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From "David Mason (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3979) NGramTokenizer strips whitespace, with no option to keep leading and trailing whitespace
Date Fri, 13 Apr 2012 04:47:28 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Mason updated LUCENE-3979:
--------------------------------

    Summary: NGramTokenizer strips whitespace, with no option to keep leading and trailing
whitespace  (was: NGramTokenizer)
    
> NGramTokenizer strips whitespace, with no option to keep leading and trailing whitespace
> ----------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3979
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3979
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: modules/analysis
>    Affects Versions: 2.9.2, 3.0
>         Environment: n/a
>            Reporter: David Mason
>            Priority: Minor
>              Labels: tokenizer, whitespace
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> org.apache.lucene.analysis.ngram.NGramTokenizer removes whitespace, making a search for
literal strings like " test" and "test " equivalent to "test". Searching with relevant whitespace
is sometimes desired, particularly where ngrams are used.
> This could be fixed by either removing .trim() from the line shown below, or by providing
a flag to specifically set trimming behaviour (keeping trim=true as the default so that existing
code using this analyzer is not broken).
> 111: inStr = new String(chars).trim();  // remove any trailing empty strings 

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