| /* |
| * 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.solr.search; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.search.Collector; |
| import org.apache.lucene.search.Scorable; |
| import org.apache.lucene.search.ScoreMode; |
| import org.apache.lucene.search.SimpleCollector; |
| |
| /** A {@link Collector} for the maximum score value. */ |
| public class MaxScoreCollector extends SimpleCollector { |
| private Scorable scorer; |
| private float maxScore = Float.MIN_VALUE; |
| private boolean collectedAnyHits = false; |
| |
| public MaxScoreCollector() {} |
| |
| public float getMaxScore() { |
| return collectedAnyHits ? maxScore : Float.NaN; |
| } |
| |
| @Override |
| public ScoreMode scoreMode() { |
| return ScoreMode.TOP_SCORES; |
| } |
| |
| @Override |
| public void setScorer(Scorable scorer) throws IOException { |
| if (maxScore == Float.MIN_VALUE) { |
| scorer.setMinCompetitiveScore(0f); |
| } else { |
| scorer.setMinCompetitiveScore(Math.nextUp(maxScore)); |
| } |
| this.scorer = scorer; |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| collectedAnyHits = true; |
| float docScore = scorer.score(); |
| if (Float.compare(docScore, maxScore) > 0) { |
| maxScore = docScore; |
| scorer.setMinCompetitiveScore(Math.nextUp(maxScore)); |
| } |
| } |
| } |