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https://issues.apache.org/jira/browse/COLLECTIONS-404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644027#comment-13644027
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Thomas Neidhart commented on COLLECTIONS-404:
---------------------------------------------
After some thinking, I would like to do the following changes:
* move to o.a.c.collections4.sequence package (it does not implement
Comparator, so it is not really a good fit for comparators.sequence imho)
* hide the xxxCommand implementations as they are not visible to the user via
the API
* support command coalescing, e.g. subsequent keep commands could be merged to
a single one
* add a SequenceUtil class that provides certain helpers for common things
like getting the longest common subsequence of two lists
* hide Snake inside the SequencesComparator, as it is an implementation detail
* add a CharSequenceWrapper that wraps a CharSequence as List
* provide util methods for diff and edit script formatter (very easy to do
with the visitor pattern, I did already implement these)
> 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
> Priority: Minor
> Fix For: 4.0
>
> Attachments: commons-collections-difference.patch,
> commons-collections-difference-v2.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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