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