/*

* Copyright (c) 2008-2009 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:    Task used for thumbnail availability filter.

*

*/

/**

 * @internal reviewed 30/07/2007 by Simon Brooks

 */

#ifndef C_GLXTNFILTERAVAILABLETASK_H

#define C_GLXTNFILTERAVAILABLETASK_H

#include "glxtntask.h"

// Forward declarations

class CGlxtnFileInfo;

/**

 * Task to filter a list of media item IDs to include only those which don't

 * have a high quality thumbnail of a given size.

 *

 * @author Dan Rhodes

 * @ingroup glx_thumbnail_creator

 */

NONSHARABLE_CLASS(CGlxtnFilterAvailableTask) : public CGlxtnClientTask

    {

public:

    /**

    * Two-phased constructor.

    * @param aItemArray Array of item IDs, from which those with thumbnails

    *                   should be removed.

    * @param aSize Size of thumbnail required.

    * @param aClient Client initiating the request.

    */

	static CGlxtnFilterAvailableTask* NewL(

            	    const TArray<TGlxMediaId>& aItemArray, const TSize& aSize,

            	    MGlxtnThumbnailCreatorClient& aClient);

    /**

    * Destructor.

    */

    ~CGlxtnFilterAvailableTask();

protected:  // From CGlxtnTask

    TBool DoStartL(TRequestStatus& aStatus);

	void DoCancel();

	TBool DoRunL(TRequestStatus& aStatus);

    TBool DoRunError(TInt aError);

private:

    /**

    * C++ default constructor.

    * @param aSize Size of thumbnail required.

    * @param aClient Client initiating the request.

    */

    CGlxtnFilterAvailableTask(const TSize& aSize,

                                MGlxtnThumbnailCreatorClient& aClient);

    /**

    * Symbian 2nd phase constructor.

    * @param aItemArray Array of item IDs, from which those with thumbnails

    *                   should be removed.

    */

	void ConstructL(const TArray<TGlxMediaId>& aItemArray);

    /**

    * Start asynchronous request for file information for an item.

    * @param aStatus Request status for the asynchronous operation.

    */

    TBool GetFileInfoL(TRequestStatus& aStatus);

    /**

    * Start asynchronous check for thumbnail in persistent storage.

    * @param aStatus Request status for the asynchronous operation.

    */

    TBool CheckIdL(TRequestStatus& aStatus);

private:

    enum TFilterState

        {

        EStateFetchingUri, EStateChecking

        };

    /** Size of thumbnail for which to check */

    TSize iSize;

    /** Array of media IDs from which those with thumbnails are removed */

    RArray<TGlxMediaId> iIdArray;

    /** Current task state */

    TFilterState iState;

    /** Current index in Id array */

    TInt iIndex;

    /** File info for current item */

    CGlxtnFileInfo* iFileInfo;

    };

#endif  // C_GLXTNFILTERAVAILABLETASK_H