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using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Web.Mvc.Properties;
namespace System.Web.Mvc
{
public abstract class ActionDescriptor : ICustomAttributeProvider, IUniquelyIdentifiable
{
private static readonly ActionMethodDispatcherCache _staticDispatcherCache = new ActionMethodDispatcherCache();
private static readonly ActionSelector[] _emptySelectors = new ActionSelector[0];
private readonly Lazy<string> _uniqueId;
private ActionMethodDispatcherCache _instanceDispatcherCache;
protected ActionDescriptor()
{
_uniqueId = new Lazy<string>(CreateUniqueId);
}
public abstract string ActionName { get; }
public abstract ControllerDescriptor ControllerDescriptor { get; }
internal ActionMethodDispatcherCache DispatcherCache
{
get
{
if (_instanceDispatcherCache == null)
{
_instanceDispatcherCache = _staticDispatcherCache;
}
return _instanceDispatcherCache;
}
set { _instanceDispatcherCache = value; }
}
[SuppressMessage("Microsoft.Security", "CA2119:SealMethodsThatSatisfyPrivateInterfaces", Justification = "This is overridden elsewhere in System.Web.Mvc")]
public virtual string UniqueId
{
get { return _uniqueId.Value; }
}
private string CreateUniqueId()
{
return DescriptorUtil.CreateUniqueId(GetType(), ControllerDescriptor, ActionName);
}
public abstract object Execute(ControllerContext controllerContext, IDictionary<string, object> parameters);
internal static object ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary<string, object> parameters, MethodInfo methodInfo)
{
object value;
if (!parameters.TryGetValue(parameterInfo.Name, out value))
{
// the key should always be present, even if the parameter value is null
string message = String.Format(CultureInfo.CurrentCulture, MvcResources.ReflectedActionDescriptor_ParameterNotInDictionary,
parameterInfo.Name, parameterInfo.ParameterType, methodInfo, methodInfo.DeclaringType);
throw new ArgumentException(message, "parameters");
}
if (value == null && !TypeHelpers.TypeAllowsNullValue(parameterInfo.ParameterType))
{
// tried to pass a null value for a non-nullable parameter type
string message = String.Format(CultureInfo.CurrentCulture, MvcResources.ReflectedActionDescriptor_ParameterCannotBeNull,
parameterInfo.Name, parameterInfo.ParameterType, methodInfo, methodInfo.DeclaringType);
throw new ArgumentException(message, "parameters");
}
if (value != null && !parameterInfo.ParameterType.IsInstanceOfType(value))
{
// value was supplied but is not of the proper type
string message = String.Format(CultureInfo.CurrentCulture, MvcResources.ReflectedActionDescriptor_ParameterValueHasWrongType,
parameterInfo.Name, methodInfo, methodInfo.DeclaringType, value.GetType(), parameterInfo.ParameterType);
throw new ArgumentException(message, "parameters");
}
return value;
}
internal static object ExtractParameterOrDefaultFromDictionary(ParameterInfo parameterInfo, IDictionary<string, object> parameters)
{
Type parameterType = parameterInfo.ParameterType;
object value;
parameters.TryGetValue(parameterInfo.Name, out value);
// if wrong type, replace with default instance
if (parameterType.IsInstanceOfType(value))
{
return value;
}
else
{
object defaultValue;
if (ParameterInfoUtil.TryGetDefaultValue(parameterInfo, out defaultValue))
{
return defaultValue;
}
else
{
return TypeHelpers.GetDefaultValue(parameterType);
}
}
}
public virtual object[] GetCustomAttributes(bool inherit)
{
return GetCustomAttributes(typeof(object), inherit);
}
public virtual object[] GetCustomAttributes(Type attributeType, bool inherit)
{
if (attributeType == null)
{
throw new ArgumentNullException("attributeType");
}
return (object[])Array.CreateInstance(attributeType, 0);
}
public virtual IEnumerable<FilterAttribute> GetFilterAttributes(bool useCache)
{
return GetCustomAttributes(typeof(FilterAttribute), inherit: true).Cast<FilterAttribute>();
}
[EditorBrowsable(EditorBrowsableState.Never)]
[Obsolete("Please call System.Web.Mvc.FilterProviders.Providers.GetFilters() now.", true)]
public virtual FilterInfo GetFilters()
{
return new FilterInfo();
}
public abstract ParameterDescriptor[] GetParameters();
[SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate", Justification = "This method may perform non-trivial work.")]
public virtual ICollection<ActionSelector> GetSelectors()
{
return _emptySelectors;
}
public virtual bool IsDefined(Type attributeType, bool inherit)
{
if (attributeType == null)
{
throw new ArgumentNullException("attributeType");
}
return false;
}
internal static string VerifyActionMethodIsCallable(MethodInfo methodInfo)
{
// we can't call static methods
if (methodInfo.IsStatic)
{
return String.Format(CultureInfo.CurrentCulture,
MvcResources.ReflectedActionDescriptor_CannotCallStaticMethod,
methodInfo,
methodInfo.ReflectedType.FullName);
}
// we can't call instance methods where the 'this' parameter is a type other than ControllerBase
if (!typeof(ControllerBase).IsAssignableFrom(methodInfo.ReflectedType))
{
return String.Format(CultureInfo.CurrentCulture, MvcResources.ReflectedActionDescriptor_CannotCallInstanceMethodOnNonControllerType,
methodInfo, methodInfo.ReflectedType.FullName);
}
// we can't call methods with open generic type parameters
if (methodInfo.ContainsGenericParameters)
{
return String.Format(CultureInfo.CurrentCulture, MvcResources.ReflectedActionDescriptor_CannotCallOpenGenericMethods,
methodInfo, methodInfo.ReflectedType.FullName);
}
// we can't call methods with ref/out parameters
ParameterInfo[] parameterInfos = methodInfo.GetParameters();
foreach (ParameterInfo parameterInfo in parameterInfos)
{
if (parameterInfo.IsOut || parameterInfo.ParameterType.IsByRef)
{
return String.Format(CultureInfo.CurrentCulture, MvcResources.ReflectedActionDescriptor_CannotCallMethodsWithOutOrRefParameters,
methodInfo, methodInfo.ReflectedType.FullName, parameterInfo);
}
}
// we can call this method
return null;
}
}
}
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