[collections] - immutable (functional programming) maps/sets/lists in java

[Eric Goff <go...@gmail.com>]

I have a collection of implementations of efficient immutable maps/sets/lists
for java.

That is to say, they efficiently (in O(log n)) implement methods
for additon/removal/lookup/insert that return entirely new maps/sets/lists
while leaving the original unchanged.   In particular, I have an O(log n)
insertion of one list into another list.

Would the apache commons collections be a good place to donate this?
Has it already been done?

Thank you,
Eric Goff

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