mcs/class/System.Web/System.Web.Compilation/DefaultResourceProvider.cs

   1 // DefaultResourceProvider.cs
   2 //
   3 // Authors:
   4 //      Marek Habersack (mhabersack@novell.com)
   5 //
   6 // (C) 2009 Novell, Inc (http://novell.com)
   7
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 #if NET_2_0
  29 using System;
  30 using System.Collections.Generic;
  31 using System.Globalization;
  32 using System.IO;
  33 using System.Resources;
  34 using System.Reflection;
  35 using System.Web;
  36
  37 namespace System.Web.Compilation
  38 {
  39         sealed class DefaultResourceProvider : IResourceProvider
  40         {
  41                 sealed class ResourceManagerCacheKey
  42                 {
  43                         readonly string _name;
  44                         readonly Assembly _asm;
  45
  46                         public ResourceManagerCacheKey (string name, Assembly asm)
  47                         {
  48                                 _name = name;
  49                                 _asm = asm;
  50                         }
  51
  52                         public override bool Equals (object obj)
  53                         {
  54                                 if (!(obj is ResourceManagerCacheKey))
  55                                         return false;
  56                                 ResourceManagerCacheKey key = (ResourceManagerCacheKey) obj;
  57                                 return key._asm == _asm && _name.Equals (key._name, StringComparison.Ordinal);
  58                         }
  59
  60                         public override int GetHashCode ()
  61                         {
  62                                 return _name.GetHashCode () + _asm.GetHashCode ();
  63                         }
  64                 }
  65
  66                 [ThreadStatic]
  67                 static Dictionary <ResourceManagerCacheKey, ResourceManager> resourceManagerCache;
  68
  69                 string resource;
  70                 bool isGlobal;
  71
  72                 public IResourceReader ResourceReader {
  73                         get {
  74                                 Assembly asm;
  75                                 string path;
  76
  77                                 if (isGlobal) {
  78                                         asm = HttpContext.AppGlobalResourcesAssembly;
  79                                         path = resource;
  80                                 } else {
  81                                         asm = GetLocalResourcesAssembly ();
  82                                         path = Path.GetFileName (resource);
  83
  84                                         if (String.IsNullOrEmpty (path))
  85                                                 return null;
  86
  87                                         path += ".resources";
  88                                 }
  89
  90                                 if (asm == null)
  91                                         return null;
  92
  93                                 Stream ms = asm.GetManifestResourceStream (path);
  94                                 if (ms == null)
  95                                         return null;
  96
  97                                 return new ResourceReader (ms);
  98                         }
  99                 }
 100
 101                 public DefaultResourceProvider (string resource, bool isGlobal)
 102                 {
 103                         if (String.IsNullOrEmpty (resource))
 104                                 throw new ArgumentNullException ("resource");
 105
 106                         this.resource = resource;
 107                         this.isGlobal = isGlobal;
 108                 }
 109
 110                 public object GetObject (string resourceKey, CultureInfo culture)
 111                 {
 112                         if (String.IsNullOrEmpty (resourceKey))
 113                                 return null;
 114
 115                         ResourceManager rm = GetResourceManager ();
 116                         if (rm == null)
 117                                 return null;
 118
 119                         return rm.GetObject (resourceKey, culture);
 120                 }
 121
 122                 Assembly GetLocalResourcesAssembly ()
 123                 {
 124                         string path;
 125                         Assembly asm;
 126
 127                         path = VirtualPathUtility.GetDirectory (resource);
 128                         asm = AppResourcesCompiler.GetCachedLocalResourcesAssembly (path);
 129                         if (asm == null) {
 130                                 AppResourcesCompiler ac = new AppResourcesCompiler (path);
 131                                 asm = ac.Compile ();
 132                                 if (asm == null)
 133                                         throw new MissingManifestResourceException ("A resource object was not found at the specified virtualPath.");
 134                         }
 135
 136                         return asm;
 137                 }
 138
 139                 ResourceManager GetResourceManager ()
 140                 {
 141                         string path;
 142                         Assembly asm;
 143
 144                         if (isGlobal) {
 145                                 asm = HttpContext.AppGlobalResourcesAssembly;
 146                                 path = resource;
 147                         } else {
 148                                 asm = GetLocalResourcesAssembly ();
 149                                 path = Path.GetFileName (resource);
 150
 151                                 if (String.IsNullOrEmpty (path))
 152                                         return null;
 153                         }
 154
 155                         if (asm == null)
 156                                 return null;
 157
 158                         ResourceManager rm;
 159                         try {
 160                                 if (resourceManagerCache == null)
 161                                         resourceManagerCache = new Dictionary <ResourceManagerCacheKey, ResourceManager> ();
 162
 163                                 ResourceManagerCacheKey key = new ResourceManagerCacheKey (path, asm);
 164                                 if (!resourceManagerCache.TryGetValue (key, out rm)) {
 165                                         rm = new ResourceManager (path, asm);
 166                                         rm.IgnoreCase = true;
 167                                         resourceManagerCache.Add (key, rm);
 168                                 }
 169
 170                                 return rm;
 171                         } catch (MissingManifestResourceException) {
 172                                 throw;
 173                         } catch (Exception ex) {
 174                                 throw new HttpException ("Failed to retrieve the specified global resource object.", ex);
 175                         }
 176                 }
 177         }
 178 }
 179 #endif