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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 Aggregate<TSource, TAccumulate, TResult> : Producer<TResult>
{
private readonly IObservable<TSource> _source;
private readonly TAccumulate _seed;
private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
private readonly Func<TAccumulate, TResult> _resultSelector;
public Aggregate(IObservable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator, Func<TAccumulate, TResult> resultSelector)
{
_source = source;
_seed = seed;
_accumulator = accumulator;
_resultSelector = resultSelector;
}
protected override IDisposable Run(IObserver<TResult> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
class _ : Sink<TResult>, IObserver<TSource>
{
private readonly Aggregate<TSource, TAccumulate, TResult> _parent;
private TAccumulate _accumulation;
public _(Aggregate<TSource, TAccumulate, TResult> parent, IObserver<TResult> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_accumulation = _parent._seed;
}
public void OnNext(TSource value)
{
try
{
_accumulation = _parent._accumulator(_accumulation, value);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
var result = default(TResult);
try
{
result = _parent._resultSelector(_accumulation);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
base._observer.OnNext(result);
base._observer.OnCompleted();
base.Dispose();
}
}
}
class Aggregate<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, TSource, TSource> _accumulator;
public Aggregate(IObservable<TSource> source, Func<TSource, TSource, TSource> accumulator)
{
_source = source;
_accumulator = accumulator;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly Aggregate<TSource> _parent;
private TSource _accumulation;
private bool _hasAccumulation;
public _(Aggregate<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_accumulation = default(TSource);
_hasAccumulation = false;
}
public void OnNext(TSource value)
{
if (!_hasAccumulation)
{
_accumulation = value;
_hasAccumulation = true;
}
else
{
try
{
_accumulation = _parent._accumulator(_accumulation, value);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
}
}
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
if (!_hasAccumulation)
{
base._observer.OnError(new InvalidOperationException(Strings_Linq.NO_ELEMENTS));
base.Dispose();
}
else
{
base._observer.OnNext(_accumulation);
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
}
#endif
|
