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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;
using System.Collections.Generic;
namespace System.Reactive.Linq.ObservableImpl
{
class Distinct<TSource, TKey> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, TKey> _keySelector;
private readonly IEqualityComparer<TKey> _comparer;
public Distinct(IObservable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)
{
_source = source;
_keySelector = keySelector;
_comparer = comparer;
}
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 Distinct<TSource, TKey> _parent;
private HashSet<TKey> _hashSet;
public _(Distinct<TSource, TKey> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_hashSet = new HashSet<TKey>(_parent._comparer);
}
public void OnNext(TSource value)
{
var key = default(TKey);
var hasAdded = false;
try
{
key = _parent._keySelector(value);
hasAdded = _hashSet.Add(key);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
if (hasAdded)
base._observer.OnNext(value);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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