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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.common.lucene.search.function;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.Explanation;
import java.io.IOException;
import java.util.Objects;
public class WeightFactorFunction extends ScoreFunction {
private static final ScoreFunction SCORE_ONE = new ScoreOne(CombineFunction.MULTIPLY);
private final ScoreFunction scoreFunction;
private float weight = 1.0f;
public WeightFactorFunction(float weight, ScoreFunction scoreFunction) {
super(CombineFunction.MULTIPLY);
if (scoreFunction == null) {
this.scoreFunction = SCORE_ONE;
} else {
this.scoreFunction = scoreFunction;
}
this.weight = weight;
}
public WeightFactorFunction(float weight) {
super(CombineFunction.MULTIPLY);
this.scoreFunction = SCORE_ONE;
this.weight = weight;
}
@Override
public LeafScoreFunction getLeafScoreFunction(LeafReaderContext ctx) throws IOException {
final LeafScoreFunction leafFunction = scoreFunction.getLeafScoreFunction(ctx);
return new LeafScoreFunction() {
@Override
public double score(int docId, float subQueryScore) throws IOException {
return leafFunction.score(docId, subQueryScore) * getWeight();
}
@Override
public Explanation explainScore(int docId, Explanation subQueryScore) throws IOException {
Explanation functionExplanation = leafFunction.explainScore(docId, subQueryScore);
return Explanation.match(
functionExplanation.getValue().floatValue() * getWeight(),
"product of:",
functionExplanation,
explainWeight()
);
}
};
}
@Override
public boolean needsScores() {
return scoreFunction.needsScores();
}
public Explanation explainWeight() {
return Explanation.match(getWeight(), "weight");
}
@Override
public float getWeight() {
return weight;
}
public ScoreFunction getScoreFunction() {
return scoreFunction;
}
@Override
protected boolean doEquals(ScoreFunction other) {
WeightFactorFunction weightFactorFunction = (WeightFactorFunction) other;
return this.weight == weightFactorFunction.weight && Objects.equals(this.scoreFunction, weightFactorFunction.scoreFunction);
}
@Override
protected int doHashCode() {
return Objects.hash(weight, scoreFunction);
}
private static class ScoreOne extends ScoreFunction {
protected ScoreOne(CombineFunction scoreCombiner) {
super(scoreCombiner);
}
@Override
public LeafScoreFunction getLeafScoreFunction(LeafReaderContext ctx) {
return new LeafScoreFunction() {
@Override
public double score(int docId, float subQueryScore) {
return 1.0;
}
@Override
public Explanation explainScore(int docId, Explanation subQueryScore) {
return Explanation.match(1.0f, "constant score 1.0 - no function provided");
}
};
}
@Override
public boolean needsScores() {
return false;
}
@Override
protected boolean doEquals(ScoreFunction other) {
return true;
}
@Override
protected int doHashCode() {
return 0;
}
}
}