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