mcs/class/corlib/System.Security.Permissions/GacIdentityPermission.cs

   1 //
   2 // System.Security.Permissions.GacIdentityPermission
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   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
  29 #if NET_2_0
  30
  31 using System.Globalization;
  32
  33 namespace System.Security.Permissions {
  34
  35         [Serializable]
  36         public sealed class GacIdentityPermission : CodeAccessPermission, IBuiltInPermission {
  37
  38                 private const int version = 1;
  39
  40                 public GacIdentityPermission ()
  41                 {
  42                 }
  43
  44                 public GacIdentityPermission (PermissionState state)
  45                 {
  46                         // false == do not allow Unrestricted for Identity Permissions
  47                         CheckPermissionState (state, false);
  48                 }
  49
  50                 public override IPermission Copy ()
  51                 {
  52                         return (IPermission) new GacIdentityPermission ();
  53                 }
  54
  55                 public override IPermission Intersect (IPermission target)
  56                 {
  57                         GacIdentityPermission gip = Cast (target);
  58                         if (gip == null)
  59                                 return null;
  60
  61                         return Copy ();
  62                 }
  63
  64                 public override bool IsSubsetOf (IPermission target)
  65                 {
  66                         GacIdentityPermission gip = Cast (target);
  67                         return (gip != null);
  68                 }
  69
  70                 public override IPermission Union (IPermission target)
  71                 {
  72                         GacIdentityPermission gip = Cast (target);
  73                         return Copy ();
  74                 }
  75
  76                 public override void FromXml (SecurityElement esd)
  77                 {
  78                         // General validation in CodeAccessPermission
  79                         CheckSecurityElement (esd, "esd", version, version);
  80                         // Note: we do not (yet) care about the return value
  81                         // as we only accept version 1 (min/max values)
  82                 }
  83
  84                 public override SecurityElement ToXml ()
  85                 {
  86                         SecurityElement se = Element (version);
  87                         return se;
  88                 }
  89
  90                 // IBuildInPermission
  91
  92                 int IBuiltInPermission.GetTokenIndex ()
  93                 {
  94                         return (int) BuiltInToken.GacIdentity;
  95                 }
  96
  97                 // helpers
  98
  99                 private GacIdentityPermission Cast (IPermission target)
 100                 {
 101                         if (target == null)
 102                                 return null;
 103
 104                         GacIdentityPermission uip = (target as GacIdentityPermission);
 105                         if (uip == null) {
 106                                 ThrowInvalidPermission (target, typeof (GacIdentityPermission));
 107                         }
 108
 109                         return uip;
 110                 }
 111         }
 112 }
 113
 114 #endif