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From Jan Høydahl (JIRA) <j...@apache.org>
Subject [jira] Updated: (SOLR-1979) Create LanguageIdentifierUpdateProcessor
Date Fri, 03 Dec 2010 23:38:13 GMT

     [ https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jan Høydahl updated SOLR-1979:
------------------------------

    Description: 
We need the ability to detect language of some random text in order to act upon it, such as
indexing the content into language aware fields. Another usecase is to be able to filter/facet
on language on random unstructured content.

To do this, we wrap the Tika LanguageIdentifier in an UpdateProcessor. The processor is configurable
like this:

{code:xml} 
  <processor class="org.apache.solr.update.processor.LanguageIdentifierUpdateProcessorFactory">
    <str name="inputFields">name,subject</str>
    <str name="outputField">language_s</str>
    <str name="idField">id</str>
    <str name="fallback">en</str>
  </processor>
{code} 

It will then read the text from inputFields name and subject, perform language identification
and output the ISO code for the detected language in the outputField. If no language was detected,
fallback language is used.

  was:
We need the ability to detect language of some random text in order to act upon it, such as
indexing the content into language aware fields. Another usecase is to be able to filter/facet
on language on random unstructured content.

To do this, we should wrap the [Nutch LanguageIdentifier|http://nutch.apache.org/apidocs-1.1/org/apache/nutch/analysis/lang/LanguageIdentifier.html"]
in an UpdateProcessor. The processor should be configured like this:

{code:xml} 
  <processor class="org.apache.solr.update.processor.LanguageIdentifierUpdateProcessorFactory">
    <str name="inputFields">title,teaser,body</str>
    <str name="isoOutputField">language</str>
    <str name="fullOutputField">language_display</str>
  </processor>  
{code} 


> Create LanguageIdentifierUpdateProcessor
> ----------------------------------------
>
>                 Key: SOLR-1979
>                 URL: https://issues.apache.org/jira/browse/SOLR-1979
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Jan Høydahl
>            Priority: Minor
>         Attachments: SOLR-1979.patch
>
>
> We need the ability to detect language of some random text in order to act upon it, such
as indexing the content into language aware fields. Another usecase is to be able to filter/facet
on language on random unstructured content.
> To do this, we wrap the Tika LanguageIdentifier in an UpdateProcessor. The processor
is configurable like this:
> {code:xml} 
>   <processor class="org.apache.solr.update.processor.LanguageIdentifierUpdateProcessorFactory">
>     <str name="inputFields">name,subject</str>
>     <str name="outputField">language_s</str>
>     <str name="idField">id</str>
>     <str name="fallback">en</str>
>   </processor>
> {code} 
> It will then read the text from inputFields name and subject, perform language identification
and output the ISO code for the detected language in the outputField. If no language was detected,
fallback language is used.

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