--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vtengines/videoteleng/Inc/Commands/CVtEngOperation.h	Mon Nov 23 14:47:47 2009 +0200
@@ -0,0 +1,158 @@
+/*
+* Copyright (c) 2006 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:  Operation base class.
+*
+*/
+
+
+
+#ifndef CVTENGOPERATION_H
+#define CVTENGOPERATION_H
+
+//  INCLUDES
+#include <e32base.h>
+#include "vtengcommands.h"
+
+// FORWARD DECLARATIONS
+class CVtEngCommandHandler;
+class CVtEngHandlerContainer;
+class MVtEngOperationObserver;
+
+/**
+*  Operation base class.
+*
+*  @lib videoteleng
+*  @since 2.6
+*/
+NONSHARABLE_CLASS( CVtEngOperation ) : public CBase
+    {
+    public: // constructor and destructors
+
+        /**
+        * two-phase constructor
+        * @param aCommandId command id
+        * @param aHandlers handler container
+        * @param aObserver observer called back when operation is completed
+        * @param aDelete if ETrue command deletes itself after completion
+        */
+        static CVtEngOperation* NewL(
+            TVtEngCommandId aCommandId,
+            CVtEngHandlerContainer& aHandlers,
+            MVtEngOperationObserver& aObserver,
+            TBool aDelete = ETrue );
+
+        /**
+        * Destructor
+        */
+        ~CVtEngOperation( );
+
+    public: // new functions
+
+        /**
+        * Performs operations.
+        * @return ETrue is operation is complete (i.e. sync).
+        */
+        virtual TBool ExecuteL( TDesC8* aParams );
+
+        /**
+        * Cancels pending command.
+        * @return ETrue if cancelled was succesfull or there
+        * is nothing to cancel.
+        */
+        TBool Cancel();
+
+        /**
+        * Returns command identifier.
+        * @return command identifier
+        */
+        inline TVtEngCommandId Command() const;
+
+        /**
+        * Returns command parameter buffer.
+        * @return parameter buffer
+        */
+        inline const TDesC8* Parameters() const;
+
+        /**
+        * Notifies observer on completion.
+        * @param aResult Symbian OS error code
+        */
+        virtual void HandleOpComplete( const TInt aResult );
+
+    protected: // new functions
+
+        /**
+        *
+        */
+        TBool OfferExecuteSyncL( TDesC8* aParams );
+
+    protected:
+        /**
+        * c++ constructor
+        */
+        CVtEngOperation(
+            TVtEngCommandId aCommandId,
+            CVtEngHandlerContainer& aHandlers,
+            MVtEngOperationObserver& aCommandHandler,
+            TBool aDelete );
+	
+		/**
+        * Handles asynchronous operation complete
+        */
+    	static TInt ASyncHandleOpComplete( TAny* aPtr );
+
+    protected:
+
+        // Command identifier
+        const TVtEngCommandId   iCommand;
+
+        // Handler container
+        CVtEngHandlerContainer& iHandlers;
+
+        // observer for command response
+        MVtEngOperationObserver&   iObserver;
+
+        // Parameter
+        TDesC8*                 iParams;
+
+        // Delete command when complete
+        TBool                   iDelete;
+		
+		// Pointer to asynchronous callback
+        CAsyncCallBack*         iAsyncCallback;
+
+		// Asynchronous callback error identifier
+        TInt                    iAsyncErr;
+    };
+
+/**
+* Utility class for unpacking data type with descriptor data.
+* @lib videoteleng
+* @since 2.6
+*/
+template <class T>
+class TVtEngOpParamUtil
+    {
+    public:
+        /**
+        * Sets parameter in aDes to aRef.
+        */
+        inline void static Set( T& aRef , const CVtEngOperation& aOp );
+    };
+
+#include    "CVtEngOperation.inl"
+
+#endif      // CVTENGOPERATION_H
+
+// End of File