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#pragma once
#include <string>
#include <vector>
#include "openvic2/Logger.hpp"
namespace OpenVic2 {
using return_t = bool;
// This mirrors godot::Error, where `OK = 0` and `FAILED = 1`.
static constexpr return_t SUCCESS = false, FAILURE = true;
/*
* 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(std::string const& 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;
};
/*
* 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 {
const std::string name;
std::vector<T> items;
bool locked = false;
public:
IdentifierRegistry(std::string const& 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;
}
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() {
items.clear();
locked = false;
}
size_t get_item_count() const {
return items.size();
}
T* get_item_by_identifier(std::string const& identifier) {
if (!identifier.empty())
for (T& item : items)
if (item.get_identifier() == identifier) return &item;
return nullptr;
}
T const* get_item_by_identifier(std::string const& identifier) const {
if (!identifier.empty())
for (T const& item : items)
if (item.get_identifier() == identifier) return &item;
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;
}
};
}
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