/*

* Copyright (c) 2007-2009 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:  ESMR imap calendar entry retriever definition

*

*/

#ifndef CESMRICALVIEWERCMDHANDLER_H

#define CESMRICALVIEWERCMDHANDLER_H

#include <e32base.h>

//<cmail>

#include "mesmricalviewerobserver.h"

#include "mesmricalviewercallback.h"

//</cmail>

class CCalSession;

class CFSMailClient;

class CFSMailMessage;

class MESMRIcalViewerCommand;

/**

 * CESMRIcalViewerCmdHandler is responsible for creating and

 * executing esmricalviewer commands for CFSMailMessages.

 */

NONSHARABLE_CLASS( CESMRIcalViewerCmdHandler ) :

        public CBase,

        public MESMRIcalViewerObserver

    {

public: // Construction and destruction

    /**

     * Creates and initialzes new CESMRIcalViewerCmdHandler object.

     * @param aCallback Reference to ESMRIcalviewer callback.

     * @return Pointer to CESMRIcalViewerCmdHandler object.

     */

    static CESMRIcalViewerCmdHandler* NewL(

            MESMRIcalViewerCallback& aCallback );

    /**

     * C++ destructor

     */

    ~CESMRIcalViewerCmdHandler();

public: // Interface

    /**

     * Executes commands on based on CFSMailMessages based on  operation types

     * @param aOpType commands operation type

     * @param aObserver observer of the asynchronous command result

     * @param aMessage the command is executed on this CFSMailMessage

     */

    void ExecuteCommandL(

            TESMRIcalViewerOperationType aOpType,

            MESMRIcalViewerObserver* aObserver,

            CFSMailMessage& aMessage );

    /**

     * Executes commands on based on CFSMailMessages based on  operation types

     * @param aOpType commands operation type

     * @param aObserver observer of the asynchronous command result

     * @param aMessage the command is executed on this CFSMailMessage

     * @param aParam generic extension parameter type to extend ical commands

     */

    void ExecuteCommandL(

            TESMRIcalViewerOperationType aOpType,

            MESMRIcalViewerObserver* aObserver,

            CFSMailMessage& aMessage,

            TAny* aParam );

    /**

     * Cancel asynchronous operation execution

     */

    void CancelOperation();    

public: // From MESMRIcalViewerObserver

    void OperationCompleted(

                    TIcalViewerOperationResult aResult );

    void OperationError(

                    TIcalViewerOperationResult aResult );

private: // Implementation

    CESMRIcalViewerCmdHandler(

            MESMRIcalViewerCallback& aCallback );

    void ConstructL();

    void ExecuteCommandInternalL( 

            TESMRIcalViewerOperationType aOpType,

            MESMRIcalViewerObserver* aObserver,

            CFSMailMessage& aMessage,

            TAny* aParam );

    /**

     * Operation state of command execution

     */

    enum TState

        {

        EIdle,

        EExecuting

        };

private: // Data

    TState iState;

    /// Own. Calendar database session

    CCalSession* iCalSession;

    /// Own. FS Email mail client object.

    CFSMailClient* iMailClient;

    /// Own: Copy of the message to be handled.

    CFSMailMessage* iMessage;

    /// Own: Command array

    MESMRIcalViewerCommand* iCommand;

    /// Ref: Reference to command observer

    MESMRIcalViewerObserver* iObserver;

    /// Ref: ESMRIcalViewer callback

    MESMRIcalViewerCallback& iCallback;

    /// Own: Result structure

    MESMRIcalViewerObserver::TIcalViewerOperationResult iResult;

    };

#endif

// EOF