Re: [Springframework-developer] Comparator singletons MIA?

[Juergen H. <ju...@in...>]

NullSafeComparator has two such singletons: NULLS_LOW and NULLS_HIGH, =
each
using a ComparableComparator underneath. I guess you could simply use =
those
singletons rather than one on ComparableComparator itself.

Juergen
=20

-----Original Message-----
From: spr...@li...
[mailto:spr...@li...] On Behalf =
Of
Oliver Hutchison
Sent: Friday, July 22, 2005 4:22 AM
To: spr...@li...
Subject: RE: [Springframework-developer] Comparator singletons MIA?

Actually I see this is only the case for ComparableComparator (I've got =
to
many versions of the code open at the moment) the NullSafeComparator and
BooleanComparator singletons are still there.=20

My question still stands through.=20

Oliver

> -----Original Message-----
> From: spr...@li...
> [mailto:spr...@li...]
>  On Behalf Of Oliver Hutchison
> Sent: Friday, 22 July 2005 10:32 AM
> To: spr...@li...
> Subject: [Springframework-developer] Comparator singletons MIA?
>=20
> Jurgen,
>=20
> I've just started upgrading Spring Rich to the latest spring code base =

> and noticed that all of the Comparator singletons (which Spring Rich=20
> uses a lot) in the o.s.util.comparator package have been removed.
>=20
> These classes are IMHO perfect examples of where you should be using a =

> singleton. Given that every instance will exhibit exactly the same=20
> behaviour, why would you ever want to have more that one instance of a =

> class like ComparableComparator?
> Also how much cleaner is this:
>=20
> ComparableComparator.nullSafeInstance().compare(argument1, argument2)
>=20
> to this?
>=20
> new NullSafeComparator(new ComparableComparator(),=20
> true).compare(argument1, argument2)
>=20
> and more performant to boot.
>=20
> Anyway, obviously I can live without them, but I'm curious about the=20
> rational behind the removal?
>=20
> Thanks,
>=20
> Oliver
>=20
>=20
>=20
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