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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.ranking;
import com.yahoo.search.result.FeatureData;
import com.yahoo.search.result.Hit;
import static com.yahoo.searchlib.rankingexpression.Reference.RANKING_EXPRESSION_WRAPPER;
import java.util.function.Supplier;
import java.util.logging.Logger;
class HitRescorer {
private static final Logger logger = Logger.getLogger(HitRescorer.class.getName());
private final Supplier<Evaluator> evaluatorSource;
public HitRescorer(Supplier<Evaluator> evaluatorSource) {
this.evaluatorSource = evaluatorSource;
}
boolean rescoreHit(Hit hit) {
var features = hit.getField("matchfeatures");
if (features instanceof FeatureData matchFeatures) {
var scorer = evaluatorSource.get();
for (String argName : scorer.needInputs()) {
var asTensor = matchFeatures.getTensor(argName);
if (asTensor == null) {
asTensor = matchFeatures.getTensor(alternate(argName));
}
if (asTensor != null) {
scorer.bind(argName, asTensor);
} else {
logger.warning("Missing match-feature for Evaluator argument: " + argName);
return false;
}
}
double newScore = scorer.evaluateScore();
hit.setRelevance(newScore);
return true;
} else {
logger.warning("Hit without match-features: " + hit);
return false;
}
}
private static final String RE_PREFIX = RANKING_EXPRESSION_WRAPPER + "(";
private static final String RE_SUFFIX = ")";
private static final int RE_PRE_LEN = RE_PREFIX.length();
private static final int RE_SUF_LEN = RE_SUFFIX.length();
static String alternate(String argName) {
if (argName.startsWith(RE_PREFIX) && argName.endsWith(RE_SUFFIX)) {
return argName.substring(RE_PRE_LEN, argName.length() - RE_SUF_LEN);
}
return argName;
}
}
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