/*

* Copyright (c) 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: VideoDeleteWorker class definition*

*/

#ifndef __VIDEODELETEWORKER_H__

#define __VIDEODELETEWORKER_H__

// INCLUDES

#include <QObject>

#include <qvariant.h>

#include <qset.h>

#include <qlist.h>

#include <e32const.h>

#include <mpxitemid.h>

// FORWARD DECLARATIONS

class QTimer;

class VideoListDataModelPrivate;

class VideoCollectionClient;

class VideoDeleteWorker : public QObject

{    

    /**

     * define to be able to use signals and slots

     */

    Q_OBJECT

    /**

     * disable copy-constructor and assignment operator

     */

	Q_DISABLE_COPY(VideoDeleteWorker) 

public: 

	/**

	 * Default constructor

     */

    VideoDeleteWorker(VideoCollectionClient &collection, QObject *parent = 0);	

	/**

     * Destructor

     */

	~VideoDeleteWorker();

	/**

	 * Sets items into mRemoveBuffer. And starts deleting of items in 

	 * blocks using mRequestWaitTimer interval

	 * 

	 * @param itemList items to be deleted

	 */

	void requestDelete(const QList<TMPXItemId> &itemList);

	/**

	 * Removes item from the delete and pending buffer

	 * 

	 * @param itemId item id to removed

	 * 

	 * @returns a coutn of remaining requests

	 */

	int removeFromRequest(TMPXItemId &itemId);

	/**

	 * returns true in case there are items at the delete buffer 

	 * 

	 * @return bool

	 */

	bool isDeleting();

	/**

	 * Updates error status

	 * 

	 * @param status value to update

	 * @param data data to update

	 * 

	 */

	void updateStatus(int status, QVariant data);

	/**

	 * returns latest status and data

	 * 

	 * @param data to return

	 * 

	 * @return status code

	 */

	int getLastStatus(QVariant &data);

	/**

	 * method resets status and statusdatas

	 */

	void clearStatus();

public slots:

	/**

     * Continues deleting in case there are items 

     * yet to be deleted

     */

    void continueSlot();

private:

	/**

	 * methods dumps all remaining deletes to collection

	 * without caring the result codes.

	 */

	void flushAll();

private slots:

    /**

     * creates a block of deleted items and calls collection 

     * to startup deletion

     */

    void execDeleteBlockSlot();

signals:

    /**

     * Emitted if some delete startup fails.

     * 

     * @param list of item ids whose deletion does not start

     */

    void deleteStartupFailed(QList<TMPXItemId>&);

private:

	/**

     * reference to collection client.

     * Not own.

     */

    VideoCollectionClient &mCollectionClient;

	/**

	 * buffer for items to be removed 

	 */

	QSet<TMPXItemId> mRemoveBuffer;

	/**

	 * timer whose interval is used between delete 

	 * requests to collection

	 */

	QTimer *mRequestWaitTimer;

	/**

	 * last error status 

	 */

	int mLastStatus;

	/**

	 * last error data 

	 */

	QVariant mLastStatusData;

};

#endif  // __VIDEODELETEWORKER_H__

// End of file