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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;
namespace System.Reactive.Linq.Observαble
{
class Count<TSource> : Producer<int>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, bool> _predicate;
public Count(IObservable<TSource> source)
{
_source = source;
}
public Count(IObservable<TSource> source, Func<TSource, bool> predicate)
{
_source = source;
_predicate = predicate;
}
protected override IDisposable Run(IObserver<int> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_predicate == null)
{
var sink = new _(observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
else
{
var sink = new π(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
}
class _ : Sink<int>, IObserver<TSource>
{
private int _count;
public _(IObserver<int> observer, IDisposable cancel)
: base(observer, cancel)
{
_count = 0;
}
public void OnNext(TSource value)
{
try
{
checked
{
_count++;
}
}
catch (Exception ex)
{
base._observer.OnError(ex);
base.Dispose();
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnNext(_count);
base._observer.OnCompleted();
base.Dispose();
}
}
class π : Sink<int>, IObserver<TSource>
{
private readonly Count<TSource> _parent;
private int _count;
public π(Count<TSource> parent, IObserver<int> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_count = 0;
}
public void OnNext(TSource value)
{
try
{
checked
{
if (_parent._predicate(value))
_count++;
}
}
catch (Exception ex)
{
base._observer.OnError(ex);
base.Dispose();
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnNext(_count);
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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