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 // This file is part of the Acts project.
 //
 // Copyright (C) 2017-2020 CERN for the benefit of the Acts project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #include "ActsExamples/MaterialMapping/MaterialMapping.hpp"
 
 #include "Acts/Material/AccumulatedMaterialSlab.hpp"
 #include "Acts/Material/AccumulatedSurfaceMaterial.hpp"
 #include "ActsExamples/MaterialMapping/IMaterialWriter.hpp"
 
 #include <iostream>
 #include <stdexcept>
 #include <unordered_map>
 
 namespace ActsExamples {
 
 MaterialMapping::MaterialMapping(const MaterialMapping::Config& cfg,
                                  Acts::Logging::Level level)
     : IAlgorithm("MaterialMapping", level),
       m_cfg(cfg),
       m_mappingState(cfg.geoContext, cfg.magFieldContext),
       m_mappingStateVol(cfg.geoContext, cfg.magFieldContext) {
   if (!m_cfg.materialSurfaceMapper && !m_cfg.materialVolumeMapper) {
     throw std::invalid_argument("Missing material mapper");
   } else if (!m_cfg.trackingGeometry) {
     throw std::invalid_argument("Missing tracking geometry");
   }
 
   m_inputMaterialTracks.initialize(m_cfg.inputMaterialTracks);
   m_outputMaterialTracks.initialize(m_cfg.mappingMaterialCollection);
 
   ACTS_INFO("This algorithm requires inter-event information, "
             << "run in single-threaded mode!");
 
   if (m_cfg.materialSurfaceMapper) {
     // Generate and retrieve the central cache object
     m_mappingState = m_cfg.materialSurfaceMapper->createState(
         m_cfg.geoContext, m_cfg.magFieldContext, *m_cfg.trackingGeometry);
   }
   if (m_cfg.materialVolumeMapper) {
     // Generate and retrieve the central cache object
     m_mappingStateVol = m_cfg.materialVolumeMapper->createState(
         m_cfg.geoContext, m_cfg.magFieldContext, *m_cfg.trackingGeometry);
   }
 }
 
 MaterialMapping::~MaterialMapping() {
   Acts::DetectorMaterialMaps detectorMaterial;
 
   if (m_cfg.materialSurfaceMapper && m_cfg.materialVolumeMapper) {
     // Finalize all the maps using the cached state
     m_cfg.materialSurfaceMapper->finalizeMaps(m_mappingState);
     m_cfg.materialVolumeMapper->finalizeMaps(m_mappingStateVol);
     // Loop over the state, and collect the maps for surfaces
     for (auto& [key, value] : m_mappingState.surfaceMaterial) {
       detectorMaterial.first.insert({key, std::move(value)});
     }
     // Loop over the state, and collect the maps for volumes
     for (auto& [key, value] : m_mappingStateVol.volumeMaterial) {
       detectorMaterial.second.insert({key, std::move(value)});
     }
   } else {
     if (m_cfg.materialSurfaceMapper) {
       // Finalize all the maps using the cached state
       m_cfg.materialSurfaceMapper->finalizeMaps(m_mappingState);
       // Loop over the state, and collect the maps for surfaces
       for (auto& [key, value] : m_mappingState.surfaceMaterial) {
         detectorMaterial.first.insert({key, std::move(value)});
       }
       // Loop over the state, and collect the maps for volumes
       for (auto& [key, value] : m_mappingState.volumeMaterial) {
         detectorMaterial.second.insert({key, std::move(value)});
       }
     }
     if (m_cfg.materialVolumeMapper) {
       // Finalize all the maps using the cached state
       m_cfg.materialVolumeMapper->finalizeMaps(m_mappingStateVol);
       // Loop over the state, and collect the maps for surfaces
       for (auto& [key, value] : m_mappingStateVol.surfaceMaterial) {
         detectorMaterial.first.insert({key, std::move(value)});
       }
       // Loop over the state, and collect the maps for volumes
       for (auto& [key, value] : m_mappingStateVol.volumeMaterial) {
         detectorMaterial.second.insert({key, std::move(value)});
       }
     }
   }
   // Loop over the available writers and write the maps
   for (auto& imw : m_cfg.materialWriters) {
     imw->writeMaterial(detectorMaterial);
   }
 }
 
 ProcessCode MaterialMapping::execute(const AlgorithmContext& context) const {
   // Take the collection from the EventStore
   std::unordered_map<std::size_t, Acts::RecordedMaterialTrack>
       mtrackCollection = m_inputMaterialTracks(context);
 
   if (m_cfg.materialSurfaceMapper) {
     // To make it work with the framework needs a lock guard
     auto mappingState =
         const_cast<Acts::SurfaceMaterialMapper::State*>(&m_mappingState);
     for (auto& [idTrack, mTrack] : mtrackCollection) {
       // Map this one onto the geometry
       m_cfg.materialSurfaceMapper->mapMaterialTrack(*mappingState, mTrack);
     }
   }
   if (m_cfg.materialVolumeMapper) {
     // To make it work with the framework needs a lock guard
     auto mappingState =
         const_cast<Acts::VolumeMaterialMapper::State*>(&m_mappingStateVol);
 
     for (auto& [idTrack, mTrack] : mtrackCollection) {
       // Map this one onto the geometry
       m_cfg.materialVolumeMapper->mapMaterialTrack(*mappingState, mTrack);
     }
   }
   // Write take the collection to the EventStore
   m_outputMaterialTracks(context, std::move(mtrackCollection));
   return ProcessCode::SUCCESS;
 }
 
 std::vector<std::pair<double, int>> MaterialMapping::scoringParameters(
     uint64_t surfaceID) {
   std::vector<std::pair<double, int>> scoringParameters;
 
   if (m_cfg.materialSurfaceMapper) {
     auto surfaceAccumulatedMaterial = m_mappingState.accumulatedMaterial.find(
         Acts::GeometryIdentifier(surfaceID));
 
     if (surfaceAccumulatedMaterial !=
         m_mappingState.accumulatedMaterial.end()) {
       auto matrixMaterial =
           surfaceAccumulatedMaterial->second.accumulatedMaterial();
       for (const auto& vectorMaterial : matrixMaterial) {
         for (const auto& AccumulatedMaterial : vectorMaterial) {
           auto totalVariance = AccumulatedMaterial.totalVariance();
           scoringParameters.push_back(
               {totalVariance.first, totalVariance.second});
         }
       }
     }
   }
   return scoringParameters;
 }
 
 }  // namespace ActsExamples

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