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https://issues.apache.org/jira/browse/LUCENE-8564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691605#comment-16691605
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Alan Woodward commented on LUCENE-8564:
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I reworked this slightly; we now have GraphTokenFilter as an abstract extension
of TokenFilter, rather than using a separate standalone object. This makes
reset()/end() easier to handle.
> Make it easier to iterate over graphs in tokenstreams
> -----------------------------------------------------
>
> Key: LUCENE-8564
> URL: https://issues.apache.org/jira/browse/LUCENE-8564
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Attachments: LUCENE-8564.patch, LUCENE-8564.patch
>
>
> We have a number of TokenFilters that read ahead in the token stream (eg
> synonyms, shingles) and ideally these would understand token graphs as well
> as linear streams. FixedShingleFilter already has some mechanisms to deal
> with graphs; this issue is to extract this logic into a GraphTokenStream
> class that can then be reused by other token filters
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