55 lines
1.7 KiB
C#
55 lines
1.7 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 sealed class If<TResult> : Producer<TResult, If<TResult>._>, IEvaluatableObservable<TResult>
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{
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private readonly Func<bool> _condition;
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private readonly IObservable<TResult> _thenSource;
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private readonly IObservable<TResult> _elseSource;
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public If(Func<bool> condition, IObservable<TResult> thenSource, IObservable<TResult> elseSource)
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{
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_condition = condition;
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_thenSource = thenSource;
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_elseSource = elseSource;
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}
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public IObservable<TResult> Eval() => _condition() ? _thenSource : _elseSource;
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protected override _ CreateSink(IObserver<TResult> observer) => new(this, observer);
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protected override void Run(_ sink) => sink.Run();
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internal sealed class _ : IdentitySink<TResult>
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{
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private readonly If<TResult> _parent;
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public _(If<TResult> parent, IObserver<TResult> observer)
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: base(observer)
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{
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_parent = parent;
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}
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public void Run()
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{
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IObservable<TResult> result;
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try
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{
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result = _parent.Eval();
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}
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catch (Exception exception)
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{
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ForwardOnError(exception);
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return;
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}
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SetUpstream(result.SubscribeSafe(this));
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}
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}
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}
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}
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