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LUCENE-1507: add DocIdSet.EMPTY_DOCIDSET 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@738895 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless 2009-01-29 15:39:11 +00:00
parent 48c3220021
commit 20753f2e31
2 changed files with 11 additions and 7 deletions
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5
contrib/queries/src/java/org/apache/lucene/search/trie/TrieRangeFilter.java
View File

@ -27,7 +27,6 @@ import org.apache.lucene.index.TermDocs;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.index.Term;
import org.apache.lucene.util.OpenBitSet;
import org.apache.lucene.util.SortedVIntList;
/**
* Implementation of a Lucene {@link Filter} that implements trie-based range filtering.
@ -261,7 +260,7 @@ public final class TrieRangeFilter extends Filter {
if (min.compareTo(max) > 0) {
// shortcut: if min>max, no docs will match!
lastNumberOfTerms=0;
return EMPTY_DOCIDSET;
return DocIdSet.EMPTY_DOCIDSET;
} else {
final OpenBitSet bits = new OpenBitSet(reader.maxDoc());
final TermDocs termDocs = reader.termDocs();
@ -295,6 +294,4 @@ public final class TrieRangeFilter extends Filter {
private final boolean minInclusive,maxInclusive;
private Object minUnconverted,maxUnconverted;
private int lastNumberOfTerms=-1;
private static final DocIdSet EMPTY_DOCIDSET = new SortedVIntList(new int[0]);
}

13
src/java/org/apache/lucene/search/DocIdSet.java
View File

@ -18,11 +18,18 @@ package org.apache.lucene.search;
*/
import java.io.IOException;
import org.apache.lucene.util.SortedVIntList;
/**
* A DocIdSet contains a set of doc ids. Implementing classes must provide
* a {@link DocIdSetIterator} to access the set.
* A DocIdSet contains a set of doc ids. Implementing classes must
* only implement {@link #iterator} to provide access to the set.
*/
public abstract class DocIdSet {
public abstract DocIdSetIterator iterator() throws IOException;
/** An empty {@code DocIdSet} instance for easy use (this is currently
* implemented using a {@link SortedVIntList}). */
public static final DocIdSet EMPTY_DOCIDSET = new SortedVIntList(new int[0]);
/** Provides a {@link DocIdSetIterator} to access the set. */
public abstract DocIdSetIterator iterator() throws IOException;
}