Package org.optaplanner.core.impl.heuristic.selector.entity

Class FromSolutionEntitySelector

java.lang.Object

org.optaplanner.core.impl.heuristic.selector.AbstractSelector

org.optaplanner.core.impl.heuristic.selector.entity.AbstractEntitySelector

org.optaplanner.core.impl.heuristic.selector.entity.FromSolutionEntitySelector

All Implemented Interfaces:

Iterable<Object>, EventListener, ListIterable<Object>, EntitySelector, IterableSelector<Object>, ListIterableSelector<Object>, Selector, PhaseLifecycleListener, SolverLifecycleListener

public class FromSolutionEntitySelector
extends AbstractEntitySelector

This is the common EntitySelector implementation.

Field Summary

Fields

Modifier and Type	Field	Description
protected List<Object>	cachedEntityList
protected boolean	cachedEntityListIsDirty
protected Long	cachedEntityListRevision
protected EntityDescriptor	entityDescriptor
protected SelectionCacheType	minimumCacheType
protected boolean	randomSelection

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

logger, phaseLifecycleSupport, workingRandom

Constructor Summary

Constructors

Constructor	Description
FromSolutionEntitySelector(EntityDescriptor entityDescriptor, SelectionCacheType minimumCacheType, boolean randomSelection)

Method Summary

Modifier and Type	Method	Description
Iterator<Object>	endingIterator()	If Selector.isNeverEnding() is true, then Iterable.iterator() will never end.
SelectionCacheType	getCacheType()	Unless this selector itself caches, this returns SelectionCacheType.JUST_IN_TIME, even if a selector child caches.
EntityDescriptor	getEntityDescriptor()
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<Object>	iterator()
ListIterator<Object>	listIterator()
ListIterator<Object>	listIterator(int index)
void	phaseEnded(AbstractPhaseScope phaseScope)
void	phaseStarted(AbstractPhaseScope phaseScope)
void	stepStarted(AbstractStepScope stepScope)
String	toString()

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

solvingEnded, solvingStarted, stepEnded

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, spliterator

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

stepEnded

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

solvingEnded, solvingStarted

Field Detail

entityDescriptor

protected final EntityDescriptor entityDescriptor

minimumCacheType

protected final SelectionCacheType minimumCacheType

randomSelection

protected final boolean randomSelection

cachedEntityList

protected List<Object> cachedEntityList

cachedEntityListRevision

protected Long cachedEntityListRevision

cachedEntityListIsDirty

protected boolean cachedEntityListIsDirty

Constructor Detail

FromSolutionEntitySelector

public FromSolutionEntitySelector(EntityDescriptor entityDescriptor,
                                  SelectionCacheType minimumCacheType,
                                  boolean randomSelection)

Method Detail

getEntityDescriptor

public EntityDescriptor getEntityDescriptor()

Returns:

never null

getCacheType

public SelectionCacheType getCacheType()

Description copied from interface: Selector

Unless this selector itself caches, this returns SelectionCacheType.JUST_IN_TIME, even if a selector child caches.

Specified by:

getCacheType in interface Selector

Overrides:

getCacheType in class AbstractSelector

Returns:

never null, at least SelectionCacheType.STEP

phaseStarted

public void phaseStarted(AbstractPhaseScope phaseScope)

Specified by:

phaseStarted in interface PhaseLifecycleListener

Overrides:

phaseStarted in class AbstractSelector

stepStarted

public void stepStarted(AbstractStepScope stepScope)

Specified by:

stepStarted in interface PhaseLifecycleListener

Overrides:

stepStarted in class AbstractSelector

phaseEnded

public void phaseEnded(AbstractPhaseScope phaseScope)

Specified by:

phaseEnded in interface PhaseLifecycleListener

Overrides:

phaseEnded 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<Object> iterator()

listIterator

public ListIterator<Object> listIterator()

Returns:

never null, see List.listIterator().

See Also:

List.listIterator()

listIterator

public ListIterator<Object> listIterator(int index)

Parameters:

index - lower than the size of this ListIterable, see List.listIterator(int).

Returns:

never null, see List.listIterator(int).

See Also:

List.listIterator()

endingIterator

public Iterator<Object> endingIterator()

Description copied from interface: EntitySelector

If Selector.isNeverEnding() is true, then Iterable.iterator() will never end. This returns an ending Iterator, that tries to match Iterable.iterator() as much as possible, but returns each distinct element only once and returns every element that might possibly be selected and therefore it might not respect the configuration of this EntitySelector entirely.

Returns:

never null

See Also:

Iterable.iterator()

toString

public String toString()

Overrides:

toString in class Object