaseEnded, phaseStarted, stepEnded, stepStarted`

Methods inherited from interface org.optaplanner.core.impl.solver.event.SolverLifecycleListener
`solvingEnded, solvingStarted`

Method Detail

### isContinuous

    boolean isContinuous()

  If true, then `isNeverEnding()` is also true.

  Returns:
    true if any of the value ranges are continuous (as in for example every double value between 1.2 and 1.4)

### isNeverEnding

    boolean isNeverEnding()

  Is true if `isContinuous()` is true 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.

### getCacheType

    SelectionCacheType getCacheType()

  Unless this selector itself caches, this returns `SelectionCacheType.JUST_IN_TIME`, even if a selector child caches.

  Returns:
    never null

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