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// 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.ObservableImpl
{
class If<TResult> : Producer<TResult>, IEvaluatableObservable<TResult>
{
private readonly Func<bool> _condition;
private readonly IObservable<TResult> _thenSource;
private readonly IObservable<TResult> _elseSource;
public If(Func<bool> condition, IObservable<TResult> thenSource, IObservable<TResult> elseSource)
{
_condition = condition;
_thenSource = thenSource;
_elseSource = elseSource;
}
public IObservable<TResult> Eval()
{
return _condition() ? _thenSource : _elseSource;
}
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 If<TResult> _parent;
public _(If<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
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