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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.interpreter.internal.pquery;
import tools.refinery.interpreter.matchers.psystem.aggregations.IMultisetAggregationOperator;
import tools.refinery.logic.term.StatelessAggregator;
import java.util.stream.Stream;
record StatelessMultisetAggregator<R, T>(StatelessAggregator<R, T> aggregator)
implements IMultisetAggregationOperator<T, R, R> {
@Override
public String getShortDescription() {
return getName();
}
@Override
public String getName() {
return aggregator.toString();
}
@Override
public R createNeutral() {
return aggregator.getEmptyResult();
}
@Override
public boolean isNeutral(R result) {
return createNeutral().equals(result);
}
@Override
public R update(R oldResult, T updateValue, boolean isInsertion) {
return isInsertion ? aggregator.add(oldResult, updateValue) : aggregator.remove(oldResult, updateValue);
}
@Override
public R getAggregate(R result) {
return result;
}
@Override
public R clone(R original) {
// Aggregate result is immutable.
return original;
}
@Override
public R aggregateStream(Stream<T> stream) {
return aggregator.aggregateStream(stream);
}
}
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