117 lines
3.5 KiB
C#
117 lines
3.5 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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namespace System.Reactive.Linq.ObservableImpl
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{
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internal static class LastOrDefaultAsync<TSource>
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{
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internal sealed class Sequence : Producer<TSource?, Sequence._>
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{
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private readonly IObservable<TSource> _source;
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public Sequence(IObservable<TSource> source)
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{
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_source = source;
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}
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protected override _ CreateSink(IObserver<TSource?> observer) => new(observer);
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protected override void Run(_ sink) => sink.Run(_source);
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internal sealed class _ : Sink<TSource, TSource?>
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{
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private TSource? _value;
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public _(IObserver<TSource?> observer)
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: base(observer)
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{
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}
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public override void OnNext(TSource value)
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{
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_value = value;
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}
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public override void OnError(Exception error)
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{
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_value = default;
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ForwardOnError(error);
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}
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public override void OnCompleted()
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{
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var value = _value;
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_value = default;
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ForwardOnNext(value);
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ForwardOnCompleted();
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}
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}
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}
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internal sealed class Predicate : Producer<TSource?, Predicate._>
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{
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private readonly IObservable<TSource> _source;
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private readonly Func<TSource, bool> _predicate;
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public Predicate(IObservable<TSource> source, Func<TSource, bool> predicate)
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{
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_source = source;
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_predicate = predicate;
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}
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protected override _ CreateSink(IObserver<TSource?> observer) => new(_predicate, observer);
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protected override void Run(_ sink) => sink.Run(_source);
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internal sealed class _ : Sink<TSource, TSource?>
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{
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private readonly Func<TSource, bool> _predicate;
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private TSource? _value;
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public _(Func<TSource, bool> predicate, IObserver<TSource?> observer)
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: base(observer)
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{
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_predicate = predicate;
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}
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public override void OnNext(TSource value)
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{
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var b = false;
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try
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{
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b = _predicate(value);
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}
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catch (Exception ex)
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{
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_value = default;
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ForwardOnError(ex);
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return;
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}
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if (b)
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{
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_value = value;
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}
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}
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public override void OnError(Exception error)
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{
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_value = default;
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ForwardOnError(error);
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}
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public override void OnCompleted()
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{
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var value = _value;
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_value = default;
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ForwardOnNext(value);
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ForwardOnCompleted();
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}
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}
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}
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}
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}
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