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https://issues.apache.org/jira/browse/LUCENE-8273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16452274#comment-16452274
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Alan Woodward commented on LUCENE-8273:
---------------------------------------

Here's an updated patch:
* now works with wrapped filters that emit more than one token (thanks David!)
* renamed to ConditionalTokenFilter and the logic reversed (thanks Robert!)
* cleaned up all the logic around reset(), close() and end()
* integrated into testRandomChains.

This latter one is a bit clunky, as this TokenFilter won't work with filters 
that consume more than one token at a time - eg ShingleFilter or 
SynonymGraphFilter.  At the moment I have a blacklist, but there may be a 
better way of isolating that - preferably one that throws errors when you build 
the TokenStream.  Speak up if you have any suggestions.

I do like the idea of integrating things into CustomAnalyzer, will look at that 
next.

> Add a BypassingTokenFilter
> --------------------------
>
>                 Key: LUCENE-8273
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8273
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Alan Woodward
>            Priority: Major
>         Attachments: LUCENE-8273.patch, LUCENE-8273.patch
>
>
> Spinoff of LUCENE-8265.  It would be useful to be able to wrap a TokenFilter 
> in such a way that it could optionally be bypassed based on the current state 
> of the TokenStream.  This could be used to, for example, only apply 
> WordDelimiterFilter to terms that contain hyphens.



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