mcs/class/referencesource/mscorlib/system/security/permissionsetenumerator.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 // <OWNER>Microsoft</OWNER>
   7 //
   8
   9 namespace System.Security
  10 {
  11     //PermissionSetEnumerator.cs
  12
  13     using System;
  14     using System.Collections;
  15     using TokenBasedSetEnumerator = System.Security.Util.TokenBasedSetEnumerator;
  16     using TokenBasedSet = System.Security.Util.TokenBasedSet;
  17
  18     internal class PermissionSetEnumerator : IEnumerator
  19     {
  20         PermissionSetEnumeratorInternal enm;
  21
  22         public Object Current
  23         {
  24             get
  25             {
  26                 return enm.Current;
  27             }
  28         }
  29
  30         public bool MoveNext()
  31         {
  32             return enm.MoveNext();
  33         }
  34
  35         public void Reset()
  36         {
  37             enm.Reset();
  38         }
  39
  40         internal PermissionSetEnumerator(PermissionSet permSet)
  41         {
  42             enm = new PermissionSetEnumeratorInternal(permSet);
  43         }
  44     }
  45
  46     internal struct PermissionSetEnumeratorInternal
  47     {
  48         private PermissionSet m_permSet;
  49         private TokenBasedSetEnumerator enm;
  50
  51         public Object Current
  52         {
  53             get
  54             {
  55                 return enm.Current;
  56             }
  57         }
  58
  59         internal PermissionSetEnumeratorInternal(PermissionSet permSet)
  60         {
  61             m_permSet = permSet;
  62             enm = new TokenBasedSetEnumerator(permSet.m_permSet);
  63         }
  64
  65         public int GetCurrentIndex()
  66         {
  67             return enm.Index;
  68         }
  69
  70         public void Reset()
  71         {
  72             enm.Reset();
  73         }
  74
  75         public bool MoveNext()
  76         {
  77             while (enm.MoveNext())
  78             {
  79                 Object obj = enm.Current;
  80                 IPermission perm = obj as IPermission;
  81                 if (perm != null)
  82                 {
  83                     enm.Current = perm;
  84                     return true;
  85                 }
  86
  87 #if FEATURE_CAS_POLICY
  88                 SecurityElement elem = obj as SecurityElement;
  89
  90                 if (elem != null)
  91                 {
  92                     perm = m_permSet.CreatePermission(elem, enm.Index);
  93                     if (perm != null)
  94                     {
  95                         enm.Current = perm;
  96                         return true;
  97                     }
  98                 }
  99 #endif // FEATURE_CAS_POLICY
 100             }
 101             return false;
 102         }
 103     }
 104 }
 105