LoadNGEM.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2019 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
#include "MantidAPI/IFileLoader.h"
#include "MantidDataHandling/DllConfig.h"
#include "MantidDataObjects/EventWorkspace.h"
#include "MantidKernel/FileDescriptor.h"
 
namespace Mantid {
namespace DataHandling {
 
static constexpr uint64_t CONTIN_ID_VALUE = 0x4F;
static constexpr uint64_t EVENT_ID_MASK = 0x40;
 
struct GenericEvent {
  uint64_t t0id : 24;      // T0 ID
  uint64_t reserved2 : 32; // Reserved for non-generics
  uint64_t contin : 8;     // 0x4F Continuation Code
  uint64_t reserved1 : 56; // Reserved for non-generics
  uint64_t id : 8;         // Event ID
  bool check() const {
    // as id is 8 bit, we can do a simple AND to check
    return (id & EVENT_ID_MASK) != 0 && contin == CONTIN_ID_VALUE;
  }
};
 
struct T0FrameEvent {
  uint64_t t0id : 24;       // T0 ID
  uint64_t eventCount : 32; // Event Count
  uint64_t contin : 8;      // 0x4F Continuation Code
  uint64_t totalLoss : 24;  // Total loss count
  uint64_t eventLoss : 20;  // Event loss count
  uint64_t frameLoss : 12;  // Frame loss count
  uint64_t id : 8;          // 0x4E Event ID
  static constexpr int T0_IDENTIFIER = 0x4E;
  bool check() const { return id == T0_IDENTIFIER && contin == CONTIN_ID_VALUE; }
};
 
struct CoincidenceEvent {
  uint64_t t0id : 24;         // T0 ID
  uint64_t clusterTimeY : 10; // Integrated time of the cluster on the Y side
                              // (5ns pixel)
  uint64_t timeDiffY : 6;     // Time lag from first to last detection on Y (5ns)
  uint64_t clusterTimeX : 10; // Integrated time of the cluster on the X side
                              // (5ns pixel)
  uint64_t timeDiffX : 6;     // Time lag from first to last detection on X (5ns)
  uint64_t contin : 8;        // 0x4F Continuation Code
  uint64_t lastY : 7;         // Y position of pixel detected last
  uint64_t firstY : 7;        // Y position of pixel detected first
  uint64_t lastX : 7;         // X position of pixel detected last
  uint64_t firstX : 7;        // X position of pixel detected first
  uint64_t timeOfFlight : 28; // Difference between T0 and detection (1ns)
  uint64_t id : 8;            // 0x47 Event ID.
 
  uint64_t avgX() const { return (firstX + lastX) / 2; }
  uint64_t avgY() const { return (firstY + lastY) / 2; }
  static constexpr int COINCIDENCE_IDENTIFIER = 0x47;
  bool check() { return id == COINCIDENCE_IDENTIFIER && contin == CONTIN_ID_VALUE; }
  uint64_t getPixel() const {
    return avgX() + (avgY() << 7); // Increase Y significance by 7 bits to
                                   // account for 128x128 grid.
  }
};
 
struct DetectorWord {
  uint64_t words[2]; // Array holding the word from the detector split in two.
};
 
union EventUnion {
  GenericEvent generic;
  T0FrameEvent tZero;
  CoincidenceEvent coincidence;
  DetectorWord splitWord;
};
 
class MANTID_DATAHANDLING_DLL LoadNGEM : public API::IFileLoader<Kernel::FileDescriptor> {
public:
  const std::string name() const override { return "LoadNGEM"; }
  const std::string summary() const override {
    return "Load a file or range of files created by the nGEM detector into a "
           "workspace.";
  };
  int version() const override { return 1; }
  const std::string category() const override { return "DataHandling\\NGEM"; };
  bool loadMutipleAsOne() override { return true; }
 
  int confidence(Kernel::FileDescriptor &descriptor) const override;
 
private:
  void init() override;
  void exec() override;
  void loadSingleFile(const std::vector<std::string> &filePath, int &eventCountInFrame, double &maxToF, double &minToF,
                      int &rawFrames, int &goodFrames, const int &minEventsReq, const int &maxEventsReq,
                      MantidVec &frameEventCounts, std::vector<DataObjects::EventList> &events,
                      std::vector<DataObjects::EventList> &eventsInFrame, const size_t &totalFilePaths, int &fileCount);
  size_t verifyFileSize(std::ifstream &file);
  bool reportProgressAndCheckCancel(size_t &numProcessedEvents, int &eventCountInFrame, const size_t &totalNumEvents,
                                    const size_t &totalFilePaths, const int &fileCount);
  void createCountWorkspace(const std::vector<double> &frameEventCounts);
  void loadInstrument(DataObjects::EventWorkspace_sptr &dataWorkspace);
  std::map<std::string, std::string> validateInputs() override;
};
 
} // namespace DataHandling
} // namespace Mantid