Celestia

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// trajmanager.cpp
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//
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// Copyright (C) 2001-2008 Chris Laurel <claurel@gmail.com>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include "trajmanager.h"
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#include <utility>
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#include <celephem/samporbit.h>
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namespace celestia::engine
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{
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std::shared_ptr<const ephem::Orbit>
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TrajectoryManager::find(const fs::path& source,
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                        const fs::path& path,
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                        ephem::TrajectoryInterpolation interpolation,
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                        ephem::TrajectoryPrecision precision)
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{
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    auto filename = path.empty()
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        ? "data" / source
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        : path / "data" / source;
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    auto it = orbits.try_emplace(Key { std::move(filename), interpolation, precision }).first;
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    if (auto cachedOrbit = it->second.lock(); cachedOrbit != nullptr)
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        return cachedOrbit;
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    auto orbit = ephem::LoadSampledTrajectory(it->first.path, interpolation, precision);
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    if (orbit == nullptr)
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    {
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        orbits.erase(it);
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        return nullptr;
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    }
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    it->second = orbit;
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    return orbit;
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}
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TrajectoryManager*
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GetTrajectoryManager()
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{
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    static TrajectoryManager* const manager = std::make_unique<TrajectoryManager>().release(); //NOSONAR
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    return manager;
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}
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} // end namespace celestia::engine
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