118 lines
3.1 KiB
C#
118 lines
3.1 KiB
C#
//
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// ConcurrentLookup.cs
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//
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// Author:
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// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
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//
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// Copyright (c) 2010 Jérémie "Garuma" Laval
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if NET_4_0
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using System;
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using System.Threading;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.Concurrent;
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namespace System.Linq.Parallel
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{
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internal class ConcurrentLookup<TKey, TElement> : ILookup<TKey, TElement>
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{
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ConcurrentDictionary<TKey, IEnumerable<TElement>> dictionary;
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private class AddSlot
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{
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TElement element;
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internal AddSlot (TElement element)
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{
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this.element = element;
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}
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internal IEnumerable<TElement> AddMethod (TKey key)
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{
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List<TElement> list = new List<TElement> ();
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list.Add (element);
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return list;
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}
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internal IEnumerable<TElement> UpdateMethod (TKey key, IEnumerable<TElement> old)
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{
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ICollection<TElement> coll = (ICollection<TElement>)old;
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coll.Add (element);
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return coll;
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}
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}
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internal ConcurrentLookup (IEqualityComparer<TKey> comparer)
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{
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this.dictionary = new ConcurrentDictionary<TKey, IEnumerable<TElement>> (comparer);
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}
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internal void Add (TKey key, TElement element)
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{
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AddSlot slot = new AddSlot (element);
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dictionary.AddOrUpdate (key, slot.AddMethod, slot.UpdateMethod);
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}
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public bool Contains (TKey key)
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{
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return dictionary.ContainsKey (key);
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}
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public IEnumerable<TElement> this[TKey key] {
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get {
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return dictionary[key];
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}
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}
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public int Count {
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get {
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return dictionary.Count;
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}
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}
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public IList<TKey> Keys {
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get {
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return (IList<TKey>)dictionary.Keys;
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}
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}
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IEnumerator IEnumerable.GetEnumerator ()
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{
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return (IEnumerator)GetEnumeratorInternal ();
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}
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IEnumerator<IGrouping<TKey, TElement>> IEnumerable<IGrouping<TKey, TElement>>.GetEnumerator ()
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{
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return GetEnumeratorInternal ();
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}
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IEnumerator<IGrouping<TKey, TElement>> GetEnumeratorInternal ()
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{
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return (IEnumerator<System.Linq.IGrouping<TKey,TElement>>) dictionary.Select ((pair) => new ConcurrentGrouping<TKey, TElement> (pair.Key, pair.Value)).GetEnumerator ();
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}
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}
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}
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#endif
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