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https://issues.apache.org/jira/browse/LUCENE-4947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637945#comment-13637945
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Kevin Lawson commented on LUCENE-4947:
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Ah. It slipped my mind that the result of combining GPL and Apache licensed
code must be GPL.
I'm fully committed providing it to the Lucene project under the Apache License
(version 2) if possible, or if it comes down to it, changing the license
entirely.
If the former is possible, consider this post one that formally licenses both
LevenshteinAutomaton and MDAG, to the Lucene development team under Apache
License (version 2), irregardless of any licenses that may be included with
either project, and any license notices contained in any of their constituent
files.
If the former is not possible, I suppose I could push up versions of each
project licensed appropriately to the general public.
Just tell me what action(s) need to be taken from here.
> Java implementation (and improvement) of Levenshtein & associated lexicon
> automata
> ----------------------------------------------------------------------------------
>
> Key: LUCENE-4947
> URL: https://issues.apache.org/jira/browse/LUCENE-4947
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 4.0-ALPHA, 4.0-BETA, 4.0, 4.1, 4.2, 4.2.1
> Reporter: Kevin Lawson
>
> I was encouraged by Mike McCandless to open an issue concerning this after I
> contacted him privately about it. Thanks Mike!
> I'd like to submit my Java implementation of the Levenshtein Automaton as a
> homogenous replacement for the current heterogenous, multi-component
> implementation in Lucene.
> Benefits of upgrading include
> - Reduced code complexity
> - Better performance from components that were previously implemented in
> Python
> - Support for on-the-fly dictionary-automaton manipulation (if you wish to
> use my dictionary-automaton implementation)
> The code for all the components is well structured, easy to follow, and
> extensively commented. It has also been fully tested for correct
> functionality and performance.
> The levenshtein automaton implementation (along with the required MDAG
> reference) can be found in my LevenshteinAutomaton Java library here:
> https://github.com/klawson88/LevenshteinAutomaton.
> The minimalistic directed acyclic graph (MDAG) which the automaton code uses
> to store and step through word sets can be found here:
> https://github.com/klawson88/MDAG
> *Transpositions aren't currently implemented. I hope the comment filled,
> editing-friendly code combined with the fact that the section in the Mihov
> paper detailing transpositions is only 2 pages makes adding the functionality
> trivial.
> *As a result of support for on-the-fly manipulation, the MDAG
> (dictionary-automaton) creation process incurs a slight speed penalty. In
> order to have the best of both worlds, i'd recommend the addition of a
> constructor which only takes sorted input. The complete, easy to follow
> pseudo-code for the simple procedure can be found in the first article I
> linked under the references section in the MDAG repository)
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