/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.isis.core.metamodel.facets.collections.interaction;
import java.util.Set;
import org.apache.isis.applib.services.eventbus.AbstractInteractionEvent;
import org.apache.isis.applib.services.eventbus.CollectionInteractionEvent;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.facetapi.Facet;
import org.apache.isis.core.metamodel.facetapi.FacetHolder;
import org.apache.isis.core.metamodel.facets.InteractionHelper;
import org.apache.isis.core.metamodel.facets.SingleValueFacetAbstract;
import org.apache.isis.core.metamodel.facets.collections.modify.CollectionAddToFacet;
import org.apache.isis.core.metamodel.facets.propcoll.accessor.PropertyOrCollectionAccessorFacet;
import org.apache.isis.core.metamodel.runtimecontext.ServicesInjector;
public abstract class CollectionAddToFacetForInteractionAbstract
extends SingleValueFacetAbstract<Class<? extends CollectionInteractionEvent<?,?>>>
implements CollectionAddToFacet {
private final InteractionHelper interactionHelper;
public static Class<? extends Facet> type() {
return CollectionAddToFacet.class;
}
private final PropertyOrCollectionAccessorFacet getterFacet;
private final CollectionAddToFacet collectionAddToFacet;
private final CollectionInteractionFacetAbstract collectionInteractionFacet;
public CollectionAddToFacetForInteractionAbstract(
final Class<? extends CollectionInteractionEvent<?, ?>> eventType,
final PropertyOrCollectionAccessorFacet getterFacet,
final CollectionAddToFacet collectionAddToFacet,
final CollectionInteractionFacetAbstract collectionInteractionFacet,
final ServicesInjector servicesInjector,
final FacetHolder holder) {
super(type(), eventType, holder);
this.getterFacet = getterFacet;
this.collectionAddToFacet = collectionAddToFacet;
this.collectionInteractionFacet = collectionInteractionFacet;
this.interactionHelper = new InteractionHelper(servicesInjector);
}
@Override
public void add(
final ObjectAdapter targetAdapter,
final ObjectAdapter referencedObjectAdapter) {
if (this.collectionAddToFacet == null) {
return;
}
if(!interactionHelper.hasEventBusService()) {
collectionAddToFacet.add(targetAdapter, referencedObjectAdapter);
return;
}
try {
final Object referencedObject = ObjectAdapter.Util.unwrap(referencedObjectAdapter);
// get hold of underlying collection
final Object collection = getterFacet.getProperty(targetAdapter);
// don't post event if has set semantics and already contains object
if(collection instanceof Set) {
Set<?> set = (Set<?>) collection;
if(set.contains(referencedObject)) {
return;
}
}
// either doesn't contain object, or doesn't have set semantics, so
// execute the add wrapped between the executing and executed events ...
// pick up existing event (saved in thread local during the validation phase)
final CollectionInteractionEvent<?, ?> existingEvent = collectionInteractionFacet.currentInteraction.get();
// ... post the executing event
final CollectionInteractionEvent<?, ?> event = interactionHelper.postEventForCollection(
value(), existingEvent, AbstractInteractionEvent.Phase.EXECUTING,
getIdentified(), targetAdapter, CollectionInteractionEvent.Of.ADD_TO, referencedObject);
// ... perform add
collectionAddToFacet.add(targetAdapter, referencedObjectAdapter);
// ... post the executed event
interactionHelper.postEventForCollection(
value(), verify(event), AbstractInteractionEvent.Phase.EXECUTED,
getIdentified(), targetAdapter, CollectionInteractionEvent.Of.ADD_TO, referencedObject);
} finally {
// clean up
collectionInteractionFacet.currentInteraction.set(null);
}
}
/**
* Optional hook to allow the facet implementation for the deprecated {@link org.apache.isis.applib.annotation.PostsCollectionAddedToEvent} annotation
* to discard the event if of a different type.
*/
protected CollectionInteractionEvent<?, ?> verify(CollectionInteractionEvent<?, ?> event) {
return event;
}
}