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https://issues.apache.org/jira/browse/LUCENE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karl Wettin updated LUCENE-1306:
--------------------------------
Attachment: LUCENE-1306.txt
New in this patch:
* offsets as in NGramTokenFilter
* token type "^gram", "gram$", "^gram$" and "gram"
* a bit of javadocs
There is also a todo I'll have to look in to some other day.
{code:java}
// todo
// /**
// * if true, prefix and suffix does not count as a part of the ngram size.
// * E.g. '^he' has as n of 2 if true and 3 if false
// */
// private boolean usingBoundaryCharsPartOfN = true;
{code}
This was not quite as simple to add as I hoped it would be and will try to find
some time to fix that before I commit it.
> 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, 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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