/*

* Copyright (c) 2007-2008 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 request handler

*

*/

#ifndef CFSMAILREQUESTHANDLER_H

#define CFSMAILREQUESTHANDLER_H

//  INCLUDES

#include "cfsmailplugin.h"

#include "cfsmailplugindata.h"

// FORWARD DECLARATIONS

class CFSMailRequestObserver;

/**

 *  asynchronous request progress indicator

 *

 *  @lib FSFWCommonLib

 *  @since S60 v3.1

 */

class TFSPendingRequest

    {

public:

    /** request status */

    enum TFSRequestStatus

    {

        EFSRequestPending = 1,

        EFSRequestComplete,

        EFSRequestCancelled,

    };

public: // data

    /** request id */

    TInt                       iRequestId;

    /** plugin uid */

    TUid                       iPluginId;

    /** request status */

    TFSRequestStatus           iRequestStatus;

    /** request observer */

    CFSMailRequestObserver*    iObserver;

    };

/**

 *  email framework asynchronous request handler

 *

 *  @lib FSFWCommonLib

 *  @since S60 v3.1

 */ 

class CFSMailRequestHandler : public CBase

	{

public:

    /**

     * destructor.

     */

     IMPORT_C virtual ~CFSMailRequestHandler();

    /**

     * two based constructor

     *

     * @param aPluginInfo plugin information table

     * @param aPlugins plugin instances table

     */

     IMPORT_C static CFSMailRequestHandler* NewL( RPointerArray<CImplementationInformation>&	aPluginInfo,

                                                  RPointerArray<CFSMailPlugin>& aPlugins );

    /**

     * two based constructor

     *

     * @param aPluginInfo plugin information table

     * @param aPlugins plugin instances table

     */

     IMPORT_C static CFSMailRequestHandler* NewLC( RPointerArray<CImplementationInformation>& aPluginInfo,

                                                   RPointerArray<CFSMailPlugin>& aPlugins );

    /**

     * starts asynchronous request

     *

     * @param aPluginId id of the target plugin request is accessed to

     * @param aOperationObserver observer to forward request progress events

     * to user from plugin

     *

     * @return request data

     */

     IMPORT_C TFSPendingRequest InitAsyncRequestL(	TUid aPluginId,

                                                    MFSMailRequestObserver& aOperationObserver);

    /**

     * completes asynchronous request

     *

     * @param aRequestId id of the request to be completed

     */

     IMPORT_C void CompleteRequest( TInt aRequestId );

    /**

     * cancels pending asynchronous request

     *

     * @param aRequestId id of the request to be cancelled

     */

     IMPORT_C void CancelRequestL( TInt aRequestId );

    /**

     * cancels all pending asynchronous requests

     *

     */

     IMPORT_C void CancelAllRequestsL( );

    /**

     * returns plugin pointer related to plugin id

     *

     * @param aPluginId plugin id

     * @return plugin pointer

     */

     IMPORT_C virtual CFSMailPlugin* GetPluginByUid(TFSMailMsgId aPluginId);

    /**

     * adds new plugin to plugin list

     *

     * @param aPluginId uid of the new plugin

     * @param aPlugin plugin instance

     */

     IMPORT_C void AddPluginL( TUid aPluginId, CFSMailPlugin* aPlugin );

     /**

      * cleans temp dir

      * 

      */

     IMPORT_C void CleanTempDirL( );

     /**

      * returns temp dir path

      * 

      */

     IMPORT_C TDesC& GetTempDirL( );

     /**

      * opens or creates file

      * 

      * @param aFileName file name

      */

     RFile GetTempFileL(TFSMailMsgId aContentId,TFileName aFileName);

protected:

    /**

     * C++ default constructor.

     */

  	 IMPORT_C CFSMailRequestHandler();

    /**

     * two based constructor

     */

     void ConstructL( RPointerArray<CImplementationInformation> aPluginInfo,

                      RPointerArray<CFSMailPlugin> aPlugins );

protected: // data

    /** list of loaded plugins */

	 RPointerArray<CFSMailPluginData>    iPluginList;

private: 

    /** removes all asynchronous requests */

    void RemoveAllRequests();

private: // data

    /** list of pending requests */

	 RArray<TFSPendingRequest>           iPendingRequests;

	/** request id counter       */

    TUint                                iRequestId;

    /** temp directory files handling        */ 

    RFs                                  iFs;

    HBufC                                *iTempDirName;

    };

#endif

// End of File