/*

* 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:  Plugin state main class

*

*/

#ifndef M_AIPLUGINSTATE_H

#define M_AIPLUGINSTATE_H

#include "aipluginstatemachine.h"

/**

 * Plugin state interface.

 * 

 *  @lib aifw

 *  @since S60 3.2

 */

class MAiPluginState

    {

public:

    /**

     * This method is called when state is entered.

     * 

     * @param aStateMachine reference to the owning state machine.

     * @param aStateChange the system state variable change that caused this 

     *        state change.

     */

    virtual void Enter( MAiPluginStateMachine& aStateMachine,

                        TAiStateChanges aStateChange ) = 0;

    /**

     * This method handles system state variable state changes

     * handles events in the current state.

     * 

     * @param aStateMachine reference to the owning state machine.

     * @param aStateChange the system state variable change that is the cause

     *        of this event.

     * @return TBool did the state handle the event.

     */

    virtual TBool HandleEvent( MAiPluginStateMachine& aStateMachine,

                              TAiStateChanges aStateChange ) = 0;

    /**

     * This method is called when state is exited.

     * 

     * @param aStateMachine reference to the owning state machine.

     * @param aStateChange the system state variable change that caused this 

     *        state change.

     */

    virtual void Exit( MAiPluginStateMachine& aStateMachine,

                       TAiStateChanges aStateChange ) = 0;

protected:

    ~MAiPluginState()

        {

        };

    };

#endif // M_AIPLUGINSTATE_H