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From Tomás Fernández Löbbe (JIRA) <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7181) JapaneseTokenizer: Validate segmentation of User Dictionary entries on creation
Date Fri, 08 Apr 2016 18:38:25 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232686#comment-15232686
] 

Tomás Fernández Löbbe commented on LUCENE-7181:
-----------------------------------------------

[~cm], any thoughts on the patch?

> JapaneseTokenizer: Validate segmentation of User Dictionary entries on creation
> -------------------------------------------------------------------------------
>
>                 Key: LUCENE-7181
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7181
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Tomás Fernández Löbbe
>         Attachments: LUCENE-7181.patch
>
>
> From the [conversation on the dev list|http://mail-archives.apache.org/mod_mbox/lucene-dev/201604.mbox/%3CCAMJgJxR8gLnXi7WXkN3KFfxHu=PoSeVxXARbbg+cHCE1TZhhpQ@mail.gmail.com%3E]
> The user dictionary in the {{JapaneseTokenizer}} allows users to customize how a stream
is broken into tokens using a specific set of rules provided like: 
> AABBBCC -> AA BBB CC
> It does not allow users to change any of the token characters like:
> (1) AABBBCC -> DD BBB CC   (this will just tokenize to "AA", "BBB", "CC", seems to
only care about positions) 
> It also doesn't let a character be part of more than one token, like:
> (2) AABBBCC -> AAB BBB BCC (this will throw an AIOOBE)
> ..or make the output token bigger than the input text: 
> (3) AA -> AAA (Also AIOOBE)
> Currently there is no validation for those cases, case 1 doesn't fail but provide unexpected
tokens. Cases 2 and 3 fail when the input text is analyzed. We should add validation to the
{{UserDictionary}} creation.



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