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Posted to dev@lucene.apache.org by "Otis Gospodnetic (JIRA)" <ji...@apache.org> on 2006/07/09 16:52:30 UTC
[jira] Commented: (LUCENE-400) NGramFilter -- construct n-grams
from a TokenStream
[ http://issues.apache.org/jira/browse/LUCENE-400?page=comments#action_12419913 ]
Otis Gospodnetic commented on LUCENE-400:
-----------------------------------------
Sebastian, ever figured out the problem? Also, is there a way to get rid of the Commons Collections? Lucene has no run-time dependencies on other libraries.
> NGramFilter -- construct n-grams from a TokenStream
> ---------------------------------------------------
>
> Key: LUCENE-400
> URL: http://issues.apache.org/jira/browse/LUCENE-400
> Project: Lucene - Java
> Type: Improvement
> Components: Analysis
> Versions: unspecified
> Environment: Operating System: All
> Platform: All
> Reporter: Sebastian Kirsch
> Assignee: Lucene Developers
> Priority: Minor
> Attachments: NGramAnalyzerWrapper.java, NGramAnalyzerWrapperTest.java, NGramFilter.java, NGramFilterTest.java
>
> This filter constructs n-grams (token combinations up to a fixed size, sometimes
> called "shingles") from a token stream.
> The filter sets start offsets, end offsets and position increments, so
> highlighting and phrase queries should work.
> Position increments > 1 in the input stream are replaced by filler tokens
> (tokens with termText "_" and endOffset - startOffset = 0) in the output
> n-grams. (Position increments > 1 in the input stream are usually caused by
> removing some tokens, eg. stopwords, from a stream.)
> The filter uses CircularFifoBuffer and UnboundedFifoBuffer from Apache
> Commons-Collections.
> Filter, test case and an analyzer are attached.
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