DefaultEventLoader.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2017 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/Axis.h"
#include "MantidDataHandling/DllConfig.h"
#include "MantidDataHandling/EventWorkspaceCollection.h"
 
class BankPulseTimes;
 
namespace Mantid {
namespace DataHandling {
class LoadEventNexus;
 
class MANTID_DATAHANDLING_DLL DefaultEventLoader {
public:
  static void load(LoadEventNexus *alg, EventWorkspaceCollection &ws, bool haveWeights, bool event_id_is_spec,
                   std::vector<std::string> bankNames, const std::vector<int> &periodLog, const std::string &classType,
                   std::vector<std::size_t> bankNumEvents, const bool oldNeXusFileNames, const bool precount,
                   const int chunk, const int totalChunks);
 
  bool m_haveWeights;
 
  bool event_id_is_spec;
 
  bool splitProcessing;
 
  bool precount;
 
  detid_t pixelID_to_wi_offset;
 
  int32_t eventid_max{0};
 
  int chunk;
  int totalChunks;
  int firstChunkForBank;
  size_t eventsPerChunk;
 
  LoadEventNexus *alg;
  EventWorkspaceCollection &m_ws;
 
  std::vector<std::vector<std::vector<Mantid::Types::Event::TofEvent> *>> eventVectors;
 
  std::vector<std::vector<std::vector<Mantid::DataObjects::WeightedEvent> *>> weightedEventVectors;
 
  std::vector<size_t> pixelID_to_wi_vector;
 
  std::vector<std::shared_ptr<BankPulseTimes>> m_bankPulseTimes;
 
private:
  DefaultEventLoader(LoadEventNexus *alg, EventWorkspaceCollection &ws, bool haveWeights, bool event_id_is_spec,
                     const size_t numBanks, const bool precount, const int chunk, const int totalChunks);
  std::pair<size_t, size_t> setupChunking(std::vector<std::string> &bankNames, std::vector<std::size_t> &bankNumEvents);
  template <class T> void makeMapToEventLists(std::vector<std::vector<T>> &vectors);
};
 
template <class T> void DefaultEventLoader::makeMapToEventLists(std::vector<std::vector<T>> &vectors) {
  vectors.resize(m_ws.nPeriods());
  if (event_id_is_spec) {
    // Find max spectrum no
    auto *ax1 = m_ws.getAxis(1);
    specnum_t maxSpecNo = -std::numeric_limits<specnum_t>::max(); // So that any number will be
                                                                  // greater than this
    for (size_t i = 0; i < ax1->length(); i++) {
      specnum_t spec = ax1->spectraNo(i);
      if (spec > maxSpecNo)
        maxSpecNo = spec;
    }
 
    // These are used by the bank loader to figure out where to put the events
    // The index of eventVectors is a spectrum number so it is simply resized to
    // the maximum
    // possible spectrum number
    eventid_max = maxSpecNo;
    for (size_t i = 0; i < vectors.size(); ++i) {
      vectors[i].resize(maxSpecNo + 1, nullptr);
    }
    for (size_t period = 0; period < m_ws.nPeriods(); ++period) {
      for (size_t i = 0; i < m_ws.getNumberHistograms(); ++i) {
        const auto &spec = m_ws.getSpectrum(i);
        getEventsFrom(m_ws.getSpectrum(i, period), vectors[period][spec.getSpectrumNo()]);
      }
    }
  } else {
    // To avoid going out of range in the vector, this is the MAX INDEX that can
    // go into it
    eventid_max = static_cast<int32_t>(pixelID_to_wi_vector.size() - 1 - pixelID_to_wi_offset);
 
    // Make an array where index = pixel ID
    // Set the value to NULL by default
    for (size_t i = 0; i < vectors.size(); ++i) {
      vectors[i].resize(eventid_max + 1, nullptr);
    }
 
    for (size_t j = 0; j < pixelID_to_wi_vector.size(); j++) {
      size_t wi = pixelID_to_wi_vector[j];
      // Save a POINTER to the vector
      if (wi < m_ws.getNumberHistograms()) {
        for (size_t period = 0; period < m_ws.nPeriods(); ++period) {
          getEventsFrom(m_ws.getSpectrum(wi, period), vectors[period][j - pixelID_to_wi_offset]);
        }
      }
    }
  }
}
 
} // namespace DataHandling
} // namespace Mantid