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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Reflection;
namespace System.Web.Mvc
{
internal static class ActionDescriptorHelper
{
public static ICollection<ActionSelector> GetSelectors(MethodInfo methodInfo)
{
ActionMethodSelectorAttribute[] attrs = (ActionMethodSelectorAttribute[])methodInfo.GetCustomAttributes(typeof(ActionMethodSelectorAttribute), inherit: true);
ActionSelector[] selectors = Array.ConvertAll(attrs, attr => (ActionSelector)(controllerContext => attr.IsValidForRequest(controllerContext, methodInfo)));
return selectors;
}
public static bool IsDefined(MemberInfo methodInfo, Type attributeType, bool inherit)
{
return methodInfo.IsDefined(attributeType, inherit);
}
public static object[] GetCustomAttributes(MemberInfo methodInfo, bool inherit)
{
return methodInfo.GetCustomAttributes(inherit);
}
public static object[] GetCustomAttributes(MemberInfo methodInfo, Type attributeType, bool inherit)
{
return methodInfo.GetCustomAttributes(attributeType, inherit);
}
public static ParameterDescriptor[] GetParameters(ActionDescriptor actionDescriptor, MethodInfo methodInfo, ref ParameterDescriptor[] parametersCache)
{
ParameterDescriptor[] parameters = LazilyFetchParametersCollection(actionDescriptor, methodInfo, ref parametersCache);
// need to clone array so that user modifications aren't accidentally stored
return (ParameterDescriptor[])parameters.Clone();
}
private static ParameterDescriptor[] LazilyFetchParametersCollection(ActionDescriptor actionDescriptor, MethodInfo methodInfo, ref ParameterDescriptor[] parametersCache)
{
return DescriptorUtil.LazilyFetchOrCreateDescriptors<ParameterInfo, ParameterDescriptor>(
cacheLocation: ref parametersCache,
initializer: methodInfo.GetParameters,
converter: parameterInfo => new ReflectedParameterDescriptor(parameterInfo, actionDescriptor));
}
}
}
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