77 lines
2.7 KiB
C#
77 lines
2.7 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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using System.Collections.Generic;
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namespace System.Reactive.Linq.ObservableImpl
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{
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internal sealed class ToDictionary<TSource, TKey, TElement> : Producer<IDictionary<TKey, TElement>, ToDictionary<TSource, TKey, TElement>._>
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where TKey : notnull
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{
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private readonly IObservable<TSource> _source;
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private readonly Func<TSource, TKey> _keySelector;
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private readonly Func<TSource, TElement> _elementSelector;
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private readonly IEqualityComparer<TKey> _comparer;
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public ToDictionary(IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer)
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{
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_source = source;
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_keySelector = keySelector;
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_elementSelector = elementSelector;
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_comparer = comparer;
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}
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protected override _ CreateSink(IObserver<IDictionary<TKey, TElement>> observer) => new(this, observer);
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protected override void Run(_ sink) => sink.Run(_source);
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internal sealed class _ : Sink<TSource, IDictionary<TKey, TElement>>
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{
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private readonly Func<TSource, TKey> _keySelector;
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private readonly Func<TSource, TElement> _elementSelector;
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private Dictionary<TKey, TElement> _dictionary;
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public _(ToDictionary<TSource, TKey, TElement> parent, IObserver<IDictionary<TKey, TElement>> observer)
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: base(observer)
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{
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_keySelector = parent._keySelector;
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_elementSelector = parent._elementSelector;
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_dictionary = new Dictionary<TKey, TElement>(parent._comparer);
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}
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public override void OnNext(TSource value)
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{
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try
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{
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_dictionary.Add(_keySelector(value), _elementSelector(value));
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}
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catch (Exception ex)
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{
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Cleanup();
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ForwardOnError(ex);
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}
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}
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public override void OnError(Exception error)
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{
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Cleanup();
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ForwardOnError(error);
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}
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public override void OnCompleted()
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{
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var dictionary = _dictionary;
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Cleanup();
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ForwardOnNext(dictionary);
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ForwardOnCompleted();
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}
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private void Cleanup()
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{
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_dictionary = null!;
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}
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}
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}
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}
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