1 // tail.h

     2 // 

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

     4 // This component and the accompanying materials are made available

     5 // under the terms of the "Eclipse Public License v1.0"

     6 // which accompanies this distribution, and is available

     7 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 // 

     9 // Initial Contributors:

    10 // Accenture - Initial contribution

    11 //

    12 

    13 #include <fshell/ioutils.h>

    14 #include "file_reader.h"

    15 #include "character_converter.h"

    16 

    17 using namespace IoUtils;

    18 

    19 class CFileWatcher;

    20 class CTrailingLineFinder;

    21 

    22 

    23 class MTrailingLineFinderObserver

    24 	{

    25 public:

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

    27 	virtual void HandleTrailingLineError(TInt aError) = 0;

    28 	};

    29 

    30 

    31 class MFileChangeObserver

    32 	{

    33 public:

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

    35 	};

    36 

    37 

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

    39 	{

    40 public:

    41 	static CCommandBase* NewLC();

    42 	~CCmdTail();

    43 private:

    44 	CCmdTail();

    45 	void ConstructL();

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

    47 private: // From CCommandBase.

    48 	virtual const TDesC& Name() const;

    49 	virtual void DoRunL();

    50 	virtual void OptionsL(RCommandOptionList& aOptions);

    51 	virtual void ArgumentsL(RCommandArgumentList& aArguments);

    52 private: // From MTrailingLineFinderObserver.

    53 	virtual void HandleTrailingLines(TInt aNumLinesFound, TInt aEndFilePos);

    54 	virtual void HandleTrailingLineError(TInt aError);

    55 private: // From MFileChangeObserver.

    56 	virtual void HandleFileChange(const TDesC& aFileName);

    57 private: // From MFileReaderObserver.

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

    59 	virtual void HandleFileReadError(TInt aError);

    60 private:

    61 	TFileName2 iFileName;

    62 	CCharacterConverter* iCharacterConverter;

    63 	CTrailingLineFinder* iTrailingLineFinder;

    64 	CFileWatcher* iFileWatcher;

    65 	CFileReader* iFileReader;

    66 	TBool iFollow;

    67 	TInt iNumLines;

    68 	TInt iFilePos;

    69 	};