System.Security.Policy/GacMembershipCondition.cs

   1 //
   2 // System.Security.Policy.GacMembershipCondition
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2004-2005 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.Collections;
  32 using System.Security.Permissions;
  33 using System.Runtime.InteropServices;
  34
  35 namespace System.Security.Policy {
  36
  37         [Serializable]
  38 #if NET_2_0
  39         [ComVisible (true)]
  40 #endif
  41         public sealed class GacMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  42
  43                 private readonly int version = 1;
  44
  45                 public GacMembershipCondition ()
  46                 {
  47                 }
  48
  49                 public bool Check (Evidence evidence)
  50                 {
  51                         if (evidence == null)
  52                                 return false;
  53
  54                         // true only if Gac is in host-supplied evidences
  55                         IEnumerator e = evidence.GetHostEnumerator ();
  56                         while (e.MoveNext ()) {
  57                                 if (e.Current is GacInstalled)
  58                                         return true;
  59                         }
  60                         return false;
  61                 }
  62
  63                 public IMembershipCondition Copy ()
  64                 {
  65                         return new GacMembershipCondition ();
  66                 }
  67
  68                 public override bool Equals (object o)
  69                 {
  70                         if (o == null)
  71                                 return false;
  72                         return (o is GacMembershipCondition);
  73                 }
  74
  75                 public void FromXml (SecurityElement element)
  76                 {
  77                         FromXml (element, null);
  78                 }
  79
  80                 public void FromXml (SecurityElement element, PolicyLevel level)
  81                 {
  82                         MembershipConditionHelper.CheckSecurityElement (element, "element", version, version);
  83                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
  84                 }
  85
  86                 public override int GetHashCode ()
  87                 {
  88                         return 0; // always the same
  89                 }
  90
  91                 // LAMESPEC: "Gac" is documented - but Fx 2.0 beta 1 returns "GAC"
  92                 public override string ToString ()
  93                 {
  94                         return "GAC";
  95                 }
  96
  97                 public SecurityElement ToXml ()
  98                 {
  99                         return ToXml (null);
 100                 }
 101
 102                 public SecurityElement ToXml (PolicyLevel level)
 103                 {
 104                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 105                         SecurityElement se = MembershipConditionHelper.Element (typeof (GacMembershipCondition), version);
 106                         // nothing to add
 107                         return se;
 108                 }
 109         }
 110 }
 111
 112 #endif