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https://issues.apache.org/jira/browse/LUCENE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-6958:
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    Attachment: LUCENE-6958.patch

Patch.

> Improve CustomAnalyzer to also allow to specify factory directly (for 
> compile-time safety)
> ------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-6958
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6958
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/analysis
>    Affects Versions: 5.4
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 5.5
>
>         Attachments: LUCENE-6958.patch
>
>
> Currently CustomAnalyzer only allows to specify the SPI names of factories. 
> As the fluent builder pattern is mostly used inside Java code, it is better 
> for type safety to optionally also specify the factory class directly (using 
> compile-time safe patterns like 
> {{.withTokenizer(WhitespaceTokenizerFactory.class)}}). With the string names, 
> you get the error only at runtime. Of course this does not help with wrong, 
> spelled parameter names, but it also has the side effect that you can click 
> on the class name in your code to get javadocs with the parameter names.
> This issue will add this functionality and update the docs/example.
> Thanks to [~shaie] for suggesting this!



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