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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.equality.LiteralHashCodeHelper;
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 class ConstantLiteral extends AbstractLiteral {
private final NodeVariable variable;
private final int nodeId;
public ConstantLiteral(NodeVariable variable, int nodeId) {
this.variable = variable;
this.nodeId = nodeId;
}
public NodeVariable getVariable() {
return variable;
}
public int getNodeId() {
return nodeId;
}
@Override
public Set<Variable> getOutputVariables() {
return Set.of(variable);
}
@Override
public Set<Variable> getInputVariables(Set<? extends Variable> positiveVariablesInClause) {
return Set.of();
}
@Override
public Set<Variable> getPrivateVariables(Set<? extends Variable> positiveVariablesInClause) {
return Set.of();
}
@Override
public ConstantLiteral substitute(Substitution substitution) {
return new ConstantLiteral(substitution.getTypeSafeSubstitute(variable), nodeId);
}
@Override
public boolean equalsWithSubstitution(LiteralEqualityHelper helper, Literal other) {
if (other.getClass() != getClass()) {
return false;
}
var otherConstantLiteral = (ConstantLiteral) other;
return helper.variableEqual(variable, otherConstantLiteral.variable) && nodeId == otherConstantLiteral.nodeId;
}
@Override
public int hashCodeWithSubstitution(LiteralHashCodeHelper helper) {
return Objects.hash(super.hashCodeWithSubstitution(helper), helper.getVariableHashCode(variable), nodeId);
}
@Override
public String toString() {
return "%s === @Constant %d".formatted(variable, nodeId);
}
}
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