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From "Karl Wettin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1306) CombinedNGramTokenFilter
Date Fri, 13 Jun 2008 07:26:45 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604756#action_12604756
] 

Karl Wettin commented on LUCENE-1306:
-------------------------------------

The current NGram analysis in trunk is split in two, on for edge-grams and one for inner grams.


This patch combines them both in a single filter that uses ^prefix and suffix$ tokens if they
are some sort of edge gram, or both around the complete token if n is great enough. There
is also method to extend if you want to add a payload (more boost to edge grams or something)
or do something to the gram tokens depending on what part of the original token they contain.

> CombinedNGramTokenFilter
> ------------------------
>
>                 Key: LUCENE-1306
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1306
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/analyzers
>            Reporter: Karl Wettin
>            Assignee: Karl Wettin
>            Priority: Trivial
>         Attachments: LUCENE-1306.txt
>
>
> Alternative NGram filter that produce tokens with composite prefix and suffix markers.
> {code:java}
> ts = new WhitespaceTokenizer(new StringReader("hello"));
> ts = new CombinedNGramTokenFilter(ts, 2, 2);
> assertNext(ts, "^h");
> assertNext(ts, "he");
> assertNext(ts, "el");
> assertNext(ts, "ll");
> assertNext(ts, "lo");
> assertNext(ts, "o$");
> assertNull(ts.next());
> {code}

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