/*

* Copyright (c) 2002-2009 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:  Notifier engine*

*/

#ifndef __MDSNOTIFIER_H__

#define __MDSNOTIFIER_H__

#include <e32base.h>

#include "mdscommoninternal.h"

// forward declarations

class CMdSServerSession;

class CMdSNotifyComparator;

class CMdSSchema;

class CMdCSerializationBuffer;

/**

* A class that contains notification profiles for clients.

* The class compares events against each profile and

* triggers the client side which then calls back the observer.

*/

class CMdSNotifier : public CBase

    {

    public: // public construction

        /** static construction */

        static CMdSNotifier* NewL();

        static CMdSNotifier* NewLC();

        /** destructor */

        virtual ~CMdSNotifier();

    private: // private construction

        /** constructor */        

        CMdSNotifier();

        /** 2nd phase constructor */

        void ConstructL();

    public: // methods

        /**

        * An inner class for an entry in the array of listeners to

        * notify for different notification profiles.Each entry

        * contains the notification profiles against which to

        * compare the event and the parameters required to perform

        * the asynchronous notification.

        */

        class TEntry

            {

            friend class CMdSNotifier; // accessible by host

            public:

                /**

                * sets the entry up for asynchronous callback

                * @param aMessage the asynchronous message

                * @param aRemoteSize the pointer to remote message size buffer

                */

                void SetupForCallback( RMessage2 aMessage, TInt aRemoteSizeMsgSlot );

                /**

                * Whether or not this entry has an asynchronous message

                * pending

                */

                TBool IsPending() { return ( iRemoteSizeMsgSlot!=KErrNotFound ); }

                /** the criteria folder */

                CMdCSerializationBuffer& Condition() 

                	{ 

                	return *iSerializedCondition; 

                	}

				/**

				*	Does this entry allow confidential data

				*	@return EFalse if not allowed

				*/

				TBool AllowConfidential()

					{

					return iConfidential;

					}

				/**

				*	Return the id of this entry

				*	@return The id

				*/

				TInt Id()

					{

					return iId;

					}

				/**

				*	Return the id of this entry

				*	@return The id

				*/

				TDefId NamespaceDefId()

					{

					return iNamespaceDefId;

					}

				/**

				*	Trigger a previously cached notification

				*	@param aCompleteCode The code to complete the message

				*	@param aData The data hierarchy to send to the client,

				*                ownership changes only if method doesn't leave

				*	@return none

				*/			

				void TriggerCachedL(TUint32 aCompleteCode, CMdCSerializationBuffer* aData);

				/**

				*	Get the data buffer

				*	@return the serialised data buffer

				*/

				CMdCSerializationBuffer* GetDataBuffer();

            private: // methods for host class

                /** constructor */

                TEntry( TInt aId, TConditionType aType,

                    CMdCSerializationBuffer* aSerializedBuffer,

                    TDefId aNamespaceDefId, 

                    CMdSServerSession& aSession, TBool aConfidential );

                /**

                * Triggers the notifier causing the observer to be

                * notifier with the given code.

                * @param aCompleteCode either added/removed/modified

                * @param aItem the target of the event

                */

                void TriggerL( TUint32 aCompleteCode,

                    const RArray<TItemId>& aIdArray );

                /**

                 * Triggers the notifier causing the observer to be

                 * notifier with the given code.

                 * 

                 * @param aCompleteCode either added/removed/modified

                 * @param aBuffer relation items of the event

                 * @param aRelationIdArray matched relation ids

                 */

                void TriggerRelationItemsL( TUint32 aCompleteCode,

                		CMdCSerializationBuffer& aBuffer,

                		const RArray<TItemId>& aRelationIdArray );

				/**

				 * Trigger a notification of a schema change

				 */

				void TriggerSchema();

				/**

				 *	The entry has currently no message active, 

				 *	wait until one is available.

				 */

                void CacheL(TUint32 aCompleteCode, const RArray<TItemId>& aIdArray );

                /**

				 *	The entry has currently no message active, 

				 *	wait until one is available.

