Package org.optaplanner.core.api.solver.change

Interface ProblemChangeDirector

All Known Implementing Classes:

DefaultProblemChangeDirector, MockProblemChangeDirector

public interface ProblemChangeDirector

Allows external changes to the working solution. If the changes are not applied through the ProblemChangeDirector, both internal and custom variable listeners are never notified about them, resulting to inconsistencies in the working solution. Should be used only from a ProblemChange implementation. To see an example implementation, please refer to the ProblemChange Javadoc.

Method Summary

Modifier and Type	Method	Description
<Entity> void	addEntity(Entity entity, Consumer<Entity> entityConsumer)	Add a new PlanningEntity instance into the working solution.
<ProblemFact> void	addProblemFact(ProblemFact problemFact, Consumer<ProblemFact> problemFactConsumer)	Add a new problem fact into the working solution.
<EntityOrProblemFact> void	changeProblemProperty(EntityOrProblemFact problemFactOrEntity, Consumer<EntityOrProblemFact> problemFactOrEntityConsumer)	Change a property of either a PlanningEntity or a problem fact.
<Entity> void	changeVariable(Entity entity, String variableName, Consumer<Entity> entityConsumer)	Change a PlanningVariable value of a PlanningEntity.
<EntityOrProblemFact> Optional<EntityOrProblemFact>	lookUpWorkingObject(EntityOrProblemFact externalObject)	As defined by lookUpWorkingObjectOrFail(Object), but doesn't fail fast if no workingObject was ever added for the externalObject.
<EntityOrProblemFact> EntityOrProblemFact	lookUpWorkingObjectOrFail(EntityOrProblemFact externalObject)	Translate an entity or fact instance (often from another Thread or JVM) to this ProblemChangeDirector's internal working instance.
<Entity> void	removeEntity(Entity entity, Consumer<Entity> entityConsumer)	Remove an existing PlanningEntity instance from the working solution.
<ProblemFact> void	removeProblemFact(ProblemFact problemFact, Consumer<ProblemFact> problemFactConsumer)	Remove an existing problem fact from the working solution.

Method Detail

addEntity

<Entity> void addEntity(Entity entity,
                        Consumer<Entity> entityConsumer)

Add a new PlanningEntity instance into the working solution.

Type Parameters:

Entity - the planning entity object type

Parameters:

entity - never null; the PlanningEntity instance

entityConsumer - never null; adds the entity to the working solution

removeEntity

<Entity> void removeEntity(Entity entity,
                           Consumer<Entity> entityConsumer)

Remove an existing PlanningEntity instance from the working solution. Translates the entity to a working planning entity by performing a lookup as defined by lookUpWorkingObjectOrFail(Object).

Type Parameters:

Entity - the planning entity object type

Parameters:

entity - never null; the PlanningEntity instance

entityConsumer - never null; removes the working entity from the working solution

changeVariable

<Entity> void changeVariable(Entity entity,
                             String variableName,
                             Consumer<Entity> entityConsumer)

Change a PlanningVariable value of a PlanningEntity. Translates the entity to a working planning entity by performing a lookup as defined by lookUpWorkingObjectOrFail(Object).

Type Parameters:

Entity - the planning entity object type

Parameters:

entity - never null; the PlanningEntity instance

variableName - never null; name of the PlanningVariable

entityConsumer - never null; updates the value of the PlanningVariable inside the PlanningEntity

addProblemFact

<ProblemFact> void addProblemFact(ProblemFact problemFact,
                                  Consumer<ProblemFact> problemFactConsumer)

Add a new problem fact into the working solution.

Type Parameters:

ProblemFact - the problem fact object type

Parameters:

problemFact - never null; the problem fact instance

problemFactConsumer - never null; removes the working problem fact from the working solution

removeProblemFact

<ProblemFact> void removeProblemFact(ProblemFact problemFact,
                                     Consumer<ProblemFact> problemFactConsumer)

Remove an existing problem fact from the working solution. Translates the problem fact to a working problem fact by performing a lookup as defined by lookUpWorkingObjectOrFail(Object).

Type Parameters:

ProblemFact - the problem fact object type

Parameters:

problemFact - never null; the problem fact instance

problemFactConsumer - never null; removes the working problem fact from the working solution

changeProblemProperty

<EntityOrProblemFact> void changeProblemProperty(EntityOrProblemFact problemFactOrEntity,
                                                 Consumer<EntityOrProblemFact> problemFactOrEntityConsumer)

Change a property of either a PlanningEntity or a problem fact. Translates the entity or the problem fact to its working solution counterpart by performing a lookup as defined by lookUpWorkingObjectOrFail(Object).

Type Parameters:

EntityOrProblemFact - the planning entity or problem fact object type

Parameters:

problemFactOrEntity - never null; the PlanningEntity or the problem fact instance

problemFactOrEntityConsumer - never null; updates the property of the PlanningEntity or the problem fact

lookUpWorkingObjectOrFail

<EntityOrProblemFact> EntityOrProblemFact lookUpWorkingObjectOrFail(EntityOrProblemFact externalObject)

Translate an entity or fact instance (often from another Thread or JVM) to this ProblemChangeDirector's internal working instance.

Matching is determined by the LookUpStrategyType on PlanningSolution. Matching uses a PlanningId by default.

Type Parameters:

EntityOrProblemFact - the object type

Parameters:

externalObject - sometimes null

Returns:

null if externalObject is null

Throws:

IllegalArgumentException - if there is no workingObject for externalObject, if it cannot be looked up or if the externalObject's class is not supported

IllegalStateException - if it cannot be looked up

lookUpWorkingObject

<EntityOrProblemFact> Optional<EntityOrProblemFact> lookUpWorkingObject(EntityOrProblemFact externalObject)

As defined by lookUpWorkingObjectOrFail(Object), but doesn't fail fast if no workingObject was ever added for the externalObject. It's recommended to use lookUpWorkingObjectOrFail(Object) instead.

Type Parameters:

EntityOrProblemFact - the object type

Parameters:

externalObject - sometimes null

Returns:

Optional.empty() if externalObject is null or if there is no workingObject for externalObject

Throws:

IllegalArgumentException - if it cannot be looked up or if the externalObject's class is not supported

IllegalStateException - if it cannot be looked up