| /* |
| * 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.felix.dm.context; |
| |
| import java.util.Dictionary; |
| import java.util.Hashtable; |
| |
| /** |
| * An event holds all data that belongs to some external event as it comes in via |
| * the 'changed' callback of a dependency. |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class Event implements Comparable<Event> { |
| protected final static Dictionary<Object, Object> EMPTY_PROPERTIES = new Hashtable<>(); |
| private final Object m_event; // the actual event object (a Service, a Bundle, a Configuration, etc ...) |
| |
| public Event(Object event) { |
| m_event = event; |
| } |
| |
| /** |
| * Returns the actual event object wrapped by this event (a Service Dependency, a Bundle for Bundle Dependency, etc...). |
| */ |
| @SuppressWarnings("unchecked") |
| public <T> T getEvent() { |
| return (T) m_event; |
| } |
| |
| /** |
| * Returns the properties of the actual event object wrapped by this event (Service Dependency properties, ...). |
| */ |
| @SuppressWarnings("unchecked") |
| public <K,V> Dictionary<K,V> getProperties() { |
| return (Dictionary<K,V>) EMPTY_PROPERTIES; |
| } |
| |
| @Override |
| public int hashCode() { |
| return m_event.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| // an instanceof check here is not "strong" enough with subclasses overriding the |
| // equals: we need to be sure that a.equals(b) == b.equals(a) at all times |
| if (obj != null && obj.getClass().equals(Event.class)) { |
| return (((Event) obj).m_event).equals(m_event); |
| } |
| return false; |
| } |
| |
| @Override |
| public int compareTo(Event o) { |
| return 0; |
| } |
| |
| /** |
| * Release the resources this event is holding (like service reference for example). |
| */ |
| public void close() { |
| } |
| } |