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package hu.bme.mit.inf.dslreasoner.viatrasolver.reasoner.optimization
import com.google.common.collect.ImmutableList
import java.util.Collection
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
import org.eclipse.xtend.lib.annotations.Data
@Data
class ThreeValuedCostElement {
val IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> currentMatchQuery
val IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> mayMatchQuery
val IQuerySpecification<? extends ViatraQueryMatcher<? extends IPatternMatch>> mustMatchQuery
val int weight
}
class ThreeValuedCostObjective extends AbstractThreeValuedObjective {
val Collection<ThreeValuedCostElement> costElements
Collection<CostElementMatchers> matchers
new(String name, Collection<ThreeValuedCostElement> costElements, ObjectiveKind kind, ObjectiveThreshold threshold,
int level) {
super(name, kind, threshold, level)
this.costElements = costElements
}
override createNew() {
new ThreeValuedCostObjective(name, costElements, kind, threshold, level)
}
override init(ThreadContext context) {
val queryEngine = context.queryEngine
matchers = ImmutableList.copyOf(costElements.map [ element |
new CostElementMatchers(
queryEngine.getMatcher(element.currentMatchQuery),
queryEngine.getMatcher(element.mayMatchQuery),
queryEngine.getMatcher(element.mustMatchQuery),
element.weight
)
])
}
override getRawFitness(ThreadContext context) {
var int cost = 0
for (matcher : matchers) {
cost += matcher.weight * matcher.currentMatcher.countMatches
}
cost as double
}
override getLowestPossibleFitness(ThreadContext threadContext) {
var int cost = 0
for (matcher : matchers) {
if (matcher.weight >= 0) {
cost += matcher.weight * matcher.mustMatcher.countMatches
} else if (matcher.mayMatcher.countMatches > 0) {
// TODO Count may matches.
return Double.NEGATIVE_INFINITY
}
}
cost as double
}
override getHighestPossibleFitness(ThreadContext threadContext) {
var int cost = 0
for (matcher : matchers) {
if (matcher.weight <= 0) {
cost += matcher.weight * matcher.mustMatcher.countMatches
} else if (matcher.mayMatcher.countMatches > 0) {
return Double.POSITIVE_INFINITY
}
}
cost as double
}
@Data
private static class CostElementMatchers {
val ViatraQueryMatcher<? extends IPatternMatch> currentMatcher
val ViatraQueryMatcher<? extends IPatternMatch> mayMatcher
val ViatraQueryMatcher<? extends IPatternMatch> mustMatcher
val int weight
}
}
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