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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;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc.Resources;
using System.Web.Routing;
public class DefaultControllerFactory : IControllerFactory {
private IBuildManager _buildManager;
private ControllerBuilder _controllerBuilder;
private ControllerTypeCache _instanceControllerTypeCache;
private static ControllerTypeCache _staticControllerTypeCache = new ControllerTypeCache();
internal IBuildManager BuildManager {
get {
if (_buildManager == null) {
_buildManager = new BuildManagerWrapper();
}
return _buildManager;
}
set {
_buildManager = value;
}
}
internal ControllerBuilder ControllerBuilder {
get {
return _controllerBuilder ?? ControllerBuilder.Current;
}
set {
_controllerBuilder = value;
}
}
internal ControllerTypeCache ControllerTypeCache {
get {
return _instanceControllerTypeCache ?? _staticControllerTypeCache;
}
set {
_instanceControllerTypeCache = value;
}
}
internal static InvalidOperationException CreateAmbiguousControllerException(RouteBase route, string controllerName, ICollection<Type> matchingTypes) {
// we need to generate an exception containing all the controller types
StringBuilder typeList = new StringBuilder();
foreach (Type matchedType in matchingTypes) {
typeList.AppendLine();
typeList.Append(matchedType.FullName);
}
string errorText;
Route castRoute = route as Route;
if (castRoute != null) {
errorText = String.Format(CultureInfo.CurrentUICulture, MvcResources.DefaultControllerFactory_ControllerNameAmbiguous_WithRouteUrl,
controllerName, castRoute.Url, typeList);
}
else {
errorText = String.Format(CultureInfo.CurrentUICulture, MvcResources.DefaultControllerFactory_ControllerNameAmbiguous_WithoutRouteUrl,
controllerName, typeList);
}
return new InvalidOperationException(errorText);
}
public virtual IController CreateController(RequestContext requestContext, string controllerName) {
if (requestContext == null) {
throw new ArgumentNullException("requestContext");
}
if (String.IsNullOrEmpty(controllerName)) {
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "controllerName");
}
Type controllerType = GetControllerType(requestContext, controllerName);
IController controller = GetControllerInstance(requestContext, controllerType);
return controller;
}
protected internal virtual IController GetControllerInstance(RequestContext requestContext, Type controllerType) {
if (controllerType == null) {
throw new HttpException(404,
String.Format(
CultureInfo.CurrentUICulture,
MvcResources.DefaultControllerFactory_NoControllerFound,
requestContext.HttpContext.Request.Path));
}
if (!typeof(IController).IsAssignableFrom(controllerType)) {
throw new ArgumentException(
String.Format(
CultureInfo.CurrentUICulture,
MvcResources.DefaultControllerFactory_TypeDoesNotSubclassControllerBase,
controllerType),
"controllerType");
}
try {
return (IController)Activator.CreateInstance(controllerType);
}
catch (Exception ex) {
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentUICulture,
MvcResources.DefaultControllerFactory_ErrorCreatingController,
controllerType),
ex);
}
}
protected internal virtual Type GetControllerType(RequestContext requestContext, string controllerName) {
if (String.IsNullOrEmpty(controllerName)) {
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "controllerName");
}
// first search in the current route's namespace collection
object routeNamespacesObj;
Type match;
if (requestContext != null && requestContext.RouteData.DataTokens.TryGetValue("Namespaces", out routeNamespacesObj)) {
IEnumerable<string> routeNamespaces = routeNamespacesObj as IEnumerable<string>;
if (routeNamespaces != null && routeNamespaces.Any()) {
HashSet<string> nsHash = new HashSet<string>(routeNamespaces, StringComparer.OrdinalIgnoreCase);
match = GetControllerTypeWithinNamespaces(requestContext.RouteData.Route, controllerName, nsHash);
// the UseNamespaceFallback key might not exist, in which case its value is implicitly "true"
if (match != null || false.Equals(requestContext.RouteData.DataTokens["UseNamespaceFallback"])) {
// got a match or the route requested we stop looking
return match;
}
}
}
// then search in the application's default namespace collection
if (ControllerBuilder.DefaultNamespaces.Count > 0) {
HashSet<string> nsDefaults = new HashSet<string>(ControllerBuilder.DefaultNamespaces, StringComparer.OrdinalIgnoreCase);
match = GetControllerTypeWithinNamespaces(requestContext.RouteData.Route, controllerName, nsDefaults);
if (match != null) {
return match;
}
}
// if all else fails, search every namespace
return GetControllerTypeWithinNamespaces(requestContext.RouteData.Route, controllerName, null /* namespaces */);
}
private Type GetControllerTypeWithinNamespaces(RouteBase route, string controllerName, HashSet<string> namespaces) {
// Once the master list of controllers has been created we can quickly index into it
ControllerTypeCache.EnsureInitialized(BuildManager);
ICollection<Type> matchingTypes = ControllerTypeCache.GetControllerTypes(controllerName, namespaces);
switch (matchingTypes.Count) {
case 0:
// no matching types
return null;
case 1:
// single matching type
return matchingTypes.First();
default:
// multiple matching types
throw CreateAmbiguousControllerException(route, controllerName, matchingTypes);
}
}
public virtual void ReleaseController(IController controller) {
IDisposable disposable = controller as IDisposable;
if (disposable != null) {
disposable.Dispose();
}
}
}
}
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