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package tools.refinery.store.query.viatra.internal.update;
import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
import tools.refinery.store.query.view.RelationView;
import tools.refinery.store.tuple.Tuple;
import java.util.Arrays;
public class TupleChangingRelationViewUpdateListener<T> extends RelationViewUpdateListener<T> {
private final RelationView<T> relationView;
TupleChangingRelationViewUpdateListener(RelationView<T> relationView) {
this.relationView = relationView;
}
@Override
public void put(Tuple key, T fromValue, T toValue, boolean restoring) {
boolean fromPresent = relationView.filter(key, fromValue);
boolean toPresent = relationView.filter(key, toValue);
if (fromPresent) {
if (toPresent) { // value change
var fromArray = relationView.forwardMap(key, fromValue);
var toArray = relationView.forwardMap(key, toValue);
if (!Arrays.equals(fromArray, toArray)) {
processUpdate(Tuples.flatTupleOf(fromArray), false);
processUpdate(Tuples.flatTupleOf(toArray), true);
}
} else { // fromValue disappears
processUpdate(Tuples.flatTupleOf(relationView.forwardMap(key, fromValue)), false);
}
} else if (toPresent) { // toValue disappears
processUpdate(Tuples.flatTupleOf(relationView.forwardMap(key, toValue)), true);
}
}
}
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