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 using System;
   9
  10 namespace System.Security.Policy {
  11
  12         public sealed class FirstMatchCodeGroup : CodeGroup {
  13
  14                 public FirstMatchCodeGroup(IMembershipCondition membershipCondition, PolicyStatement policy) :
  15                         base (membershipCondition, policy)
  16                 {
  17                 }
  18
  19                 //
  20                 // Public Properties
  21                 //
  22
  23                 public override string MergeLogic
  24                 {
  25                         get { return "First Match"; }
  26                 }
  27
  28                 //
  29                 // Public Methods
  30                 //
  31
  32                 public override CodeGroup Copy()
  33                 {
  34                         FirstMatchCodeGroup copy = CopyNoChildren ();
  35
  36                         foreach (CodeGroup group in Children) {
  37                                 copy.AddChild ( group );
  38                         }
  39
  40                         return copy;
  41                 }
  42
  43                 public override PolicyStatement Resolve(Evidence evidence)
  44                 {
  45                         PolicyStatement policy = null;
  46                         PolicyStatement child_policy;
  47
  48                         if (null == evidence)
  49                                 throw new ArgumentNullException ();
  50
  51                         if (MembershipCondition.Check (evidence)) {
  52                                 if (null != PolicyStatement) {
  53                                         policy = PolicyStatement;
  54                                 } else {
  55                                         // Loop through all children breaking on the first one that resolves
  56                                         foreach (CodeGroup child in Children) {
  57                                                 if (null == (child_policy = child.Resolve (evidence)))
  58                                                         continue;
  59                                                 policy = child_policy;
  60                                                 break;
  61                                         }
  62                                 }
  63                         }
  64
  65                         return policy;
  66                 }
  67
  68                 public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence)
  69                 {
  70                         CodeGroup group = null;
  71
  72                         if (null == evidence)
  73                                 throw new ArgumentNullException ();
  74
  75                         if (MembershipCondition.Check (evidence)) {
  76                                 group = CopyNoChildren ();
  77
  78                                 // Add the first child that resolves
  79                                 foreach (CodeGroup child in Children) {
  80                                         if ( null == child.Resolve (evidence))
  81                                                 continue;
  82                                         group.AddChild (child);
  83                                         break;
  84                                 }
  85                         }
  86
  87                         return group;
  88                 }
  89
  90                 //
  91                 // Private Methods
  92                 //
  93
  94                 private FirstMatchCodeGroup CopyNoChildren()
  95                 {
  96                         FirstMatchCodeGroup copy = new FirstMatchCodeGroup (MembershipCondition, PolicyStatement);
  97
  98                         copy.Name = Name;
  99                         copy.Description = Description;
 100
 101                         return copy;
 102                 }
 103         }
 104
 105 }
 106