[jira] [Commented] (LUCENE-8273) Add a ConditionalTokenFilter

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-8273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16452428#comment-16452428 ] 

Robert Muir commented on LUCENE-8273:
-------------------------------------

{quote}
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.
{quote}

I don't understand the problem yet, but I will try to fight with it. You mean any filter that uses captureState?

> Add a ConditionalTokenFilter
> ----------------------------
>
>                 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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