MMapDirectory not designed for inheritance
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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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