--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/videofeeds/livetvutils/inc/CIptvEpgFileSwapper.h	Mon Jan 18 20:21:12 2010 +0200
@@ -0,0 +1,152 @@
+/*
+* Copyright (c) 2009 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: 
+*
+*/
+
+
+#ifndef __CIPTVEPGFILESWAPPER_H
+#define __CIPTVEPGFILESWAPPER_H
+
+// System includes
+#include <e32base.h>		// For CActive
+#include <f32file.h>		// For RFs
+//#include <babackup.h>		// F
+
+// Forward declarations
+class CBaBackupSessionWrapper;
+class MIptvEpgFileSwapObserver;
+
+/**
+*	Class to replace given old file with given new file.
+*	This class takes care of requesting to close affected files by
+*	using CBaBackupSessionWrapper and monitors the state of those two files.
+*	When both files are not open by any other instance anymore this class
+*	performs the file switching in it's RunL method and after that signalizes
+*	the observers via CBaBackupSessionWrapper that they are allowed to re-open
+*	the files for reading and writing.
+*/
+class CIptvEpgFileSwapper : public CActive
+	{
+	public:
+		/**
+		*	Symbian two phace constructor.
+		*	@param	aOldFileName	Name of the file to be replaced
+		*	@param	aNewFileName	Name of the file to be used to replace aOldFileName
+		*	@return	Pointer to newly created instance of CIptvEpgFileSwapper object
+		*/
+		IMPORT_C static CIptvEpgFileSwapper* NewL( const TFileName& aOldFileName,
+												   const TFileName& aNewFileName,
+											       MIptvEpgFileSwapObserver& aSwapObserver );
+		
+		/**
+		*	Destructor
+		*/
+		virtual ~CIptvEpgFileSwapper();
+		
+	public:
+		/**
+		*	Method to initiate file swapping process. This method signalizes the
+		*	backupwrapper to ask all the backup observers for aOldFileName and aNewFilename
+		*	to release their handles to the files and sets this object to active state.
+		*	@param	None
+		*	@return	None
+		*/
+		IMPORT_C void SwapFilesL();
+	
+	private:
+		/**
+		*	Default constructor
+		*	@param	aOldFileName	Name of the file to be replaced
+		*	@param	aNewFileName	Name of the file to be used to replace aOldFileName
+		*	@param	aSwapObserver	Reference to a class that observes the file swapping
+		*	@return	None
+		*/
+		CIptvEpgFileSwapper( const TFileName& aOldFileName,
+							 const TFileName& aNewFileName,
+							 MIptvEpgFileSwapObserver& aSwapObserver );
+		
+		/**
+		*	Symbian second phase constructor containing the code that might leave
+		*	during instantiation of this class.
+		*	@param	None
+		*	@return	None
+		*/
+		void ConstructL();
+		
+		/**
+		*	Method that calls RestartFile method of CBaBackupSessionWrapper to allow
+		*	observers to re-establish the connections to the files.
+		*	@param	None
+		*	@return	None
+		*/
+		void ReleaseFileLocks();
+		
+	private: // From CActive
+		/**
+		*	Overwritten error handling method to get called when active scheduler catches
+		*	leave in this active object.
+		*	@param	aError	Symbian error code for the occured error
+		*	@return	KErrNone if error was handled by this method. If return value is
+		*					something else but KErrNone, active scheduler will panic.
+		*/
+		TInt RunError( TInt aError );
+		
+		/**
+		*	Method to get called when active object request has been completed.
+		*	@param	None
+		*	@return	None
+		*/
+		void RunL();
+		
+		/**
+		*	Method to handle actual actions required after Cancel-method has been called.
+		*/
+		void DoCancel();
+			
+	private: // instance variables
+		/**
+		*	Handle to the file server session
+		*/
+		RFs iFs;
+		/**
+		*	Timer to use when monitoring open files
+		*/
+		RTimer iTimeWaster;
+		
+		/**
+		*	Name of the old file that is to be replaced
+		*/
+		TFileName iOldFileName;
+		
+		/**
+		*	Name of the file to be used to replace iOldFileName
+		*/
+		TFileName iNewFileName;
+		
+		/**
+		*	Backup session to signalize all observers to release handle to
+		*	iOldFileName and iNewFileName
+		*/
+		CBaBackupSessionWrapper* iBackupWrapper;
+		
+		/**
+		*	Reference to the class that observes the file swapping
+		*/
+		MIptvEpgFileSwapObserver& iSwapObserver;
+		
+		TInt iSwapTriesAmount;
+	};
+	
+#endif // __CIPTVEPGFILESWAPPER_H