RunnableLock.java

/*******************************************************************************
 * Copyright (c) 2000, 2003, 2012 IBM Corporation, Gerhardt Informatics Kft. and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Gerhardt Informatics Kft. - GEFGWT port
 *******************************************************************************/
package org.eclipse.swt.widgets;

/**
 * Instances of this class are used to ensure that an application cannot
 * interfere with the locking mechanism used to implement asynchonous and
 * synchronous communication between widgets and background threads.
 */

class RunnableLock {
	Runnable runnable;
	Throwable throwable;

	RunnableLock(Runnable runnable) {
		this.runnable = runnable;
	}

	boolean done() {
		return runnable == null || throwable != null;
	}

	void run() {
		if (runnable != null) {
			runnable.run();
		}
		runnable = null;
	}
}