| /* |
| * 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.DocIdSetIterator; |
| |
| abstract class ConjunctionIntervalIterator extends IntervalIterator { |
| |
| final DocIdSetIterator approximation; |
| final List<IntervalIterator> subIterators; |
| final float cost; |
| |
| ConjunctionIntervalIterator(List<IntervalIterator> subIterators) { |
| this.approximation = ConjunctionDISI.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(); |
| reset(); |
| return doc; |
| } |
| |
| @Override |
| public int advance(int target) throws IOException { |
| int doc = approximation.advance(target); |
| reset(); |
| return doc; |
| } |
| |
| protected abstract void reset() throws IOException; |
| |
| @Override |
| public long cost() { |
| return approximation.cost(); |
| } |
| |
| @Override |
| public final float matchCost() { |
| return cost; |
| } |
| |
| } |