org.drools.planner.core.heuristic.selector.move.composite
Class CartesianProductMoveSelector

java.lang.Object
  org.drools.planner.core.heuristic.selector.AbstractSelector
      org.drools.planner.core.heuristic.selector.move.AbstractMoveSelector
          org.drools.planner.core.heuristic.selector.move.composite.CompositeMoveSelector
              org.drools.planner.core.heuristic.selector.move.composite.CartesianProductMoveSelector

All Implemented Interfaces:

Iterable<Move>, EventListener, MoveSelector, Selector, SolverPhaseLifecycleListener, SolverLifecycleListener

public class CartesianProductMoveSelector
extends CompositeMoveSelector

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

class	CartesianProductMoveSelector.OriginalCartesianProductMoveIterator
class	CartesianProductMoveSelector.RandomCartesianProductMoveIterator

Field Summary

Fields inherited from class org.drools.planner.core.heuristic.selector.move.composite.CompositeMoveSelector

childMoveSelectorList, randomSelection

Fields inherited from class org.drools.planner.core.heuristic.selector.AbstractSelector

logger, solverPhaseLifecycleSupport, workingRandom

Constructor Summary

CartesianProductMoveSelector(List<MoveSelector> childMoveSelectorList, 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.isContinuous() is true or if this selector is in random order (for most cases).
Iterator<Move>	iterator()
String	toString()

Methods inherited from class org.drools.planner.core.heuristic.selector.move.composite.CompositeMoveSelector

isContinuous

Methods inherited from class org.drools.planner.core.heuristic.selector.AbstractSelector

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.drools.planner.core.phase.event.SolverPhaseLifecycleListener

phaseEnded, phaseStarted, stepEnded, stepStarted

Methods inherited from interface org.drools.planner.core.solver.event.SolverLifecycleListener

solvingEnded, solvingStarted

Constructor Detail

CartesianProductMoveSelector

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

Method Detail

isNeverEnding

public boolean isNeverEnding()

Description copied from interface: Selector

Is true if Selector.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.

getSize

public long getSize()

Description copied from interface: Selector

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