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Implement a shortcut, when range has min>max. In this case a static empty SortedVIntList is returned. 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@738182 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uwe Schindler 2009-01-27 18:12:34 +00:00
parent 153acfd064
commit f1ab1aee64
1 changed files with 20 additions and 12 deletions
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32
contrib/queries/src/java/org/apache/lucene/search/trie/TrieRangeFilter.java
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@ -27,6 +27,7 @@ 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.
@ -257,19 +258,24 @@ public final class TrieRangeFilter extends Filter {
*/
//@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final OpenBitSet bits = new OpenBitSet(reader.maxDoc());
final TermDocs termDocs = reader.termDocs();
try {
lastNumberOfTerms=splitRange(
reader,termDocs,bits,
min,trieVariant.TRIE_CODED_NUMERIC_MIN.equals(min),
max,trieVariant.TRIE_CODED_NUMERIC_MAX.equals(max)
);
//System.out.println("Found "+lastNumberOfTerms+" distinct terms in filtered range for field '"+field+"'.");
} finally {
termDocs.close();
if (min.compareTo(max) > 0) {
// shortcut: if min>max, no docs will match!
lastNumberOfTerms=0;
return EMPTY_DOCIDSET;
} else {
final OpenBitSet bits = new OpenBitSet(reader.maxDoc());
final TermDocs termDocs = reader.termDocs();
try {
lastNumberOfTerms=splitRange(
reader,termDocs,bits,
min,trieVariant.TRIE_CODED_NUMERIC_MIN.equals(min),
max,trieVariant.TRIE_CODED_NUMERIC_MAX.equals(max)
);
} finally {
termDocs.close();
}
return bits;
}
return bits;
}
/**
@ -289,4 +295,6 @@ 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]);
}