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/*******************************************************************************
* Copyright (c) 2010-2015, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi and Daniel Varro
* Copyright (c) 2023 The Refinery Authors <https://refinery.tools/>
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.store.dse.objectives;
import java.util.List;
/**
* This class is responsible to compare and sort fitness values.
*
* @author András Szabolcs Nagy
*/
public class ObjectiveComparatorHelper {
private final List<Objective> objectives;
public ObjectiveComparatorHelper(List<Objective> objectives) {
this.objectives = objectives;
}
/**
* Compares two fitnesses based on dominance. Returns -1 if the second parameter {@code o2} is a better
* solution ({@code o2} dominates {@code o1}), 1 if the first parameter {@code o1} is better ({@code o1} dominates
* {@code o2}) and returns 0 if they are non-dominating each other.
*/
public int compare(Fitness o1, Fitness o2) {
boolean o1HasBetterFitness = false;
boolean o2HasBetterFitness = false;
for (Objective objective : objectives) {
String objectiveName = objective.getName();
int sgn = objective.getComparator().compare(o1.get(objectiveName), o2.get(objectiveName));
if (sgn < 0) {
o2HasBetterFitness = true;
}
if (sgn > 0) {
o1HasBetterFitness = true;
}
if (o1HasBetterFitness && o2HasBetterFitness) {
break;
}
}
if (o2HasBetterFitness) {
return -1;
} else if (o1HasBetterFitness) {
return 1;
}
return 0;
}
}
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