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

## Class UnionMoveSelector

- 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.composite.CompositeMoveSelector
      - - org.optaplanner.core.impl.heuristic.selector.move.composite.UnionMoveSelector

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

      public class UnionMoveSelector
      extends CompositeMoveSelector

  A `CompositeMoveSelector` that unions 2 or more `MoveSelector`s.

  For example: a union of {A, B, C} and {X, Y} will result in {A, B, C, X, Y}.

  Warning: there is no duplicated `Move` check, so union of {A, B, C} and {B, D} will result in {A, B, C, B, D}.

  See Also:
    `CompositeMoveSelector`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `class` | `UnionMoveSelector.RandomUnionMoveIterator`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected ScoreDirector` | `scoreDirector`
    `protected SelectionProbabilityWeightFactory` | `selectorProbabilityWeightFactory`

    - ### Fields inherited from class org.optaplanner.core.impl.heuristic.selector.move.composite.CompositeMoveSelector

      `childMoveSelectorList, randomSelection`

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

      `logger, phaseLifecycleSupport, workingRandom`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `UnionMoveSelector(List<MoveSelector> childMoveSelectorList, boolean randomSelection)`
    `UnionMoveSelector(List<MoveSelector> childMoveSelectorList, boolean randomSelection, SelectionProbabilityWeightFactory selectorProbabilityWeightFactory)`

  - ### 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` | `isNeverEnding()` Is true if `Selector.isCountable()` is false or if this selector is in random order (for most cases).
    `Iterator<Move>` | `iterator()`
    `void` | `stepEnded(AbstractStepScope stepScope)`
    `void` | `stepStarted(AbstractStepScope stepScope)`
    `String` | `toString()`

    - ### Methods inherited from class org.optaplanner.core.impl.heuristic.selector.move.composite.CompositeMoveSelector

      `getChildMoveSelectorList, isCountable, supportsPhaseAndSolverCaching`

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

      `getCacheType, phaseEnded, phaseStarted, solvingEnded, solvingStarted`

    - ### 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`

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

      `solvingEnded, solvingStarted`

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

      `forEach, spliterator`

- - ### Field Detail

    - #### selectorProbabilityWeightFactory

          protected final SelectionProbabilityWeightFactory selectorProbabilityWeightFactory

    - #### scoreDirector

          protected ScoreDirector scoreDirector

  - ### Constructor Detail

    - #### UnionMoveSelector

          public UnionMoveSelector(List<MoveSelector> childMoveSelectorList,
                                   boolean randomSelection)

    - #### UnionMoveSelector

          public UnionMoveSelector(List<MoveSelector> childMoveSelectorList,
                                   boolean randomSelection,
                                   SelectionProbabilityWeightFactory selectorProbabilityWeightFactory)

  - ### Method Detail

    - #### stepStarted

          public void stepStarted(AbstractStepScope stepScope)

      Specified by:
        `stepStarted` in interface `PhaseLifecycleListener`
      Overrides:
        `stepStarted` in class `AbstractSelector`

    - #### stepEnded

          public void stepEnded(AbstractStepScope stepScope)

      Specified by:
        `stepEnded` in interface `PhaseLifecycleListener`
      Overrides:
        `stepEnded` in class `AbstractSelector`

    - #### 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 `CompositeMoveSelector`

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