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Aggregate.cs
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Aggregate.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
namespace System.Reactive.Linq.ObservableImpl
{
internal sealed class Aggregate<TSource> : Producer<TSource, Aggregate<TSource>._>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, TSource, TSource> _accumulator;
public Aggregate(IObservable<TSource> source, Func<TSource, TSource, TSource> accumulator)
{
_source = source;
_accumulator = accumulator;
}
protected override _ CreateSink(IObserver<TSource> observer) => new _(_accumulator, observer);
protected override void Run(_ sink) => sink.Run(_source);
internal sealed class _ : IdentitySink<TSource>
{
private readonly Func<TSource, TSource, TSource> _accumulator;
private TSource _accumulation;
private bool _hasAccumulation;
public _(Func<TSource, TSource, TSource> accumulator, IObserver<TSource> observer)
: base(observer)
{
_accumulator = accumulator;
}
public override void OnNext(TSource value)
{
if (!_hasAccumulation)
{
_accumulation = value;
_hasAccumulation = true;
}
else
{
try
{
_accumulation = _accumulator(_accumulation, value);
}
catch (Exception exception)
{
_accumulation = default;
ForwardOnError(exception);
}
}
}
public override void OnError(Exception error)
{
_accumulation = default;
ForwardOnError(error);
}
public override void OnCompleted()
{
if (!_hasAccumulation)
{
ForwardOnError(new InvalidOperationException(Strings_Linq.NO_ELEMENTS));
}
else
{
var accumulation = _accumulation;
_accumulation = default;
ForwardOnNext(accumulation);
ForwardOnCompleted();
}
}
}
}
internal sealed class Aggregate<TSource, TAccumulate> : Producer<TAccumulate, Aggregate<TSource, TAccumulate>._>
{
private readonly IObservable<TSource> _source;
private readonly TAccumulate _seed;
private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
public Aggregate(IObservable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator)
{
_source = source;
_seed = seed;
_accumulator = accumulator;
}
protected override _ CreateSink(IObserver<TAccumulate> observer) => new _(_seed, _accumulator, observer);
protected override void Run(_ sink) => sink.Run(_source);
internal sealed class _ : Sink<TSource, TAccumulate>
{
private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
private TAccumulate _accumulation;
public _(TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator, IObserver<TAccumulate> observer)
: base(observer)
{
_accumulator = accumulator;
_accumulation = seed;
}
public override void OnNext(TSource value)
{
try
{
_accumulation = _accumulator(_accumulation, value);
}
catch (Exception exception)
{
_accumulation = default;
ForwardOnError(exception);
}
}
public override void OnError(Exception error)
{
_accumulation = default;
ForwardOnError(error);
}
public override void OnCompleted()
{
var accumulation = _accumulation;
_accumulation = default;
ForwardOnNext(accumulation);
ForwardOnCompleted();
}
}
}
internal sealed class Aggregate<TSource, TAccumulate, TResult> : Producer<TResult, Aggregate<TSource, TAccumulate, TResult>._>
{
private readonly IObservable<TSource> _source;
private readonly TAccumulate _seed;
private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
private readonly Func<TAccumulate, TResult> _resultSelector;
public Aggregate(IObservable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator, Func<TAccumulate, TResult> resultSelector)
{
_source = source;
_seed = seed;
_accumulator = accumulator;
_resultSelector = resultSelector;
}
protected override _ CreateSink(IObserver<TResult> observer) => new _(this, observer);
protected override void Run(_ sink) => sink.Run(_source);
internal sealed class _ : Sink<TSource, TResult>
{
private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
private readonly Func<TAccumulate, TResult> _resultSelector;
private TAccumulate _accumulation;
public _(Aggregate<TSource, TAccumulate, TResult> parent, IObserver<TResult> observer)
: base(observer)
{
_accumulator = parent._accumulator;
_resultSelector = parent._resultSelector;
_accumulation = parent._seed;
}
public override void OnNext(TSource value)
{
try
{
_accumulation = _accumulator(_accumulation, value);
}
catch (Exception exception)
{
ForwardOnError(exception);
}
}
public override void OnError(Exception error)
{
ForwardOnError(error);
}
public override void OnCompleted()
{
TResult result;
try
{
result = _resultSelector(_accumulation);
}
catch (Exception exception)
{
ForwardOnError(exception);
return;
}
ForwardOnNext(result);
ForwardOnCompleted();
}
}
}
}