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From "Chris (JIRA)" <>
Subject [jira] Commented: (LUCENE-671) Hashtable based Document
Date Fri, 15 Sep 2006 13:01:25 GMT
    [ ] 
Chris commented on LUCENE-671:

> It is to keep folks from thinking, if they subclass Document, that instances of their
subclass will be returned to them in search results. To make Documents fully-subclassible
one would need to make their serialization extensible.

Ahhh, that makes sense to me, and I think providing a method for informing the rest of lucene
which versions of various classes to use is probably more trouble than it's worth. We'll just
maintain our own tree then.


> Hashtable based Document
> ------------------------
>                 Key: LUCENE-671
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index, Search
>    Affects Versions: 2.0.0, 1.9
>            Reporter: Chris
>            Priority: Minor
>         Attachments:,
> 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
> 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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