| /******************************************************************************* |
| * Copyright (c) 2007, 2009 Oracle. 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: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.utility.model.event; |
| |
| import java.util.EventObject; |
| import org.eclipse.jpt.utility.internal.StringTools; |
| import org.eclipse.jpt.utility.model.Model; |
| |
| /** |
| * Abstract class for all the change events that can be fired by models. |
| * <p> |
| * Provisional API: This class is part of an interim API that is still |
| * under development and expected to change significantly before reaching |
| * stability. It is available at this early stage to solicit feedback from |
| * pioneering adopters on the understanding that any code that uses this API |
| * will almost certainly be broken (repeatedly) as the API evolves. |
| */ |
| public abstract class ChangeEvent extends EventObject { |
| |
| private static final long serialVersionUID = 1L; |
| |
| |
| /** |
| * Construct a new change event. |
| * |
| * @param source The object on which the event initially occurred. |
| */ |
| protected ChangeEvent(Model source) { |
| super(source); |
| } |
| |
| /** |
| * Covariant override. |
| */ |
| @Override |
| public Model getSource() { |
| return (Model) super.getSource(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| StringTools.buildSimpleToStringOn(this, sb); |
| sb.append('('); |
| int len = sb.length(); |
| this.toString(sb); |
| if (sb.length() == len) { |
| sb.deleteCharAt(len - 1); |
| } else { |
| sb.append(')'); |
| } |
| return sb.toString(); |
| } |
| |
| protected void toString(@SuppressWarnings("unused") StringBuilder sb) { |
| // subclasses should override this to do something a bit more helpful |
| } |
| |
| } |