Metadata.hpp

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#pragma once
 
#include <optional>
 
#include <nlohmann/json.hpp>
 
#include "vc/core/filesystem.hpp"
#include "vc/core/util/Json.hpp"
 
namespace volcart
{
class Metadata
{
 
public:
    Metadata() = default;
 
    explicit Metadata(const filesystem::path& fileLocation);
    [[nodiscard]] auto path() const -> filesystem::path;
 
    void setPath(const filesystem::path& path);
 
    void save() const;
 
    void save(const filesystem::path& path) const;
    [[nodiscard]] auto hasKey(const std::string& key) const -> bool;
 
    template <typename T>
    auto get(const std::string& key) const -> std::optional<T>
    {
        if (not json_.contains(key)) {
            const auto msg = "could not find key '" + key + "' in metadata";
            throw std::runtime_error(msg);
        }
 
        if (json_[key].is_null()) {
            return std::optional<T>();
        }
 
        return json_[key].get<T>();
    }
 
    template <typename T>
    void set(const std::string& key, T value)
    {
        json_[key] = value;
    }
 
    void printObject() const;
protected:
    nlohmann::json json_{};
    filesystem::path path_;
};
}  // namespace volcart