Package org.optaplanner.core.impl.heuristic.selector.value.decorator

Class DowncastingValueSelector

java.lang.Object

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

org.optaplanner.core.impl.heuristic.selector.value.AbstractValueSelector

org.optaplanner.core.impl.heuristic.selector.value.decorator.DowncastingValueSelector

All Implemented Interfaces:

EventListener, Selector, ValueSelector, PhaseLifecycleListener, SolverLifecycleListener

public class DowncastingValueSelector
extends AbstractValueSelector

Field Summary

Fields

Modifier and Type	Field	Description
protected ValueSelector	childValueSelector
protected Class<?>	downcastEntityClass

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

logger, phaseLifecycleSupport, workingRandom

Constructor Summary

Constructors

Constructor	Description
DowncastingValueSelector(ValueSelector childValueSelector, Class<?> downcastEntityClass)

Method Summary

Modifier and Type	Method	Description
Iterator<Object>	endingIterator(Object entity)	If Selector.isNeverEnding() is true, then ValueSelector.iterator(Object) will never end.
ValueSelector	getChildValueSelector()
long	getSize(Object entity)	Similar to IterableSelector.getSize(), but requires an entity.
GenuineVariableDescriptor	getVariableDescriptor()
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(Object entity)	Similar to Iterable.iterator(), but requires an entity.
String	toString()

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.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, solvingStarted

Field Detail

childValueSelector

protected final ValueSelector childValueSelector

downcastEntityClass

protected final Class<?> downcastEntityClass

Constructor Detail

DowncastingValueSelector

public DowncastingValueSelector(ValueSelector childValueSelector,
                                Class<?> downcastEntityClass)

Method Detail

getChildValueSelector

public ValueSelector getChildValueSelector()

getVariableDescriptor

public GenuineVariableDescriptor getVariableDescriptor()

Returns:

never null

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(Object entity)

Description copied from interface: ValueSelector

Similar to IterableSelector.getSize(), but requires an entity.

Parameters:

entity - never null

Returns:

the approximate number of elements generated by this Selector, always >= 0

iterator

public Iterator<Object> iterator(Object entity)

Description copied from interface: ValueSelector

Similar to Iterable.iterator(), but requires an entity.

Parameters:

entity - never null

Returns:

never null

endingIterator

public Iterator<Object> endingIterator(Object entity)

Description copied from interface: ValueSelector

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

Parameters:

entity - never null

Returns:

never null

See Also:

ValueSelector.iterator(Object)

toString

public String toString()

Overrides:

toString in class Object