DetectionElements.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_CONSTANTS_DETECTION_ELEMENTS_H
#define O2_MCH_CONSTANTS_DETECTION_ELEMENTS_H
 
#include <algorithm>
#include <array>
#include <optional>
#include <unordered_map>
 
namespace o2::mch::constants
{
 
inline std::array<int, 156> deIdsForAllMCH = {
  100, 101, 102, 103,
  200, 201, 202, 203,
  300, 301, 302, 303,
  400, 401, 402, 403,
  500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517,
  600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617,
  700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725,
  800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825,
  900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 915, 916, 917, 918, 919, 920, 921, 922, 923, 924, 925,
  1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023, 1024, 1025};
 
inline bool isValidDetElemId(int deId)
{
  return std::find(begin(deIdsForAllMCH), end(deIdsForAllMCH), deId) != deIdsForAllMCH.end();
}
 
inline std::optional<int> deId2DeIndex(int deId)
{
  if (!o2::mch::constants::isValidDetElemId(deId)) {
    return std::nullopt;
  }
  static const std::unordered_map<int, int> id2ix = {
    {100, 0},
    {200, 4},
    {300, 8},
    {400, 12},
    {500, 16},
    {600, 34},
    {700, 52},
    {800, 78},
    {900, 104},
    {1000, 130},
    {1025, 155}};
 
  int firstDeOfChamber = 100 * (deId / 100);
  auto firstIndexOfChamber = id2ix.find(firstDeOfChamber);
  return firstIndexOfChamber->second + (deId - firstDeOfChamber);
}
 
} // namespace o2::mch::constants
 
#endif