DD4hepLayerBuilder.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2017-2018 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/.

#pragma once

#include "Acts/Geometry/ILayerBuilder.hpp"
#include "Acts/Geometry/LayerCreator.hpp"
#include "Acts/Surfaces/Surface.hpp"
#include "Acts/Utilities/BinUtility.hpp"
#include "Acts/Utilities/Definitions.hpp"
#include "Acts/Utilities/Logger.hpp"
#include "Acts/Utilities/Units.hpp"

class TGeoMatrix;

namespace dd4hep {
class DetElement;
}

namespace Acts {


class DD4hepLayerBuilder : public ILayerBuilder {
 public:
  struct Config {
    std::string configurationName = "undefined";
    std::shared_ptr<const LayerCreator> layerCreator = nullptr;
    BinningType bTypePhi = equidistant;
    BinningType bTypeR = equidistant;
    BinningType bTypeZ = equidistant;
    std::vector<dd4hep::DetElement> negativeLayers;
    std::vector<dd4hep::DetElement> centralLayers;
    std::vector<dd4hep::DetElement> positiveLayers;
    double defaultThickness = UnitConstants::fm;
  };

  DD4hepLayerBuilder(const Acts::DD4hepLayerBuilder::Config& config,
                     std::unique_ptr<const Logger> logger);
  ~DD4hepLayerBuilder() override;

  const LayerVector negativeLayers(const GeometryContext& gctx) const final;

  const LayerVector centralLayers(const GeometryContext& gctx) const final;

  const LayerVector positiveLayers(const GeometryContext& gctx) const final;

  const std::string& identification() const final;

  void setConfiguration(const Config& config);

  Config getConfiguration() const;

  void setLogger(std::unique_ptr<const Logger> logger);

 private:
  Config m_cfg;

  std::unique_ptr<const Logger> m_logger;

  const Logger& logger() const { return *m_logger; }

  const LayerVector endcapLayers(
      const GeometryContext& gctx,
      const std::vector<dd4hep::DetElement>& dendcapLayers,
      const std::string& side) const;

  void resolveSensitive(
      const dd4hep::DetElement& detElement,
      std::vector<std::shared_ptr<const Acts::Surface>>& surfaces) const;

  std::shared_ptr<const Acts::Surface> createSensitiveSurface(
      const dd4hep::DetElement& detElement, bool isDisc = false) const;

  // Private helper function to convert the TGeo transformation matrix into
  // an Acts transformation matrix
  // @param tGeoTrans TGeo transformation matrix which should be converted
  Acts::Transform3D convertTransform(const TGeoMatrix* tGeoTrans) const;
};

inline const std::string& DD4hepLayerBuilder::identification() const {
  return m_cfg.configurationName;
}

inline DD4hepLayerBuilder::Config DD4hepLayerBuilder::getConfiguration() const {
  return m_cfg;
}

}  // namespace Acts