63 lines
1.8 KiB
C#
63 lines
1.8 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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using System.Collections.Generic;
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namespace System.Reactive.Linq.ObservableImpl
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{
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internal sealed class Case<TValue, TResult> : Producer<TResult, Case<TValue, TResult>._>, IEvaluatableObservable<TResult>
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where TValue : notnull
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{
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private readonly Func<TValue> _selector;
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private readonly IDictionary<TValue, IObservable<TResult>> _sources;
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private readonly IObservable<TResult> _defaultSource;
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public Case(Func<TValue> selector, IDictionary<TValue, IObservable<TResult>> sources, IObservable<TResult> defaultSource)
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{
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_selector = selector;
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_sources = sources;
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_defaultSource = defaultSource;
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}
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public IObservable<TResult> Eval()
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{
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if (_sources.TryGetValue(_selector(), out var res))
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{
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return res;
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}
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return _defaultSource;
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}
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protected override _ CreateSink(IObserver<TResult> observer) => new(observer);
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protected override void Run(_ sink) => sink.Run(this);
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internal sealed class _ : IdentitySink<TResult>
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{
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public _(IObserver<TResult> observer)
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: base(observer)
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{
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}
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public void Run(Case<TValue, TResult> parent)
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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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Run(result);
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}
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}
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}
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}
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