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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
{
abstract class Select<TResult> : Producer<TResult>
{
public abstract IObservable<TResult2> Ω<TResult2>(Func<TResult, TResult2> selector);
}
class Select<TSource, TResult> : Select<TResult>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, TResult> _selector;
private readonly Func<TSource, int, TResult> _selectorI;
public Select(IObservable<TSource> source, Func<TSource, TResult> selector)
{
_source = source;
_selector = selector;
}
public Select(IObservable<TSource> source, Func<TSource, int, TResult> selector)
{
_source = source;
_selectorI = selector;
}
public override IObservable<TResult2> Ω<TResult2>(Func<TResult, TResult2> selector)
{
if (_selector != null)
return new Select<TSource, TResult2>(_source, x => selector(_selector(x)));
else
return new Select<TResult, TResult2>(this, selector);
}
protected override IDisposable Run(IObserver<TResult> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_selector != null)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
else
{
var sink = new τ(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
}
class _ : Sink<TResult>, IObserver<TSource>
{
private readonly Select<TSource, TResult> _parent;
public _(Select<TSource, TResult> parent, IObserver<TResult> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public void OnNext(TSource value)
{
var result = default(TResult);
try
{
result = _parent._selector(value);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
base._observer.OnNext(result);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
class τ : Sink<TResult>, IObserver<TSource>
{
private readonly Select<TSource, TResult> _parent;
private int _index;
public τ(Select<TSource, TResult> parent, IObserver<TResult> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_index = 0;
}
public void OnNext(TSource value)
{
var result = default(TResult);
try
{
result = _parent._selectorI(value, checked(_index++));
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
base._observer.OnNext(result);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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