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

   1 //
   2 // System.Security.Policy.FirstMatchCodeGroup
   3 //
   4 // Author(s):
   5 //  Jackson Harper (Jackson@LatitudeGeo.com)
   6 //
   7 // (C) 2002 Jackson Harper, All rights reserved.
   8 // Copyright (C) 2004-2005 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 using System.Runtime.InteropServices;
  31
  32 namespace System.Security.Policy {
  33
  34         [Serializable]
  35 #if NET_2_0
  36         [ComVisible (true)]
  37 #endif
  38         public sealed class FirstMatchCodeGroup : CodeGroup {
  39
  40                 public FirstMatchCodeGroup (IMembershipCondition membershipCondition, PolicyStatement policy)
  41                         : base (membershipCondition, policy)
  42                 {
  43                 }
  44
  45                 // for PolicyLevel (to avoid validation duplication)
  46                 internal FirstMatchCodeGroup (SecurityElement e, PolicyLevel level)
  47                         : base (e, level)
  48                 {
  49                 }
  50
  51                 //
  52                 // Public Properties
  53                 //
  54
  55                 public override string MergeLogic {
  56                         get { return "First Match"; }
  57                 }
  58
  59                 //
  60                 // Public Methods
  61                 //
  62
  63                 public override CodeGroup Copy ()
  64                 {
  65                         FirstMatchCodeGroup copy = CopyNoChildren ();
  66                         foreach (CodeGroup child in Children) {
  67                                 copy.AddChild (child.Copy ());  // deep copy
  68                         }
  69                         return copy;
  70                 }
  71
  72                 public override PolicyStatement Resolve (Evidence evidence)
  73                 {
  74                         if (evidence == null)
  75                                 throw new ArgumentNullException ("evidence");
  76
  77                         if (!MembershipCondition.Check (evidence))
  78                                 return null;
  79
  80                         foreach (CodeGroup child in Children) {
  81                                 PolicyStatement policy = child.Resolve (evidence);
  82                                 if (policy != null) {
  83                                         return policy;  // first match
  84                                 }
  85                         }
  86                         return this.PolicyStatement;    // default
  87                 }
  88
  89                 public override CodeGroup ResolveMatchingCodeGroups (Evidence evidence)
  90                 {
  91                         if (evidence == null)
  92                                 throw new ArgumentNullException ("evidence");
  93
  94                         if (!MembershipCondition.Check (evidence))
  95                                 return null;
  96
  97                         foreach (CodeGroup child in Children) {
  98                                 if (child.Resolve (evidence) != null) {
  99                                         return child.Copy ();   // first match
 100                                         // FIXME copy childrens ?
 101                                 }
 102                         }
 103                         return this.CopyNoChildren ();  // default
 104                 }
 105
 106                 //
 107                 // Private Methods
 108                 //
 109
 110                 private FirstMatchCodeGroup CopyNoChildren ()
 111                 {
 112                         FirstMatchCodeGroup copy = new FirstMatchCodeGroup (MembershipCondition, PolicyStatement);
 113
 114                         copy.Name = Name;
 115                         copy.Description = Description;
 116
 117                         return copy;
 118                 }
 119         }
 120 }