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## org.optaplanner.core.impl.heuristic.selector.move.composite
Class CartesianProductMoveSelector

    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.CartesianProductMoveSelector

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

    public class CartesianProductMoveSelector

extends CompositeMoveSelector

A `CompositeMoveSelector` that cartesian products 2 or more `MoveSelector`s.

For example: a cartesian product of {A, B, C} and {X, Y} will result in {AX, AY, BX, BY, CX, CY}.

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

See Also:
  `CompositeMoveSelector`

Nested Class Summary
`class` | `CartesianProductMoveSelector.OriginalCartesianProductMoveIterator`
`class` | `CartesianProductMoveSelector.RandomCartesianProductMoveIterator`

Field Summary

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
`CartesianProductMoveSelector(List<MoveSelector> childMoveSelectorList, boolean ignoreEmptyChildIterators, boolean randomSelection)`

Method Summary
`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()`
`String` | `toString()`

Methods inherited from class org.optaplanner.core.impl.heuristic.selector.move.composite.CompositeMoveSelector
`isCountable`

Methods inherited from class org.optaplanner.core.impl.heuristic.selector.AbstractSelector
`getCacheType, 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.heuristic.selector.Selector
`getCacheType`

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`

Constructor Detail

### CartesianProductMoveSelector

    public CartesianProductMoveSelector(List<MoveSelector> childMoveSelectorList,
                                        boolean ignoreEmptyChildIterators,
                                        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).

### 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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