76 lines
2.6 KiB
C#
76 lines
2.6 KiB
C#
#region License
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// <copyright file="ReflectionCache.cs" company="Giacomo Stelluti Scala">
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// Copyright 2015-2013 Giacomo Stelluti Scala
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// </copyright>
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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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#endregion
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#region Using Directives
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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#endregion
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namespace CommandLine.Infrastructure
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{
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internal sealed class ReflectionCache
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{
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private static readonly ReflectionCache Singleton;
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private readonly IDictionary<Pair<Type, object>, WeakReference> _cache;
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[SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline", Justification = "Singleton, by design")]
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static ReflectionCache()
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{
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Singleton = new ReflectionCache();
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}
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private ReflectionCache()
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{
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_cache = new Dictionary<Pair<Type, object>, WeakReference>();
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}
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public static ReflectionCache Instance
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{
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get { return Singleton; }
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}
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public object this[Pair<Type, object> key]
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{
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get
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{
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if (key == null)
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{
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throw new ArgumentNullException("key");
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}
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return _cache.ContainsKey(key) ? _cache[key].Target : null;
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}
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set
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{
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if (key == null)
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{
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throw new ArgumentNullException("key");
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}
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_cache[key] = new WeakReference(value);
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}
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}
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}
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}
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