// tail.h

// 

// Copyright (c) 2005 - 2010 Accenture. All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the "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:

// Accenture - Initial contribution

//

#include <fshell/ioutils.h>

#include "file_reader.h"

#include "character_converter.h"

using namespace IoUtils;

class CFileWatcher;

class CTrailingLineFinder;

class MTrailingLineFinderObserver

	{

public:

	virtual void HandleTrailingLines(TInt aNumLinesFound, TInt aEndFilePos) = 0;

	virtual void HandleTrailingLineError(TInt aError) = 0;

	};

class MFileChangeObserver

	{

public:

	virtual void HandleFileChange(const TDesC& aFileName) = 0;

	};

class CCmdTail : public CCommandBase, public MTrailingLineFinderObserver, public MFileChangeObserver, public MFileReaderObserver

	{

public:

	static CCommandBase* NewLC();

	~CCmdTail();

private:

	CCmdTail();

	void ConstructL();

	void WriteChunkToConsoleL(const TDesC8& aData, TReadType aType);

private: // From CCommandBase.

	virtual const TDesC& Name() const;

	virtual void DoRunL();

	virtual void OptionsL(RCommandOptionList& aOptions);

	virtual void ArgumentsL(RCommandArgumentList& aArguments);

private: // From MTrailingLineFinderObserver.

	virtual void HandleTrailingLines(TInt aNumLinesFound, TInt aEndFilePos);

	virtual void HandleTrailingLineError(TInt aError);

private: // From MFileChangeObserver.

	virtual void HandleFileChange(const TDesC& aFileName);

private: // From MFileReaderObserver.

	virtual void HandleFileData(const TDesC8& aData, TReadType aType, TBool& aContinue);

	virtual void HandleFileReadError(TInt aError);

private:

	TFileName2 iFileName;

	CCharacterConverter* iCharacterConverter;

	CTrailingLineFinder* iTrailingLineFinder;

	CFileWatcher* iFileWatcher;

	CFileReader* iFileReader;

	TBool iFollow;

	TInt iNumLines;

	TInt iFilePos;

	};