/*

* Copyright (c) 2006-2009 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:  image composer listener for setting pending image objects present

 *

*/

#ifndef IMAGEPRESENTOBSERVER_H_

#define IMAGEPRESENTOBSERVER_H_

#include "mdeharvestersession.h"

// forward declarations

class CMdENamespaceDef;

class CComposerImagePlugin;

/**

 *  CImagePresentObserver

 * 

 */

class CImagePresentObserver : public CActive, public MMdEObjectPresentObserver

	{

public:

	enum TRequest

		{

		ERequestIdle,

		ERequestWaitPendingCount,

		ERequestWaitPending,

		ERequestProcess

		} 

	;

	/**

	 * Destructor.

	 */

	~CImagePresentObserver();

	/**

	 * Two-phased constructor.

	 */

	static CImagePresentObserver* NewL( CMdESession* aSession, CComposerImagePlugin* aComposer, 

			CMdEHarvesterSession* aMdEHarvesterSession );

    /**

     * Set next request (=state) of this active object.

     * @param aRequest  State enumeration.

     */       

    void SetNextRequest( TRequest aRequest );	

    /**

     * Standard RunL-method.

     * From CActive.

     */       

    void RunL();

    /**

     * From CActive.

     */       

    void DoCancel();

    /**

     * From CActive.

     * @param aError  Leave error code.

     * @return Always KErrNone.

     */       

    TInt RunError( TInt aError );

protected:

	/**

	 * Called to notify the observer that objects has been set

	 * to present or not present state in the metadata engine database.

	 *

	 * @param aSession session

	 * @param aPresent state: ETrue - present or  EFales - not present

	 * @param aObjectIdArray object IDs which are set to present state

	 */

	void HandleObjectPresentNotification(CMdESession& aSession, 

			TBool aPresent, const RArray<TItemId>& aObjectIdArray);

private:

	/**

	 * Constructor for performing 1st stage construction

	 */

	CImagePresentObserver();

	/**

	 * EPOC default constructor for performing 2nd stage construction

	 */

	void ConstructL( CMdESession* aSession, CComposerImagePlugin* aComposer, CMdEHarvesterSession* aMdEHarvesterSession );

	void CleanUp();

private:

	/**

	 * Pointer to default Mde namespace.

	 */

	CMdENamespaceDef* iDefaultNamespace;

	/**

	 * Pointer to Mde session.

	 */

	CMdESession* iSession;

	CMdEHarvesterSession* iMdEHarvesterSession;

	/**

	 * Pointer to a composer.

	 */

	CComposerImagePlugin* iComposer;	

	TGetPendingPgckWrapper* iPendingPckWrapper;

	RArray<TItemId> iPresentObjectIds;

	RArray<TItemId> iPendingObjectIds;

	RArray<TItemId> iComposeObjectIds;

    TRequest iNextRequest;

    TInt iPendingCount;

    CMdCSerializationBuffer* iPendingBuffer;

    TBool iStarted;

	};

#endif /*IMAGEPRESENTOBSERVER_H_*/