private function getClassMapByFullyQualifiedClassName(FullyQualifiedClassName $fqsen) : ClassMap { if (empty($this->class_fqsen_class_map_map[$fqsen])) { $this->class_fqsen_class_map_map[$fqsen] = new ClassMap(); } return $this->class_fqsen_class_map_map[$fqsen]; }