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From "Stephen Colebourne" <>
Subject Re: [collections] MultiHashIdentityMap ?
Date Thu, 17 Feb 2005 23:29:50 GMT
There has been demand before for MultiHashMap to extend 

I support the concept of MultiMaps produced by decoration, however we cannot 
change the existing MultiHashMap class.

Should you, or anyone else, implement a MultiMap based on 
AbstractMapDecorator, with test cases, attached to a bugzilla call, then I 
would like to add it to [collections].


----- Original Message ----- 
From: "paul womack" <>
>I *really* like the MultiMap concept; I have many
> uses for it within my app.
> However, I have quite a lot of well defined
> "pools" of objects.
> These are often used as keys to java.util.Maps; since
> I *KNOW* I'm OK, I use java.util.IdentityMaps
> for performance reasons.
> I would very much like to have the same option with MultiHashMap.
> MultiHashMap is already carefully designed to allow
> the underlying "multi-ness" to be implmented by the
> Collection of my choice, by over-riding createCollection();
> However, MultiHashMap extends HashMap, which means my request
> is no trivial to implement.
> If (I suggest :-) it extended AbstractMapDecorator, the underlying
> Map could be similarly versatile.
>     BugBear
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