mcs/class/corlib/System.Reflection/FieldInfo.cs

   1 //
   2 // System.Reflection.FieldInfo.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) Ximian, Inc.  http://www.ximian.com
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 // Copyright 2011 Xamarin Inc (http://www.xamarin.com).
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29
  30 using System.Diagnostics;
  31 using System.Globalization;
  32 using System.Runtime.CompilerServices;
  33 using System.Runtime.InteropServices;
  34
  35 namespace System.Reflection {
  36
  37         [ComVisible (true)]
  38         [ComDefaultInterfaceAttribute (typeof (_FieldInfo))]
  39         [Serializable]
  40         [ClassInterface(ClassInterfaceType.None)]
  41 #if MOBILE
  42         public abstract class FieldInfo : MemberInfo {
  43 #else
  44         public abstract class FieldInfo : MemberInfo, _FieldInfo {
  45 #endif
  46                 public abstract FieldAttributes Attributes {get;}
  47                 public abstract RuntimeFieldHandle FieldHandle {get;}
  48
  49                 protected FieldInfo () {}
  50
  51                 public abstract Type FieldType { get; }
  52
  53                 public abstract object GetValue(object obj);
  54
  55                 public override MemberTypes MemberType {
  56                         get { return MemberTypes.Field;}
  57                 }
  58
  59                 public bool IsLiteral
  60                 {
  61                         get {return (Attributes & FieldAttributes.Literal) != 0;}
  62                 }
  63
  64                 public bool IsStatic
  65                 {
  66                         get {return (Attributes & FieldAttributes.Static) != 0;}
  67                 }
  68
  69                 public bool IsInitOnly
  70                 {
  71                         get {return (Attributes & FieldAttributes.InitOnly) != 0;}
  72                 }
  73                 public Boolean IsPublic
  74                 {
  75                         get
  76                         {
  77                                 return (Attributes & FieldAttributes.FieldAccessMask) == FieldAttributes.Public;
  78                         }
  79                 }
  80                 public Boolean IsPrivate
  81                 {
  82                         get
  83                         {
  84                                 return (Attributes & FieldAttributes.FieldAccessMask) == FieldAttributes.Private;
  85                         }
  86                 }
  87                 public Boolean IsFamily
  88                 {
  89                         get
  90                         {
  91                                 return (Attributes & FieldAttributes.FieldAccessMask) == FieldAttributes.Family;
  92                         }
  93                 }
  94                 public Boolean IsAssembly
  95                 {
  96                         get
  97                         {
  98                                 return (Attributes & FieldAttributes.FieldAccessMask) == FieldAttributes.Assembly;
  99                         }
 100                 }
 101                 public Boolean IsFamilyAndAssembly
 102                 {
 103                         get {
 104                                 return (Attributes & FieldAttributes.FieldAccessMask) == FieldAttributes.FamANDAssem;
 105                         }
 106                 }
 107                 public Boolean IsFamilyOrAssembly
 108                 {
 109                         get
 110                         {
 111                                 return (Attributes & FieldAttributes.FieldAccessMask) == FieldAttributes.FamORAssem;
 112                         }
 113                 }
 114                 public Boolean IsPinvokeImpl
 115                 {
 116                         get
 117                         {
 118                                 return (Attributes & FieldAttributes.PinvokeImpl) == FieldAttributes.PinvokeImpl;
 119                         }
 120                 }
 121                 public Boolean IsSpecialName
 122                 {
 123                         get
 124                         {
 125                                 return (Attributes & FieldAttributes.SpecialName) == FieldAttributes.SpecialName;
 126                         }
 127                 }
 128                 public Boolean IsNotSerialized
 129                 {
 130                         get
 131                         {
 132                                 return (Attributes & FieldAttributes.NotSerialized) == FieldAttributes.NotSerialized;
 133                         }
 134                 }
 135
 136                 public abstract void SetValue (object obj, object value, BindingFlags invokeAttr, Binder binder, CultureInfo culture);
 137
 138                 [DebuggerHidden]
 139                 [DebuggerStepThrough]
 140                 public void SetValue (object obj, object value)
 141                 {
 142                         SetValue (obj, value, 0, null, null);
 143                 }
 144
 145                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 146                 private static extern FieldInfo internal_from_handle_type (IntPtr field_handle, IntPtr type_handle);
 147
 148                 public static FieldInfo GetFieldFromHandle (RuntimeFieldHandle handle)
 149                 {
 150                         if (handle.Value == IntPtr.Zero)
 151                                 throw new ArgumentException ("The handle is invalid.");
 152                         return internal_from_handle_type (handle.Value, IntPtr.Zero);
 153                 }
 154
 155                 [ComVisible (false)]
 156                 public static FieldInfo GetFieldFromHandle (RuntimeFieldHandle handle, RuntimeTypeHandle declaringType)
 157                 {
 158                         if (handle.Value == IntPtr.Zero)
 159                                 throw new ArgumentException ("The handle is invalid.");
 160                         FieldInfo fi = internal_from_handle_type (handle.Value, declaringType.Value);
 161                         if (fi == null)
 162                                 throw new ArgumentException ("The field handle and the type handle are incompatible.");
 163                         return fi;
 164                 }
 165
 166                 //
 167                 // Note: making this abstract imposes an implementation requirement
 168                 //       on any class that derives from it.  However, since it's also
