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https://issues.apache.org/jira/browse/LUCENE-2282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837446#action_12837446
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Marvin Humphrey commented on LUCENE-2282:
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It seems to me that identifying only core index files conflicts with the idea
of pluggable index formats. Presumably plugins would use their own file
extensions. Would these belong to the index, according to a detector based
off of IndexFileNames? Presumably not, which would either limit the
usefulness of such a utility, or outright encourage anti-patterns such as a
sweeper that zaps files created by plugins because they aren't "core Lucene"
enough.
Also, are temporary files "core Lucene"? Lockfiles? Only sometimes?
What are the applications that we are trying to support by exposing this API?
> Expose IndexFileNames as public, and make use of its methods in the code
> ------------------------------------------------------------------------
>
> Key: LUCENE-2282
> URL: https://issues.apache.org/jira/browse/LUCENE-2282
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Shai Erera
> Fix For: 3.1
>
>
> IndexFileNames is useful for applications that extend Lucene, an in
> particular those who extend Directory or IndexWriter. It provides useful
> constants and methods to query whether a certain file is a core Lucene file
> or not. In addition, IndexFileNames should be used by Lucene's code to
> generate segment file names, or query whether a certain file matches a
> certain extension.
> I'll post the patch shortly.
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