mcs/class/System.Web.Routing/System.Web.Routing/RouteCollection.cs

   1 //
   2 // RouteCollection.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2008 Novell Inc. http://novell.com
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30 using System;
  31 using System.Collections;
  32 using System.Collections.Generic;
  33 using System.Collections.ObjectModel;
  34 using System.IO;
  35 using System.Runtime.CompilerServices;
  36 using System.Security.Permissions;
  37 using System.Web;
  38 using System.Web.Hosting;
  39
  40 namespace System.Web.Routing
  41 {
  42 #if NET_4_0
  43         [TypeForwardedFrom ("System.Web.Routing, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
  44 #endif
  45         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  46         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  47         public class RouteCollection : Collection<RouteBase>
  48         {
  49                 class Lock : IDisposable
  50                 {
  51                         RouteCollection owner;
  52                         bool read;
  53
  54                         public Lock (RouteCollection owner, bool read)
  55                         {
  56                                 this.owner = owner;
  57                                 this.read = read;
  58                         }
  59
  60                         public void Dispose ()
  61                         {
  62                                 //if (read)
  63                                 //      owner.read_lock = null;
  64                                 //else
  65                                 //      owner_write_lock = null;
  66                         }
  67                 }
  68
  69                 public RouteCollection ()
  70                         : this (null)
  71                 {
  72                 }
  73
  74                 public RouteCollection (VirtualPathProvider virtualPathProvider)
  75                 {
  76                         // null argument is allowed
  77                         provider = virtualPathProvider;
  78
  79                         read_lock = new Lock (this, true);
  80                         write_lock = new Lock (this, false);
  81                 }
  82
  83                 VirtualPathProvider provider;
  84                 Dictionary<string,RouteBase> d = new Dictionary<string,RouteBase> ();
  85
  86                 Lock read_lock, write_lock;
  87
  88                 public RouteBase this [string name] {
  89                         get {
  90                                 foreach (var p in d)
  91                                         if (p.Key == name)
  92                                                 return p.Value;
  93                                 return null;
  94                         }
  95                 }
  96
  97                 public bool RouteExistingFiles { get; set; }
  98
  99                 public void Add (string name, RouteBase item)
 100                 {
 101                         lock (GetWriteLock ()) {
 102                                 base.Add (item);
 103                                 if (!String.IsNullOrEmpty (name))
 104                                         d.Add (name, item);
 105                         }
 106                 }
 107
 108                 protected override void ClearItems ()
 109                 {
 110                         lock (GetWriteLock ())
 111                                 base.ClearItems ();
 112                 }
 113
 114                 public IDisposable GetReadLock ()
 115                 {
 116                         return read_lock;
 117                 }
 118
 119                 public RouteData GetRouteData (HttpContextBase httpContext)
 120                 {
 121                         if (httpContext == null)
 122                                 throw new ArgumentNullException ("httpContext");
 123
 124                         if (!RouteExistingFiles) {
 125                                 var path = httpContext.Request.AppRelativeCurrentExecutionFilePath;
 126                                 VirtualPathProvider vpp = HostingEnvironment.VirtualPathProvider;
 127                                 if (path != "~/" && vpp != null && (vpp.FileExists (path) || vpp.DirectoryExists (path)))
 128                                         return null;
 129                         }
 130
 131                         if (Count == 0)
 132                                 return null;
 133
 134                         foreach (RouteBase rb in this) {
 135                                 var rd = rb.GetRouteData (httpContext);
 136                                 if (rd != null)
 137                                         return rd;
 138                         }
 139
 140                         return null;
 141                 }
 142
 143                 public VirtualPathData GetVirtualPath (RequestContext requestContext, RouteValueDictionary values)
 144                 {
 145                         return GetVirtualPath (requestContext, null, values);
 146                 }
 147
 148                 public VirtualPathData GetVirtualPath (RequestContext requestContext, string name, RouteValueDictionary values)
 149                 {
 150                         if (requestContext == null)
 151                                 throw new ArgumentNullException ("httpContext");
 152
 153                         if (Count == 0)
 154                                 return null;
 155
 156                         VirtualPathData vp = null;
 157                         if (!String.IsNullOrEmpty (name)) {
 158                                 RouteBase rb = this [name];
 159                                 if (rb != null)
 160                                         vp = rb.GetVirtualPath (requestContext, values);
 161                         } else {
 162                                 foreach (RouteBase rb in this) {
 163                                         vp = rb.GetVirtualPath (requestContext, values);
 164                                         if (vp != null)
 165                                                 break;
 166                                 }
 167                         }
 168
 169                         if (vp != null) {
 170                                 var pathWithApp = String.Concat (requestContext.HttpContext.Request.ApplicationPath, "/", vp.VirtualPath);
 171                                 vp.VirtualPath = requestContext.HttpContext.Response.ApplyAppPathModifier (pathWithApp);
 172                                 return vp;
 173                         }
 174
 175                         return null;
 176                 }
 177
 178                 public IDisposable GetWriteLock ()
 179                 {
 180                         return write_lock;
 181                 }
 182
 183                 protected override void InsertItem (int index, RouteBase item)
 184                 {
 185                         // FIXME: what happens wrt its name?
 186                         lock (GetWriteLock ())
 187                                 base.InsertItem (index, item);
 188                 }
 189
 190                 protected override void RemoveItem (int index)
 191                 {
 192                         // FIXME: what happens wrt its name?
 193                         lock (GetWriteLock ()) {
 194                                 string k = GetKey (index);
 195                                 base.RemoveItem (index);
 196                                 if (k != null)
 197                                         d.Remove (k);
 198                         }
 199                 }
 200
 201                 protected override void SetItem (int index, RouteBase item)
 202                 {
 203                         // FIXME: what happens wrt its name?
 204                         lock (GetWriteLock ()) {
 205                                 string k = GetKey (index);
 206                                 base.SetItem (index, item);
 207                                 if (k != null)
 208                                         d.Remove (k);
 209                         }
 210                 }
 211
 212                 string GetKey (int index)
 213                 {
 214                         var item = this [index];
 215                         foreach (var p in d)
 216                                 if (p.Value == item)
 217                                         return p.Key;
 218                         return null;
 219                 }
 220         }
 221 }