/*

* Copyright (c) 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:  Base class for state.

*

*/

#ifndef SVPHOLDSTATEBASE_H

#define SVPHOLDSTATEBASE_H

#include <e32base.h>

class CSVPHoldContext;

/**

*  Base class for state.

*  

*  @lib svp.dll

*  @since Series 60 3.2

*/

class CSVPHoldStateBase : public CBase

    {

public:  // Constructors and destructor

    /**

    * Destructor.

    */

    virtual ~CSVPHoldStateBase();

public: // New functions

    /**

    * Applies the current state. Called after the state transition.

    * Leaves on error.

    * @since Series 60 3.2

    * @param aContext The Context of hold

    */

    void ApplyL( CSVPHoldContext& aContext );

    /**

    * Called when the state is entered, before it is applied.

    * @since Series 60 3.2

    * @param aSession The MCE session

    */

    void Enter( CSVPHoldContext& aSession );

    /**

    * Checks if OutEstablishingState is active.

    * @since Series 60 3.2

    * @return ETrue if establishing state active, EFalse otherways

    */

    virtual TBool IsOutEstablishingStateActive();

protected:  // New functions

    /**

    * Applies the current concrete state. Leaves on error.

    * @since Series 60 3.2

    * @param aContext SVP Hold context

    * @return None

    */

    virtual void DoApplyL( CSVPHoldContext& aContex ) = 0;

    /**

    * Called when the state is entered. Implemented by

    * concrete states.

    * @since Series 60 3.2

    * @param aContext SVP Hold context

    * @return None

    */

    virtual void DoEnter( CSVPHoldContext& aContex ) = 0;

    /**

    * C++ default constructor.

    */

    CSVPHoldStateBase();

    };

#endif      // SVPHOLDSTATEBASE_H