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https://issues.apache.org/jira/browse/LUCENE-400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12574493#action_12574493
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Grant Ingersoll commented on LUCENE-400:
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ping, Otis, do you still plan to commit?
> NGramFilter -- construct n-grams from a TokenStream
> ---------------------------------------------------
>
> Key: LUCENE-400
> URL: https://issues.apache.org/jira/browse/LUCENE-400
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Affects Versions: unspecified
> Environment: Operating System: All
> Platform: All
> Reporter: Sebastian Kirsch
> Assignee: Otis Gospodnetic
> Priority: Minor
> Fix For: 2.4
>
> Attachments: LUCENE-400.patch, 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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