Created: (LUCENE-671) Hashtable based Document

Hashtable based Document
------------------------

                 Key: LUCENE-671
                 URL: http:
//issues.apache.org/jira/browse/LUCENE-671
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index, Search
    Affects Versions: 2.0.0, 1.9
            Reporter: Chris
            Priority: Minor


I've attached a Document based on a hashtable and a
performance test case. It performs better in most cases (all
but enumeration by my measurement), but likely uses a larger
memory footprint. The Document testcase will fail since it
accesses the "fields" variable directly and gets
confused when it's not the list it expected it to be. 

If nothing else we would be interested in at least being
able to extend Document, which is currently declared final.
(Anyone know the performance gains on declaring a class
final?) Currently we have to maintain a copy of lucene which
has methods and classes definalized and overriden. 

There are other classes as well that could be declared
non-final (Fieldable comes to mind) since it's possible to
make changes for project specific situations in those aswell
but that's off-topic.

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