Yeah, I noticed the same thing. I was thinking of suggesting the use of Google Collections, too: http://code.google.com/p/google-collections/

They provide a host of Immutable collections and many other handy classes. Specifically, I thought BiMap could replace BidirectionalMap (I've been working on implementing this, actually). The Google Collections are very well tested (and widely deployed), vetted by Josh Bloch, and may potentially make it into the JDK in time.

Great interview with the creators here: http://www.javalobby.org/articles/google-collections/

-jeff

On Fri, Sep 4, 2009 at 11:30 PM, Krzysztof Sobolewski <Krzysztof.Sobolewski@atm.com.pl> wrote:
I noticed that there was a problem with generics in Immutables class. May I
suggest a better approach? (patch attached) :)

[AFAICS the same thing is needed for analogous code in JBoss Cache, BTW]
-KS

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