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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.search.result;
import com.yahoo.search.query.Sorting;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* A hit orderer which can be assigned to a HitGroup to keep that group's
* hit sorted in accordance with the sorting specification given when this is created.
*
* @author Steinar Knutsen
*/
public class HitSortOrderer extends HitOrderer {
private final Comparator<Hit> fieldComparator;
/** Create a sort order from a sorting */
public HitSortOrderer(Sorting sorting) {
fieldComparator =
new MetaHitsFirstComparator(
new HitGroupsLastComparator(
new FieldComparator(sorting)));
}
/**
* Create a sort order from a comparator.
* This will be appended to the standard comparators used by this.
*/
public HitSortOrderer(Comparator<Hit> comparator) {
fieldComparator = new MetaHitsFirstComparator(new HitGroupsLastComparator(comparator));
}
/**
* Orders the given list of hits according to the sorting given at construction
*
* Meta hits are sorted before concrete hits, but have no internal
* ordering. The sorting is stable.
*/
public void order(List<Hit> hits) {
Collections.sort(hits, fieldComparator);
}
public Comparator<Hit> getComparator() {
return fieldComparator;
}
}
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