| /******************************************************************************* |
| * Copyright (c) 2005 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 |
| *******************************************************************************/ |
| /* |
| * $RCSfile: InvalidObject.java,v $ |
| * $Revision: 1.2 $ $Date: 2005/02/15 22:44:52 $ |
| */ |
| package org.eclipse.jem.internal.beaninfo.common; |
| |
| import java.io.ObjectStreamException; |
| import java.io.Serializable; |
| |
| |
| /** |
| * An indicator object for invalid object type. This is used with feature attribute |
| * values from the BeanInfo classes. We can only handle certain types when we |
| * bring them over from the BeanInfo VM. That is because the classes instantiated |
| * in the BeanInfo class may not be available in the IDE. So any invalid value |
| * will be replaced by this class instance. |
| * <p> |
| * This is a singleton class. |
| * There will be one instance (InvalidObject.INSTANCE) in the system. That way |
| * "==" can be used to test for it. |
| * |
| * @since 1.1.0 |
| */ |
| public class InvalidObject implements Serializable { |
| |
| /** |
| * Singleton instance of InvalidObject. |
| * @since 1.1.0 |
| */ |
| public static final InvalidObject INSTANCE = new InvalidObject(); |
| |
| private static final long serialVersionUID = 1105643804370L; |
| |
| /* |
| * Nobody else should create one of these. |
| */ |
| private InvalidObject() { |
| } |
| |
| private Object readResolve() throws ObjectStreamException { |
| return INSTANCE; |
| } |
| } |