1 /*******************************************************************************

     2  * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

     3  * All rights reserved. This program and the accompanying materials

     4  * are made available under the terms of the Eclipse Public License v1.0

     5  * which accompanies this distribution, and is available at

     6  * http://www.eclipse.org/legal/epl-v10.html

     7  *

     8  * Contributors:

     9  *     Nokia Corporation - initial implementation

    10  *******************************************************************************/

    11 package org.eclipse.swt.internal.qt.graphics;

    12 

    13 import org.eclipse.swt.widgets.Display;

    14 

    15 /** 

    16  * Class for general utilities for common graphics

    17  */

    18 final class Utils {

    19 	

    20 	/**

    21 	 * Validates that ui thread is created and execution is 

    22 	 * currently in ui thread.

    23 	 * 

    24 	 * @throws java.lang.Error if ui thread is not initialized or 

    25 	 * this method is not called within ui thread.

    26 	 */

    27 	static void validateUiThread() {

    28 		if (!Config.ENABLE_UI_THREAD_VALIDATION) {

    29 			return;

    30 		}

    31 		if (Display.getCurrent() == null) {

    32 			throw new Error("Ui thread not initialized or call was made outside ui thread");

    33 		} else {

    34 			Display display = Display.getCurrent();

    35 			if (Thread.currentThread() != display.getThread()) {

    36 				throw new Error("Call to common graphics object occured outside ui thread");

    37 			}

    38 		}

    39 	}

    40 

    41 }