mcs/class/System/System.Net/GlobalProxySelection.cs

   1 //\r
   2 // System.Net.GlobalProxySelection\r
   3 //\r
   4 // Author:\r
   5 //   Lawrence Pit (loz@cable.a2000.nl)\r
   6 //\r
   7 \r
   8 using System;\r
   9 using System.Collections;\r
  10 using System.Configuration;\r
  11 using System.IO;\r
  12 using System.Runtime.Serialization;\r
  13 \r
  14 namespace System.Net \r
  15 {\r
  16         public class GlobalProxySelection\r
  17         {\r
  18                 private static IWebProxy proxy;\r
  19                 \r
  20                 // Constructors\r
  21                 public GlobalProxySelection() { }\r
  22                 \r
  23                 // Properties\r
  24                 \r
  25                 static IWebProxy GetProxy ()\r
  26                 {\r
  27                         if (proxy != null)\r
  28                                 return proxy;\r
  29 \r
  30                         lock (typeof (GlobalProxySelection)) {\r
  31                                 if (proxy != null)\r
  32                                         return proxy;\r
  33 \r
  34                                 object p = ConfigurationSettings.GetConfig ("system.net/defaultProxy");\r
  35                                 if (p == null)\r
  36                                         p = new EmptyWebProxy ();\r
  37 \r
  38                                 proxy = (IWebProxy) p;\r
  39                         }\r
  40 \r
  41                         return proxy;\r
  42                 }\r
  43                 \r
  44                 public static IWebProxy Select {\r
  45                         get { return GetProxy (); }\r
  46                         set {\r
  47                                 if (value == null)\r
  48                                         throw new ArgumentNullException ("GlobalProxySelection.Select",\r
  49                                                         "null IWebProxy not allowed. Use GetEmptyWebProxy ()");\r
  50 \r
  51                                 lock (typeof (GlobalProxySelection))\r
  52                                         proxy = value; \r
  53                         }\r
  54                 }\r
  55                 \r
  56                 // Methods\r
  57                 \r
  58                 public static IWebProxy GetEmptyWebProxy()\r
  59                 {\r
  60                         // must return a new one each time, as the credentials\r
  61                         // can be set\r
  62                         return new EmptyWebProxy ();    \r
  63                 }\r
  64                 \r
  65                 // Internal Classes\r
  66                 \r
  67                 internal class EmptyWebProxy : IWebProxy {\r
  68                         private ICredentials credentials = null;\r
  69                         \r
  70                         internal EmptyWebProxy () { }\r
  71                         \r
  72                         public ICredentials Credentials {\r
  73                                 get { return credentials; } \r
  74                                 set { credentials = value; }\r
  75                         }\r
  76 \r
  77                         public Uri GetProxy (Uri destination)\r
  78                         {\r
  79                                 return destination;\r
  80                         }\r
  81 \r
  82                         public bool IsBypassed (Uri host)\r
  83                         {\r
  84                                 return true; // pass directly to host\r
  85                         }\r
  86                 }\r
  87         }               \r
  88 }\r