AthenaRootStreamer.h

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/*
  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef ATHENAPOOLSERVICES_ATHENAROOTSTREAMER_H
#define ATHENAPOOLSERVICES_ATHENAROOTSTREAMER_H
 
#include "GaudiKernel/StatusCode.h"
 
#include "TClassStreamer.h"
 
#include <string>
#include <map>
#include <set>
#include <memory>
 
class TFile;
class Service;
class AthenaRootConverterHandle;
 
class AthenaRootStreamer : public TClassStreamer
{
public:
  AthenaRootStreamer(const std::string& class_name, ::Service* service=0);
 
  virtual ~AthenaRootStreamer();
 
  StatusCode AddConverter(std::unique_ptr<AthenaRootConverterHandle> converter);
 
   StatusCode Adopt();
  
  virtual void operator()(TBuffer& b, void* obj);
 
protected:
   static Version_t R__FindStreamerInfoVersion(const TClass* cl, UInt_t checksum);
   void FindVersion(TBuffer* buf, UInt_t* startpos, UInt_t* bcnt);
 
private:
  std::string m_className;
  TClass*     m_class;
  UInt_t      m_streamerChecksum;   // retrieved by FindVersion from the file
  Version_t   m_streamerVersion;    // retrieved by FindVersion from the file
  TFile*      m_lastFile;
 
  typedef std::map<UInt_t, std::unique_ptr<AthenaRootConverterHandle> > ConverterMap;
  ConverterMap  m_converterMap;     // set of converters for this class
 
  typedef std::set<UInt_t>  ChecksumSet;
  ChecksumSet   m_seenChecksums;    // unknown streamer checksums seen in files
 
  Service*  m_service;          //AthenaRootStreamerMgrSvc
};
 
#endif