--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vtengines/videoteleng/Inc/Commands/MVtEngCommandHandler.h	Mon Nov 23 14:47:47 2009 +0200
@@ -0,0 +1,116 @@
+/*
+* 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:  Command handler interface of the engine.
+*
+*/
+
+
+
+#ifndef MVTENGCOMMANDHANDLER_H
+#define MVTENGCOMMANDHANDLER_H
+
+//  INCLUDES
+#include <e32base.h>
+#include "vtengcommands.h"
+
+// CONSTANTS
+
+// MACROS
+
+// DATA TYPES
+
+// FUNCTION PROTOTYPES
+
+// FORWARD DECLARATIONS
+
+class MVtEngCommandObserver;
+
+// CLASS DECLARATION
+
+/**
+*  Handler for commands from client.
+*
+*  @lib videoteleng
+*  @since 2.6
+*/
+class MVtEngCommandHandler
+    {
+    public:        
+
+        /**
+        * EAttribAsync
+        *  command is asynchronous. 
+        * EAttribEnabled
+        *  Command can be executed at the moment.
+        * EAttribSupported
+        *  Command is supported by the engine.
+        */
+        enum TCommandCaps 
+            { 
+            EAttribAsync      = 0x00000001,
+            EAttribEnabled    = 0x00000002,
+            EAttribSupported  = 0x00000004
+            };
+
+        /**
+        * Excecutes a command. This function leaves KErrNotReady
+        * if engine is in such a state that command cannot be
+        * executed.
+        * 
+        * @param aCommandId command to be executed.
+        * @param aParams command parameters, NULL if command
+        * does not require any.
+        */
+        virtual void ExecuteL( 
+            const TVtEngCommandId aCommandId,
+            TDesC8* aParams ) = 0;
+
+        /**
+        * Cancels a command.
+        * @param aCommandId command to cancel. 
+        * @return KErrNotFound if command is not pending.
+        */
+        virtual TInt CancelCommand( const TVtEngCommandId aCommandId ) = 0;
+
+        /**
+        * Returns capabilities of a command.
+        * @return command caps
+        */
+        virtual TInt GetCommandCaps( 
+            const TVtEngCommandId aCommand ) = 0;
+
+        /**
+        * Returns pending command.
+        * @return pending command
+        */
+        virtual TVtEngCommandId PendingCommand() = 0;
+
+        /**
+        * Sets command observer. First call on this is guaranteed
+        * to succeed.
+        * @param aObserver command observer.
+        */
+        virtual void AddObserverL( MVtEngCommandObserver& aObserver ) = 0;
+
+        /**
+        * Removes a command observer or if non-op if specified observer
+        * is not found.
+        * @param aObserver command observer to be removed.
+        */
+        virtual void RemoveObserver( MVtEngCommandObserver& aObserver ) = 0;
+    };
+
+#endif //MVTENGCOMMANDHANDLER_H
+
+// End of File