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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-404) Adding an implementation of Eugene Myers difference algorithm
Date Sat, 14 Jul 2012 21:48:35 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414516#comment-13414516
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Thomas Neidhart commented on COLLECTIONS-404:
---------------------------------------------

Hi Luc,

what do you think of moving this contribution to the comparators.sequence package? 
I think this would be a better fit than list.difference.

Thomas

p.s. I could do it myself together with other cleanups if you agree.
                
> Adding an implementation of Eugene Myers difference algorithm
> -------------------------------------------------------------
>
>                 Key: COLLECTIONS-404
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-404
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Collection
>    Affects Versions: 3.2.1
>         Environment: all
>            Reporter: Luc Maisonobe
>            Assignee: Luc Maisonobe
>            Priority: Minor
>         Attachments: commons-collections-difference-v2.patch, commons-collections-difference.patch,
comparator.zip
>
>
> 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
are).

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