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/*
* SPDX-FileCopyrightText: 2021-2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.logic.literal;
import tools.refinery.logic.Constraint;
import tools.refinery.logic.InvalidQueryException;
import tools.refinery.logic.equality.LiteralEqualityHelper;
import tools.refinery.logic.equality.LiteralHashCodeHelper;
import tools.refinery.logic.substitution.Substitution;
import tools.refinery.logic.term.*;
import java.util.List;
import java.util.Objects;
import java.util.Set;
// {@link Object#equals(Object)} is implemented by {@link AbstractLiteral}.
@SuppressWarnings("squid:S2160")
public class AggregationLiteral<R, T> extends AbstractCallLiteral {
private final DataVariable<R> resultVariable;
private final DataVariable<T> inputVariable;
private final Aggregator<R, T> aggregator;
public AggregationLiteral(DataVariable<R> resultVariable, Aggregator<R, T> aggregator,
DataVariable<T> inputVariable, Constraint target, List<Variable> arguments) {
super(target, arguments);
if (!inputVariable.getType().equals(aggregator.getInputType())) {
throw new InvalidQueryException("Input variable %s must of type %s, got %s instead".formatted(
inputVariable, aggregator.getInputType().getName(), inputVariable.getType().getName()));
}
if (!getArgumentsOfDirection(ParameterDirection.OUT).contains(inputVariable)) {
throw new InvalidQueryException("Input variable %s must be bound with direction %s in the argument list"
.formatted(inputVariable, ParameterDirection.OUT));
}
if (!resultVariable.getType().equals(aggregator.getResultType())) {
throw new InvalidQueryException("Result variable %s must of type %s, got %s instead".formatted(
resultVariable, aggregator.getResultType().getName(), resultVariable.getType().getName()));
}
if (arguments.contains(resultVariable)) {
throw new InvalidQueryException("Result variable %s must not appear in the argument list".formatted(
resultVariable));
}
this.resultVariable = resultVariable;
this.inputVariable = inputVariable;
this.aggregator = aggregator;
}
public DataVariable<R> getResultVariable() {
return resultVariable;
}
public DataVariable<T> getInputVariable() {
return inputVariable;
}
public Aggregator<R, T> getAggregator() {
return aggregator;
}
@Override
public Set<Variable> getOutputVariables() {
return Set.of(resultVariable);
}
@Override
public Set<Variable> getInputVariables(Set<? extends Variable> positiveVariablesInClause) {
if (positiveVariablesInClause.contains(inputVariable)) {
throw new InvalidQueryException("Aggregation variable %s must not be bound".formatted(inputVariable));
}
return super.getInputVariables(positiveVariablesInClause);
}
@Override
public Literal reduce() {
var reduction = getTarget().getReduction();
return switch (reduction) {
case ALWAYS_FALSE -> {
var emptyValue = aggregator.getEmptyResult();
yield emptyValue == null ? BooleanLiteral.FALSE :
resultVariable.assign(new ConstantTerm<>(resultVariable.getType(), emptyValue));
}
case ALWAYS_TRUE -> throw new InvalidQueryException("Trying to aggregate over an infinite set");
case NOT_REDUCIBLE -> this;
};
}
@Override
protected Literal doSubstitute(Substitution substitution, List<Variable> substitutedArguments) {
return new AggregationLiteral<>(substitution.getTypeSafeSubstitute(resultVariable), aggregator,
substitution.getTypeSafeSubstitute(inputVariable), getTarget(), substitutedArguments);
}
@Override
public AbstractCallLiteral withArguments(Constraint newTarget, List<Variable> newArguments) {
return new AggregationLiteral<>(resultVariable, aggregator, inputVariable, newTarget, newArguments);
}
@Override
public boolean equalsWithSubstitution(LiteralEqualityHelper helper, Literal other) {
if (!super.equalsWithSubstitution(helper, other)) {
return false;
}
var otherAggregationLiteral = (AggregationLiteral<?, ?>) other;
return helper.variableEqual(resultVariable, otherAggregationLiteral.resultVariable) &&
aggregator.equals(otherAggregationLiteral.aggregator) &&
helper.variableEqual(inputVariable, otherAggregationLiteral.inputVariable);
}
@Override
public int hashCodeWithSubstitution(LiteralHashCodeHelper helper) {
return Objects.hash(super.hashCodeWithSubstitution(helper), helper.getVariableHashCode(resultVariable),
helper.getVariableHashCode(inputVariable), aggregator);
}
@Override
public String toString() {
var builder = new StringBuilder();
builder.append(resultVariable);
builder.append(" is ");
builder.append(getTarget().toReferenceString());
builder.append("(");
var argumentIterator = getArguments().iterator();
if (argumentIterator.hasNext()) {
var argument = argumentIterator.next();
if (inputVariable.equals(argument)) {
builder.append("@Aggregate(\"").append(aggregator).append("\") ");
}
builder.append(argument);
while (argumentIterator.hasNext()) {
builder.append(", ");
argument = argumentIterator.next();
if (inputVariable.equals(argument)) {
builder.append("@Aggregate(\"").append(aggregator).append("\") ");
}
builder.append(argument);
}
}
builder.append(")");
return builder.toString();
}
}
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