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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.ObservableImpl
{
class TakeWhile<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, bool> _predicate;
private readonly Func<TSource, int, bool> _predicateI;
public TakeWhile(IObservable<TSource> source, Func<TSource, bool> predicate)
{
_source = source;
_predicate = predicate;
}
public TakeWhile(IObservable<TSource> source, Func<TSource, int, bool> predicate)
{
_source = source;
_predicateI = predicate;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_predicate != null)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
else
{
var sink = new TakeWhileImpl(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly TakeWhile<TSource> _parent;
private bool _running;
public _(TakeWhile<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_running = true;
}
public void OnNext(TSource value)
{
if (_running)
{
try
{
_running = _parent._predicate(value);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
if (_running)
{
base._observer.OnNext(value);
}
else
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
class TakeWhileImpl : Sink<TSource>, IObserver<TSource>
{
private readonly TakeWhile<TSource> _parent;
private bool _running;
private int _index;
public TakeWhileImpl(TakeWhile<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_running = true;
_index = 0;
}
public void OnNext(TSource value)
{
if (_running)
{
try
{
_running = _parent._predicateI(value, checked(_index++));
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
if (_running)
{
base._observer.OnNext(value);
}
else
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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