org.axonframework.eventsourcing.annotation
Class AggregateAnnotationInspector

java.lang.Object
  org.axonframework.eventsourcing.annotation.AggregateAnnotationInspector

public final class AggregateAnnotationInspector
extends Object

Inspects objects to find aggregate specific annotations, such as AggregateIdentifier and EventSourcedMember. The inspector can also create AnnotationEventHandlerInvoker instances to invoke EventHandler annotated methods.

Since:

2.0

Author:

Allard Buijze

Method Summary

AnnotationEventHandlerInvoker	createEventHandlerInvoker(Object instance) Creates a new EventHandlerInvoker that invokes methods on the given instance.
Collection<EventSourcedEntity>	getChildEntities(Object instance) Returns the child entities of given instance.
<I> I	getIdentifier(AbstractAnnotatedAggregateRoot<I> aggregateRoot) Returns the identifier of the given aggregateRoot.
static AggregateAnnotationInspector	getInspector(Class<?> entityType) Returns (or creates) an inspector for the given entityType.

Methods inherited from class java.lang.Object

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

Method Detail

getInspector

public static AggregateAnnotationInspector getInspector(Class<?> entityType)

Returns (or creates) an inspector for the given entityType. If an instance is already created for that type, that instance may be returned. Otherwise, a new inspector is created.

Parameters:

entityType - The type of entity (aggregate root or simple member) to get an inspector for

Returns:

an inspector for the given entity type

createEventHandlerInvoker

public AnnotationEventHandlerInvoker createEventHandlerInvoker(Object instance)

Creates a new EventHandlerInvoker that invokes methods on the given instance.

Parameters:

instance - The object (typically an entity) to create the EventHandlerInvoker for

Returns:

an AnnotationEventHandlerInvoker that invokes annotated methods on given instance

getChildEntities

public Collection<EventSourcedEntity> getChildEntities(Object instance)

Returns the child entities of given instance. Entities are detected if they are contained in fields annotated with EventSourcedMember. If the annotated field is a collection, map or array, each member of that collection, the map's key set, the map's value set or the array that implements the EventSourcedEntity interface is returned.

Parameters:

instance - The instance to find child entities in

Returns:

a collection of child entities found in the given instance.

getIdentifier

public <I> I getIdentifier(AbstractAnnotatedAggregateRoot<I> aggregateRoot)

Returns the identifier of the given aggregateRoot. Since only the aggregate root carries the aggregate's identifier, this method cannot be invoked with any other entity than the aggregate's root.

The field carrying the aggregate identifier must be annotated with AggregateIdentifier.

Type Parameters:

I - The type of identifier declared on the aggregate root

Parameters:

aggregateRoot - The aggregate root to find the aggregate on

Returns:

the value contained in the field annotated with AggregateIdentifier