static_resource_view.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "resource_view.hpp"
#include "required.hpp"
#include <span>
#include <cstddef>
#include <unordered_map>
 
namespace tt {
 
class static_resource_view : public resource_view {
public:
    static_resource_view(std::string const &filename);
 
    static_resource_view() = delete;
    ~static_resource_view() = default;
    static_resource_view(static_resource_view const &other) = default;
    static_resource_view &operator=(static_resource_view const &other) = default;
    static_resource_view(static_resource_view &&other) = default;
    static_resource_view &operator=(static_resource_view &&other) = default;
 
    [[nodiscard]] size_t offset() const noexcept override { return 0; }
 
    [[nodiscard]] size_t size() const noexcept override { return _bytes.size(); }
 
    [[nodiscard]] std::byte const *data() const noexcept override { return _bytes.data(); }
 
    [[nodiscard]] std::span<std::byte const> bytes() const noexcept override { return _bytes; }
 
    [[nodiscard]] std::string_view string_view() const noexcept override { return {reinterpret_cast<char const*>(data()), size()}; }
 
    [[nodiscard]] static std::unique_ptr<resource_view> loadView(std::string const &location) {
        return std::make_unique<static_resource_view>(location);
    }
 
    static std::span<std::byte const> get_static_resource(std::string const &key);
 
    static void add_static_resource(std::string const &key, std::span<std::byte const> value) noexcept;
 
private:
    static inline std::unordered_map<std::string, std::span<std::byte const>> _static_resources;
 
    // Borrowed reference from a byte array inside StaticResources.
    std::span<std::byte const> _bytes;
};
 
 
}