Instantiator\Instantiator::getReflectionClass PHP Method

    private function getReflectionClass($className)
    {
        if (!class_exists($className)) {
            throw InvalidArgumentException::fromNonExistingClass($className);
        }
        $reflection = new ReflectionClass($className);
        if ($reflection->isAbstract()) {
            throw InvalidArgumentException::fromAbstractClass($reflection);
        }
        return $reflection;
    }