Default value annotation?

[micopiira]

I was wondering if it would be possible to implement setting default value for a property using an annotation?

It would be a bit cleaner IMO. Something like:

@Value.Immutable
public interface Interface {
  @Value.Default("default")
  String someString();
}

vs

@Value.Immutable
public interface Interface {
  default String someString() {
    return "default";
  }
}

The annotation processor could probably check that the value passed to the annotation is the same type as the return type?

[asereda-gs]

I understand we're saving a couple of lines here but are there other benefits in having the expression not in the method body ?

BTW @Value.Default("foo" + 33) is also a valid annotation expression.

[micopiira]

@asereda-gs I can't think of any other benefits than saving a couple of lines. But one significant difference in behaviour is when using a default annotation, any manual implementations of the interface do not inherit the default value, which may be desired in some circumstances.