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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 LastAsync<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, bool> _predicate;
private readonly bool _throwOnEmpty;
public LastAsync(IObservable<TSource> source, Func<TSource, bool> predicate, bool throwOnEmpty)
{
_source = source;
_predicate = predicate;
_throwOnEmpty = throwOnEmpty;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_predicate != null)
{
var sink = new LastAsyncImpl(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
else
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly LastAsync<TSource> _parent;
private TSource _value;
private bool _seenValue;
public _(LastAsync<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_value = default(TSource);
_seenValue = false;
}
public void OnNext(TSource value)
{
_value = value;
_seenValue = true;
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
if (!_seenValue && _parent._throwOnEmpty)
{
base._observer.OnError(new InvalidOperationException(Strings_Linq.NO_ELEMENTS));
}
else
{
base._observer.OnNext(_value);
base._observer.OnCompleted();
}
base.Dispose();
}
}
class LastAsyncImpl : Sink<TSource>, IObserver<TSource>
{
private readonly LastAsync<TSource> _parent;
private TSource _value;
private bool _seenValue;
public LastAsyncImpl(LastAsync<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_value = default(TSource);
_seenValue = false;
}
public void OnNext(TSource value)
{
var b = false;
try
{
b = _parent._predicate(value);
}
catch (Exception ex)
{
base._observer.OnError(ex);
base.Dispose();
return;
}
if (b)
{
_value = value;
_seenValue = true;
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
if (!_seenValue && _parent._throwOnEmpty)
{
base._observer.OnError(new InvalidOperationException(Strings_Linq.NO_MATCHING_ELEMENTS));
}
else
{
base._observer.OnNext(_value);
base._observer.OnCompleted();
}
base.Dispose();
}
}
}
}
#endif
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