/** @public */
export class RevRegistry<T> {
    private readonly items = new Map<string, T>();

    get all() { return Array.from(this.items.values()); }

    /**
     * Register an item and return it.
     * @remarks Adds an item to the registry using the provided name (or the class name), converted to all lower case.
     * @param name - Case-insensitive item key. If not given, fallsback to `item.prototype.$$CLASS_NAME` or `item.prototype.name` or `item.name`.
     * @param item - If unregistered or omitted, nothing is added and method returns `undefined`.
     *
     * @returns Newly registered item or `undefined` if unregistered.
     */
    register(name: string, item: T) {
        this.items.set(name, item);
        return item;
    }

    get(name: string): T | undefined {
        if (!name) {
            return undefined;
        } else {
            const result = this.items.get(name); // for performance reasons, do not convert to lower case
            return result;
        }
    }
}