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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.term.uppercardinality;
import tools.refinery.store.query.term.StatefulAggregate;
import tools.refinery.store.query.term.StatefulAggregator;
import tools.refinery.store.representation.cardinality.FiniteUpperCardinality;
import tools.refinery.store.representation.cardinality.UnboundedUpperCardinality;
import tools.refinery.store.representation.cardinality.UpperCardinalities;
import tools.refinery.store.representation.cardinality.UpperCardinality;
public class UpperCardinalitySumAggregator implements StatefulAggregator<UpperCardinality, UpperCardinality> {
public static final UpperCardinalitySumAggregator INSTANCE = new UpperCardinalitySumAggregator();
private UpperCardinalitySumAggregator() {
}
@Override
public Class<UpperCardinality> getResultType() {
return UpperCardinality.class;
}
@Override
public Class<UpperCardinality> getInputType() {
return UpperCardinality.class;
}
@Override
public StatefulAggregate<UpperCardinality, UpperCardinality> createEmptyAggregate() {
return new Aggregate();
}
private static class Aggregate implements StatefulAggregate<UpperCardinality, UpperCardinality> {
private int sumFiniteUpperBounds;
private int countUnbounded;
public Aggregate() {
this(0, 0);
}
private Aggregate(int sumFiniteUpperBounds, int countUnbounded) {
this.sumFiniteUpperBounds = sumFiniteUpperBounds;
this.countUnbounded = countUnbounded;
}
@Override
public void add(UpperCardinality value) {
if (value instanceof FiniteUpperCardinality finiteUpperCardinality) {
sumFiniteUpperBounds += finiteUpperCardinality.finiteUpperBound();
} else if (value instanceof UnboundedUpperCardinality) {
countUnbounded += 1;
} else {
throw new IllegalArgumentException("Unknown UpperCardinality: " + value);
}
}
@Override
public void remove(UpperCardinality value) {
if (value instanceof FiniteUpperCardinality finiteUpperCardinality) {
sumFiniteUpperBounds -= finiteUpperCardinality.finiteUpperBound();
} else if (value instanceof UnboundedUpperCardinality) {
countUnbounded -= 1;
} else {
throw new IllegalArgumentException("Unknown UpperCardinality: " + value);
}
}
@Override
public UpperCardinality getResult() {
return countUnbounded > 0 ? UpperCardinalities.UNBOUNDED : UpperCardinalities.valueOf(sumFiniteUpperBounds);
}
@Override
public boolean isEmpty() {
return sumFiniteUpperBounds == 0 && countUnbounded == 0;
}
@Override
public StatefulAggregate<UpperCardinality, UpperCardinality> deepCopy() {
return new Aggregate(sumFiniteUpperBounds, countUnbounded);
}
}
}
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