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From Henri Yandell <>
Subject Re: [lang][collections] Overlap; Collections thoughts
Date Sat, 02 Jan 2010 08:31:52 GMT
Briefly looking at
- it looks like this is more along the lines of the Collections as new
data structures/algorithms rather than Collections as JDK enhancer?

Ignoring the edge case overlaps with Math and Lang anyway.


On Wed, Dec 30, 2009 at 3:58 AM, Benson Margulies <> wrote:
> Henri,
> To make this more interesting, the new collections over in mahout-math
> might be covering some of the territory you are looking for here.
> --benson
> On Wed, Dec 30, 2009 at 5:18 AM, Henri Yandell <> wrote:
>> Overlap between Lang and Collections is starting to increase a bit.
>> Requested items for ArrayUtils (LANG-238, LANG-470) are better
>> implemented imo as an ArraySet class. An easy add to Collections.
>> ComparableComparator made its way (privately) over for the new Range
>> class. Fair enough - Comparable and Comparator also overlap between
>> lang.* and util.*.
>> I have a JIRA issue threat to consider moving Collections code over to
>> Lang if Collections becomes dead [LANG-532]  :)
>> ---
>> One thought I have for Collections is splitting it up into two parts.
>> The first would be items that add to collections in the JDK, the
>> second would be additional collections. The former could conceivably
>> merge with Lang, the latter could also be split up into an SPI style
>> approach with an API jar and an Impl jar. The latter would most likely
>> depend on the former.
>> It would then be tempting to also merge Functors for example into the
>> latter, plus I think we could get back on the bandwagon of adding new
>> things, like the long standing Trie JIRA issue.
>> Biased note: Part of this is that I'm interested in the JDK enhancing
>> parts, but not all the implementations of weird and whacky
>> collections; however I think this is likely not just me and that the
>> separation would do wonders for the release cycle.
>> Thoughts?
>> Hen
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