| /******************************************************************************* |
| * Copyright (c) 2012 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.common.ui.internal.jface; |
| |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jpt.common.utility.internal.StringTools; |
| |
| /** |
| * Empty implementation of {@link ISelection}. |
| * Implemented as a singleton. |
| */ |
| public class EmptySelection |
| implements ISelection |
| { |
| public static final ISelection INSTANCE = new EmptySelection(); |
| |
| public static ISelection instance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure a single instance. |
| */ |
| private EmptySelection() { |
| super(); |
| } |
| |
| public boolean isEmpty() { |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return StringTools.buildSingletonToString(this); |
| } |
| } |