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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-2906) Filter to process output of ICUTokenizer and create overlapping bigrams for CJK
Date Thu, 29 Dec 2011 10:27:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177101#comment-13177101
] 

Uwe Schindler commented on LUCENE-2906:
---------------------------------------

...alternatively, we could use a HashSet<String>. If the stringsin it are intered, the
lookup is fast, too. The hashCode of Strings is precalculated in the String class. For four
if checks it maybe not really different performance wise, but thats just another idea. The
ctor would simply check the flags and add the type strings to the Set<String>.
                
> Filter to process output of ICUTokenizer and create overlapping bigrams for CJK 
> --------------------------------------------------------------------------------
>
>                 Key: LUCENE-2906
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2906
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: modules/analysis
>            Reporter: Tom Burton-West
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.6, 4.0
>
>         Attachments: LUCENE-2906.patch, LUCENE-2906.patch, LUCENE-2906.patch, LUCENE-2906.patch
>
>
> The ICUTokenizer produces unigrams for CJK. We would like to use the ICUTokenizer but
have overlapping bigrams created for CJK as in the CJK Analyzer.  This filter would take the
output of the ICUtokenizer, read the ScriptAttribute and for selected scripts (Han, Kana),
would produce overlapping bigrams.

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