| /* |
| * 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.search; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| /** |
| * The Indri implemenation of a disjunction scorer which stores the subscorers for the child |
| * queries. The score and smoothingScore methods use the list of all subscorers and not just the |
| * matches so that a smoothingScore can be calculated if there is not an exact match. |
| */ |
| public abstract class IndriDisjunctionScorer extends IndriScorer { |
| |
| private final List<Scorer> subScorersList; |
| private final DisiPriorityQueue subScorers; |
| private final DocIdSetIterator approximation; |
| |
| protected IndriDisjunctionScorer( |
| Weight weight, List<Scorer> subScorersList, ScoreMode scoreMode, float boost) { |
| super(weight, boost); |
| this.subScorersList = subScorersList; |
| this.subScorers = new DisiPriorityQueue(subScorersList.size()); |
| for (Scorer scorer : subScorersList) { |
| final DisiWrapper w = new DisiWrapper(scorer); |
| this.subScorers.add(w); |
| } |
| this.approximation = new DisjunctionDISIApproximation(this.subScorers); |
| } |
| |
| @Override |
| public DocIdSetIterator iterator() { |
| return approximation; |
| } |
| |
| @Override |
| public float getMaxScore(int upTo) throws IOException { |
| return 0; |
| } |
| |
| public List<Scorer> getSubMatches() throws IOException { |
| return subScorersList; |
| } |
| |
| abstract float score(List<Scorer> subScorers) throws IOException; |
| |
| public abstract float smoothingScore(List<Scorer> subScorers, int docId) throws IOException; |
| |
| @Override |
| public float score() throws IOException { |
| return score(getSubMatches()); |
| } |
| |
| @Override |
| public float smoothingScore(int docId) throws IOException { |
| return smoothingScore(getSubMatches(), docId); |
| } |
| |
| @Override |
| public int docID() { |
| return subScorers.top().doc; |
| } |
| } |