/*

* Copyright (c) 2005 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: 

*     Singleton class for handling states and their transitions.

*

*/

#ifndef CPHONESTATEHANDLE_H

#define CPHONESTATEHANDLE_H

// INCLUDES

#include <pevirtualengine.h>

#include "mphonestatemachine.h"

#include "cphoneresourceresolverbase.h"

#include "mphoneviewcommandhandle.h"

#include "cphoneuistatemachinefactorybase.h"

#include <coemain.h>

// FORWARD DECLARATIONS

class MPhoneState;

class CPhoneErrorMessagesHandler;

// CLASS DECLARATION

/**

*  Singleton class for handling states and their transitions

*/

class CPhoneStateHandle : public CCoeStatic

    {

    public: 

        /**

        * First call initializes the singleton object. Subsequent calls panic. 

        * Singleton must be initialized only once and then Instance() method 

        * must be used to get handle to instance.

        * @return the created instance.

        */

        static CPhoneStateHandle* CreateL( 

            MPhoneViewCommandHandle* aViewCommandHandle,

            const TDesC& aFileName, 

            const TUid aFactoryUid );

        /**

        * Returns an instance of this class.

        * @return A pointer to CPhoneStateHandle class 

        */

        IMPORT_C static CPhoneStateHandle* Instance();

        /**

        * Destructor.

        */

        virtual ~CPhoneStateHandle();

        /**

        * Returns the state machine

        * @return State machine

        */

        /**

        * Returns the view command handle

        * @return view command handle

        */

        IMPORT_C MPhoneViewCommandHandle* ViewCommandHandle();

    private:

        /**

        * Loads handle to GSM or VoIP factory

        * @return pointer to Phone Engine Info

        */

        void LoadLibraryHandleL( 

            const TDesC& aFileName,

            const TUid aFactoryUid );

        /**

        * Default constructor is private because we are using the

        * Singleton design pattern.

        */

        CPhoneStateHandle(

            MPhoneViewCommandHandle* aViewCommandHandle );

        /**

        * By default EPOC constructor is private.

        */

        void ConstructL(

            const TDesC& aFileName, 

            const TUid aFactoryUid );

    private:

        /**

        * View's command handle

        */

        MPhoneViewCommandHandle* iViewCommandHandle;

        /**

        * Pointer to GSM or VoIP specific state machine

        */

        MPhoneStateMachine* iPhoneStateMachine;

        /**

        * Pointer to GSM or VoIP specific resource resolver

        */

        CPhoneResourceResolverBase*   iPhoneResourceResolver;

        /**

        * Pointer to GSM or VoIP specific error messages handler

        */

        CPhoneErrorMessagesHandler* iPhoneErrorMessagesHandler;

        /**

        * Pointer to GSM or VoIP specific factory.

        */

        CPhoneUIStateMachineFactoryBase* iStateMachineFactory;

        TLibraryFunction iEntry;

        RLibrary iFactoryLibrary;

    };

#endif // CPHONESTATEHANDLE_H

// End of File