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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: 2.9/3.0 plan & Java 1.5
Date Sun, 14 Dec 2008 14:18:24 GMT
> >> 2. Generics' utility is not limited to collections, we use it for
> >> type-safe index fields storage/querying for example.
> >> Define field:
> >> FieldInfo<EmployerCategory> EMPLOYER_CATEGORY =
> >> field(ENUM(EmployerCategory.class), INDEX);
> >> Store it:
> >> add(vacancy.getEmployerCategory(), EMPLOYER_CATEGORY);
> >> Query it:
> >> return FilterTerm(EMPLOYER_CATEGORY, complementOf(EnumSet.of(AGENCY)));
> >>
> >> any field access is type-checked at compile time and happily
> >> autocompletes in IDE
> >
> > You are right, too, but this change needs modifications in the Lucene
> API. I
> > think this is a later step.
> I'm simply suggesting it, like for 2010 :)
> Vigorously preserving back-compatibility really takes the momentum out
> of Lucene development effort, in my opinion. I'd be much happier to
> rewrite half of my code each major release than limp along with some
> ugly stuff just for the sake of someone dropping in a new lucene jar
> into their mess and exclaiming - "Wow! It still works!"

:-)

> > Another step to Java 1.5 would be the use of Enum instead of Parameter,
> but
> > this cannot be done easily without breaking backwards compatibility. A
> first
> > approach would be to subclass "Parameter" to be instanceof "Enum". This
> can
> > be done by deprecating the old methods, that map to Enum methods (but I
> > think there are none). In short: replace the Parameter class by
> "Parameter
> > extends Enum". In Lucene 4.0, the Parameter class disappears and we have
> > nice clean enumeration types, which are also syntactical sugar :)
> You can't extend Enum in any way other from writing "public enum
> Parameter .. blah-blah" without resorting to really dirty tricks.

I meant it this way, but you are right, to keep backwards compatibility, you
have to do some dirty tricks :)

Uwe


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