mcs/class/corlib/System.Threading/CompressedStack.cs

   1 //
   2 // System.Threading.Thread.cs
   3 //
   4 // Authors:
   5 //      Zoltan Varga (vargaz@freemail.hu)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   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.Collections;
  31 using System.Diagnostics;
  32 using System.Reflection;
  33 using System.Runtime.InteropServices;
  34 using System.Runtime.Serialization;
  35 using System.Security;
  36 using System.Security.Permissions;
  37
  38 namespace System.Threading {
  39
  40 #if NET_2_0
  41         [Serializable]
  42         [ComVisibleAttribute (false)]
  43         public sealed class CompressedStack : ISerializable {
  44 #else
  45         public class CompressedStack {
  46 #endif
  47                 private ArrayList _list;
  48
  49                 internal CompressedStack (int length)
  50                 {
  51                         if (length > 0)
  52                                 _list = new ArrayList (length);
  53                 }
  54
  55                 internal CompressedStack (CompressedStack cs)
  56                 {
  57                         if ((cs != null) && (cs._list != null))
  58                                 _list = (ArrayList) cs._list.Clone ();
  59                 }
  60
  61                 ~CompressedStack ()
  62                 {
  63                 }
  64
  65 #if NET_2_0
  66                 [ComVisibleAttribute (false)]
  67                 public CompressedStack CreateCopy ()
  68                 {
  69                         // FIXME: in 2.0 beta1 Object.ReferenceEquals (cs, cs.CreateCopy ()) == true !!!
  70                         return this;
  71 //                      return new CompressedStack (this);
  72                 }
  73
  74                 [MonoTODO ("incomplete")]
  75                 public void GetObjectData (SerializationInfo info, StreamingContext context)
  76                 {
  77                         if (info == null)
  78                                 throw new ArgumentNullException ("info");
  79                 }
  80
  81                 static public CompressedStack Capture ()
  82                 {
  83                         CompressedStack cs = new CompressedStack (0);
  84                         cs._list = SecurityFrame.GetStack (1);
  85                         return cs;
  86                 }
  87
  88                 [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
  89                 [StrongNameIdentityPermission (SecurityAction.LinkDemand, PublicKey="00000000000000000400000000000000")]
  90                 static public CompressedStack GetCompressedStack ()
  91                 {
  92                         // Note: CompressedStack.GetCompressedStack doesn't return null
  93                         // like Thread.CurrentThread.GetCompressedStack if no compressed
  94                         // stack is present.
  95                         return new CompressedStack (Thread.CurrentThread.GetCompressedStack ());
  96                 }
  97
  98                 static public CompressedStackSwitcher SetCompressedStack (CompressedStack cs)
  99                 {
 100                         Thread t = Thread.CurrentThread;
 101                         CompressedStack ctcs = t.GetCompressedStack ();
 102                         if (ctcs != null) {
 103                                 string msg = Locale.GetText ("You must Undo previous CompressedStack.");
 104                                 throw new SecurityException (msg);
 105                         }
 106                         CompressedStackSwitcher csw = new CompressedStackSwitcher (ctcs, t);
 107                         t.SetCompressedStack (cs);
 108                         return csw;
 109                 }
 110 #endif
 111                 internal bool Equals (CompressedStack cs)
 112                 {
 113                         if (IsEmpty ())
 114                                 return cs.IsEmpty ();
 115                         if (cs.IsEmpty ())
 116                                 return false;
 117                         if (_list.Count != cs._list.Count)
 118                                 return false;
 119
 120                         for (int i=0; i < _list.Count; i++) {
 121                                 SecurityFrame sf1 = (SecurityFrame) _list [i];
 122                                 SecurityFrame sf2 = (SecurityFrame) cs._list [i];
 123                                 if (!sf1.Equals (sf2))
 124                                         return false;
 125                         }
 126                         return true;
 127                 }
 128
 129                 internal bool IsEmpty ()
 130                 {
 131                         return ((_list == null) || (_list.Count == 0));
 132                 }
 133
 134                 internal IList List {
 135                         get { return _list; }
 136                 }
 137         }
 138 }