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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.logic.term.real;
import tools.refinery.logic.term.StatefulAggregate;
import tools.refinery.logic.term.StatefulAggregator;
import java.util.Map;
import java.util.TreeMap;
public final class RealSumAggregator implements StatefulAggregator<Double, Double> {
public static final RealSumAggregator INSTANCE = new RealSumAggregator();
private RealSumAggregator() {
}
@Override
public Class<Double> getResultType() {
return Double.class;
}
@Override
public Class<Double> getInputType() {
return Double.class;
}
@Override
public StatefulAggregate<Double, Double> createEmptyAggregate() {
return new Aggregate();
}
@Override
public Double getEmptyResult() {
return 0d;
}
private static class Aggregate implements StatefulAggregate<Double, Double> {
private final Map<Double, Integer> values;
public Aggregate() {
values = new TreeMap<>();
}
private Aggregate(Aggregate other) {
values = new TreeMap<>(other.values);
}
@Override
public void add(Double value) {
values.compute(value, (ignoredValue, currentCount) -> currentCount == null ? 1 : currentCount + 1);
}
@Override
public void remove(Double value) {
values.compute(value, (theValue, currentCount) -> {
if (currentCount == null || currentCount <= 0) {
throw new IllegalStateException("Invalid count %d for value %f".formatted(currentCount, theValue));
}
return currentCount.equals(1) ? null : currentCount - 1;
});
}
@Override
public Double getResult() {
return values.entrySet()
.stream()
.mapToDouble(entry -> entry.getKey() * entry.getValue())
.reduce(Double::sum)
.orElse(0d);
}
@Override
public boolean isEmpty() {
return values.isEmpty();
}
@Override
public StatefulAggregate<Double, Double> deepCopy() {
return new Aggregate(this);
}
@Override
public boolean contains(Double value) {
return values.containsKey(value);
}
}
}
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