How do I do something if an Optional<String> is not present or present but an empty string?

Question

I can't seem to figure out a more concise way to do this

Optional<String> foo;
if (!foo.isPresent() || StringUtils.isBlank(foo.get())) {
  // ...
}

There's this but it actually makes the logic more convoluted, IMO:

Optional<String> foo;
if (!foo.filter(StringUtils::isNotBlank).isPresent()) {
  // ...
}

Feel like I'm missing something really obvious.

Answer 1

Maybe this is what you're looking for.

Optional.of("")
        .filter(not(String::isBlank)))
        .orElseThrow(() -> new MyException("..."));

You'll find not under Predicate.

Obviosuly this is less efficient than having an if statement, but it has its place.

Ah, ok, after your comment it is more clear. Use orElseThrow.