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Posted to dev@lucene.apache.org by "Paul Elschot (JIRA)" <ji...@apache.org> on 2006/11/17 13:27:39 UTC
[jira] Commented: (LUCENE-584) Decouple Filter from BitSet
[ http://issues.apache.org/jira/browse/LUCENE-584?page=comments#action_12450715 ]
Paul Elschot commented on LUCENE-584:
-------------------------------------
I have just resolved some minor local conflicts on the updated copyrights of four java files.
Please holler when a fresh patch is needed.
> Decouple Filter from BitSet
> ---------------------------
>
> Key: LUCENE-584
> URL: http://issues.apache.org/jira/browse/LUCENE-584
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.0.1
> Reporter: Peter Schäfer
> Priority: Minor
> Attachments: BitsMatcher.java, Filter-20060628.patch, HitCollector-20060628.patch, IndexSearcher-20060628.patch, MatchCollector.java, Matcher.java, Matcher20060830b.patch, Scorer-20060628.patch, Searchable-20060628.patch, Searcher-20060628.patch, Some Matchers.zip, SortedVIntList.java, TestSortedVIntList.java
>
>
> {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=.
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