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package hu.bme.mit.inf.dslreasoner.viatrasolver.reasoner.dse
import hu.bme.mit.inf.dslreasoner.viatrasolver.reasoner.optimization.IThreeValuedObjective
import org.eclipse.viatra.dse.base.ThreadContext
import org.eclipse.viatra.dse.objectives.Comparators
import org.eclipse.viatra.dse.objectives.Fitness
import org.eclipse.viatra.dse.objectives.IObjective
final class DseUtils {
private new() {
throw new IllegalStateException("This is a static utility class and should not be instantiated directly.")
}
static def calculateFitness(ThreadContext it, (IObjective)=>Double getFitness) {
val result = new Fitness
var boolean satisifiesHardObjectives = true
for (objective : objectives) {
val fitness = getFitness.apply(objective)
result.put(objective.name, fitness)
if (objective.isHardObjective() && !objective.satisifiesHardObjective(fitness)) {
satisifiesHardObjectives = false
}
}
result.satisifiesHardObjectives = satisifiesHardObjectives
result
}
static def caclulateBestPossibleFitness(ThreadContext threadContext) {
threadContext.calculateFitness [ objective |
if (objective instanceof IThreeValuedObjective) {
objective.getBestPossibleFitness(threadContext)
} else {
switch (objective.comparator) {
case Comparators.LOWER_IS_BETTER:
Double.NEGATIVE_INFINITY
case Comparators.HIGHER_IS_BETTER:
Double.POSITIVE_INFINITY
case Comparators.DIFFERENCE_TO_ZERO_IS_BETTER:
0.0
default:
throw new IllegalArgumentException("Unknown comparator for non-three-valued objective: " +
objective.name)
}
}
]
}
static def caclulateWorstPossibleFitness(ThreadContext threadContext) {
threadContext.calculateFitness [ objective |
if (objective instanceof IThreeValuedObjective) {
objective.getWorstPossibleFitness(threadContext)
} else {
switch (objective.comparator) {
case Comparators.LOWER_IS_BETTER,
case Comparators.DIFFERENCE_TO_ZERO_IS_BETTER:
Double.POSITIVE_INFINITY
case Comparators.HIGHER_IS_BETTER:
Double.NEGATIVE_INFINITY
default:
throw new IllegalArgumentException("Unknown comparator for non-three-valued objective: " +
objective.name)
}
}
]
}
}
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