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From "Ken Krugler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (TIKA-339) HtmlParser & TXTParser should not use language returned by CharsetDetector if language hint has been provided
Date Tue, 01 Dec 2009 21:27:20 GMT

    [ https://issues.apache.org/jira/browse/TIKA-339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784442#action_12784442
] 

Ken Krugler commented on TIKA-339:
----------------------------------

There's another issue here. If you add the detected language as Metadata.LANGUAGE & Metadata.CONTENT_LANGUAGE,
and the HTML document contains (say) an Http-equiv meta tag, then you'll wind up with different
values for the two, with no way of knowing which one is better (the one that was explicitly
set by the meta tag).

So this makes me think we should punt completely on using the CharsetDetector language - if
the the user cares, then they can use the ProfilingHandler to get (hopefully) more accurate
results.

> HtmlParser & TXTParser should not use language returned by CharsetDetector if language
hint has been provided
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: TIKA-339
>                 URL: https://issues.apache.org/jira/browse/TIKA-339
>             Project: Tika
>          Issue Type: Bug
>    Affects Versions: 0.6
>            Reporter: Ken Krugler
>            Priority: Minor
>             Fix For: 0.6
>
>
> Currently the code used to call CharsetDetector in both TXTParser and HtmlParser is that
any incoming language in the metadata map gets replaced if the detector returns a language.
> Given the low reliability of this language result, it should only be used in cases where
there is no provided language, as typically this is coming in from either the Http response
header or (for the HtmlParser) a meta tag or some other tag attribute. In all those cases,
the incoming language is more accurate than the guess by the CharsetDetector.

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