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package tools.refinery.store.query.view;
import tools.refinery.store.model.Model;
import tools.refinery.store.query.FunctionalDependency;
import tools.refinery.store.representation.Symbol;
import tools.refinery.store.tuple.Tuple;
import tools.refinery.store.tuple.Tuple1;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
public final class FunctionalRelationView<T> extends RelationView<T> {
public FunctionalRelationView(Symbol<T> symbol, String name) {
super(symbol, name);
}
public FunctionalRelationView(Symbol<T> symbol) {
super(symbol);
}
@Override
public Set<FunctionalDependency<Integer>> getFunctionalDependencies() {
var arity = getSymbol().arity();
var forEach = IntStream.range(0, arity).boxed().collect(Collectors.toUnmodifiableSet());
var unique = Set.of(arity);
return Set.of(new FunctionalDependency<>(forEach, unique));
}
@Override
public Set<RelationViewImplication> getImpliedRelationViews() {
var symbol = getSymbol();
var impliedIndices = IntStream.range(0, symbol.arity()).boxed().toList();
var keyOnlyRelationView = new KeyOnlyRelationView<>(symbol);
return Set.of(new RelationViewImplication(this, keyOnlyRelationView, impliedIndices));
}
@Override
public boolean filter(Tuple key, T value) {
return true;
}
@Override
public Object[] forwardMap(Tuple key, T value) {
int size = key.getSize();
Object[] result = new Object[size + 1];
for (int i = 0; i < size; i++) {
result[i] = Tuple.of(key.get(i));
}
result[key.getSize()] = value;
return result;
}
@Override
public boolean get(Model model, Object[] tuple) {
int[] content = new int[tuple.length - 1];
for (int i = 0; i < tuple.length - 1; i++) {
content[i] = ((Tuple1) tuple[i]).value0();
}
Tuple key = Tuple.of(content);
@SuppressWarnings("unchecked")
T valueInTuple = (T) tuple[tuple.length - 1];
T valueInMap = model.getInterpretation(getSymbol()).get(key);
return valueInTuple.equals(valueInMap);
}
@Override
public int arity() {
return getSymbol().arity() + 1;
}
}
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