/*

* Copyright (c) 2009 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:

*

*/

#ifndef C_RADIOREPOSITORYENTITY_H

#define C_RADIOREPOSITORYENTITY_H

#include <centralrepository.h>

#include "cradiorepositoryentitybase.h"

#include "mradiorepositoryentityobserver.h"

/**

 * Templated class to listen to a single key within the central repository.

 *

 * Notifies the observer of changes in the key, and provides caching for the key's value.

 */

template <typename T>

NONSHARABLE_CLASS( CRadioRepositoryEntity ) : public CRadioRepositoryEntityBase

    {

public:

    static CRadioRepositoryEntity<T>* NewL( const TUid& aUid, 

                                            TUint32 aKey, 

                                            MRadioRepositoryEntityObserver& aObserver, 

                                            CActive::TPriority aPriority = CActive::EPriorityStandard );

    ~CRadioRepositoryEntity();

    /**

     * Sets the value of the entity.

     * The value is written into the central repository immediately.

     *

     * @param   aValue  The value to set.

     * @param   aSavingEnabled If ETrue, saving to central repository file is enabled

     */

    TInt SetValue( const T& aValue, TBool aSavingEnabled );

    /**

     * Returns a cached reference to the value of the entity.

     *

     * @return  The cached value of the entity.

     */

    const T& Value() const;

    /**

     * Forcibly updates the key's value from the central repository and caches it.

     */

    void UpdateL();

// from base class CActive

    void RunL();

    void DoCancel();

private:

    CRadioRepositoryEntity( const TUid& aUid, 

                            TUint32 aKey, 

                            MRadioRepositoryEntityObserver& aObserver, 

                            CActive::TPriority aPriority );

    void ConstructL();

protected:

    /** The central repository client. */

    CRepository*    iRepository;

    /** The cached value of the key. */

    T               iValue;

    };

#include "cradiorepositoryentity.inl"

#endif // C_RADIOREPOSITORYENTITY_H