TDbiBinaryFile.hxx

Go to the documentation of this file.

#ifndef DBIBINARYFILE_H
#define DBIBINARYFILE_H

/**
 *
 * \class TDbiBinaryFile
 *
 *
 * \brief
 * <b>Concept</b> Binary file for reading/writing TDbi related objects.
 *
 * \brief
 * <b>Purpose</b> To save/restore cache to speed up startup when running
 *   in the same context.
 *
 * Contact: A.Finch@lancaster.ac.uk
 *
 *
 */


#include <fstream>
using std::fstream;
using std::ios_base;

#include <string>
using std::string;

#include <vector>
using std::vector;

#ifndef ROOT_Rtypes
#if !defined(__CINT__) || defined(__MAKECINT__)
#include "Rtypes.h"
#endif
#endif


class TDbiTableRow;
class TVldTimeStamp;
class TVldRange;
class TDbiBinaryFile
{

public:
///
///\verbatim
///  Purpose:  Default Constructor.
///
///  Arguments:
///    fileName     in    File name (default: "" => file is a dummy)
///    input        in    true if reading (default = kTRUE)
///
///  Specification:-
///  =============
///
///  If file name or fgWorkDir is dummy, or the appropriate access is not set
///\endverbatim                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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/  then name is set to dummy otherwise fgWorkDir is prepended to the name.

  TDbiBinaryFile(const char* fileName= "",
                Bool_t input = kTRUE);
  ~TDbiBinaryFile();

// State testing.

  string  GetFileName() const { return fFileName; }
  Bool_t  IsOK() const { return ! fHasErrors;}
  Bool_t  IsReading() const { return this->IsOK() && fReading; }
  Bool_t  IsWriting() const { return this->IsOK() && ! fReading; }

// State changing.

  void Close();

/// Builtin data type I/O.

  TDbiBinaryFile& operator >> (Bool_t& num);
  TDbiBinaryFile& operator << (const Bool_t& num);
  TDbiBinaryFile& operator >> (Int_t& num);
  TDbiBinaryFile& operator << (const Int_t& num);
  TDbiBinaryFile& operator >> (UInt_t& num);
  TDbiBinaryFile& operator << (const UInt_t& num);
  TDbiBinaryFile& operator >> (Double_t& num);
  TDbiBinaryFile& operator << (const Double_t& num);

/// Simple Virtual object I/O.
/// (i.e. object with vptr but only built-in data types)

  TDbiBinaryFile& operator >> (TVldTimeStamp& ts);
  TDbiBinaryFile& operator << (const TVldTimeStamp& ts);

/// String I/O.
/// Warning: Implimentation assumes that string does not contain
///          a null character.

  TDbiBinaryFile& operator >> (string& str);
  TDbiBinaryFile& operator << (const string& str);

/// Compound object I/O.

  TDbiBinaryFile& operator >> (TVldRange& vr);
  TDbiBinaryFile& operator << (const TVldRange& vr);

/// Vector I/O.

  TDbiBinaryFile& operator >>  (vector<TDbiTableRow*>& arr);
  TDbiBinaryFile& operator <<  (vector<TDbiTableRow*>& arr);
  char* ReleaseArrayBuffer() { char* buff = fArrayBuffer;
                               fArrayBuffer = 0;
                               return buff; }

/// Global control of all created TDbiBinaryFile objects.

  static Bool_t CanReadL2Cache()  { return fgWorkDir.size() && fgReadAccess; }
  static Bool_t CanWriteL2Cache() { return fgWorkDir.size() && fgWriteAccess; }
  static   void SetWorkDir(const string& dir) { fgWorkDir = dir;
                  if ( fgWorkDir[fgWorkDir.size()-1] != '/' ) fgWorkDir += '/'; }
  static   void SetReadAccess(Bool_t access = kTRUE) { fgReadAccess = access; }
  static   void SetWriteAccess(Bool_t access = kTRUE) { fgWriteAccess = access; }

private:

/// The functions that do the low-level I/O.

 Bool_t CanRead();
 Bool_t CanWrite();
   void CheckFileStatus();

 Bool_t Read(char* bytes, UInt_t numBytes);
 Bool_t Write(const char* bytes, UInt_t numBytes);

// CINT does not recognise fstream; only ifstream and ofstream.
#if !defined(__CINT__)

/// Associated file, may be null.
  fstream*  fFile;
#endif

 Bool_t   fReading;
 Bool_t   fHasErrors;
 char*    fArrayBuffer;
 string   fFileName;

 static string fgWorkDir;    //Level 2 Cache directory or null if none.
 static Bool_t fgReadAccess; //Have read access if true.
 static Bool_t fgWriteAccess;//Have write access if true.

};


#endif  // DBIBINARYFILE_HfArrayBuffer