| /******************************************************************************* |
| * Copyright (c) 2006, 2007 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.core.databinding.observable; |
| |
| import java.util.EventObject; |
| |
| /** |
| * Abstract event object for events fired by {@link IObservable} objects. All |
| * events fired by observables must be derived from this class so that the way |
| * of dispatching events can be improved in later versions of the framework. |
| * |
| * @since 1.0 |
| * |
| */ |
| public abstract class ObservableEvent extends EventObject { |
| |
| /** |
| * Creates a new observable event. |
| * |
| * @param source |
| */ |
| public ObservableEvent(IObservable source) { |
| super(source); |
| } |
| |
| /** |
| * |
| */ |
| private static final long serialVersionUID = 7693906965267871813L; |
| |
| /** |
| * Returns the observable that generated this event. |
| * |
| * @return the observable that generated this event |
| */ |
| public IObservable getObservable() { |
| return (IObservable) getSource(); |
| } |
| |
| /** |
| * Dispatch this event to the given listener. Subclasses must implement this |
| * method by calling the appropriate type-safe event handling method on the |
| * given listener according to the type of this event. |
| * |
| * @param listener |
| * the listener that should handle the event |
| */ |
| protected abstract void dispatch(IObservablesListener listener); |
| |
| /** |
| * Returns a unique object used for distinguishing this event type from |
| * others. |
| * |
| * @return a unique object representing the concrete type of this event. |
| */ |
| protected abstract Object getListenerType(); |
| |
| } |