private void validateStatePreCreate(User user) {
if (this.user == null) throw new IllegalStateException("resources id not initialized!");
if (!this.user.isEmpty()) throw new IllegalStateException("user already exists!");
if (!userId.equals(user.identity()))
throw new IllegalArgumentException("wrong data passed - user#identity did not match!");
}
@Override
@Modify
public void create(User user, Result<String> result) throws AppException {
validateStatePreCreate(user);
getValidator()
.validate(
user,
result.from(
u -> {
this.user = u;
return user.identity().getKey();
}));
}