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

Class TailChainSwapMoveSelector

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.chained.TailChainSwapMoveSelector

All Implemented Interfaces:

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

public class TailChainSwapMoveSelector
extends GenericMoveSelector

Also known as a 2-opt move selector.

Field Summary

Fields

Modifier and Type	Field and Description
protected AnchorVariableSupply	anchorVariableSupply
protected EntitySelector	entitySelector
protected SingletonInverseVariableSupply	inverseVariableSupply
protected boolean	randomSelection
protected ValueSelector	valueSelector

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

logger, phaseLifecycleSupport, workingRandom

Constructor Summary

Constructors

Constructor and Description
TailChainSwapMoveSelector(EntitySelector entitySelector, ValueSelector valueSelector, boolean randomSelection)

Method Summary

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)
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.move.MoveSelector

supportsPhaseAndSolverCaching

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

entitySelector

protected final EntitySelector entitySelector

valueSelector

protected final ValueSelector valueSelector

randomSelection

protected final boolean randomSelection

inverseVariableSupply

protected SingletonInverseVariableSupply inverseVariableSupply

anchorVariableSupply

protected AnchorVariableSupply anchorVariableSupply

Constructor Detail

TailChainSwapMoveSelector

public TailChainSwapMoveSelector(EntitySelector entitySelector,
                                 ValueSelector valueSelector,
                                 boolean randomSelection)

Method Detail

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 ValueRanges 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