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From Peter Schäfer (JIRA) <>
Subject [jira] Created: (LUCENE-584) Decouple Filter from BitSet
Date Wed, 31 May 2006 11:48:29 GMT
Decouple Filter from BitSet

         Key: LUCENE-584
     Project: Lucene - Java
        Type: Improvement

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


public abstract class Filter implements 
  public abstract AbstractBitSet bits(IndexReader reader) throws IOException;

public interface AbstractBitSet 
  public boolean get(int index);


It would be useful if the method =Filter.bits()= returned an abstract interface, instead of

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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