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https://issues.apache.org/jira/browse/LUCENE-2799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966864#action_12966864
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Uwe Schindler edited comment on LUCENE-2799 at 12/4/10 5:22 PM:
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To change the openInput logic to map special files to other directories use
e.g. FileSwitchDirectory or similar implementations with the delegation
pattern. There is no need to extend MMapDirectory.
was (Author: thetaphi):
To change the openIngs logic to map special files to other directories use
e.g. FileSwitchDirectory or similar implementations sign the delegate pattern.
There is no need to extend MMapDirectory.
> MMapDirectory not designed for inheritance
> ------------------------------------------
>
> Key: LUCENE-2799
> URL: https://issues.apache.org/jira/browse/LUCENE-2799
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Affects Versions: 3.0.3
> Reporter: René Treffer
>
> How to reproduce
> Try to inherit from MMapDirectory to change the openInput logic (open files
> from different directories).
> Expected result:
> Inherit from MMapDirectory, overwrite the one method, done.
> Actual result:
> It's impossible to overwrite the method as the inner classes would be
> missing. It's impossible to fork the inner classes as they depend on a final
> method with default visibility (cleanMapping).
> It turns out to be the easiest option to completely for the code and replace
> just the method in question.
> Possible fix:
> Change the visibility of most members and subtypes to be at least protected
> and avoid the default visibility.
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