[jira] Commented: (LUCENE-584) Decouple Filter from BitSet

["Peter Schäfer (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/LUCENE-584?page=comments#action_12414224 ] 

Peter Schäfer commented on LUCENE-584:
--------------------------------------

thanks, this looks interesting.

Regards,
Peter

> Decouple Filter from BitSet
> ---------------------------
>
>          Key: LUCENE-584
>          URL: http://issues.apache.org/jira/browse/LUCENE-584
>      Project: Lucene - Java
>         Type: Improvement

>   Components: Search
>     Versions: 2.0.1
>     Reporter: Peter Schäfer
>     Priority: Minor

>
> {code}
> package org.apache.lucene.search;
> public abstract class Filter implements java.io.Serializable 
> {
>   public abstract AbstractBitSet bits(IndexReader reader) throws IOException;
> }
> public interface AbstractBitSet 
> {
>   public boolean get(int index);
> }
> {code}
> It would be useful if the method =Filter.bits()= returned an abstract interface, instead of =java.util.BitSet=.
> Use case: there is a very large index, and, depending on the user's privileges, only a small portion of the index is actually visible.
> Sparsely populated =java.util.BitSet=s are not efficient and waste lots of memory. It would be desirable to have an alternative BitSet implementation with smaller memory footprint.
> Though it _is_ possibly to derive classes from =java.util.BitSet=, it was obviously not designed for that purpose.
> That's why I propose to use an interface instead. The default implementation could still delegate to =java.util.BitSet=.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira


---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org