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

   1 // System.Security.Policy.FirstMatchCodeGroup
   2 //
   3 // Author(s):
   4 //  Jackson Harper (Jackson@LatitudeGeo.com)
   5 //
   6 // (C) 2002 Jackson Harper, All rights reserved.
   7
   8 //
   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
  31 using System;
  32
  33 namespace System.Security.Policy {
  34
  35         [Serializable]
  36         public sealed class FirstMatchCodeGroup : CodeGroup {
  37
  38                 public FirstMatchCodeGroup (IMembershipCondition membershipCondition, PolicyStatement policy) :
  39                         base (membershipCondition, policy) {}
  40
  41                 // for PolicyLevel (to avoid validation duplication)
  42                 internal FirstMatchCodeGroup (SecurityElement e) : base (e) {}
  43
  44                 //
  45                 // Public Properties
  46                 //
  47
  48                 public override string MergeLogic
  49                 {
  50                         get { return "First Match"; }
  51                 }
  52
  53                 //
  54                 // Public Methods
  55                 //
  56
  57                 public override CodeGroup Copy()
  58                 {
  59                         FirstMatchCodeGroup copy = CopyNoChildren ();
  60                         foreach (CodeGroup child in Children) {
  61                                 copy.AddChild (child.Copy ());  // deep copy
  62                         }
  63                         return copy;
  64                 }
  65
  66                 public override PolicyStatement Resolve(Evidence evidence)
  67                 {
  68                         PolicyStatement policy = null;
  69                         PolicyStatement child_policy;
  70
  71                         if (null == evidence)
  72                                 throw new ArgumentNullException ();
  73
  74                         if (MembershipCondition.Check (evidence)) {
  75                                 if (null != PolicyStatement) {
  76                                         policy = PolicyStatement;
  77                                 } else {
  78                                         // Loop through all children breaking on the first one that resolves
  79                                         foreach (CodeGroup child in Children) {
  80                                                 if (null == (child_policy = child.Resolve (evidence)))
  81                                                         continue;
  82                                                 policy = child_policy;
  83                                                 break;
  84                                         }
  85                                 }
  86                         }
  87
  88                         return policy;
  89                 }
  90
  91                 public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence)
  92                 {
  93                         CodeGroup group = null;
  94
  95                         if (null == evidence)
  96                                 throw new ArgumentNullException ();
  97
  98                         if (MembershipCondition.Check (evidence)) {
  99                                 group = CopyNoChildren ();
 100
 101                                 // Add the first child that resolves
 102                                 foreach (CodeGroup child in Children) {
 103                                         if ( null == child.Resolve (evidence))
 104                                                 continue;
 105                                         group.AddChild (child);
 106                                         break;
 107                                 }
 108                         }
 109
 110                         return group;
 111                 }
 112
 113                 //
 114                 // Private Methods
 115                 //
 116
 117                 private FirstMatchCodeGroup CopyNoChildren()
 118                 {
 119                         FirstMatchCodeGroup copy = new FirstMatchCodeGroup (MembershipCondition, PolicyStatement);
 120
 121                         copy.Name = Name;
 122                         copy.Description = Description;
 123
 124                         return copy;
 125                 }
 126         }
 127
 128 }
 129