/*

* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package javax.microedition.m3g;

/**

 * Class that wraps runnable in order to catch and forward

 * exceptions that occured when executing in UI thread.

 * This class is used only for running native methods in UI thread.

 */

abstract class M3gRunnable implements Runnable

{

    private Throwable e = null;

    /**

     * From Runnable interface

     */

    public void run()

    {

        try

        {

            doRun();

        }

        catch (Throwable t)

        {

            e = t;

        }

    }

    /**

     * Checks for possible exceptions and errors and throws them forward.

     * Only unchecked exceptions and errors are thrown as only checked

     * exception that m3gcore may throw comes from loader which is not

     * executed in UI thread

     *

     * @throws RuntimeException

     * @throws Error

     */

    public void checkAndThrow()

    {

        if (e == null)

        {

            return;

        }

        if (e instanceof RuntimeException)

        {

            throw(RuntimeException)e;

        }

        else if (e instanceof Error)

        {

            throw(Error)e;

        }

    }

    /**

     * Method to be implemented for the UI thead execution

     */

    abstract void doRun();

}