/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:  Observer to Delete contacts from the contact store

*

*/

#ifndef C_DELETECONTACTOBSERVER_H

#define C_DELETECONTACTOBSERVER_H

#include <s32file.h> // Used for RFileReadStream and RFileWriteStream

#include <mvpbkcontactobserver.h>    //base class for vCardExEng

#include <mvpbkbatchoperationobserver.h>

#include <mvpbkcontactstoreobserver.h>

#include <cvpbkcontactlinkarray.h>

#include "contactservice.h"

#include "cancelasyncrquest.h"

class CVPbkContactManager;

class MVPbkStoreContact;

class MVPbkContactLink;

class MContactCallback;

class MVPbkContactLinkArray;

class MCancelAsync;

class CDeleteContactObserver : public CBase,

						   	   public MVPbkBatchOperationObserver,

						   	   public MVPbkContactStoreObserver,

						   	   public MCancelAsync

	{

	public:

		/*

		 * called for creating an instace of delete contact observer

		 */

    	static CDeleteContactObserver* NewL(CContactService* aContactService,

											MVPbkContactStore* aContactStore, 

											RPointerArray<TDesC8>& aContactIdArray,

											TInt aTransId,

											MContactCallback* aCallback);

		/*

		 * Destructor

		 */ 

    	~CDeleteContactObserver();

    	/*

    	 * Implementation of Cancel of MCancelAsync

    	 */

		void Cancel();

	private:

		/*

		 * Constructor

		 */

	    CDeleteContactObserver();

	   	/* 

	   	 * Symbian second-phase construction

	   	 */

	    void ConstructL(CContactService* aContactService, 

				  		MVPbkContactStore* aContactStore, 

				  		RPointerArray<TDesC8>& aContactIdArray,

				  		TInt aTransId,

				  		MContactCallback* aCallback);

	    /*

	     * Called for deleting contacts from the contacts database.

	     */

	    void DoDeleteL();

	    /*

		 * Convert the contact ids into link array format.

		 */

	    void ConvertContactIdsToLinkArrayL( RPointerArray<TDesC8>& aContactIdArray );

	private: //MVPbkBatchOperationObserver

		/**

         * Called when one step of the operation is complete.

         * @param aOperation Operation whose step has completed.

         * @param aStepSize Size of the performed step

         */

        void StepComplete( MVPbkContactOperationBase& aOperation,

      			          			TInt aStepSize );

		/**

         * Called when one step of the operation fails.

         * @param aOperation Operation whose step has completed.

         * @param aStepSize Size of the performed step

         * @param aError Error that occured.

         * @return ETrue if the batch operation should continue, 

         *               EFalse otherwise.

         */

        TBool StepFailed( MVPbkContactOperationBase& aOperation,

            		    		  TInt aStepSize, TInt aError );

		/**

         * Called when operation is completed.

         *

         * @param aOperation    the completed operation.

         */

        void OperationComplete( MVPbkContactOperationBase& aOperation );

	private: //MVPbkContactStoreObserver

		/**

	     * Called when a contact store is ready to use.

	     */

		 void StoreReady( MVPbkContactStore& aContactStore );

		 /**

	      * Called when a contact store becomes unavailable.

	      * Client may inspect the reason of the unavailability and decide whether or not

	      * it will keep the store opened (ie. listen to the store events).

	      * @param aContactStore The store that became unavailable.

	      * @param aReason The reason why the store is unavailable.

	      *                This is one of the system wide error codes.

	      */ 

		 void StoreUnavailable( MVPbkContactStore& aContactStore, TInt aReason );

		/**

	     * Called when changes occur in the contact store.

	     * @see TVPbkContactStoreEvent

	     * @param aContactStore The store the event occurred in.

	     * @param aStoreEvent   Event that has occured.

	     */

     	 virtual void HandleStoreEventL(MVPbkContactStore& aContactStore, 

     								    TVPbkContactStoreEvent aStoreEvent );

	private:  //Data members

		/*

		 * Pointer to a contact service

		 */

		CContactService* iContactService;

		/*

		 * Pointer to a contact store

		 */

		MVPbkContactStore* iContactStore;

		/*

		 * Pointer to a contact link array.

		 */

		CVPbkContactLinkArray* iContactLinkArray;

		/*

		 * Pointer to a callback.

		 */

		MContactCallback* iCallback;

		/*

	     * Transaction Id.

	     */

	    TInt iTransId;

	    RPointerArray<MVPbkContactLinkArray> iLinkArrayToDelete;

	   /*

        * OperationBase pointer to be used to cancel async request

	    */

	    MVPbkContactOperationBase* iOp;

	};

#endif //C_DELETECONTACTOBSERVER_H