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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.reasoning.translator.multiobject;
import tools.refinery.store.query.dnf.Query;
import tools.refinery.store.query.dnf.RelationalQuery;
import tools.refinery.store.query.literal.AbstractCallLiteral;
import tools.refinery.store.query.literal.CallLiteral;
import tools.refinery.store.query.literal.Literal;
import tools.refinery.store.query.term.Variable;
import tools.refinery.store.query.view.AnySymbolView;
import tools.refinery.store.reasoning.interpretation.QueryBasedRelationRewriter;
import tools.refinery.store.reasoning.literal.Concreteness;
import tools.refinery.store.reasoning.literal.Modality;
import tools.refinery.store.representation.cardinality.UpperCardinalities;
import tools.refinery.store.representation.cardinality.UpperCardinality;
import java.util.List;
import java.util.Set;
import static tools.refinery.store.query.literal.Literals.check;
import static tools.refinery.store.query.term.uppercardinality.UpperCardinalityTerms.constant;
import static tools.refinery.store.query.term.uppercardinality.UpperCardinalityTerms.lessEq;
class EqualsRelationRewriter extends QueryBasedRelationRewriter {
private EqualsRelationRewriter(RelationalQuery may, RelationalQuery must) {
super(may, must, may, may);
}
@Override
public List<Literal> rewriteLiteral(Set<Variable> positiveVariables, AbstractCallLiteral literal,
Modality modality, Concreteness concreteness) {
if (!(literal instanceof CallLiteral callLiteral)) {
return super.rewriteLiteral(positiveVariables, literal, modality, concreteness);
}
var left = callLiteral.getArguments().get(0).asNodeVariable();
var right = callLiteral.getArguments().get(1).asNodeVariable();
boolean useMay = modality == Modality.MAY || concreteness == Concreteness.CANDIDATE;
return switch (callLiteral.getPolarity()) {
case POSITIVE, TRANSITIVE -> {
if (useMay) {
if (positiveVariables.contains(left) || positiveVariables.contains(right)) {
// No need to enumerate arguments if at least one is already bound, since they will be unified.
yield List.of(left.isEquivalent(right));
} else {
yield List.of(
left.isEquivalent(right),
getMay().call(left, right)
);
}
} else {
yield List.of(
left.isEquivalent(right),
getMust().call(left, right)
);
}
}
case NEGATIVE -> {
if (useMay) {
yield List.of(left.notEquivalent(right));
} else {
yield super.rewriteLiteral(positiveVariables, literal, modality, concreteness);
}
}
};
}
public static EqualsRelationRewriter of(AnySymbolView upperCardinalityView) {
var may = Query.of("equals#may", (builder, p1, p2) -> builder
.clause(
p1.isEquivalent(p2),
upperCardinalityView.call(p1, Variable.of(UpperCardinality.class))
));
var must = Query.of("equals#must", (builder, p1, p2) -> builder
.clause(UpperCardinality.class, upper -> List.of(
p1.isEquivalent(p2),
upperCardinalityView.call(p1, upper),
check(lessEq(upper, constant(UpperCardinalities.ONE)))
)));
return new EqualsRelationRewriter(may, must);
}
}
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