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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.fastsearch;
import com.yahoo.search.query.Sorting;
import com.yahoo.search.result.Hit;
import com.yahoo.search.result.HitGroup;
import java.util.Comparator;
import java.util.List;
public class SortDataHitSorter {
public static void sort(HitGroup hitGroup, List<Hit> hits) {
var sorting = hitGroup.getQuery().getRanking().getSorting();
var fallbackOrderer = hitGroup.getOrderer();
if (sorting == null || fallbackOrderer == null) {
return;
}
var fallbackComparator = fallbackOrderer.getComparator();
hits.sort(getComparator(sorting, fallbackComparator));
}
public static boolean isSortable(Hit hit, Sorting sorting) {
if (sorting == null) {
return false;
}
if (hit instanceof FastHit fhit) {
return fhit.hasSortData(sorting);
} else {
return false;
}
}
public static Comparator<Hit> getComparator(Sorting sorting, Comparator<Hit> fallback) {
if (fallback == null) {
return (left, right) -> compareTwo(left, right, sorting);
} else {
return (left, right) -> compareWithFallback(left, right, sorting, fallback);
}
}
private static int compareTwo(Hit left, Hit right, Sorting sorting) {
if (!(left instanceof FastHit fl) || !(right instanceof FastHit fr)) return 0;
return FastHit.compareSortData(fl, fr, sorting);
}
private static int compareWithFallback(Hit left, Hit right, Sorting sorting, Comparator<Hit> fallback) {
if (!(left instanceof FastHit fl) || !(right instanceof FastHit fr)) {
return fallback.compare(left, right);
}
if (fl.hasSortData(sorting) && fr.hasSortData(sorting)) {
return FastHit.compareSortData(fl, fr, sorting);
} else {
return fallback.compare(left, right);
}
}
}
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