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.actions.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.ActionInvokedEvent;
027import org.apache.isis.core.metamodel.facets.actions.invoke.ActionInvocationFacet;
028
029/**
030 * Extends the mechanism by which the action should be invoked by sending an
031 * Event to the internal Event Bus after being invoked without throwing 
032 * an Exception.
033 */
034public interface PostsActionInvokedEventFacet extends ActionInvocationFacet {
035
036    public static class Util {
037        private Util(){}
038        
039        @SuppressWarnings("unchecked")
040        public static <S> ActionInvokedEvent<S> newEvent(
041                    final Class<? extends ActionInvokedEvent<S>> type, 
042                    final S source, 
043                    final Identifier identifier, 
044                    final Object... arguments) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {
045            final Constructor<?>[] constructors = type.getConstructors();
046            for (final Constructor<?> constructor : constructors) {
047                final Class<?>[] parameterTypes = constructor.getParameterTypes();
048                if(parameterTypes.length != 3) {
049                    continue;
050                }
051                if(!parameterTypes[0].isAssignableFrom(source.getClass())) {
052                    continue;
053                }
054                if(!parameterTypes[1].isAssignableFrom(Identifier.class)) {
055                    continue;
056                }
057                if(!parameterTypes[2].isAssignableFrom(Object[].class)) {
058                    continue;
059                }
060                final Object event = constructor.newInstance(source, identifier, arguments);
061                return (ActionInvokedEvent<S>) event;
062            }
063            throw new NoSuchMethodException(type.getName()+".<init>(? super " + source.getClass().getName() + ", " + Identifier.class.getName() + ", [Ljava.lang.Object;)");
064        }
065    }
066}