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https://issues.apache.org/jira/browse/LUCENE-2282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837455#action_12837455
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Shai Erera commented on LUCENE-2282:
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bq. What are the applications that we are trying to support by exposing this
API?
Any application that extends IW, or provide its own Directory implementation,
and wants to reference Lucene's file extensions properly (i.e. not by putting
its code under o.a.l.index or hardcoding ".del" as its deletions file) will
benefit from making it public.
The class already exists, and declares the right constants and methods. All I
want is to expose it as public. This information is not *hidden*, it's out
there. We're just making it easier for apps to reference it.
Like Mike mentioned on the java-dev thread
http://old.nabble.com/IndexFileNames-td27699103.html, he exposes it (or a
variant) on the flex branch as public, because classes outside the 'index'
package need to reference it. Indeed once Flex is out, that file will need to
change or extend to accommodate pluggable index formats / files, but that's not
the matter of this issue. This issue is just about exposing an already existing
class as public instead of package-private for convenience ...
> 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
>
> Attachments: LUCENE-2282.patch
>
>
> 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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