In the analyzers case, I don't think its really door-shutting. if someone extends an Analyzer, its likely to just result in problems from the tokenStream/reusableTokenStream mess.

On Wed, Mar 3, 2010 at 11:10 AM, Grant Ingersoll <gsingers@apache.org> wrote:

On Mar 1, 2010, at 2:51 AM, Michael McCandless wrote:

> Yeah in the case of DirectoryReader/MultiReader, I'd like for them to
> be final, not for performance but for door-shutting (ie the same
> reason we make analyzers final).

Door shutting often is not a good thing, especially in a project like Lucene where many people extend in ways we can't dream of.
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Robert Muir
rcmuir@gmail.com