- final Optional<Enumeration> known = Enumeration.forName(defaultValue);
- checkArgument(known.isPresent(), "Unknown ethertype %s", defaultValue);
- return verifyNotNull(ENUM_ETHERTYPES.get(known.get()));
+ final var known = Enumeration.forName(defaultValue);
+ checkArgument(known != null, "Unknown ethertype %s", defaultValue);
+ return verifyNotNull(ENUM_ETHERTYPES.get(known));