class/corlib/System/ArgIterator.cs

   1 //
   2 // System.ArgIterator.cs
   3 //
   4 // Authors:
   5 //   Dick Porter (dick@ximian.com)
   6 //   Paolo Molaro (lupus@ximian.com)
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System.Runtime.CompilerServices;
  35 using System.Runtime.InteropServices;
  36
  37 namespace System
  38 {
  39         [StructLayout (LayoutKind.Auto)]
  40         public struct ArgIterator
  41         {
  42 #pragma warning disable 169, 414
  43                 IntPtr sig;
  44                 IntPtr args;
  45                 int next_arg;
  46                 int num_args;
  47 #pragma warning restore 169, 414
  48
  49                 [MethodImpl (MethodImplOptions.InternalCall)]
  50                 extern void Setup (IntPtr argsp, IntPtr start);
  51
  52                 public ArgIterator (RuntimeArgumentHandle arglist)
  53                 {
  54                         sig = IntPtr.Zero;
  55                         args = IntPtr.Zero;
  56                         next_arg = num_args = 0;
  57                         Setup (arglist.args, IntPtr.Zero);
  58                 }
  59
  60                 [CLSCompliant (false)]
  61                 unsafe public ArgIterator (RuntimeArgumentHandle arglist, void *ptr)
  62                 {
  63                         sig = IntPtr.Zero;
  64                         args = IntPtr.Zero;
  65                         next_arg = num_args = 0;
  66                         Setup (arglist.args, (IntPtr) ptr);
  67                 }
  68
  69                 public void End ()
  70                 {
  71                         next_arg = num_args;
  72                 }
  73
  74                 public override bool Equals (object o)
  75                 {
  76                         throw new NotSupportedException (Locale.GetText ("ArgIterator does not support Equals."));
  77                 }
  78
  79                 public override int GetHashCode ()
  80                 {
  81                         return sig.GetHashCode ();
  82                 }
  83
  84                 [CLSCompliant (false)]
  85                 public TypedReference GetNextArg ()
  86                 {
  87                         if (num_args == next_arg)
  88                                 throw new InvalidOperationException (Locale.GetText ("Invalid iterator position."));
  89                         return IntGetNextArg ();
  90                 }
  91
  92                 [MethodImpl (MethodImplOptions.InternalCall)]
  93                 extern TypedReference IntGetNextArg ();
  94
  95                 [CLSCompliant (false)]
  96                 public TypedReference GetNextArg (RuntimeTypeHandle rth)
  97                 {
  98                         if (num_args == next_arg)
  99                                 throw new InvalidOperationException (Locale.GetText ("Invalid iterator position."));
 100                         return IntGetNextArg (rth.Value);
 101                 }
 102
 103                 [MethodImpl (MethodImplOptions.InternalCall)]
 104                 extern TypedReference IntGetNextArg (IntPtr rth);
 105
 106                 public RuntimeTypeHandle GetNextArgType ()
 107                 {
 108                         if (num_args == next_arg)
 109                                 throw new InvalidOperationException (Locale.GetText ("Invalid iterator position."));
 110                         return new RuntimeTypeHandle (IntGetNextArgType ());
 111                 }
 112
 113                 [MethodImpl (MethodImplOptions.InternalCall)]
 114                 extern IntPtr IntGetNextArgType ();
 115
 116                 public int GetRemainingCount ()
 117                 {
 118                         return num_args - next_arg;
 119                 }
 120         }
 121 }