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Diffstat (limited to 'Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Case.cs')
-rw-r--r-- | Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Case.cs | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Case.cs b/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Case.cs new file mode 100644 index 0000000..b104050 --- /dev/null +++ b/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/Case.cs @@ -0,0 +1,85 @@ +// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information. + +#if !NO_PERF +using System; +using System.Collections.Generic; +using System.Reactive.Disposables; + +namespace System.Reactive.Linq.Observαble +{ + class Case<TValue, TResult> : Producer<TResult>, IEvaluatableObservable<TResult> + { + private readonly Func<TValue> _selector; + private readonly IDictionary<TValue, IObservable<TResult>> _sources; + private readonly IObservable<TResult> _defaultSource; + + public Case(Func<TValue> selector, IDictionary<TValue, IObservable<TResult>> sources, IObservable<TResult> defaultSource) + { + _selector = selector; + _sources = sources; + _defaultSource = defaultSource; + } + + public IObservable<TResult> Eval() + { + var res = default(IObservable<TResult>); + if (_sources.TryGetValue(_selector(), out res)) + return res; + + return _defaultSource; + } + + protected override IDisposable Run(IObserver<TResult> observer, IDisposable cancel, Action<IDisposable> setSink) + { + var sink = new _(this, observer, cancel); + setSink(sink); + return sink.Run(); + } + + class _ : Sink<TResult>, IObserver<TResult> + { + private readonly Case<TValue, TResult> _parent; + + public _(Case<TValue, TResult> parent, IObserver<TResult> observer, IDisposable cancel) + : base(observer, cancel) + { + _parent = parent; + } + + public IDisposable Run() + { + var result = default(IObservable<TResult>); + try + { + result = _parent.Eval(); + } + catch (Exception exception) + { + base._observer.OnError(exception); + base.Dispose(); + return Disposable.Empty; + } + + return result.SubscribeSafe(this); + } + + public void OnNext(TResult value) + { + base._observer.OnNext(value); + } + + public void OnError(Exception error) + { + base._observer.OnError(error); + base.Dispose(); + } + + public void OnCompleted() + { + base._observer.OnCompleted(); + base.Dispose(); + } + } + } +} +#endif |