mcs/class/System.Configuration/System.Configuration/ConfigurationPermission.cs

   1 //
   2 // System.Configuration.ConfigurationPermission.cs
   3 //
   4 // Author:
   5 //      Chris Toshok <toshok@ximian.com>
   6 //
   7 //
   8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 #if NET_2_0
  31
  32 using System.Security;
  33 using System.Security.Permissions;
  34
  35 namespace System.Configuration {
  36
  37         [Serializable]
  38         public sealed class ConfigurationPermission : CodeAccessPermission, IUnrestrictedPermission
  39         {
  40                 public ConfigurationPermission (PermissionState state)
  41                 {
  42                         unrestricted = (state == PermissionState.Unrestricted);
  43                 }
  44
  45                 public override IPermission Copy ()
  46                 {
  47                         return new ConfigurationPermission (unrestricted ? PermissionState.Unrestricted : PermissionState.None);
  48                 }
  49
  50                 public override void FromXml (SecurityElement securityElement)
  51                 {
  52                         if (securityElement == null)
  53                                 throw new ArgumentNullException ("securityElement");
  54
  55                         // LAMESPEC: it says to throw an ArgumentNullException in this case
  56                         if (securityElement.Tag != "IPermission")
  57                                 throw new ArgumentException ("securityElement");
  58
  59                         string unrestricted = securityElement.Attribute ("Unrestricted");
  60                         if (unrestricted != null) {
  61                                 this.unrestricted = (String.Compare (unrestricted, "true", StringComparison.InvariantCultureIgnoreCase) == 0);
  62                         }
  63                 }
  64
  65                 public override IPermission Intersect (IPermission target)
  66                 {
  67                         if (target == null)
  68                                 return null;
  69
  70                         ConfigurationPermission p = target as ConfigurationPermission;
  71                         if (p == null)
  72                                 throw new ArgumentException ("target");
  73
  74                         return new ConfigurationPermission (unrestricted && p.IsUnrestricted() ? PermissionState.Unrestricted : PermissionState.None);
  75                 }
  76
  77                 public override IPermission Union (IPermission target)
  78                 {
  79                         if (target == null)
  80                                 return Copy ();
  81
  82                         ConfigurationPermission p = target as ConfigurationPermission;
  83                         if (p == null)
  84                                 throw new ArgumentException ("target");
  85
  86                         return new ConfigurationPermission (unrestricted || p.IsUnrestricted() ? PermissionState.Unrestricted : PermissionState.None);
  87                 }
  88
  89                 public override bool IsSubsetOf (IPermission target)
  90                 {
  91                         if (target == null)
  92                                 return !unrestricted;
  93
  94                         ConfigurationPermission p = target as ConfigurationPermission;
  95                         if (p == null)
  96                                 throw new ArgumentException ("target");
  97
  98                         if (unrestricted)
  99                                 return p.IsUnrestricted();
 100                         else
 101                                 return true;
 102                 }
 103
 104                 public bool IsUnrestricted ()
 105                 {
 106                         return unrestricted;
 107                 }
 108
 109                 public override SecurityElement ToXml ()
 110                 {
 111                         SecurityElement root = new SecurityElement ("IPermission");
 112                         root.AddAttribute ("class", this.GetType().AssemblyQualifiedName);
 113                         root.AddAttribute ("version", "1");
 114                         if (unrestricted) {
 115                                 root.AddAttribute ("Unrestricted", "true");
 116                         }
 117                         return root;
 118                 }
 119
 120                 bool unrestricted;
 121         }
 122
 123 }
 124 #endif