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/*******************************************************************************
* Copyright (c) 2008, 2009 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;
import org.eclipse.jpt.utility.CommandExecutor;
/**
* This implementation of the CommandExecutor interface allows the client to
* specify a different Command Executor for each thread.
*/
public class ThreadLocalCommandExecutor implements CommandExecutor {
protected final ThreadLocal<CommandExecutor> threadLocal;
protected final CommandExecutor defaultCommandExecutor;
/**
* The default command executor simply executes the command directly.
*/
public ThreadLocalCommandExecutor() {
this(CommandExecutor.Default.instance());
}
public ThreadLocalCommandExecutor(CommandExecutor defaultCommandExecutor) {
super();
this.defaultCommandExecutor = defaultCommandExecutor;
this.threadLocal = this.buildThreadLocal();
}
protected ThreadLocal<CommandExecutor> buildThreadLocal() {
return new ThreadLocal<CommandExecutor>();
}
public void execute(Command command) {
this.getThreadLocalCommandExecutor().execute(command);
}
protected CommandExecutor getThreadLocalCommandExecutor() {
CommandExecutor ce = this.threadLocal.get();
return (ce != null) ? ce : this.defaultCommandExecutor;
}
/**
* Set the current thread's command executor to the specified value.
*/
public void set(CommandExecutor commandExecutor) {
this.threadLocal.set(commandExecutor);
}
/**
* Return the string representation of the current thread's command
* executor.
*/
@Override
public String toString() {
return this.getThreadLocalCommandExecutor().toString();
}
}
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