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https://issues.apache.org/jira/browse/LUCENE-584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Busch updated LUCENE-584:
---------------------------------
Attachment: lucene-584-take4-part2.patch
lucene-584-take4-part1.patch
{quote}
BitSetFilter would inherit from Filter, and have an abstract bits() method, not
deprecated.
{quote}
OK I added a BitSetFilter. The rest of the patch is identical to take3.
I thought that I copied all your javadoc changes that still applied (after the
removal of Matcher, MatchFilter, etc.) over into this patch. But well, if you
think I missed any important ones let me know or feel free to update the patch!
> 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: 2.0.1
> Reporter: Peter Schäfer
> Assignee: Michael Busch
> Priority: Minor
> Fix For: 2.4
>
> Attachments: bench-diff.txt, bench-diff.txt, 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.patch,
> Matcher-20070905-2default.patch, Matcher-20070905-3core.patch,
> Matcher-20071122-1ground.patch, Some Matchers.zip
>
>
> {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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