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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2400) ShingleFilter: don't output all-filler shingles/unigrams; also, convert from TermAttribute to CharTermAttribute
Date Sun, 18 Apr 2010 16:15:25 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858307#action_12858307
] 

Uwe Schindler commented on LUCENE-2400:
---------------------------------------

Alternatively you can directly pass it to StringBuilder, as CharTermAttribute implements CharSequence:
[http://java.sun.com/j2se/1.5.0/docs/api/java/lang/StringBuilder.html#append(java.lang.CharSequence)].
But copying the buffer as Robert suggested should be faster.

Both variant are faster than creating a new String.

> ShingleFilter: don't output all-filler shingles/unigrams; also, convert from TermAttribute
to CharTermAttribute
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2400
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2400
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/analyzers
>    Affects Versions: 3.0.1
>            Reporter: Steven Rowe
>            Priority: Minor
>         Attachments: LUCENE-2400.patch
>
>
> When the input token stream to ShingleFilter has position increments greater than one,
filler tokens are inserted for each position for which there is no token in the input token
stream.  As a result, unigrams (if configured) and shingles can be filler-only.  Filler-only
output tokens make no sense - these should be removed.
> Also, because TermAttribute has been deprecated in favor of CharTermAttribute, the patch
will also convert TermAttribute usages to CharTermAttribute in ShingleFilter.

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