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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
*
* You must not remove this notice, or any other, from this software.
*
* ***************************************************************************/
namespace System.Web.Mvc {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Web.Mvc.Resources;
public class ReflectedActionDescriptor : ActionDescriptor {
private readonly string _actionName;
private readonly ControllerDescriptor _controllerDescriptor;
private ParameterDescriptor[] _parametersCache;
public ReflectedActionDescriptor(MethodInfo methodInfo, string actionName, ControllerDescriptor controllerDescriptor)
: this(methodInfo, actionName, controllerDescriptor, true /* validateMethod */) {
}
internal ReflectedActionDescriptor(MethodInfo methodInfo, string actionName, ControllerDescriptor controllerDescriptor, bool validateMethod) {
if (methodInfo == null) {
throw new ArgumentNullException("methodInfo");
}
if (String.IsNullOrEmpty(actionName)) {
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "actionName");
}
if (controllerDescriptor == null) {
throw new ArgumentNullException("controllerDescriptor");
}
if (validateMethod) {
string failedMessage = VerifyActionMethodIsCallable(methodInfo);
if (failedMessage != null) {
throw new ArgumentException(failedMessage, "methodInfo");
}
}
MethodInfo = methodInfo;
_actionName = actionName;
_controllerDescriptor = controllerDescriptor;
}
public override string ActionName {
get {
return _actionName;
}
}
public override ControllerDescriptor ControllerDescriptor {
get {
return _controllerDescriptor;
}
}
public MethodInfo MethodInfo {
get;
private set;
}
public override object Execute(ControllerContext controllerContext, IDictionary<string, object> parameters) {
if (controllerContext == null) {
throw new ArgumentNullException("controllerContext");
}
if (parameters == null) {
throw new ArgumentNullException("parameters");
}
ParameterInfo[] parameterInfos = MethodInfo.GetParameters();
var rawParameterValues = from parameterInfo in parameterInfos
select ExtractParameterFromDictionary(parameterInfo, parameters, MethodInfo);
object[] parametersArray = rawParameterValues.ToArray();
ActionMethodDispatcher dispatcher = DispatcherCache.GetDispatcher(MethodInfo);
object actionReturnValue = dispatcher.Execute(controllerContext.Controller, parametersArray);
return actionReturnValue;
}
public override object[] GetCustomAttributes(bool inherit) {
return MethodInfo.GetCustomAttributes(inherit);
}
public override object[] GetCustomAttributes(Type attributeType, bool inherit) {
return MethodInfo.GetCustomAttributes(attributeType, inherit);
}
public override FilterInfo GetFilters() {
return GetFilters(MethodInfo);
}
public override ParameterDescriptor[] GetParameters() {
ParameterDescriptor[] parameters = LazilyFetchParametersCollection();
// need to clone array so that user modifications aren't accidentally stored
return (ParameterDescriptor[])parameters.Clone();
}
public override ICollection<ActionSelector> GetSelectors() {
ActionMethodSelectorAttribute[] attrs = (ActionMethodSelectorAttribute[])MethodInfo.GetCustomAttributes(typeof(ActionMethodSelectorAttribute), true /* inherit */);
ActionSelector[] selectors = Array.ConvertAll(attrs, attr => (ActionSelector)(controllerContext => attr.IsValidForRequest(controllerContext, MethodInfo)));
return selectors;
}
public override bool IsDefined(Type attributeType, bool inherit) {
return MethodInfo.IsDefined(attributeType, inherit);
}
private ParameterDescriptor[] LazilyFetchParametersCollection() {
return DescriptorUtil.LazilyFetchOrCreateDescriptors<ParameterInfo, ParameterDescriptor>(
ref _parametersCache /* cacheLocation */,
MethodInfo.GetParameters /* initializer */,
parameterInfo => new ReflectedParameterDescriptor(parameterInfo, this) /* converter */);
}
internal static ReflectedActionDescriptor TryCreateDescriptor(MethodInfo methodInfo, string name, ControllerDescriptor controllerDescriptor) {
ReflectedActionDescriptor descriptor = new ReflectedActionDescriptor(methodInfo, name, controllerDescriptor, false /* validateMethod */);
string failedMessage = VerifyActionMethodIsCallable(methodInfo);
return (failedMessage == null) ? descriptor : null;
}
}
}
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