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From René Treffer (JIRA) <>
Subject [jira] Created: (LUCENE-2799) MMapDirectory not designed for inheritance
Date Sat, 04 Dec 2010 22:15:11 GMT
MMapDirectory not designed for inheritance

                 Key: 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

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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