001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.metamodel.facets.collections.event;
021
022import java.lang.reflect.Constructor;
023import java.lang.reflect.InvocationTargetException;
024
025import org.apache.isis.applib.Identifier;
026import org.apache.isis.applib.services.eventbus.CollectionAddedToEvent;
027import org.apache.isis.applib.services.eventbus.EventBusService;
028import org.apache.isis.applib.services.eventbus.PropertyChangedEvent;
029import org.apache.isis.core.metamodel.facetapi.MultiTypedFacet;
030import org.apache.isis.core.metamodel.facets.SingleValueFacet;
031import org.apache.isis.core.metamodel.facets.collections.modify.CollectionAddToFacet;
032
033/**
034 * Indicates that (the specified subclass of) {@link CollectionAddedToEvent} should be posted to the
035 * {@link EventBusService}.
036 */
037public interface PostsCollectionAddedToEventFacet extends SingleValueFacet<Class<? extends CollectionAddedToEvent<?,?>>>, CollectionAddToFacet, MultiTypedFacet {
038    
039    public static class Util {
040        private Util(){}
041        
042        @SuppressWarnings("unchecked")
043        public static <S, T> CollectionAddedToEvent<S, T> newEvent(
044                final Class<? extends CollectionAddedToEvent<S, T>> type,
045                final S source, 
046                final Identifier identifier,
047                final T value) throws NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
048            final Constructor<?>[] constructors = type.getConstructors();
049            for (final Constructor<?> constructor : constructors) {
050                final Class<?>[] parameterTypes = constructor.getParameterTypes();
051                if(parameterTypes.length != 3) {
052                    continue;
053                }
054                if(!parameterTypes[0].isAssignableFrom(source.getClass())) {
055                    continue;
056                }
057                if(!parameterTypes[1].isAssignableFrom(Identifier.class)) {
058                    continue;
059                }
060                if(value != null && !parameterTypes[2].isAssignableFrom(value.getClass())) {
061                    continue;
062                }
063                final Object event = constructor.newInstance(source, identifier, value);
064                return (CollectionAddedToEvent<S, T>) event;
065            }
066            throw new NoSuchMethodException(type.getName()+".<init>(? super " + source.getClass().getName() + ", " + Identifier.class.getName() + ", java.lang.Object)");
067        }
068
069    }
070}
071