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Posted to dev@lucene.apache.org by "Mark Miller (JIRA)" <ji...@apache.org> on 2009/08/21 03:28:15 UTC
[jira] Reopened: (LUCENE-584) Decouple Filter from BitSet
[ https://issues.apache.org/jira/browse/LUCENE-584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mark Miller reopened LUCENE-584:
--------------------------------
I think I have tracked down this issue as the one changing things most regarding Scorer documentation in org.apache.lucene.search.package.html.
I've started updating it, but it needs a tad more work I think - reopening this issue as a convenient marker for this work.
> Decouple Filter from BitSet
> ---------------------------
>
> Key: LUCENE-584
> URL: https://issues.apache.org/jira/browse/LUCENE-584
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.1
> Reporter: Peter Schäfer
> Assignee: Michael Busch
> Priority: Minor
> Fix For: 2.4
>
> Attachments: bench-diff.txt, bench-diff.txt, CHANGES.txt.patch, ContribQueries20080111.patch, lucene-584-take2.patch, lucene-584-take3-part1.patch, lucene-584-take3-part2.patch, lucene-584-take4-part1.patch, lucene-584-take4-part2.patch, lucene-584-take5-part1.patch, lucene-584-take5-part2.patch, lucene-584.patch, Matcher-20070905-2default.patch, Matcher-20070905-3core.patch, Matcher-20071122-1ground.patch, Some Matchers.zip, Test20080111.patch
>
>
> {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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