/*

* Copyright (c) 2005-2006 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:  Publish and subscribe parameter observer implementation.

*

*/

#ifndef MAIPSPROPERTYOBSERVER_H

#define MAIPSPROPERTYOBSERVER_H

// INCLUDES

#include <e32base.h>

// CLASS DECLARATION

/**

*  It is the interface for handling property change events.

*

*  @since S60 3.2

*/

class MAiPSPropertyObserver

    {

    public:

        /**

	 	 * Get the current value of the key.

	 	 * 

	 	 * @since S60 3.2

	 	 * @param aValue refrerence to an integer value of key

	 	 * @return integer value of the error.

	 	 */

        virtual TInt Get( TInt& aValue) = 0;

        /**

	 	 * Get the current value of the key.

	 	 * 

	 	 * @since S60 3.2

	     * @param aString reference to an 8-bit descriptor of the key

	 	 * @return integer value of the error.

	 	 */

        virtual TInt Get( TDes8& aString ) = 0;

        /**

	 	 * Get the current value of the key.

	 	 * 

	 	 * @since S60 3.2

	 	 * @param aString reference to an 16-bit descriptor of the key

	 	 * @return integer value of the error.

	 	 */

        virtual TInt Get( TDes16& aString ) = 0;

        /**

	     * Release the observer

	     */

        virtual void Release() = 0;

    protected:

        ~MAiPSPropertyObserver() { }

    };

/**

 * Helper for calling MAiPSPropertyObserver::Release() with NULL checking.

 */

inline void Release(MAiPSPropertyObserver* obj)

    {

    if (obj)

        {

        obj->Release();

        }

    }

#endif      // MAIPSPROPERTYOBSERVER_H

// End of File