[collections] Functors: why in commons.collections and not commons.lang?

[Keith Bennett <kr...@yahoo.com>]

I understand that Functor interfaces (Factory, Predicate, Closure,
Transformer) are used by classes in the collections library, and need
to be accessible by that library.

However, I believe these interfaces are universally useful in cases
having nothing to do with collections.

It's too bad they're not in java.lang.  I wonder if they could have
been
placed in commons.lang instead of commons.collections.  I guess that
would have required that commons.lang *always* be present when
commons.collections was used, and that is undesirable.  Is this how
the decison was made to include them in commons.collections?

- Keith Bennett



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