1 files changed, 142 insertions, 0 deletions
diff --git a/src/openvic/types/IdentifierRegistry.hpp b/src/openvic/types/IdentifierRegistry.hpp
new file mode 100644
index 0000000..e5ac94b
--- /dev/null
+++ b/src/openvic/types/IdentifierRegistry.hpp
@@ -0,0 +1,142 @@
+#pragma once
+
+#include <map>
+#include <unordered_map>
+#include <vector>
+
+#include "openvic/types/Colour.hpp"
+#include "openvic/types/Return.hpp"
+#include "openvic/utility/Logger.hpp"
+
+namespace OpenVic {
+	/*
+	 * Base class for objects with a non-empty string identifier,
+	 * uniquely named instances of which can be entered into an
+	 * IdentifierRegistry instance.
+	 */
+	class HasIdentifier {
+		const std::string identifier;
+
+	protected:
+		HasIdentifier(const std::string_view new_identifier);
+
+	public:
+		HasIdentifier(HasIdentifier const&) = delete;
+		HasIdentifier(HasIdentifier&&) = default;
+		HasIdentifier& operator=(HasIdentifier const&) = delete;
+		HasIdentifier& operator=(HasIdentifier&&) = delete;
+
+		std::string const& get_identifier() const;
+	};
+
+	/*
+	 * Base class for objects with associated colour information.
+	 */
+	class HasColour {
+		const colour_t colour;
+
+	protected:
+		HasColour(const colour_t new_colour, bool can_be_null);
+
+	public:
+		HasColour(HasColour const&) = delete;
+		HasColour(HasColour&&) = default;
+		HasColour& operator=(HasColour const&) = delete;
+		HasColour& operator=(HasColour&&) = delete;
+
+		colour_t get_colour() const;
+		std::string colour_to_hex_string() const;
+		static std::string colour_to_hex_string(colour_t const colour);
+	};
+
+	/*
+	 * Base class for objects with a unique string identifier
+	 * and associated colour information.
+	 */
+	class HasIdentifierAndColour : public HasIdentifier, public HasColour {
+	protected:
+		HasIdentifierAndColour(const std::string_view new_identifier, const colour_t new_colour, bool can_be_null);
+
+	public:
+		HasIdentifierAndColour(HasIdentifierAndColour const&) = delete;
+		HasIdentifierAndColour(HasIdentifierAndColour&&) = default;
+		HasIdentifierAndColour& operator=(HasIdentifierAndColour const&) = delete;
+		HasIdentifierAndColour& operator=(HasIdentifierAndColour&&) = delete;
+	};
+
+	using distribution_t = std::unordered_map<HasIdentifierAndColour const*, float>;
+
+	/*
+	 * Template for a list of objects with unique string identifiers that can
+	 * be locked to prevent any further additions. The template argument T is
+	 * the type of object that the registry will store, and the second part ensures
+	 * that HasIdentifier is a base class of T.
+	 */
+	template<class T, typename std::enable_if<std::is_base_of<HasIdentifier, T>::value>::type* = nullptr>
+	class IdentifierRegistry {
+		using identifier_index_map_t = std::map<std::string, size_t, std::less<void>>;
+
+		const std::string name;
+		std::vector<T> items;
+		bool locked = false;
+		identifier_index_map_t identifier_index_map;
+
+	public:
+		IdentifierRegistry(const std::string_view new_name) : name { new_name } {}
+		return_t add_item(T&& item) {
+			if (locked) {
+				Logger::error("Cannot add item to the ", name, " registry - locked!");
+				return FAILURE;
+			}
+			T const* old_item = get_item_by_identifier(item.get_identifier());
+			if (old_item != nullptr) {
+				Logger::error("Cannot add item to the ", name, " registry - an item with the identifier \"", item.get_identifier(), "\" already exists!");
+				return FAILURE;
+			}
+			identifier_index_map[item.get_identifier()] = items.size();
+			items.push_back(std::move(item));
+			return SUCCESS;
+		}
+		void lock(bool log = true) {
+			if (locked) {
+				Logger::error("Failed to lock ", name, " registry - already locked!");
+			} else {
+				locked = true;
+				if (log) Logger::info("Locked ", name, " registry after registering ", get_item_count(), " items");
+			}
+		}
+		bool is_locked() const {
+			return locked;
+		}
+		void reset() {
+			identifier_index_map.clear();
+			items.clear();
+			locked = false;
+		}
+		size_t get_item_count() const {
+			return items.size();
+		}
+		T* get_item_by_identifier(const std::string_view identifier) {
+			const identifier_index_map_t::const_iterator it = identifier_index_map.find(identifier);
+			if (it != identifier_index_map.end()) return &items[it->second];
+			return nullptr;
+		}
+		T const* get_item_by_identifier(const std::string_view identifier) const {
+			const identifier_index_map_t::const_iterator it = identifier_index_map.find(identifier);
+			if (it != identifier_index_map.end()) return &items[it->second];
+			return nullptr;
+		}
+		T* get_item_by_index(size_t index) {
+			return index < items.size() ? &items[index] : nullptr;
+		}
+		T const* get_item_by_index(size_t index) const {
+			return index < items.size() ? &items[index] : nullptr;
+		}
+		std::vector<T>& get_items() {
+			return items;
+		}
+		std::vector<T> const& get_items() const {
+			return items;
+		}
+	};
+}