org.optaplanner.core.impl.heuristic.selector.move.generic

## Class SwapMoveSelector

- java.lang.Object
- - org.optaplanner.core.impl.heuristic.selector.AbstractSelector
  - - org.optaplanner.core.impl.heuristic.selector.move.AbstractMoveSelector
    - - org.optaplanner.core.impl.heuristic.selector.move.generic.GenericMoveSelector
      - - org.optaplanner.core.impl.heuristic.selector.move.generic.SwapMoveSelector

- All Implemented Interfaces:
    Iterable<Move>, EventListener, IterableSelector<Move>, MoveSelector, Selector, PhaseLifecycleListener, SolverLifecycleListener

      public class SwapMoveSelector
      extends GenericMoveSelector

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected boolean` | `anyChained`
    `protected List<SingletonInverseVariableSupply>` | `inverseVariableSupplyList`
    `protected EntitySelector` | `leftEntitySelector`
    `protected boolean` | `randomSelection`
    `protected EntitySelector` | `rightEntitySelector`
    `protected List<GenuineVariableDescriptor>` | `variableDescriptorList`

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

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SwapMoveSelector(EntitySelector leftEntitySelector, EntitySelector rightEntitySelector, List<GenuineVariableDescriptor> variableDescriptorList, boolean randomSelection)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `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`.
    `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<Move>` | `iterator()`
    `void` | `solvingEnded(DefaultSolverScope solverScope)`
    `void` | `solvingStarted(DefaultSolverScope solverScope)`
    `boolean` | `supportsPhaseAndSolverCaching()`
    `String` | `toString()`

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

      `getCacheType, phaseEnded, phaseStarted, 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 java.lang.Iterable

      `forEach, spliterator`

- - ### Field Detail

    - #### leftEntitySelector

          protected final EntitySelector leftEntitySelector

    - #### rightEntitySelector

          protected final EntitySelector rightEntitySelector

    - #### variableDescriptorList

          protected final List<GenuineVariableDescriptor> variableDescriptorList

    - #### randomSelection

          protected final boolean randomSelection

    - #### anyChained

          protected final boolean anyChained

    - #### inverseVariableSupplyList

          protected List<SingletonInverseVariableSupply> inverseVariableSupplyList

  - ### Constructor Detail

    - #### SwapMoveSelector

          public SwapMoveSelector(EntitySelector leftEntitySelector,
                                  EntitySelector rightEntitySelector,
                                  List<GenuineVariableDescriptor> variableDescriptorList,
                                  boolean randomSelection)

  - ### Method Detail

    - #### supportsPhaseAndSolverCaching

          public boolean supportsPhaseAndSolverCaching()

    - #### solvingStarted

          public void solvingStarted(DefaultSolverScope solverScope)

      Specified by:
        `solvingStarted` in interface `SolverLifecycleListener`
      Overrides:
        `solvingStarted` in class `AbstractSelector`

    - #### solvingEnded

          public void solvingEnded(DefaultSolverScope solverScope)

      Specified by:
        `solvingEnded` in interface `SolverLifecycleListener`
      Overrides:
        `solvingEnded` in class `AbstractSelector`

    - #### isCountable

          public boolean isCountable()

      Description copied from interface: `Selector`
      If false, then `Selector.isNeverEnding()` is true.
      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).
      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()

      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`.
      Returns:
        the approximate number of elements generated by this `Selector`, always `>= 0`

    - #### iterator

          public Iterator<Move> iterator()

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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