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         [ComVisible (true)]
  36         public sealed class FirstMatchCodeGroup : CodeGroup {
  37
  38                 public FirstMatchCodeGroup (IMembershipCondition membershipCondition, PolicyStatement policy)
  39                         : base (membershipCondition, policy)
  40                 {
  41                 }
  42
  43                 // for PolicyLevel (to avoid validation duplication)
  44                 internal FirstMatchCodeGroup (SecurityElement e, PolicyLevel level)
  45                         : base (e, level)
  46                 {
  47                 }
  48
  49                 //
  50                 // Public Properties
  51                 //
  52
  53                 public override string MergeLogic {
  54                         get { return "First Match"; }
  55                 }
  56
  57                 //
  58                 // Public Methods
  59                 //
  60
  61                 public override CodeGroup Copy ()
  62                 {
  63                         FirstMatchCodeGroup copy = CopyNoChildren ();
  64                         foreach (CodeGroup child in Children) {
  65                                 copy.AddChild (child.Copy ());  // deep copy
  66                         }
  67                         return copy;
  68                 }
  69
  70                 public override PolicyStatement Resolve (Evidence evidence)
  71                 {
  72                         if (evidence == null)
  73                                 throw new ArgumentNullException ("evidence");
  74
  75                         if (!MembershipCondition.Check (evidence))
  76                                 return null;
  77
  78                         foreach (CodeGroup child in Children) {
  79                                 PolicyStatement policy = child.Resolve (evidence);
  80                                 if (policy != null) {
  81                                         return policy;  // first match
  82                                 }
  83                         }
  84                         return this.PolicyStatement;    // default
  85                 }
  86
  87                 public override CodeGroup ResolveMatchingCodeGroups (Evidence evidence)
  88                 {
  89                         if (evidence == null)
  90                                 throw new ArgumentNullException ("evidence");
  91
  92                         if (!MembershipCondition.Check (evidence))
  93                                 return null;
  94
  95                         foreach (CodeGroup child in Children) {
  96                                 if (child.Resolve (evidence) != null) {
  97                                         return child.Copy ();   // first match
  98                                         // FIXME copy childrens ?
  99                                 }
 100                         }
 101                         return this.CopyNoChildren ();  // default
 102                 }
 103
 104                 //
 105                 // Private Methods
 106                 //
 107
 108                 private FirstMatchCodeGroup CopyNoChildren ()
 109                 {
 110                         FirstMatchCodeGroup copy = new FirstMatchCodeGroup (MembershipCondition, PolicyStatement);
 111
 112                         copy.Name = Name;
 113                         copy.Description = Description;
 114
 115                         return copy;
 116                 }
 117         }
 118 }