/daten/ahuesgen/projects/vhist/code/vhistlib/include/unvhistlib/fileiterator.h

/* $HEADERS
 $Id: fileiterator.h 2791 2013-05-06 11:24:28Z michael $
 */

#ifndef FILEITERATOR_INCLUDED
#define FILEITERATOR_INCLUDED

#include "../shared/misc_defines.h"

#include <QString>
#include <QByteArray>
#include <QList>
#include <QSharedPointer>
#include <QFileInfo>


//#include "../shared/maybe.tpl"

class QFile;

namespace vhist
{

typedef QList<QByteArray> QByteArrays;
typedef QSharedPointer<QString> MaybeString;
typedef QSharedPointer<QByteArray> MaybeArray;

class VHIST_EXTERN FileIterator
{
    public: // construction, destruction and assignment
        FileIterator();
        ~FileIterator();
        
    public:
        bool open(const QString& filename);
        bool nextLine();
        bool prevLine();
        bool firstLine();
        bool lastLine();
        
        bool reachedStart();
        bool reachedEnd();
        bool onLine();
        bool empty();
        bool gotoPos(int pos);
        
        MaybeArray curLine();
        MaybeString curLineAsString();
        int curPos();
        QByteArray getBytes(int startPos, int numBytes);
        
    public:
        bool curLineStartsWithBytes(const char* str);

    private:
        bool containsNulls(const QByteArray& line);
        void closeFile();
        int getFileSize();

        bool getFirstBuffer();
        bool getLastBuffer();
        bool getNextBuffer();
        bool getPrevBuffer();
        bool getBuffer(int pos);
        
        bool searchForwards();
        bool searchBackwards();
    
    private:
        QFile* m_file;
        QFileInfo m_finfo;
        QByteArray m_buffer;
        QByteArray m_curLine;
        int m_startOfLine;
        int m_bufferStart;
        int m_posInBuffer;
};


} // namespace


#endif // FILEITERATOR_INCLUDED