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https://issues.apache.org/jira/browse/LUCENE-7366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356983#comment-15356983
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Robert Muir commented on LUCENE-7366:
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I don't agree with that. That costs a readAttribute for every file.
> Allow RAMDirectory to copy any Directory
> -----------------------------------------
>
> Key: LUCENE-7366
> URL: https://issues.apache.org/jira/browse/LUCENE-7366
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Rob Audenaerde
>
> Uwe: "The FSDirectory passed to RAMDirectory in the ctor could be changed to
> Directory easily. The additional check for "not is a directory inode" is in
> my opinion lo longer needed, because listFiles should only return files."
> Use case: For increasing the speed of some of my application tests, I want to
> re-use/copy a pre-populated RAMDirectory over and over.
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