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package hu.bme.mit.inf.dslreasoner.viatrasolver.reasoner.optimization
import org.eclipse.viatra.dse.base.ThreadContext
import org.eclipse.viatra.query.runtime.api.IPatternMatch
import org.eclipse.viatra.query.runtime.api.IQuerySpecification
import org.eclipse.viatra.query.runtime.api.ViatraQueryMatcher
class QueryBasedObjective extends DirectionalThresholdObjective {
val IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> querySpecification
ViatraQueryMatcher<? extends IPatternMatch> matcher
new(IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> querySpecification,
ObjectiveKind kind, ObjectiveThreshold threshold, int level) {
super(querySpecification.simpleName + " objective", kind, threshold, level)
if (querySpecification.parameters.size != 1) {
throw new IllegalArgumentException("Objective query must have a single parameter")
}
this.querySpecification = querySpecification
}
override createNew() {
new QueryBasedObjective(querySpecification, kind, threshold, level)
}
override init(ThreadContext context) {
matcher = querySpecification.getMatcher(context.queryEngine)
}
override protected getRawFitness(ThreadContext context) {
val iterator = matcher.allMatches.iterator
if (!iterator.hasNext) {
return invalidValue
}
val value = iterator.next.get(0)
if (iterator.hasNext) {
throw new IllegalStateException("Multiple matches for objective query")
}
if (value instanceof Number) {
value.doubleValue
} else {
throw new IllegalStateException("Objective value is not an instance of Number")
}
}
private def getInvalidValue() {
kind.invalidValue
}
}
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