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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.DataVariable;
import tools.refinery.store.query.term.Term;
import tools.refinery.store.query.term.Variable;
import java.util.Collections;
import java.util.Objects;
import java.util.Set;
public record AssignLiteral<T>(DataVariable<T> variable, Term<T> term) implements Literal {
public AssignLiteral {
if (!term.getType().equals(variable.getType())) {
throw new IllegalArgumentException("Term %s must be of type %s, got %s instead".formatted(
term, variable.getType().getName(), term.getType().getName()));
}
var inputVariables = term.getInputVariables();
if (inputVariables.contains(variable)) {
throw new IllegalArgumentException("Result variable %s must not appear in the term %s".formatted(
variable, term));
}
}
@Override
public Set<Variable> getOutputVariables() {
return Set.of(variable);
}
@Override
public Set<Variable> getInputVariables(Set<? extends Variable> positiveVariablesInClause) {
return Collections.unmodifiableSet(term.getInputVariables());
}
@Override
public Set<Variable> getPrivateVariables(Set<? extends Variable> positiveVariablesInClause) {
return Set.of();
}
@Override
public Literal substitute(Substitution substitution) {
return new AssignLiteral<>(substitution.getTypeSafeSubstitute(variable), term.substitute(substitution));
}
@Override
public boolean equalsWithSubstitution(LiteralEqualityHelper helper, Literal other) {
if (other == null || getClass() != other.getClass()) {
return false;
}
var otherLetLiteral = (AssignLiteral<?>) other;
return helper.variableEqual(variable, otherLetLiteral.variable) && term.equalsWithSubstitution(helper,
otherLetLiteral.term);
}
@Override
public String toString() {
return "%s is (%s)".formatted(variable, term);
}
@Override
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj == null || obj.getClass() != this.getClass()) return false;
var that = (AssignLiteral<?>) obj;
return Objects.equals(this.variable, that.variable) &&
Objects.equals(this.term, that.term);
}
@Override
public int hashCode() {
return Objects.hash(getClass(), variable, term);
}
}
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