| /******************************************************************************* |
| * Copyright (c) 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.utility.internal; |
| |
| import org.eclipse.jpt.utility.Command; |
| |
| /** |
| * This implementation of the Command interface allows the client to |
| * specify a different Command for each thread. |
| */ |
| public class ThreadLocalCommand implements Command { |
| protected final ThreadLocal<Command> threadLocal; |
| protected final Command defaultCommand; |
| |
| /** |
| * The default command does nothing. |
| */ |
| public ThreadLocalCommand() { |
| this(Command.Null.instance()); |
| } |
| |
| public ThreadLocalCommand(Command defaultCommand) { |
| super(); |
| this.defaultCommand = defaultCommand; |
| this.threadLocal = this.buildThreadLocal(); |
| } |
| |
| protected ThreadLocal<Command> buildThreadLocal() { |
| return new ThreadLocal<Command>(); |
| } |
| |
| public void execute() { |
| this.get().execute(); |
| } |
| |
| protected Command get() { |
| Command command = this.threadLocal.get(); |
| return (command != null) ? command : this.defaultCommand; |
| } |
| |
| /** |
| * Set the current thread's command to the specified value. |
| */ |
| public void set(Command command) { |
| this.threadLocal.set(command); |
| } |
| |
| /** |
| * Return the string representation of the current thread's command. |
| */ |
| @Override |
| public String toString() { |
| return this.get().toString(); |
| } |
| |
| } |