| /******************************************************************************* |
| * Copyright (c) 2008, 2013 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License 2.0, which accompanies this distribution |
| * and is available at https://www.eclipse.org/legal/epl-2.0/. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.internal.command; |
| |
| import org.eclipse.jpt.common.utility.command.Command; |
| |
| /** |
| * This command allows the client to specify a different command for each |
| * thread. If there is no command for the current thread, the configured default |
| * command is executed. |
| * @see #set(Command) |
| */ |
| public class ThreadLocalCommand |
| implements Command |
| { |
| private final ThreadLocal<Command> threadLocal; |
| private final Command defaultCommand; |
| |
| public ThreadLocalCommand(Command defaultCommand) { |
| super(); |
| if (defaultCommand == null) { |
| throw new NullPointerException(); |
| } |
| this.defaultCommand = defaultCommand; |
| this.threadLocal = this.buildThreadLocal(); |
| } |
| |
| private ThreadLocal<Command> buildThreadLocal() { |
| return new ThreadLocal<Command>(); |
| } |
| |
| public void execute() { |
| this.get().execute(); |
| } |
| |
| private 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(); |
| } |
| } |