Package ai.timefold.solver.core.impl.domain.variable.inverserelation

Class SingletonListInverseVariableListener<Solution_>

java.lang.Object

ai.timefold.solver.core.impl.domain.variable.inverserelation.SingletonListInverseVariableListener<Solution_>

All Implemented Interfaces:

AbstractVariableListener<Solution_,Object>, ListVariableListener<Solution_,Object,Object>, SingletonInverseVariableSupply, Supply, Closeable, AutoCloseable

public class SingletonListInverseVariableListener<Solution_>
extends Object
implements ListVariableListener<Solution_,Object,Object>, SingletonInverseVariableSupply

Field Summary

Fields

Modifier and Type	Field	Description
protected InverseRelationShadowVariableDescriptor<Solution_>	shadowVariableDescriptor
protected ListVariableDescriptor<Solution_>	sourceVariableDescriptor

Constructor Summary

Constructors

Constructor	Description
SingletonListInverseVariableListener(InverseRelationShadowVariableDescriptor<Solution_> shadowVariableDescriptor, ListVariableDescriptor<Solution_> sourceVariableDescriptor)

Method Summary

Modifier and Type	Method	Description
void	afterEntityAdded(ScoreDirector<Solution_> scoreDirector, Object entity)
void	afterEntityRemoved(ScoreDirector<Solution_> scoreDirector, Object entity)
void	afterListVariableChanged(ScoreDirector<Solution_> scoreDirector, Object entity, int fromIndex, int toIndex)	Tells the listener that some elements within the range starting at fromIndex (inclusive) and ending at toIndex (exclusive) changed.
void	afterListVariableElementUnassigned(ScoreDirector<Solution_> scoreDirector, Object element)	The listener must unset all shadow variables it is responsible for when an element is unassigned from the source list variable.
void	beforeEntityAdded(ScoreDirector<Solution_> scoreDirector, Object entity)
void	beforeEntityRemoved(ScoreDirector<Solution_> scoreDirector, Object entity)
void	beforeListVariableChanged(ScoreDirector<Solution_> scoreDirector, Object entity, int fromIndex, int toIndex)	Tells the listener that some elements within the range starting at fromIndex (inclusive) and ending at toIndex (exclusive) will change.
Object	getInverseSingleton(Object planningValue)	If entity1.varA = x then the inverse of x is entity1.

Methods inherited from class java.lang.Object

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

Methods inherited from interface ai.timefold.solver.core.api.domain.variable.AbstractVariableListener

close, resetWorkingSolution

Field Detail

shadowVariableDescriptor

protected final InverseRelationShadowVariableDescriptor<Solution_> shadowVariableDescriptor

sourceVariableDescriptor

protected final ListVariableDescriptor<Solution_> sourceVariableDescriptor

Constructor Detail

SingletonListInverseVariableListener

public SingletonListInverseVariableListener(InverseRelationShadowVariableDescriptor<Solution_> shadowVariableDescriptor,
                                            ListVariableDescriptor<Solution_> sourceVariableDescriptor)

Method Detail

beforeEntityAdded

public void beforeEntityAdded(ScoreDirector<Solution_> scoreDirector,
                              Object entity)

Specified by:

beforeEntityAdded in interface AbstractVariableListener<Solution_,Object>

Parameters:

scoreDirector - never null

entity - never null

afterEntityAdded

public void afterEntityAdded(ScoreDirector<Solution_> scoreDirector,
                             Object entity)

Specified by:

afterEntityAdded in interface AbstractVariableListener<Solution_,Object>

Parameters:

scoreDirector - never null

entity - never null

beforeEntityRemoved

public void beforeEntityRemoved(ScoreDirector<Solution_> scoreDirector,
                                Object entity)

Specified by:

beforeEntityRemoved in interface AbstractVariableListener<Solution_,Object>

Parameters:

scoreDirector - never null

entity - never null

afterEntityRemoved

public void afterEntityRemoved(ScoreDirector<Solution_> scoreDirector,
                               Object entity)

Specified by:

afterEntityRemoved in interface AbstractVariableListener<Solution_,Object>

Parameters:

scoreDirector - never null

entity - never null

afterListVariableElementUnassigned

public void afterListVariableElementUnassigned(ScoreDirector<Solution_> scoreDirector,
                                               Object element)

Description copied from interface: ListVariableListener

The listener must unset all shadow variables it is responsible for when an element is unassigned from the source list variable. For example, a Task's startTime shadow variable must be reset to null after a task is unassigned from Employee.tasks when the move that assigned it there is undone during Construction Heuristic phase.

Specified by:

afterListVariableElementUnassigned in interface ListVariableListener<Solution_,Object,Object>

Parameters:

scoreDirector - score director

element - the unassigned element

beforeListVariableChanged

public void beforeListVariableChanged(ScoreDirector<Solution_> scoreDirector,
                                      Object entity,
                                      int fromIndex,
                                      int toIndex)

Description copied from interface: ListVariableListener

Tells the listener that some elements within the range starting at fromIndex (inclusive) and ending at toIndex (exclusive) will change. Be aware that the ListVariableListener.afterListVariableChanged(ai.timefold.solver.core.api.score.director.ScoreDirector<Solution_>, Entity_, int, int) call after the change is done often has a different fromIndex and toIndex because the number of elements in the list variable can change.

The list variable change includes:

• Changing position (index) of one or more elements.
• Removing one or more elements from the list variable.
• Adding one or more elements to the list variable.
• Any mix of the above.
The range has the following properties:

fromIndex is greater than or equal to 0; toIndex is less than or equal to the list variable size. toIndex is greater than or equal to fromIndex. The range contains all elements that are going to be changed. The range may contain elements that are not going to be changed. The range may be empty (fromIndex equals toIndex) if none of the existing list variable elements are going to be changed.

Specified by:

beforeListVariableChanged in interface ListVariableListener<Solution_,Object,Object>

Parameters:

scoreDirector - score director

entity - entity with the changed list variable

fromIndex - low endpoint (inclusive) of the changed range

toIndex - high endpoint (exclusive) of the changed range

afterListVariableChanged

public void afterListVariableChanged(ScoreDirector<Solution_> scoreDirector,
                                     Object entity,
                                     int fromIndex,
                                     int toIndex)

Description copied from interface: ListVariableListener

Tells the listener that some elements within the range starting at fromIndex (inclusive) and ending at toIndex (exclusive) changed.

The list variable change includes:

• Changing position (index) of one or more elements.
• Removing one or more elements from the list variable.
• Adding one or more elements to the list variable.
• Any mix of the above.
The range has the following properties:

fromIndex is greater than or equal to 0; toIndex is less than or equal to the list variable size. toIndex is greater than or equal to fromIndex. The range contains all elements that have changed. The range may contain elements that have not changed. The range may be empty (fromIndex equals toIndex) if none of the existing list variable elements have changed.

Specified by:

afterListVariableChanged in interface ListVariableListener<Solution_,Object,Object>

Parameters:

scoreDirector - score director

entity - entity with the changed list variable

fromIndex - low endpoint (inclusive) of the changed range

toIndex - high endpoint (exclusive) of the changed range

getInverseSingleton

public Object getInverseSingleton(Object planningValue)

Description copied from interface: SingletonInverseVariableSupply

If entity1.varA = x then the inverse of x is entity1.

Specified by:

getInverseSingleton in interface SingletonInverseVariableSupply

Parameters:

planningValue - never null

Returns:

sometimes null, an entity for which the planning variable is the planningValue.