diff -r 000000000000 -r 14df0fbfcc4e sapi_sensor/inc/sensorcallback.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sapi_sensor/inc/sensorcallback.h	Mon Mar 30 12:51:10 2009 +0300
@@ -0,0 +1,107 @@
+/*
+* Copyright (c) 2006-2007 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:  Callback class declaration for sensor service API
+*
+*/
+
+
+#ifndef CSENSORCALLBACK_H
+#define CSENSORCALLBACK_H
+
+
+#include <Liwserviceifbase.h>
+#include <LiwCommon.h>
+#include <sensrvtypes.h>
+#include <sensrvdatalistener.h>
+#include <sensrvchannelinfo.h>
+#include "sensorinterface.hrh"
+#include "sensorinterface.h"
+
+/**
+ *  This class implements sensor  callback.
+ *  An object of this class gets instantiated by sensor
+ *  interface class when a request for getting sensor data
+ *  arrives from consumer.
+ *  @since S60 v5.0
+ */
+
+class CSensorCallback : public CBase,
+                        public MSensrvDataListener
+    {
+    public:
+
+         static CSensorCallback*  NewL( MLiwNotifyCallback* aCallBack,
+                                        TInt32 aTransactionid );
+         virtual ~CSensorCallback();
+
+         /**
+         * Indicates data is available in the receiving buffer. A client can read the
+         * data through ReadData()-function in a related channel object. Data is valid until
+         * the data received notification will occurs again.
+         *
+         * @since S60 5.0
+         * @param[in] aChannel Reference to the related channel object
+         * @param[in] aCount Data object count in receiving buffer.
+         * @param[in] aDataLost Data object lost count.
+         */
+         void DataReceived( CSensrvChannel& aChannel,
+                            TInt aCount,
+                            TInt aDataLost );
+
+         /**
+         * Data listening failed.
+         * If error was fatal, channel has also been closed and sensor server session terminated.
+         * If error was minor, some data has potentially been lost.
+         *
+         * @param[in] aChannel Reference to the related channel object
+         * @param[in] aError Error code.
+         * @since S60 5.0
+         */
+         void DataError( CSensrvChannel& aChannel,
+                         TSensrvErrorSeverity aError);
+
+         /**
+         * Send Received sensor data back to the consumer
+         * @param[in] aChannel Reference to the related channel object
+         * @since S60 5.0
+         */
+         void DataNotificationL( CSensrvChannel& aChannel );
+
+		 
+		/** 
+        * Returns a pointer to a specified interface - to allow future extension
+        * of this class without breaking binary compatibility
+        *
+        * @since S60 5.0
+        * @param aInterfaceUid Identifier of the interface to be retrieved
+        * @param aInterface A reference to a pointer that retrieves the specified interface.
+        */
+        void GetDataListenerInterfaceL( TUid aInterfaceUid, 
+                                        TAny*& aInterface );
+
+    private:
+         void ConstructL();
+         CSensorCallback( MLiwNotifyCallback* aCallBack,
+                          TInt32 aTransactionid );
+    private:
+         
+         MLiwNotifyCallback* iCallBack;
+         TInt32 iTransactionId;
+
+    };
+
+
+
+
+#endif // CSENSORCALLBACK_H