 169                 //       internal, that means only classes inside corlib can derive
 170                 //       from FieldInfo.  See
 171                 //
 172                 //          errors/cs0534-4.cs errors/CS0534-4-lib.cs
 173                 //
 174                 //          class/Microsoft.JScript/Microsoft.JScript/JSFieldInfo.cs
 175                 //
 176                 internal virtual int GetFieldOffset ()
 177                 {
 178                         throw new SystemException ("This method should not be called");
 179                 }
 180
 181                 [CLSCompliant(false)]
 182                 [MonoTODO("Not implemented")]
 183                 public virtual object GetValueDirect (TypedReference obj)
 184                 {
 185                         throw new NotImplementedException ();
 186                 }
 187
 188                 [CLSCompliant(false)]
 189                 [MonoTODO("Not implemented")]
 190                 public virtual void SetValueDirect (TypedReference obj, object value)
 191                 {
 192                         throw new NotImplementedException ();
 193                 }
 194
 195                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 196                 private extern MarshalAsAttribute get_marshal_info ();
 197
 198                 internal object[] GetPseudoCustomAttributes ()
 199                 {
 200                         int count = 0;
 201
 202                         if (IsNotSerialized)
 203                                 count ++;
 204
 205                         if (DeclaringType.IsExplicitLayout)
 206                                 count ++;
 207
 208                         MarshalAsAttribute marshalAs = get_marshal_info ();
 209                         if (marshalAs != null)
 210                                 count ++;
 211
 212                         if (count == 0)
 213                                 return null;
 214                         object[] attrs = new object [count];
 215                         count = 0;
 216
 217                         if (IsNotSerialized)
 218                                 attrs [count ++] = new NonSerializedAttribute ();
 219                         if (DeclaringType.IsExplicitLayout)
 220                                 attrs [count ++] = new FieldOffsetAttribute (GetFieldOffset ());
 221                         if (marshalAs != null)
 222                                 attrs [count ++] = marshalAs;
 223
 224                         return attrs;
 225                 }
 226
 227                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 228                 extern Type[] GetTypeModifiers (bool optional);
 229
 230                 public virtual Type[] GetOptionalCustomModifiers () {
 231                         Type[] types = GetTypeModifiers (true);
 232                         if (types == null)
 233                                 return Type.EmptyTypes;
 234                         return types;
 235                 }
 236
 237                 public virtual Type[] GetRequiredCustomModifiers () {
 238                         Type[] types = GetTypeModifiers (false);
 239                         if (types == null)
 240                                 return Type.EmptyTypes;
 241                         return types;
 242                 }
 243
 244                 public virtual object GetRawConstantValue ()
 245                 {
 246                         throw new NotSupportedException ("This non-CLS method is not implemented.");
 247                 }
 248
 249
 250 #if NET_4_0
 251                 public override bool Equals (object obj)
 252                 {
 253                         return obj == (object) this;
 254                 }
 255
 256                 public override int GetHashCode ()
 257                 {
 258                         return base.GetHashCode ();
 259                 }
 260
 261                 public static bool operator == (FieldInfo left, FieldInfo right)
 262                 {
 263                         if ((object)left == (object)right)
 264                                 return true;
 265                         if ((object)left == null ^ (object)right == null)
 266                                 return false;
 267                         return left.Equals (right);
 268                 }
 269
 270                 public static bool operator != (FieldInfo left, FieldInfo right)
 271                 {
 272                         if ((object)left == (object)right)
 273                                 return false;
 274                         if ((object)left == null ^ (object)right == null)
 275                                 return true;
 276                         return !left.Equals (right);
 277                 }
 278
 279                 public virtual bool IsSecurityCritical {
 280                         get {
 281                                 throw new NotImplementedException ();
 282                         }
 283                 }
 284
 285                 public virtual bool IsSecuritySafeCritical {
 286                         get {
 287                                 throw new NotImplementedException ();
 288                         }
 289                 }
 290
 291                 public virtual bool IsSecurityTransparent {
 292                         get {
 293                                 throw new NotImplementedException ();
 294                         }
 295                 }
 296 #endif
 297
 298 #if !MOBILE
 299                 void _FieldInfo.GetIDsOfNames ([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 300                 {
 301                         throw new NotImplementedException ();
 302                 }
 303
 304                 Type _FieldInfo.GetType ()
 305                 {
 306                         // Required or object::GetType becomes virtual final
 307                         return base.GetType ();
 308                 }
 309
 310                 void _FieldInfo.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 311                 {
 312                         throw new NotImplementedException ();
 313                 }
 314
 315                 void _FieldInfo.GetTypeInfoCount (out uint pcTInfo)
 316                 {
 317                         throw new NotImplementedException ();
 318                 }
 319
 320                 void _FieldInfo.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 321                 {
 322                         throw new NotImplementedException ();
 323                 }
 324 #endif
 325         }
 326 }