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=.
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