org.apache.lucene.queries.intervals.ConjunctionIntervalIterator Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.queries.intervals;
import java.io.IOException;
import java.util.List;
import org.apache.lucene.search.ConjunctionUtils;
import org.apache.lucene.search.DocIdSetIterator;
abstract class ConjunctionIntervalIterator extends IntervalIterator {
final DocIdSetIterator approximation;
final List subIterators;
final float cost;
ConjunctionIntervalIterator(List subIterators) {
this.approximation = ConjunctionUtils.intersectIterators(subIterators);
this.subIterators = subIterators;
float costsum = 0;
for (IntervalIterator it : subIterators) {
costsum += it.matchCost();
}
this.cost = costsum;
}
@Override
public int docID() {
return approximation.docID();
}
@Override
public int nextDoc() throws IOException {
int doc = approximation.nextDoc();
if (doc != NO_MORE_DOCS) {
reset();
}
return doc;
}
@Override
public int advance(int target) throws IOException {
int doc = approximation.advance(target);
if (doc != NO_MORE_DOCS) {
reset();
}
return doc;
}
protected abstract void reset() throws IOException;
@Override
public long cost() {
return approximation.cost();
}
@Override
public final float matchCost() {
return cost;
}
}