SHiPGeometryService.h

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// SPDX-FileCopyrightText: 2025 CERN for the benefit of the SHiP Collaboration
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include "GeometryService/IGeometryService.h"
 
#include <GeoModelKernel/GeoVPhysVol.h>
#include <exception>
#include <filesystem>
#include <memory>
#include <mutex>
#include <string>
 
class G4LogicalVolume;
 
namespace ship {
 
class SHiPGeometryService final : public IGeometryService {
   public:
    [[nodiscard]] static std::unique_ptr<SHiPGeometryService> fromSource();
 
    [[nodiscard]] static std::unique_ptr<SHiPGeometryService> fromFile(
        const std::filesystem::path& dbPath);
 
    [[nodiscard]] static std::shared_ptr<SHiPGeometryService> sharedFromFile(
        const std::filesystem::path& dbPath);
 
    [[nodiscard]] static std::unique_ptr<SHiPGeometryService> fromWorld(PVConstLink world);
 
    ~SHiPGeometryService() override = default;
 
    // Non-copyable and non-movable (std::once_flag member; instances are
    // only handed out via unique_ptr, so moves are not needed).
    SHiPGeometryService(const SHiPGeometryService&) = delete;
    SHiPGeometryService& operator=(const SHiPGeometryService&) = delete;
    SHiPGeometryService(SHiPGeometryService&&) = delete;
    SHiPGeometryService& operator=(SHiPGeometryService&&) = delete;
 
    const GeoVPhysVol* geoModelWorld() const override;
    G4LogicalVolume* geant4WorldLogical() override;
    G4LogicalVolume* getLogicalVolume(const std::string& name) const override;
 
   private:
    SHiPGeometryService() = default;
 
    PVConstLink m_world;  
    mutable std::once_flag m_g4ConversionDone;
    G4LogicalVolume* m_g4WorldLV{nullptr};  
    std::exception_ptr m_conversionError;   
};
 
}  // namespace ship