				 */

                void CacheRelationItemsL(TUint32 aCompleteCode,

                		CMdCSerializationBuffer& aBuffer,

                		const RArray<TItemId>& aRelationIdArray);

                /**

				 *	cache schema notification

				 */

                void CacheL(TUint32 aCompleteCode);

                /**

                 * Triggers the notifier with an error code

                 * @param aErrorCode one of system-wide error codes

                 */

                void TriggerError( TInt aErrorCode );

				/**

				 * Copy all IDs from the array in to the buffer

				 * 

				 * @param aIdArray ID array

				 * @return new buffer

				 */

				CMdCSerializationBuffer* CopyToBufferL(

						const RArray<TItemId>& aIdArray);

				/**

				 * Copy matched relation IDs to a buffer

				 * 

				 * @param aRelationItemsBuffer serialized items

				 * @param aIdArray matched IDs

				 * @return new buffer

				 */

				CMdCSerializationBuffer* CopyItemsToBufferL(

						CMdCSerializationBuffer& aRelationItemsBuffer, 

						const RArray<TItemId>& aIdArray);

            private:

                /** id */

                TInt iId;

                /** type of the notification */

                TUint32 iType;

				/** namespace definition ID */

                TDefId iNamespaceDefId;

                /** actual serialized condition */

                CMdCSerializationBuffer* iSerializedCondition;

				/**

				* serialised id or relation items buffer.

				* Used instead of iDataObject when 

				* sending object ids to the clients

				*/

                CMdCSerializationBuffer* iDataBuffer;

                /** asynchronous message */

                RMessage2 iMessage;

                /** pointer to remote size buffer */

                TInt iRemoteSizeMsgSlot;

                /** the session */

                CMdSServerSession& iSession;

                TBool iConfidential;

            };

       /**

        * creates a notifier entry

        * @param aId id of the entry to be created

        * @param aType type of the notifier (object/relation/event)

        * @param aCriteria the serialized criteria to compare against

        * @param aSession the session that owns the notificant

        * @param aConfidential Does the session get notifications of confidential items 

        * @return reference to the created entry

        */

        TEntry& CreateEntryL( TInt aId, TConditionType aType,

            CMdCSerializationBuffer* aSerializedBuffer, TDefId aNamespaceDefId,

            CMdSServerSession& aSession, TBool aConfidential);

       /**

        * finds an entry by its id, if not found leaves with KErrNotFound

        * @param aId id of the entry

        * @return reference to the entry found

        */

        TEntry& FindEntryL( TInt aId );

       /**

        * removes a notifier entry, if not found leaves with KErrNotFound

        * @param aId id of the entry to be removed

        */

        void RemoveEntryL( TInt aId );

       /**

        * removes all notifier entries that belong to a certain session

        * @param aSession session who's notify entries are to be removed

        */

        void RemoveEntriesBySession(const CMdSServerSession& aSession );

       /**

        * notifiers that items has been added

        * @param aSerializedItems serialized items

        * @param aSerializedItemIds serialized item IDs

        */

        void NotifyAddedL(CMdCSerializationBuffer& aSerializedItems, 

        				  CMdCSerializationBuffer& aSerializedItemIds);

       /**

        * notifiers that items has been modified

        * @param aSerializedItems serialized items

        * @param aSerializedItemIds serialized item IDs

        */

        void NotifyModifiedL(CMdCSerializationBuffer& aSerializedItems, 

							 CMdCSerializationBuffer& aSerializedItemIds);

       /**

        * notifiers that items has been modified

        * @param aObjectIds object IDs

        */

        void NotifyModifiedL(const RArray<TItemId>& aObjectIds);

	   /**

        * notifiers that objects has been set to present or not present state

        * @param aPresent are object present state changed to present or not present

        * @param aObjectIds object IDs

		*/

		void NotifyObjectPresent(TBool aPresent, const RArray<TItemId>& aObjectIds);

	   /**

        * notifiers that objects has been set to present or not present state

        * @param aPresent are object present state changed to present or not present

        * @param aObjectIds object IDs

		*/

		void NotifyRelationPresent(TBool aPresent, const RArray<TItemId>& aObjectIds);

	   /**

		* notify about removed relation items

		* 

		* @param aRemovedRelations removed relations

		* @param aAdditionalRemovedRelations possible additional removed relations

		*/

		void NotifyRemovedRelationItemsL( CMdCSerializationBuffer& aBuffer );

		/**

		 * Notifiers that items has been removed. 

		 * Can be only used for default namespace.

		 * 

		 * @param aItemIdArray modified item IDs

		 */

		void NotifyRemovedL(const RArray<TItemId>& aItemIdArray);

		/**

        * notifiers that items has been removed

        * @param aSerializedItemIds serialized item IDs

        * @param aItemIsConfidential are items confidential

        */

        void NotifyRemovedL(CMdCSerializationBuffer& aSerializedItemIds, TBool aItemIsConfidential );

		void NotifySchemaAddedL();

		TBool CheckForNotifier( TUint32 aNotifyTypes );

	private: // data members

        /** the entry array */

        RArray<TEntry> iEntries;

        /** the comparator */

        CMdSNotifyComparator* iComparator;

        TInt iDataAccessCount;

    };

#endif	// __MDSNOTIFIER_H__