remotestoragefw/remotefileengine/inc/rsfwrfestatemachine.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:07:59 +0200
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/*
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* Copyright (c) 2005-2006 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Base class for all operation state machines
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*
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*/
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#ifndef C_RSFW_RFESTATEMACHINE_H
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#define C_RSFW_RFESTATEMACHINE_H
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#include <e32base.h>
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#include "rsfwremoteaccess.h"
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class CRsfwRfeRequest;
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class CRsfwVolumeTable;
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class CRsfwFileEngine;
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class TRfeInArgs;
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class TRfeOutArgs;
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class CRsfwFileEntry;
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class TFid;
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const TInt KUpdateNotRequired = 5;
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/**
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 *  Base class for all operation state machines
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 *
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 */
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class CRsfwRfeStateMachine : public CBase, public MRsfwRemoteAccessResponseHandler
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    {
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public:
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    class TState
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        {
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    public: 
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        virtual void EnterL()=0;// pure virtual
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        virtual TState* CompleteL();
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        virtual TState* ErrorL(TInt aCode);
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        virtual void Cancel();
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        };
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    class TCompleteAndDestroyState : public CRsfwRfeStateMachine::TState 
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        {
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    public:
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        TCompleteAndDestroyState(CRsfwRfeStateMachine* aOperation,
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                                 TInt aErrCode = 0);
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        void EnterL();  
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        void SetErrorCode(TInt aErrorCode);
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    private:
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        CRsfwRfeStateMachine* iOperation;
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        TInt iErrCode;
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        };
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public:
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    void BaseConstructL();
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    ~CRsfwRfeStateMachine();
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    virtual TState* ErrorOnStateEntry(TInt aError);
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    void ChangeState(TState* aNextState);
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    void EnterState(TState* aNextState);
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    void SetNextState(TState* aNextState);
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    void ReEnterCurrentState(); 
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    void SetRequest(CRsfwRfeRequest* aRequest);
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    CRsfwRfeRequest* Request();
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    inline TState* CurrentState(){return iState;};
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    inline TCompleteAndDestroyState* CompleteAndDestroyState()
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        {return iCompleteAndDestroyState;};
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    // completes client's request
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    virtual TState* CompleteRequestL(TInt aError)=0;
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    void SetVolumes(CRsfwVolumeTable* aImplementor);
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    void SetFileEngine(CRsfwFileEngine* aFileEngine);
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    void SetArguments(TRfeInArgs* aInArgs, TRfeOutArgs* aOutArgs);
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    CRsfwVolumeTable* Volumes();
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    CRsfwFileEngine* FileEngine();
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    CRsfwFileEntry* Node();
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    virtual TState* ErrorOnStateExit(TInt aError);
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    // from MRsfwRemoteAccessResponseHandler
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    void HandleRemoteAccessResponse(TUint aId, TInt aStatus); 
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    void DoCancel();
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public:
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    TRfeInArgs* iInArgs;
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    TRfeOutArgs* iOutArgs;
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private:
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    CRsfwFileEntry* iFep;   // target file/directory parameter used by almost all state machines:
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    TCompleteAndDestroyState* iCompleteAndDestroyState; // pre-created so that the request can always be completed (OOM situations etc.)
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    TState*  iState; // our current state  
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    CRsfwRfeRequest *iRFeRequest; // back pointer to the request we are running
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    CRsfwVolumeTable* iImplementor; // class that implements the operations
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    CRsfwFileEngine* iFileEngine; // the file engine    
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    };
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#endif // C_RSFW_RFESTATEMACHINE_H