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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2644) LowerCaseTokenizer Does Not Behave As One Might Expect (or Desire)--Given Its Name
Date Tue, 19 Oct 2010 00:40:26 GMT


Robert Muir commented on LUCENE-2644:

I don't understand this issue, to me the LowerCaseTokenizer explains clearly what it does:

 * LowerCaseTokenizer performs the function of LetterTokenizer
 * and LowerCaseFilter together.  It divides text at non-letters and converts
 * them to lower case.

I think there is a lot of other options if you want to customize tokenization by numbers,
punctuation etc, especially Solr's WordDelimiterFilter.

> LowerCaseTokenizer Does Not Behave As One Might Expect (or Desire)--Given Its Name
> ----------------------------------------------------------------------------------
>                 Key: LUCENE-2644
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 3.0.2
>            Reporter: Scott Gonyea
>             Fix For: 4.0
>         Attachments: LowerCaseTokenizer.patch
> While I understand some of the reasons for its design, the original LowerCaseTokenizer
should have been named LowerCaseLetterTokenizer.
> I feel that LowerCaseTokenizer makes too many assumptions about what too tokenize, and
I have therefore patched it.  The *default* behavior will remain as it always has--to avoid
breaking any implementations for which it's being used.
> I have changed LowerCaseTokenizer to extend CharTokenizer (rather than LetterTokenizer).
 LetterTokenizer's functionality was merged into the default behavior of LowerCaseTokenizer.
> Getter/Setter methods have been added to the LowerCaseTokenizer Class, allowing you to
turn on / off tokenizing by white space, numbers, and special (Non-Alpha/Numeric) characters.

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