/*

* 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