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package hu.bme.mit.inf.dslreasoner.viatrasolver.reasoner.optimization
import java.util.Comparator
import org.eclipse.viatra.dse.base.ThreadContext
import org.eclipse.viatra.dse.objectives.IObjective
import org.eclipse.xtend.lib.annotations.Accessors
import org.eclipse.xtend.lib.annotations.Data
import org.eclipse.xtend.lib.annotations.FinalFieldsConstructor
abstract class ObjectiveThreshold {
public static val NO_THRESHOLD = new ObjectiveThreshold {
override isHard() {
false
}
override satisfiesThreshold(double cost, Comparator<Double> comparator) {
true
}
override protected postProcessSatisfactoryCost(double cost, ObjectiveKind kind) {
cost
}
override ObjectiveThreshold merge(ObjectiveThreshold other) {
if (other == NO_THRESHOLD) {
NO_THRESHOLD
} else {
throw new IllegalArgumentException("Merged thresholds must have the same type")
}
}
}
private new() {
}
def boolean isHard() {
true
}
def boolean satisfiesThreshold(double cost, ObjectiveKind kind) {
satisfiesThreshold(cost, kind.comparator)
}
def boolean satisfiesThreshold(double cost, Comparator<Double> comparator)
def double postProcessCost(double cost, ObjectiveKind kind) {
if (satisfiesThreshold(cost, kind)) {
postProcessSatisfactoryCost(cost, kind)
} else {
cost
}
}
protected def double postProcessSatisfactoryCost(double cost, ObjectiveKind kind)
def ObjectiveThreshold merge(ObjectiveThreshold other)
@Data
static class Exclusive extends ObjectiveThreshold {
static val EPSILON = 0.1
val double threshold
val boolean clampToThreshold
@FinalFieldsConstructor
new() {
}
new(double threshold) {
this(threshold, true)
}
override satisfiesThreshold(double cost, Comparator<Double> comparator) {
comparator.compare(threshold, cost) < 0
}
override protected postProcessSatisfactoryCost(double cost, ObjectiveKind kind) {
if (clampToThreshold) {
threshold + Math.signum(kind.satisfiedValue) * EPSILON
} else {
cost
}
}
override ObjectiveThreshold merge(ObjectiveThreshold other) {
if (other instanceof Exclusive) {
new Exclusive(threshold + other.threshold)
} else {
throw new IllegalArgumentException("Merged thresholds must have the same type")
}
}
}
@Data
static class Inclusive extends ObjectiveThreshold {
val double threshold
val boolean clampToThreshold
@FinalFieldsConstructor
new() {
}
new(double threshold) {
this(threshold, true)
}
override satisfiesThreshold(double cost, Comparator<Double> comparator) {
comparator.compare(threshold, cost) <= 0
}
override protected postProcessSatisfactoryCost(double cost, ObjectiveKind kind) {
if (clampToThreshold) {
threshold
} else {
cost
}
}
override ObjectiveThreshold merge(ObjectiveThreshold other) {
if (other instanceof Inclusive) {
new Inclusive(threshold + other.threshold)
} else {
throw new IllegalArgumentException("Merged thresholds must have the same type")
}
}
}
}
abstract class DirectionalThresholdObjective implements IObjective {
@Accessors val String name
@Accessors ObjectiveKind kind
@Accessors ObjectiveThreshold threshold
@Accessors int level
protected new(String name, ObjectiveKind kind, ObjectiveThreshold threshold, int level) {
this.name = name
this.kind = kind
this.threshold = threshold
this.level = level
}
override isHardObjective() {
threshold.hard
}
override satisifiesHardObjective(Double fitness) {
threshold.satisfiesThreshold(fitness, comparator)
}
override getComparator() {
kind.comparator
}
override setComparator(Comparator<Double> comparator) {
kind = ObjectiveKind.fromComparator(comparator)
}
override getFitness(ThreadContext context) {
val fitness = getRawFitness(context)
threshold.postProcessCost(fitness, kind)
}
protected def double getRawFitness(ThreadContext context)
}
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