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

Class CartesianProductMoveSelector<Solution_>

java.lang.Object

org.optaplanner.core.impl.heuristic.selector.AbstractSelector<Solution_>

org.optaplanner.core.impl.heuristic.selector.move.AbstractMoveSelector<Solution_>

org.optaplanner.core.impl.heuristic.selector.move.composite.CompositeMoveSelector<Solution_>

org.optaplanner.core.impl.heuristic.selector.move.composite.CartesianProductMoveSelector<Solution_>

All Implemented Interfaces:

Iterable<Move<Solution_>>, EventListener, IterableSelector<Solution_,Move<Solution_>>, MoveSelector<Solution_>, Selector<Solution_>, PhaseLifecycleListener<Solution_>, SolverLifecycleListener<Solution_>

public class CartesianProductMoveSelector<Solution_>
extends CompositeMoveSelector<Solution_>

A CompositeMoveSelector that Cartesian products 2 or more MoveSelectors.

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

Nested Classes

Modifier and Type	Class	Description
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

Constructors

Constructor	Description
CartesianProductMoveSelector(List<MoveSelector<Solution_>> childMoveSelectorList, boolean ignoreEmptyChildIterators, boolean randomSelection)

Method Summary

Modifier and Type	Method	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<Solution_>>	iterator()
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, stepEnded, stepStarted

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface org.optaplanner.core.impl.heuristic.selector.IterableSelector

spliterator

Methods inherited from interface org.optaplanner.core.impl.phase.event.PhaseLifecycleListener

phaseEnded, phaseStarted, stepEnded, stepStarted

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

getCacheType

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

solvingEnded, solvingError, solvingStarted

Constructor Details

CartesianProductMoveSelector

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

Method Details

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<Solution_>> iterator()

toString

public String toString()

Overrides:

toString in class CompositeMoveSelector<Solution_>