/*

* Copyright (c) 2007-2009 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 FEATURECLIENT_H

#define FEATURECLIENT_H

//  INCLUDES

#include <e32base.h>

#include <featmgr/featurecmn.h>

// CLASS DECLARATION

/**

* Feature manager client interface.

*

*/

class MFeatureClient

    {

    public: // From MFeatureClient

        /**

        * Checks if specified feature is supported and returns 

        * its flags and data if requested.

        * @param aFeature feature entry

        * @return Positive (1) if the feature is supported,

        *         Zero if feature is not supported.

        *         KErrNotFound if feature not found.

        *         Otherwise one of the Symbian error codes. 

        */

        virtual TInt FeatureSupported( TFeatureEntry& aFeature ) const = 0;

        /**

        * Fills feature status array according to status/data in server 

        * 

        * @param aFeatures feature entry array

        * @return KErrNone if no error fetching feature statuses.

        *         Otherwise one of the Symbian OS error codes.

        */

        virtual TInt FeaturesSupported( RFeatureArray& aFeatures ) = 0;

   		/**

        * Enables a certain feature.

        *

        * @param aFeature Feature ID.

        * @return   KErrNone if the feature was succesfully enabled.

        *           KErrAccessDenied if the feature is not modifiable.

        *           KErrPermissionDenied if a capability check fails.

        *           Otherwise one of the Symbian error codes. 

        */

        virtual TInt EnableFeature( TUid aFeature ) const = 0;

       /**

        * Disable a certain feature.

        *

        * @param aFeature Feature ID.

        * @return   KErrNone if the feature was succesfully disabled.

        *           KErrAccessDenied if the feature is not modifiable.

        *           KErrPermissionDenied if a capability check fails.

        *           Otherwise one of the Symbian error codes. 

        */

        virtual TInt DisableFeature( TUid aFeature ) const = 0;

   		/**

        * Enables or disables a certain feature and sets feature data.

        *

        * @param aFeature Feature ID.

        * @param aEnabled Feature enable or disable.

        * @param aData Feature data.

        * @return   KErrNone if the feature was succesfully enabled.

        *           KErrAccessDenied if the feature is not modifiable.

        *           KErrPermissionDenied if a capability check fails.

        *           Otherwise one of the Symbian error codes. 

        */

        virtual TInt SetFeature( TUid aFeature, TBool aEnabled, TInt aData ) const = 0;

   		/**

        * Sets certain feature's data.

        *

        * @param aFeature Feature ID.

        * @param aData Feature data.

        * @return   KErrNone if feature data was succesfully set.

        *           KErrAccessDenied if the feature is not modifiable.

        *           KErrPermissionDenied if a capability check fails.

        *           Otherwise one of the Symbian error codes. 

        */

        virtual TInt SetFeature( TUid aFeature, TInt aData ) const = 0;

   		/**

        * Add a new feature.

        *

        * @param aFeature Feature entry.

        * @return   KErrNone if the feature was succesfully added.

        *           KErrAccessDenied if the feature is not modifiable.

        *           KErrPermissionDenied if a capability check fails.

        *           KErrAlreadyExists if feature already exists.

        *           Otherwise one of the Symbian error codes. 

        */

        virtual TInt AddFeature( TFeatureEntry aEntry ) const = 0;

   		/**

        * Delete a feature.

        *

        * @param aFeature Feature ID.

        * @return   KErrNone if the feature was successfully deleted.

        *           KErrAccessDenied if the feature is not added using AddFeature() method.

        *           KErrPermissionDenied if a capability check fails.

        *           KErrNotFound if the feature not found.

        *           Otherwise one of the Symbian error codes. 

        */

        virtual TInt DeleteFeature( TUid aFeature ) const = 0;

        /**

        * Lists all supported features.

        *

        * @param aSupportedFeatures A reference to a client owned RFeatureUidArray 

        *           array which will be filled with the IDs of supported features. 

        * @return  - One of the Symbian error codes.

        */

        virtual void ListSupportedFeaturesL( RFeatureUidArray& aSupportedFeatures ) = 0;

        /**

        * Requests notification for subset of features changes.

        *

        * @param aFeatures Features, from which client requests notification. 

        * @param aFeatUid Feature id, which will be set by server on completion. 

        * @param aStatus Client request to be signaled. 

        * @return  - One of the Symbian error codes.

        */

        virtual TInt RequestNotification( RFeatureUidArray& aFeatures, TUid& aFeatUid, 

            TRequestStatus& aStatus ) = 0;

        /**

         * Re-requests notification of a feature change.

         * 

         * @param aFeatUid UId of the feature to be re-requested.

         * @param aStatus Client request to be signalled asynchronously.

         * @return One of the Symbian OS system-wide error codes.

         */

        /**

        * Cancel notification request for single feature's changes.

        *

        * @param aFeature Feature, for which client notification cancellation.

        * @return - One of the Symbian error codes.

        */

        virtual TInt RequestNotifyCancel( TUid aFeature ) const = 0;

        /**

        * Cancel notification request for all features changes.

        *

        * @return  - One of the Symbian error codes.

        */

        virtual TInt RequestNotifyCancelAll( ) const = 0;

    };

#endif      // FEATURECLIENT_H

// End of File