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.Security.Permissions;
  36 using System.Web;
  37 using System.Web.Hosting;
  38
  39 namespace System.Web.Routing
  40 {
  41         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  42         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  43         public class RouteCollection : Collection<RouteBase>
  44         {
  45                 class Lock : IDisposable
  46                 {
  47                         RouteCollection owner;
  48                         bool read;
  49
  50                         public Lock (RouteCollection owner, bool read)
  51                         {
  52                                 this.owner = owner;
  53                                 this.read = read;
  54                         }
  55
  56                         public void Dispose ()
  57                         {
  58                                 //if (read)
  59                                 //      owner.read_lock = null;
  60                                 //else
  61                                 //      owner_write_lock = null;
  62                         }
  63                 }
  64
  65                 public RouteCollection ()
  66                         : this (null)
  67                 {
  68                 }
  69
  70                 public RouteCollection (VirtualPathProvider virtualPathProvider)
  71                 {
  72                         // null argument is allowed
  73                         provider = virtualPathProvider;
  74
  75                         read_lock = new Lock (this, true);
  76                         write_lock = new Lock (this, false);
  77                 }
  78
  79                 VirtualPathProvider provider;
  80                 Dictionary<string,RouteBase> d = new Dictionary<string,RouteBase> ();
  81
  82                 Lock read_lock, write_lock;
  83
  84                 public RouteBase this [string name] {
  85                         get {
  86                                 foreach (var p in d)
  87                                         if (p.Key == name)
  88                                                 return p.Value;
  89                                 return null;
  90                         }
  91                 }
  92
  93                 public bool RouteExistingFiles { get; set; }
  94
  95                 public void Add (string name, RouteBase item)
  96                 {
  97                         lock (GetWriteLock ()) {
  98                                 base.Add (item);
  99                                 if (!String.IsNullOrEmpty (name))
 100                                         d.Add (name, item);
 101                         }
 102                 }
 103
 104                 protected override void ClearItems ()
 105                 {
 106                         lock (GetWriteLock ())
 107                                 base.ClearItems ();
 108                 }
 109
 110                 public IDisposable GetReadLock ()
 111                 {
 112                         return read_lock;
 113                 }
 114
 115                 public RouteData GetRouteData (HttpContextBase httpContext)
 116                 {
 117                         if (httpContext == null)
 118                                 throw new ArgumentNullException ("httpContext");
 119
 120                         if (!RouteExistingFiles) {
 121                                 var path = httpContext.Request.AppRelativeCurrentExecutionFilePath;
 122                                 VirtualPathProvider vpp = HostingEnvironment.VirtualPathProvider;
 123                                 if (path != "~/" && vpp != null && (vpp.FileExists (path) || vpp.DirectoryExists (path)))
 124                                         return null;
 125                         }
 126
 127                         if (Count == 0)
 128                                 return null;
 129
 130                         foreach (RouteBase rb in this) {
 131                                 var rd = rb.GetRouteData (httpContext);
 132                                 if (rd != null)
 133                                         return rd;
 134                         }
 135
 136                         return null;
 137                 }
 138
 139                 public VirtualPathData GetVirtualPath (RequestContext requestContext, RouteValueDictionary values)
 140                 {
 141                         return GetVirtualPath (requestContext, null, values);
 142                 }
 143
 144                 public VirtualPathData GetVirtualPath (RequestContext requestContext, string name, RouteValueDictionary values)
 145                 {
 146                         if (requestContext == null)
 147                                 throw new ArgumentNullException ("httpContext");
 148
 149                         if (Count == 0)
 150                                 return null;
 151
 152                         VirtualPathData vp = null;
 153                         if (!String.IsNullOrEmpty (name)) {
 154                                 RouteBase rb = this [name];
 155                                 if (rb != null)
 156                                         vp = rb.GetVirtualPath (requestContext, values);
 157                         } else {
 158                                 foreach (RouteBase rb in this) {
 159                                         vp = rb.GetVirtualPath (requestContext, values);
 160                                         if (vp != null)
 161                                                 break;
 162                                 }
 163                         }
 164
 165                         if (vp != null) {
 166                                 var pathWithApp = String.Concat (requestContext.HttpContext.Request.ApplicationPath, "/", vp.VirtualPath);
 167                                 vp.VirtualPath = requestContext.HttpContext.Response.ApplyAppPathModifier (pathWithApp);
 168                                 return vp;
 169                         }
 170
 171                         return null;
 172                 }
 173
 174                 public IDisposable GetWriteLock ()
 175                 {
 176                         return write_lock;
 177                 }
 178
 179                 protected override void InsertItem (int index, RouteBase item)
 180                 {
 181                         // FIXME: what happens wrt its name?
 182                         lock (GetWriteLock ())
 183                                 base.InsertItem (index, item);
 184                 }
 185
 186                 protected override void RemoveItem (int index)
 187                 {
 188                         // FIXME: what happens wrt its name?
 189                         lock (GetWriteLock ()) {
 190                                 string k = GetKey (index);
 191                                 base.RemoveItem (index);
 192                                 if (k != null)
 193                                         d.Remove (k);
 194                         }
 195                 }
 196
 197                 protected override void SetItem (int index, RouteBase item)
 198                 {
 199                         // FIXME: what happens wrt its name?
 200                         lock (GetWriteLock ()) {
 201                                 string k = GetKey (index);
 202                                 base.SetItem (index, item);
 203                                 if (k != null)
 204                                         d.Remove (k);
 205                         }
 206                 }
 207
 208                 string GetKey (int index)
 209                 {
 210                         var item = this [index];
 211                         foreach (var p in d)
 212                                 if (p.Value == item)
 213                                         return p.Key;
 214                         return null;
 215                 }
 216         }
 217 }