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From Paul King <>
Subject Re: Making @Immutable a meta-annotation
Date Fri, 12 Jan 2018 07:01:50 GMT
@ImmutableCore is similar to @ImmutableBase - probably okay but I don't
think ideal. Another alternative would be @ImmutableInfo or have an
explicit marker interface with a different package, e.g.
groovy.transform.marker.Immutable but that might cause IDE completion
headaches. Perhaps @KnownImmutable as a straight marker interface might be
the way to go - then it could be used explicitly on manually created
immutable classes and avoid the need to use the
knownImmutableClasses/knownImmutables annotation attributes for that case.

Cheers, Paul.

On Thu, Jan 11, 2018 at 9:34 PM, mg <> wrote:

> Hi Paul,
> great to make @Immutable more fine granular / flexible :-)
> what about
> @ImmutabilityChecked
> or
> @ImmutableCore
> instead of @ImmutableClass ?
> Cheers
> mg
> -------- Urspr√ľngliche Nachricht --------
> Von: Paul King <>
> Datum: 11.01.18 08:07 (GMT+01:00)
> An:
> Betreff: Making @Immutable a meta-annotation
> There has been discussion on and off about making @Immutable a
> meta-annotation (annotation collector) in much the same way as @Canonical
> was re-vamped. (This is for 2.5+).
> I have a preliminary PR which does this:
> Preliminary because it still needs a bit of refactoring to reduce some
> duplication of code that exists between the normal and immutable map and
> tuple constructors. I still need to do this but that can happen
> transparently behind the scenes as an implementation detail if we don't
> finish it straight away. As well as reducing duplication, the pending
> refactoring will enable things like the pre and post options for
> MapConstructor and TupleConstructor which aren't currently working.
> I am keen on any feedback at this point. In particular, while most of the
> functionality is pushed off into the collected annotations/transforms, I
> ended up with some left over checks which I kept in an annotation currently
> called @ImmutableClass. I tried various names for this class, e.g.
> @ImmutableBase and @ImmutableCheck but finally settled on @ImmutableClass
> since the annotation causes the preliminary checks to be performed but also
> acts as a marker interface for the MapConstructor and TupleConstructor
> transforms to do the alternate code needed for immutability and to indicate
> that a class is immutable when it might itself be a property of another
> immutable class. Let me know if you can think of a better name or have any
> other feedback.
> Cheers, Paul.

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