NullableLongSumAggregationOperator.cs

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using System.Collections.Generic;
using System.Threading;
 
namespace System.Linq.Parallel;
 
internal sealed class NullableLongSumAggregationOperator : InlinedAggregationOperator<long?, long?, long?>
{
    private sealed class NullableLongSumAggregationOperatorEnumerator<TKey> : InlinedAggregationOperatorEnumerator<long?>
    {
        private readonly QueryOperatorEnumerator<long?, TKey> _source;
 
        internal NullableLongSumAggregationOperatorEnumerator(QueryOperatorEnumerator<long?, TKey> source, int partitionIndex, CancellationToken cancellationToken)
            : base(partitionIndex, cancellationToken)
        {
            _source = source;
        }
 
        protected override bool MoveNextCore(ref long? currentElement)
        {
            long? currentElement2 = null;
            TKey currentKey = default(TKey);
            QueryOperatorEnumerator<long?, TKey> source = _source;
            if (source.MoveNext(ref currentElement2, ref currentKey))
            {
                long num = 0L;
                int num2 = 0;
                do
                {
                    if ((num2++ & 0x3F) == 0)
                    {
                        _cancellationToken.ThrowIfCancellationRequested();
                    }
                    num = checked(num + currentElement2.GetValueOrDefault());
                }
                while (source.MoveNext(ref currentElement2, ref currentKey));
                currentElement = num;
                return true;
            }
            return false;
        }
 
        protected override void Dispose(bool disposing)
        {
            _source.Dispose();
        }
    }
 
    internal NullableLongSumAggregationOperator(IEnumerable<long?> child)
        : base(child)
    {
    }
 
    protected override long? InternalAggregate(ref Exception singularExceptionToThrow)
    {
        using IEnumerator<long?> enumerator = GetEnumerator(ParallelMergeOptions.FullyBuffered, suppressOrderPreservation: true);
        long num = 0L;
        while (enumerator.MoveNext())
        {
            num = checked(num + enumerator.Current.GetValueOrDefault());
        }
        return num;
    }
 
    protected override QueryOperatorEnumerator<long?, int> CreateEnumerator<TKey>(int index, int count, QueryOperatorEnumerator<long?, TKey> source, object sharedData, CancellationToken cancellationToken)
    {
        return new NullableLongSumAggregationOperatorEnumerator<TKey>(source, index, cancellationToken);
    }
}