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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.query.literal;
import tools.refinery.store.query.equality.LiteralEqualityHelper;
import tools.refinery.store.query.substitution.Substitution;
import tools.refinery.store.query.term.NodeVariable;
import tools.refinery.store.query.term.Variable;
import java.util.Objects;
import java.util.Set;
public record EquivalenceLiteral(boolean positive, NodeVariable left, NodeVariable right)
implements CanNegate<EquivalenceLiteral> {
@Override
public Set<Variable> getOutputVariables() {
return Set.of(left);
}
@Override
public Set<Variable> getInputVariables(Set<? extends Variable> positiveVariablesInClause) {
return Set.of(right);
}
@Override
public Set<Variable> getPrivateVariables(Set<? extends Variable> positiveVariablesInClause) {
return Set.of();
}
@Override
public EquivalenceLiteral negate() {
return new EquivalenceLiteral(!positive, left, right);
}
@Override
public EquivalenceLiteral substitute(Substitution substitution) {
return new EquivalenceLiteral(positive, substitution.getTypeSafeSubstitute(left),
substitution.getTypeSafeSubstitute(right));
}
@Override
public Literal reduce() {
if (left.equals(right)) {
return positive ? BooleanLiteral.TRUE : BooleanLiteral.FALSE;
}
return this;
}
@Override
public boolean equalsWithSubstitution(LiteralEqualityHelper helper, Literal other) {
if (other.getClass() != getClass()) {
return false;
}
var otherEquivalenceLiteral = (EquivalenceLiteral) other;
return helper.variableEqual(left, otherEquivalenceLiteral.left) && helper.variableEqual(right,
otherEquivalenceLiteral.right);
}
@Override
public String toString() {
return "%s %s %s".formatted(left, positive ? "===" : "!==", right);
}
@Override
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj == null || obj.getClass() != this.getClass()) return false;
var that = (EquivalenceLiteral) obj;
return this.positive == that.positive &&
Objects.equals(this.left, that.left) &&
Objects.equals(this.right, that.right);
}
@Override
public int hashCode() {
return Objects.hash(getClass(), positive, left, right);
}
}
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