@return bool True if the class with the supplied name can be resolved with 'get'.
	 */
	public function has( string $class_name ): bool {
		$class_name = trim( $class_name, '\\' );
		return $this->is_class_allowed( $class_name ) || isset( $this->resolved_cache[ $class_name ] );
	}

	/**
	 * Checks to see whether a class is allowed to be registered.
	 *
	 * @param string $class_name The class to check.
	 *
	 * @return bool True if the class is allowed to be registered, false otherwise.
	 */
	protected function is_class_allowed( string $class_name ): bool {
		return StringUtil::starts_with( $class_name, self::WOOCOMMERCE_NAMESPACE, false );
	}
}