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/*
* 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.common.lucene.search.function;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Weight;
import java.io.IOException;
abstract class CustomBoostFactorScorer extends Scorer {
final float subQueryBoost;
final Scorer scorer;
final float maxBoost;
final CombineFunction scoreCombiner;
Float minScore;
NextDoc nextDoc;
CustomBoostFactorScorer(Weight w, Scorer scorer, float maxBoost, CombineFunction scoreCombiner, Float minScore)
throws IOException {
super(w);
if (minScore == null) {
nextDoc = new AnyNextDoc();
} else {
nextDoc = new MinScoreNextDoc();
}
this.subQueryBoost = w.getQuery().getBoost();
this.scorer = scorer;
this.maxBoost = maxBoost;
this.scoreCombiner = scoreCombiner;
this.minScore = minScore;
}
@Override
public int docID() {
return scorer.docID();
}
@Override
public int advance(int target) throws IOException {
return nextDoc.advance(target);
}
@Override
public int nextDoc() throws IOException {
return nextDoc.nextDoc();
}
public abstract float innerScore() throws IOException;
@Override
public float score() throws IOException {
return nextDoc.score();
}
@Override
public int freq() throws IOException {
return scorer.freq();
}
@Override
public long cost() {
return scorer.cost();
}
public interface NextDoc {
public int advance(int target) throws IOException;
public int nextDoc() throws IOException;
public float score() throws IOException;
}
public class MinScoreNextDoc implements NextDoc {
float currentScore = Float.MAX_VALUE * -1.0f;
public int nextDoc() throws IOException {
int doc;
do {
doc = scorer.nextDoc();
if (doc == NO_MORE_DOCS) {
return doc;
}
currentScore = innerScore();
} while (currentScore < minScore);
return doc;
}
@Override
public float score() throws IOException {
return currentScore;
}
public int advance(int target) throws IOException {
int doc = scorer.advance(target);
if (doc == NO_MORE_DOCS) {
return doc;
}
currentScore = innerScore();
if (currentScore < minScore) {
return scorer.nextDoc();
}
return doc;
}
}
public class AnyNextDoc implements NextDoc {
public int nextDoc() throws IOException {
return scorer.nextDoc();
}
@Override
public float score() throws IOException {
return innerScore();
}
public int advance(int target) throws IOException {
return scorer.advance(target);
}
}
}