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

   1 //\r
   2 // System.Security.Policy.PolicyStatement\r
   3 //\r
   4 // Authors:\r
   5 //      Dan Lewis (dihlewis@yahoo.co.uk)\r
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //\r
   8 // (C) 2002\r
   9 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30 \r
  31 using System.Runtime.InteropServices;
  32 using System.Security.Permissions;\r
  33 \r
  34 namespace System.Security.Policy {\r
  35 \r
  36         [Serializable]\r
  37         public sealed class PolicyStatement : ISecurityEncodable, ISecurityPolicyEncodable {
  38
  39                 private PermissionSet perms;\r
  40                 private PolicyStatementAttribute attrs;\r
  41 \r
  42                 public PolicyStatement (PermissionSet perms) :\r
  43                         this (perms, PolicyStatementAttribute.Nothing)\r
  44                 {\r
  45                 }\r
  46 \r
  47                 public PolicyStatement (PermissionSet perms, PolicyStatementAttribute attrs)
  48                 {\r
  49                         this.perms = perms;\r
  50                         this.attrs = attrs;\r
  51                 }\r
  52                 \r
  53                 public PermissionSet PermissionSet {\r
  54                         get { return perms; }\r
  55                         set { perms = value; }\r
  56                 }\r
  57                 \r
  58                 public PolicyStatementAttribute Attributes {\r
  59                         get { return attrs; }\r
  60                         set { attrs = value; }\r
  61                 }\r
  62 \r
  63                 public string AttributeString {\r
  64                         get {
  65                                 switch (attrs) {
  66                                         case PolicyStatementAttribute.Exclusive:
  67                                                 return "Exclusive";
  68                                         case PolicyStatementAttribute.LevelFinal:
  69                                                 return "LevelFinal";
  70                                         case PolicyStatementAttribute.All:
  71                                                 return "Exclusive LevelFinal";
  72                                         default:
  73                                                 return String.Empty;
  74                                 }
  75                         }\r
  76                 }\r
  77 \r
  78                 public PolicyStatement Copy ()\r
  79                 {\r
  80                         return new PolicyStatement (perms, attrs);\r
  81                 }\r
  82 \r
  83                 // ISecurityEncodable\r
  84 \r
  85                 public void FromXml (SecurityElement e)\r
  86                 {\r
  87                         FromXml (e, null);\r
  88                 }\r
  89 \r
  90                 public void FromXml (SecurityElement e, PolicyLevel level)\r
  91                 {\r
  92                         SecurityElement permissions = e.SearchForChildByTag ("PermissionSet");\r
  93 \r
  94                         string attributes = e.Attribute ("Attributes");\r
  95 \r
  96                         if (attributes != null)\r
  97                                 attrs = (PolicyStatementAttribute) Enum.Parse (\r
  98                                         typeof (PolicyStatementAttribute), attributes);\r
  99                                 \r
 100                         perms = new PermissionSet (PermissionState.None);\r
 101                         perms.FromXml (permissions);\r
 102                 }\r
 103                 \r
 104                 public SecurityElement ToXml ()\r
 105                 {\r
 106                         return ToXml (null);\r
 107                 }\r
 108 \r
 109                 public SecurityElement ToXml (PolicyLevel level)\r
 110                 {\r
 111                         SecurityElement element = new SecurityElement ("PolicyStatement");\r
 112                         element.AddAttribute ("version", "1");\r
 113 \r
 114                         if (attrs != PolicyStatementAttribute.Nothing)\r
 115                                 element.AddAttribute ("Attributes", attrs.ToString ());\r
 116                         \r
 117                         element.AddChild (perms.ToXml ());\r
 118 \r
 119                         return element;\r
 120                 }
 121
 122 #if NET_2_0
 123                 [ComVisible (false)]
 124                 public override bool Equals (object obj)
 125                 {
 126                         if (obj == null)
 127                                 return false;
 128                         PolicyStatement ps = (obj as PolicyStatement);
 129                         if (ps == null)
 130                                 return false;
 131
 132                         return (perms.Equals (obj) && (attrs == ps.attrs));
 133                 }
 134
 135                 [ComVisible (false)]
 136                 public override int GetHashCode ()
 137                 {
 138                         // return same hash code if two PolicyStatement are equals
 139                         return (perms.GetHashCode () ^ (int) attrs);
 140                 }
 141 #endif
 142
 143                 internal static PolicyStatement Empty ()
 144                 {
 145                         return new PolicyStatement (new PermissionSet (PermissionState.None));
 146                 }\r
 147         }\r
 148 }\r