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using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Reflection;
namespace System.Web.Mvc
{
internal static class ReflectedAttributeCache
{
private static readonly ConcurrentDictionary<MethodInfo, ReadOnlyCollection<ActionMethodSelectorAttribute>> _actionMethodSelectorAttributeCache = new ConcurrentDictionary<MethodInfo, ReadOnlyCollection<ActionMethodSelectorAttribute>>();
private static readonly ConcurrentDictionary<MethodInfo, ReadOnlyCollection<ActionNameSelectorAttribute>> _actionNameSelectorAttributeCache = new ConcurrentDictionary<MethodInfo, ReadOnlyCollection<ActionNameSelectorAttribute>>();
private static readonly ConcurrentDictionary<MethodInfo, ReadOnlyCollection<FilterAttribute>> _methodFilterAttributeCache = new ConcurrentDictionary<MethodInfo, ReadOnlyCollection<FilterAttribute>>();
private static readonly ConcurrentDictionary<Type, ReadOnlyCollection<FilterAttribute>> _typeFilterAttributeCache = new ConcurrentDictionary<Type, ReadOnlyCollection<FilterAttribute>>();
public static ICollection<FilterAttribute> GetTypeFilterAttributes(Type type)
{
return GetAttributes(_typeFilterAttributeCache, type);
}
public static ICollection<FilterAttribute> GetMethodFilterAttributes(MethodInfo methodInfo)
{
return GetAttributes(_methodFilterAttributeCache, methodInfo);
}
public static ICollection<ActionMethodSelectorAttribute> GetActionMethodSelectorAttributes(MethodInfo methodInfo)
{
return GetAttributes(_actionMethodSelectorAttributeCache, methodInfo);
}
public static ICollection<ActionNameSelectorAttribute> GetActionNameSelectorAttributes(MethodInfo methodInfo)
{
return GetAttributes(_actionNameSelectorAttributeCache, methodInfo);
}
private static ReadOnlyCollection<TAttribute> GetAttributes<TMemberInfo, TAttribute>(ConcurrentDictionary<TMemberInfo, ReadOnlyCollection<TAttribute>> lookup, TMemberInfo memberInfo)
where TAttribute : Attribute
where TMemberInfo : MemberInfo
{
Debug.Assert(memberInfo != null);
Debug.Assert(lookup != null);
return lookup.GetOrAdd(memberInfo, mi => new ReadOnlyCollection<TAttribute>((TAttribute[])memberInfo.GetCustomAttributes(typeof(TAttribute), inherit: true)));
}
}
}
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