/*

 * Copyright (c) 2005-2007 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:  Observer interfaces for asynchronous operations

 *

 */

 #ifndef VPBKOPERATIONOBSERVER_H

 #define VPBKOPERATIONOBSERVER_H

 // INCLUDES

 #include <e32base.h>

 class MVPbkContactOperationBase;

 // CLASS DECLARATION

 /**

  * An observer for asynchronous operations that do not return anything.

  */

 class MVPbkOperationObserver

     {

     public:

     	/**

     	 * The operation was completed succesfully.

     	 * 

     	 * @param aOperation operation handle

     	 */

         virtual void VPbkOperationCompleted(

                 MVPbkContactOperationBase* aOperation ) = 0;

     protected:

         /* Destroying via this interface is not allowed */

         ~MVPbkOperationObserver(){}

     };

 /**

  * An observer for asynchronous operations

  * that return result of ResultType type.

  */

 template<typename ResultType>

 class MVPbkOperationResultObserver

     {

     public:

         /**

          * The operation was completed succesfully.

          * 

          * @param aOperation operation handle

          * @param aOperationResult operation result

          */

         virtual void VPbkOperationResultCompleted(

                 MVPbkContactOperationBase* aOperation,

                 ResultType aOperationResult ) = 0;

     protected:

         /* Destroying via this interface is not allowed */

         ~MVPbkOperationResultObserver(){}

     };

 /**

  * An observer for asynchronous operations 

  * to receive error notifications when an operation fails.

  */

 class MVPbkOperationErrorObserver

     {

     public:

         /**

          * An error occured in the operation that was requested.

          * 

          * @param aOperation operation handle 

          * @param aError Operation error code.

          */

         virtual void VPbkOperationFailed(

                 MVPbkContactOperationBase* aOperation,

                 TInt aError ) = 0;

     protected:

         /* Destroying via this interface is not allowed */

         ~MVPbkOperationErrorObserver(){}

     };

 #endif //VPBKOPERATIONOBSERVER_H

 //End of file