mcs/class/corlib/ReferenceSources/Type.cs

   1 //
   2 // Type.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2015 Xamarin Inc (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.Reflection;
  30 using System.Runtime.CompilerServices;
  31 using System.Runtime.InteropServices;
  32
  33 namespace System
  34 {
  35         partial class Type : MemberInfo
  36         {
  37                 internal RuntimeTypeHandle _impl;
  38
  39                 #region Requires stack backtracing fixes in unmanaged type_from_name
  40
  41                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  42                 static extern Type internal_from_name (string name, bool throwOnError, bool ignoreCase);
  43
  44                 public static Type GetType(string typeName)
  45                 {
  46                         if (typeName == null)
  47                                 throw new ArgumentNullException ("TypeName");
  48
  49                         return internal_from_name (typeName, false, false);
  50                 }
  51
  52                 public static Type GetType(string typeName, bool throwOnError)
  53                 {
  54                         if (typeName == null)
  55                                 throw new ArgumentNullException ("TypeName");
  56
  57                         Type type = internal_from_name (typeName, throwOnError, false);
  58                         if (throwOnError && type == null)
  59                                 throw new TypeLoadException ("Error loading '" + typeName + "'");
  60
  61                         return type;
  62                 }
  63
  64                 public static Type GetType(string typeName, bool throwOnError, bool ignoreCase)
  65                 {
  66                         if (typeName == null)
  67                                 throw new ArgumentNullException ("TypeName");
  68
  69                         Type t = internal_from_name (typeName, throwOnError, ignoreCase);
  70                         if (throwOnError && t == null)
  71                                 throw new TypeLoadException ("Error loading '" + typeName + "'");
  72
  73                         return t;
  74                 }
  75
  76                 #endregion
  77
  78                 // TODO: Merge with internal_from_name
  79                 public static Type ReflectionOnlyGetType (string typeName,
  80                                                           bool throwIfNotFound,
  81                                                           bool ignoreCase)
  82                 {
  83                         if (typeName == null)
  84                                 throw new ArgumentNullException ("typeName");
  85                         int idx = typeName.IndexOf (',');
  86                         if (idx < 0 || idx == 0 || idx == typeName.Length - 1)
  87                                 throw new ArgumentException ("Assembly qualifed type name is required", "typeName");
  88                         string an = typeName.Substring (idx + 1);
  89                         Assembly a;
  90                         try {
  91                                 a = Assembly.ReflectionOnlyLoad (an);
  92                         } catch {
  93                                 if (throwIfNotFound)
  94                                         throw;
  95                                 return null;
  96                         }
  97                         return a.GetType (typeName.Substring (0, idx), throwIfNotFound, ignoreCase);
  98                 }
  99
 100                 internal virtual Type InternalResolve ()
 101                 {
 102                         return UnderlyingSystemType;
 103                 }
 104
 105                 internal virtual bool IsUserType {
 106                         get {
 107                                 return true;
 108                         }
 109                 }
 110
 111                 internal virtual MethodInfo GetMethod (MethodInfo fromNoninstanciated)
 112                 {
 113                         throw new System.InvalidOperationException ("can only be called in generic type");
 114                 }
 115
 116                 internal virtual ConstructorInfo GetConstructor (ConstructorInfo fromNoninstanciated)
 117                 {
 118                         throw new System.InvalidOperationException ("can only be called in generic type");
 119                 }
 120
 121                 internal virtual FieldInfo GetField (FieldInfo fromNoninstanciated)
 122                 {
 123                         throw new System.InvalidOperationException ("can only be called in generic type");
 124                 }
 125
 126                 public static Type GetTypeFromHandle (RuntimeTypeHandle handle)
 127                 {
 128                         if (handle.Value == IntPtr.Zero)
 129                                 // This is not consistent with the other GetXXXFromHandle methods, but
 130                                 // MS.NET seems to do this
 131                                 return null;
 132
 133                         return internal_from_handle (handle.Value);
 134                 }
 135
 136                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 137                 static extern Type internal_from_handle (IntPtr handle);
 138         }
 139 }