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From "Thomas Neidhart (JIRA)" <>
Subject [jira] [Resolved] (COLLECTIONS-404) Adding an implementation of Eugene Myers difference algorithm
Date Sun, 05 May 2013 16:18:15 GMT


Thomas Neidhart resolved COLLECTIONS-404.

    Resolution: Fixed

I think we should close it now as it is. It is a great addition, and when collections 4 is
done, I would love to work on a commons-diffutils component to add more stuff which is probably
out-of-scope for collections.
> Adding an implementation of Eugene Myers difference algorithm
> -------------------------------------------------------------
>                 Key: COLLECTIONS-404
>                 URL:
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Collection
>    Affects Versions: 3.2.1
>         Environment: all
>            Reporter: Luc Maisonobe
>            Priority: Minor
>             Fix For: 4.0
>         Attachments: commons-collections-difference.patch, commons-collections-difference-v2.patch,,
> The difference algorithm aims at comparing two sequences of objects and return an "edit
script" which represents how one can transform the first sequence into the second sequence.
The script describes the various insert object, delete object and keep object commands. The
script is guaranteed to be the shortest possible in terms of number of commands.
> From the script, one can either extract longest common sub-sequences (i.e. how similar
the sequences are) or on the contrary the needed changes (i.e. how different the sequences

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