| /******************************************************************************* |
| * Copyright (c) 2007, 2008 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.ui.internal; |
| |
| import org.eclipse.jpt.utility.Command; |
| import org.eclipse.jpt.utility.CommandExecutor; |
| import org.eclipse.jpt.utility.internal.CommandRunnable; |
| import org.eclipse.swt.widgets.Display; |
| |
| /** |
| * This implementation of CommandExecutor can be used by a non-UI |
| * thread to asynchronously modify a JPA project with any objects associated |
| * with documents that are currently displayed in the UI. |
| */ |
| public final class AsynchronousUiCommandExecutor |
| implements CommandExecutor |
| { |
| public static final CommandExecutor INSTANCE = new AsynchronousUiCommandExecutor(); |
| |
| public static CommandExecutor instance() { |
| return INSTANCE; |
| } |
| |
| // ensure single instance |
| private AsynchronousUiCommandExecutor() { |
| super(); |
| } |
| |
| public void execute(Command command) { |
| this.display().asyncExec(this.buildRunnable(command)); |
| } |
| |
| private Runnable buildRunnable(Command command) { |
| return new CommandRunnable(command); |
| } |
| |
| private Display display() { |
| Display display = Display.getCurrent(); |
| return (display != null) ? display : Display.getDefault(); |
| } |
| |
| } |