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RRawStream.h

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/*
 *
 *   RRawStream, input stream for rraw type raw data.
 *   It provides some similar operations like ifstream to handle root TTree.
 *   BTW rraw is just root tree.
 *
 *   Zhe Wang
 *   Feb. 10, 2010 at BNL
 *
 */

#ifndef _RRAW_STREAM_H_
#define _RRAW_STREAM_H_

#include "IInputStream.h"
#include <iostream>
#include <fstream>
#include "TFile.h"
#include "TTree.h"

using namespace std;

// Must be 32 bits to be consistent with online DAQ system
typedef Int_t Int32;  

class RRawStream:public IInputStream
{
 public:
  RRawStream();
  RRawStream( const char * filename );
  virtual ~RRawStream();

  void close ( );
  void open ( const char * filename );
  bool is_open ( ) const ;
  bool good ( ) const;

  bool operator ! ( ) const;

  RRawStream& read ( char* s, int n );
  RRawStream& ignore ( int n = 1 );

 private:

  TFile *m_file;
  TTree *m_tree;

  Int32 m_buffer[50000];
  Int32 m_size;

  // current entry number in the tree
  Int32 m_currentEntry;

  // current pointer position in current entry counted by char
  Int32 m_currentPosi;

  // Mark true if reach the end of one entry, and read in anothor new entry.  
  bool m_entryEnd;
};

#endif  // _RRAW_STREAM_H_



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