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package hu.bme.mit.inf.dslreasoner.viatrasolver.reasoner.optimization;
import java.util.Comparator;
import org.eclipse.viatra.dse.objectives.Comparators;
public enum ObjectiveKind {
LOWER_IS_BETTER {
@Override
public Comparator<Double> getComparator() {
return Comparators.LOWER_IS_BETTER;
}
@Override
public double getInvalidValue() {
return Double.POSITIVE_INFINITY;
}
@Override
public double getSatisfiedValue() {
return Double.NEGATIVE_INFINITY;
}
},
HIGHER_IS_BETTER {
@Override
public Comparator<Double> getComparator() {
return Comparators.HIGHER_IS_BETTER;
}
@Override
public double getInvalidValue() {
return Double.NEGATIVE_INFINITY;
}
@Override
public double getSatisfiedValue() {
return Double.POSITIVE_INFINITY;
}
};
public abstract Comparator<Double> getComparator();
public abstract double getInvalidValue();
public abstract double getSatisfiedValue();
public static ObjectiveKind fromComparator(Comparator<Double> comparator) {
if (Comparators.LOWER_IS_BETTER.equals(comparator)) {
return ObjectiveKind.LOWER_IS_BETTER;
} else if (Comparators.HIGHER_IS_BETTER.equals(comparator)) {
return ObjectiveKind.HIGHER_IS_BETTER;
} else {
throw new IllegalStateException("Only LOWER_IS_BETTER and HIGHER_IS_BETTER comparators are supported.");
}
}
}
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