mcs/class/corlib/System.Security.Policy/GacMembershipCondition.cs

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