/*

* Copyright (c) 2004 - 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:  Call control

*

*/

#ifndef CVTCTLCALLCONTROL_H

#define CVTCTLCALLCONTROL_H

// INCLUDES

#include <e32base.h>

#include "MVtCtlCallControl.h"

#include "MVtCtlCallStatusObserver.h"

#include <etelmm.h>

// FORWARD DECLARATIONS

class MVtCtlEventObserver;

class CVtCtlSessionContainer;

// CLASS DECLARATION

/**

*  Call control implementation.

*

*  @lib CSCallCtrl.lib

*  @since 2.6

*/

NONSHARABLE_CLASS( CVtCtlCallControl ) : 

    public CBase, 

    public MVtCtlCallControl,

    public MVtCtlCallStatusObserver

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aEventObserver reference to event observer

        * @param aCommandObserver reference to command observer

        * @return call control

        */

        static CVtCtlCallControl* NewL(

            MVtCtlEventObserver& aEventObserver );

        /**

        * Destructor.

        */

        virtual ~CVtCtlCallControl();

    public: // From MVtCtlCallControl

        /**

        * @see MVtCtlCallControl::GetDuration

        */

        virtual TInt GetDuration( 

            TVtCtlSessionId aId,

            TVtCtlDuration& aDuration );

        /**

        * @see MVtCtlCallControl::GetSessionInfoL

        */

        virtual void GetSessionInfoL( 

            TVtCtlSessionId aId,

            TDes8& aInfo );

        /**

        * @see MVtCtlCallControl::GetSessionState

        */

        virtual TVtCtlState GetSessionState( 

            TVtCtlSessionId aId ) const;

        /**

        * @see MVtCtlCallControl::GetPreviousPreviousState

        */

        virtual TVtCtlState GetPreviousPreviousState( 

            TVtCtlSessionId aId ) const;

    public: // from MVtCtlCallStatusObserver

        /**

        * @see MVtCtlCallStatusObserver::HandleCallStatusChangeL

        */

        virtual void HandleCallStatusChangeL( 

            TVtCtlSessionId aId,

            MVtCtlCallControl::TVtCtlState aStatus,

            MVtCtlCallControl::TVtCtlState aPreviousStatus );

    private:

        /**

        * C++ constructor.

        */

        CVtCtlCallControl(

            MVtCtlEventObserver& aEventObserver );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

    private:

        /**

        * Validates that data passed as descriptor is of

        * correct type. If not leaves KErrNotSupported.

        * @param aData TVtCtlType derived class represented as descriptor

        * @param aExtension expected type

        */

        static void ValidateDataExtensionL( 

            TDesC8& aData,

            TInt aExtension );

    private:    // Data

        // Event observer

        MVtCtlEventObserver&    iEventObserver;

        // Container for ETel sessions

        CVtCtlSessionContainer* iContainer;

    };

#endif      // CVTCTLCALLCONTROL_H

// End of File