DigitSampler.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#ifndef O2_MCH_DEVIO_DIGITS_DIGIT_READER_H
#define O2_MCH_DEVIO_DIGITS_DIGIT_READER_H
 
#include <iosfwd>
#include "DigitFileFormat.h"
#include <vector>
#include <memory>
 
namespace o2::mch
{
class Digit;
class ROFRecord;
} // namespace o2::mch
 
namespace o2::mch::io
{
namespace impl
{
class DigitSamplerImpl;
}
class DigitSampler
{
 public:
  DigitSampler(std::istream& in);
 
  /* defined in the implementation file, where mImpl is a complete type */
  ~DigitSampler();
 
  DigitFileFormat fileFormat() const { return mFileFormat; }
 
  bool read(std::vector<Digit>& digits,
            std::vector<ROFRecord>& rofs);
 
  size_t nofTimeFrames() const;
 
  size_t nofROFs() const;
 
  size_t nofDigits() const;
 
  void rewind();
 
 private:
  void count() const;
 
 private:
  std::istream& mInput;
  DigitFileFormat mFileFormat;
  std::unique_ptr<impl::DigitSamplerImpl> mImpl;
  mutable size_t mNofTimeFrames{0};
  mutable size_t mNofROFs{0};
  mutable size_t mNofDigits{0};
  mutable bool mCountDone{false};
};
 
} // namespace o2::mch::io
 
#endif