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https://issues.apache.org/jira/browse/LUCENE-400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steven Rowe updated LUCENE-400:
-------------------------------
Attachment: LUCENE-400.patch
Repackaged these four files as a patch, with the following modifications to the
code:
* Renamed files and variables to refer to "n-grams" as "shingles", to avoid
confusion with the character-level n-gram code already in Lucene's sandbox
* Placed code in the o.a.l.analysis.shingle package
* Converted commons-collections FIFO usages to LinkedLists
* Removed @author from javadocs
* Changed deprecated Lucene API usages to alternate forms; addressed all
compilation warnings
* Changed code style to conform to Lucene conventions
* Changed field setters to return null instead of a reference to the class
instance, then changed instantiations to use individual setter calls instead of
the chained calling style
* Added ASF license to each file
All tests pass.
Although I left in the ShingleAnalyzerWrapper and its test in the patch, no
other Lucene filter (AFAICT) has such a filter wrapping facility. My vote is
to remove these two files.
> 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
> Priority: Minor
> 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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