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package hu.bme.mit.inf.dslreasoner.domains.satellite.mdeo
import org.eclipse.viatra.query.runtime.api.IPatternMatch
import org.eclipse.viatra.query.runtime.api.IQuerySpecification
import org.eclipse.viatra.query.runtime.api.ViatraQueryMatcher
import uk.ac.kcl.inf.mdeoptimiser.libraries.core.optimisation.IGuidanceFunction
import uk.ac.kcl.inf.mdeoptimiser.libraries.core.optimisation.interpreter.guidance.Solution
abstract class MetricBasedGuidanceFunction implements IGuidanceFunction {
val IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> querySpecification
protected new(IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> querySpecification) {
this.querySpecification = querySpecification
if (querySpecification.parameters.size != 1) {
throw new IllegalArgumentException("Metric must have a single parameter")
}
}
override computeFitness(Solution model) {
val value = getMetricValue(model)
computeFitness(value)
}
protected def double computeFitness(double metricValue) {
metricValue
}
private def getMetricValue(Solution solution) {
val model = solution.model
val queryEngine = LocalSearchEngineManager.INSTANCE.getEngine(model)
val matcher = querySpecification.getMatcher(queryEngine)
val iterator = matcher.allMatches.iterator
if (!iterator.hasNext) {
throw new IllegalStateException("Too few matches")
}
val objectValue = iterator.next.get(0)
if (objectValue instanceof Number) {
val doubleValue = objectValue.doubleValue
if (iterator.hasNext) {
throw new IllegalStateException("Too many matches")
}
doubleValue
} else {
throw new IllegalStateException("Metric value must be a number")
}
}
}
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