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CustomAttributes.cs
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32 lines (27 loc) · 1.32 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Concurrent;
using System.Reflection;
using System.Runtime.CompilerServices;
using Microsoft.ClearScript.Util;
namespace Microsoft.ClearScript
{
internal static partial class CustomAttributes
{
private static readonly ConcurrentDictionary<(ICustomAttributeProvider, Type), object> keyCache = new ConcurrentDictionary<(ICustomAttributeProvider, Type), object>();
private static readonly ConditionalWeakTable<object, object> attributeCache = new ConditionalWeakTable<object, object>();
public static T[] GetOrLoad<T>(ICustomAttributeProvider resource, bool inherit) where T : Attribute
{
return (T[])attributeCache.GetValue(GetKey<T>(resource), _ => HostSettings.CustomAttributeLoader.LoadCustomAttributes<T>(resource, inherit) ?? ArrayHelpers.GetEmptyArray<T>());
}
public static bool Has<T>(ICustomAttributeProvider resource, bool inherit) where T : Attribute
{
return GetOrLoad<T>(resource, inherit).Length > 0;
}
private static object GetKey<T>(ICustomAttributeProvider resource) where T : Attribute
{
return keyCache.GetOrAdd((resource, typeof(T)), _ => new object());
}
}
}