I think the IndexReader and IndexWriter should be interfaces, and change the codebase to use the interface where possible.
I agree that IndexReader should be an interface.
I'm less convinced about IndexWriter. I have a little harder time imagining alternate, pluggable implementations of IndexWriter. Perhaps one would want to write something which uses a different algorithm for merging indexes? So then the interface would be addDocument(), addIndexes(), optimize(), close(), get/setSimilarity and getAnalyzer(), with the rest of the methods, especially all the new accessors (getMergeFactor(), getMaxBufferedDocs, etc.) as implementation-specific? Is that what you have in mind?
Doug
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