/*

* Copyright (c) 2006-2007 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:  Server side session for thumbnail engine

 *

*/

#ifndef THUMBNAILSERVERSESSION_H

#define THUMBNAILSERVERSESSION_H

#include <e32base.h>

#include <e32capability.h>

#include "thumbnailmanagerconstants.h"

// FORWARD DECLARATIONS

class CThumbnailServer;

/**

 *  Server side session for thumbnail engine.

 *

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CThumbnailServerSession ): public CSession2

    {

public:

    /**

     * Constructor.

     *

     * @since S60 v5.0

     * @return New CThumbnailServerSession session.

     */

    CThumbnailServerSession();

    /**

     * Destructor

     *

     * @since S60 v5.0

     */

    virtual ~CThumbnailServerSession();

public:

    /**

     * Message dispatcher.

     *

     * @since S60 v5.0

     * @param aMessage Message to be passed.

     * @return Error code.

     */

    TInt DispatchMessageL( const RMessage2& aMessage );

public:

    // Functions from base classes

    /**

     * CreateL

     *

     * @since S60 v5.0

     */

    void CreateL();

    /**

     * From CSharableSession (pure virtual).

     * Handles service request messages from clients.

     *

     * @since S60 v5.0

     * @param aMessage message from client.

     */

    void ServiceL( const RMessage2& aMessage );

public:

    // New functions

    /**

     * Returns the server pointer.

     *

     * @since S60 v5.0

     * @return Server pointer.

     */

    CThumbnailServer* Server();

    /**

     * Cancellation method.

     *

     * @since S60 v5.0

     */

    void Cancel();

    /**

     * Converts SQL error to E32 error.

     *

     * @since S60 v5.0

     * @param aReason Request message complete value which may be SQL error

     * @return Request message complete value but not SQL error

     */

    static TInt ConvertSqlErrToE32Err( TInt aReason );

    void ResolveMimeTypeL( RFile64* aFile );

    void ModifyThumbnailSize( TInt aSourceType );

private:

    /**

     * RequestThumbByFileHandleAsyncL

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void RequestThumbByFileHandleAsyncL( const RMessage2& aMessage );

    /**

     * RequestThumbByPathAsyncL

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void RequestThumbByPathAsyncL( const RMessage2& aMessage );

    /**

     * RequestThumbByIdAsyncL

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */    

    void RequestThumbByIdAsyncL( const RMessage2& aMessage );

    /**

     * RequestSetThumbnailByBufferL

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */        

    void RequestSetThumbnailByBufferL( const RMessage2& aMessage );

    /**

     * RequestSetThumbnailByBitmapL

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */        

    void RequestSetThumbnailByBitmapL( const RMessage2& aMessage );    

    /**

     * Fetch thumbnail data from database.

     *

     * @since S60 v5.0

     */

    void FetchThumbnailL();

    /**

     * Create a task to generate a new thumbnail

     *

     * @since S60 v5.0

     * @param aFile File handle

     */

    void CreateGenerateTaskFromFileHandleL( RFile64* aFile);

    /**

     * Create a task to generate a new thumbnail

     *

     * @since S60 v5.0

     * @param aBuffer Source image buffer to be set

     */

    void CreateGenerateTaskFromBufferL( TDesC8* aBuffer );

    /**

     * Process a fetched bitmap by creating scale tasks

     * or by returning the bitmap as such.

     *

     * @since S60 v5.0

     */

    void ProcessBitmapL();

    /**

     * ReleaseBitmap()

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void ReleaseBitmap( const RMessage2& aMessage );

    /**

     * Cancels pending request.

     *

     * @since S60 v5.0

     * @param aMessage Message.

     * @return Error code.

     */

    TInt CancelRequest( const RMessage2& aMessage );

    /**

     * Changes priority of pending request.

     *

     * @since S60 v5.0

     * @param aMessage Message.

     * @return Error code.

     */

    TInt ChangePriority( const RMessage2& aMessage );

    /**

     * Create thumbnails.

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void CreateThumbnailsL( const RMessage2& aMessage );

    /**

     * Delete thumbnails.

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void DeleteThumbnailsL( const RMessage2& aMessage );

    /**

     * Delete thumbnails by Id.

     *

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void DeleteThumbnailsByIdL( const RMessage2& aMessage );    

    /**

     * Get the required size (in characters) for a buffer that contains the

     * list of supported MIME types

     * 

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void GetMimeTypeBufferSizeL( const RMessage2& aMessage );

    /**

     * Get the list of supported MIME types and store them in the buffer

     * allocated by the client.

     * 

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void GetMimeTypeListL( const RMessage2& aMessage );

    /**

     * Update thumbnails by Thumbnail ID.

     * 

     * @since S60 v5.0

     * @param aMessage Message.

     */

    void UpdateThumbnailsL( const RMessage2& aMessage );

private:

    // data

    /**

     * Temporary store for any bitmaps fetched from the store.

     * Own.

     */

    CFbsBitmap* iBitmap;

    /**

     * Temporary store for thumbnail request parameters as received

     * from the client.

     */

    TThumbnailRequestParamsPckgBuf iRequestParams;

    /**

     * Message from client. This is kept in a member variable to make

     * sure the message is completed if a leave occurs while handling

     * the request.

     */

    RMessage2 iMessage;

    /**

     * Size of the original object. Only valid if a stored thumbnail

     * was found when processing a request.

     */

    TSize iOriginalSize;

    /**

     * Temporary store for any jpegs fetched from the store.

     * Own.

     */

    TDesC8* iBuffer;

    TInt iBitmapHandle;

};

#endif // THUMBNAILSERVERSESSION_H