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https://issues.apache.org/jira/browse/COLLECTIONS-404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe updated COLLECTIONS-404:
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Attachment: commons-collections-difference.patch
The commons-collections-difference.patch is a patch against current trunk. It
is a simple port of the comparator.zip contribution with the following changes:
- changed package name to org.apache.commons.collections.list.difference
- added Apache header
- changed @version to $Id$
- added @since 4.0
As I have never committed to [collections] before, I would like to have someone
review this.
I am not sure the package choice is good. The top level class
(SequenceComparator) takes two Object arrays rather than two lists for now.
This should probably be changes to two List<Object> if the package remains here.
> 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.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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