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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.action.search;
import org.apache.lucene.search.Scorable;
import org.apache.lucene.search.ScoreMode;
import org.apache.lucene.search.SimpleCollector;
import java.io.IOException;
/**
* A collector that computes the maximum score.
*/
public class MaxScoreCollector extends SimpleCollector {
private Scorable scorer;
private float maxScore = Float.NEGATIVE_INFINITY;
private boolean hasHits = false;
@Override
public void setScorer(Scorable scorer) {
this.scorer = scorer;
}
@Override
public ScoreMode scoreMode() {
// Could be TOP_SCORES but it is always used in a MultiCollector anyway, so this saves some wrapping.
return ScoreMode.COMPLETE;
}
@Override
public void collect(int doc) throws IOException {
hasHits = true;
maxScore = Math.max(maxScore, scorer.score());
}
/**
* Get the maximum score. This returns {@link Float#NaN} if no hits were
* collected.
*/
public float getMaxScore() {
return hasHits ? maxScore : Float.NaN;
}
}