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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.ObservableImpl
{
abstract class PushToPullAdapter<TSource, TResult> : IEnumerable<TResult>
{
private readonly IObservable<TSource> _source;
public PushToPullAdapter(IObservable<TSource> source)
{
_source = source;
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public IEnumerator<TResult> GetEnumerator()
{
var d = new SingleAssignmentDisposable();
var res = Run(d);
d.Disposable = _source.SubscribeSafe(res);
return res;
}
protected abstract PushToPullSink<TSource, TResult> Run(IDisposable subscription);
}
abstract class PushToPullSink<TSource, TResult> : IObserver<TSource>, IEnumerator<TResult>, IDisposable
{
private readonly IDisposable _subscription;
public PushToPullSink(IDisposable subscription)
{
_subscription = subscription;
}
public abstract void OnNext(TSource value);
public abstract void OnError(Exception error);
public abstract void OnCompleted();
public abstract bool TryMoveNext(out TResult current);
private bool _done;
public bool MoveNext()
{
if (!_done)
{
var current = default(TResult);
if (TryMoveNext(out current))
{
Current = current;
return true;
}
else
{
_done = true;
_subscription.Dispose();
}
}
return false;
}
public TResult Current
{
get;
private set;
}
object IEnumerator.Current
{
get { return Current; }
}
public void Reset()
{
throw new NotSupportedException();
}
public void Dispose()
{
_subscription.Dispose();
}
}
}
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