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