org.eclipse.ocl.examples.impactanalyzer.impl
Class DerivedPropertyNotifierImpl

java.lang.Object
  org.eclipse.ocl.examples.impactanalyzer.impl.DerivedPropertyNotifierImpl

All Implemented Interfaces:

DerivedPropertyNotifier

public class DerivedPropertyNotifierImpl
extends java.lang.Object
implements DerivedPropertyNotifier

Used to observe and filter for model changes that affect derived properties defined by OCL expression. Construct an instance for a single EStructuralFeature or all properties of an EPackage and subscribe for change notifications at an EventManager. When changes affecting a derived property's value are received, the actual changes are determined, and new Notifications are created for those objects on which the derived property's value did change.

To achieve this service, this class makes use of an ImpactAnalyzer for each derivation expression. This allows us to construct event filters catching the subset of change notifications which may affect the derivation expression's value. The ImpactAnalyzer is then used to further reduce the number of possible context objects on which to check for actual changes. The changes observed are then assembled into an according change Notification for the derived property itself and forwarded by calling Notifier.eNotify(Notification) on the object where it changed.

Author:

Martin Hanysz, Axel Uhl

Constructor Summary

DerivedPropertyNotifierImpl(ActivationOption impactAnalyzerConfiguration, OppositeEndFinder oppositeEndFinder, OCLFactory oclFactory, org.eclipse.emf.ecore.EPackage pkg)

DerivedPropertyNotifierImpl(ActivationOption impactAnalyzerConfiguration, OppositeEndFinder oppositeEndFinder, OCLFactory oclFactory, org.eclipse.emf.ecore.EStructuralFeature... derivedProperties)

Method Summary

void	subscribe(EventManager eventManager) Activates the services of this notifier for the scope observed by the eventManager.
void	unsubscribe(EventManager eventManager) Deactivates this notifier by unregistering all its internal adapters from the eventManager again.

Methods inherited from class java.lang.Object

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

Constructor Detail

DerivedPropertyNotifierImpl

public DerivedPropertyNotifierImpl(ActivationOption impactAnalyzerConfiguration,
                                   OppositeEndFinder oppositeEndFinder,
                                   OCLFactory oclFactory,
                                   org.eclipse.emf.ecore.EPackage pkg)

DerivedPropertyNotifierImpl

public DerivedPropertyNotifierImpl(ActivationOption impactAnalyzerConfiguration,
                                   OppositeEndFinder oppositeEndFinder,
                                   OCLFactory oclFactory,
                                   org.eclipse.emf.ecore.EStructuralFeature... derivedProperties)

Method Detail

subscribe

public void subscribe(EventManager eventManager)

Description copied from interface: DerivedPropertyNotifier

Activates the services of this notifier for the scope observed by the eventManager. If the event manager is set inactive, no notifications are created by this notifier until the event manager is activated again.

Specified by:

subscribe in interface DerivedPropertyNotifier

unsubscribe

public void unsubscribe(EventManager eventManager)

Description copied from interface: DerivedPropertyNotifier

Deactivates this notifier by unregistering all its internal adapters from the eventManager again.

Specified by:

unsubscribe in interface DerivedPropertyNotifier