| /******************************************************************************* |
| * Copyright (c) 2010 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; |
| |
| /** |
| * Provide a container for holding an object that cannot be changed. |
| * |
| * @see ObjectReference |
| */ |
| public interface ReadOnlyObjectReference<V> |
| { |
| /** |
| * Return the current value. |
| */ |
| V getValue(); |
| |
| /** |
| * Return whether the current value is equal to the specified value. |
| */ |
| boolean valueEquals(Object object); |
| |
| /** |
| * Return whether the current value is not equal to the specified value. |
| */ |
| boolean valueNotEqual(Object object); |
| |
| /** |
| * Return whether the current value is <code>null</code>. |
| */ |
| boolean isNull(); |
| |
| /** |
| * Return whether the current value is not <code>null</code>. |
| */ |
| boolean isNotNull(); |
| } |