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From Luc Maisonobe <Luc.Maison...@free.fr>
Subject [codec][collections][math]Re: [lang] adding an implementation of the Myers difference algorithm
Date Sat, 07 Apr 2012 09:41:21 GMT
Hi Gary,

Le 07/04/2012 04:30, Gary Gregory a écrit :
> On Apr 6, 2012, at 16:05, Luc Maisonobe <Luc.Maisonobe@free.fr> wrote:
> 
>> Hi Gary,
>>
>> Le 06/04/2012 21:50, Gary Gregory a écrit :
>>> On Fri, Apr 6, 2012 at 11:14 AM, luc <luc@spaceroots.org> wrote:
>>>
>>>> Hello,
>>>>
>>>> Some times ago, Thomas proposed an implementation of a Longest Commons
>>>> Substring algorithm. At
>>>> that time I said I had another algorithm in the same spirit for the Myers
>>>> difference algorithm.
>>>>
>>>> I got the green light to provide this code base to the Apache Software
>>>> Foundation. I will send
>>>> the Software Grant to secretary in a few minutes. Once the grant is
>>>> registered, I will create a
>>>> Jira issue and attach the original code to it, then I will port it for
>>>> inclusion into Commons.
>>>>
>>>> The public API of this implementation takes two sequences of Object and
>>>> provides as output an EditScript
>>>> which implements the visitor design pattern. By visiting the script, we
>>>> can retrieve the differences
>>>> between the two sequences (objects inserted, object deleted) or we can
>>>> retrieve the similarities
>>>> (sub-sequences that are in both initial sequences). We only use the
>>>> "equals" method in the initial objects.
>>>>
>>>> So my questions are:
>>>>
>>>> - in which component do we include this, we talked about [lang], is it
>>>> right ?
>>>> - the classes are in a "comparator" package, where should we put this
>>>> package ?
>>>>
>>>
>>> .text?
>>
>> Perhaps, but it is much more general than that. It can be used on any
>> object as it only relies on equal. You could use it on text, on numbers,
>> on genetic sequences, on binary streams, you name it.
> 
> Not to be downer here but this is feeling out of scope for Lang. I

You are right.

> think about the java.lang extension mission and this does not fit IMO.
> So the next question is where in Commons would this fit? Codec? A new
> component? There are 20 plus components in Commons, let's think of the
> best fit.

Looking at the list, I would put [collections] as first choice and
[codec] as second choice ... and [math] as third choice (but this is
already stretching too far).

Any other idea or advice ?

Luc

> 
> Gary
> 
>>
>> Luc
>>
>>>
>>> Gary
>>>
>>>>
>>>> best regards,
>>>> Luc
>>>>
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>>>>
>>>>
>>>
>>>
>>
>>
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