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

   1
   2 //
   3 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining
   6 // a copy of this software and associated documentation files (the
   7 // "Software"), to deal in the Software without restriction, including
   8 // without limitation the rights to use, copy, modify, merge, publish,
   9 // distribute, sublicense, and/or sell copies of the Software, and to
  10 // permit persons to whom the Software is furnished to do so, subject to
  11 // the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be
  14 // included in all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24
  25 //
  26 // System.Reflection/MonoField.cs
  27 // The class used to represent Fields from the mono runtime.
  28 //
  29 // Author:
  30 //   Paolo Molaro (lupus@ximian.com)
  31 //
  32 // (C) 2001 Ximian, Inc.  http://www.ximian.com
  33 //
  34
  35 using System;
  36 using System.Collections.Generic;
  37 using System.Globalization;
  38 using System.Runtime.CompilerServices;
  39 using System.Runtime.InteropServices;
  40 using System.Runtime.Serialization;
  41
  42 namespace System.Reflection {
  43
  44         [Serializable]
  45         internal class MonoField : FieldInfo, ISerializable {
  46                 internal IntPtr klass;
  47                 internal RuntimeFieldHandle fhandle;
  48                 string name;
  49                 Type type;
  50                 FieldAttributes attrs;
  51
  52                 public override FieldAttributes Attributes {
  53                         get {
  54                                 return attrs;
  55                         }
  56                 }
  57                 public override RuntimeFieldHandle FieldHandle {
  58                         get {
  59                                 return fhandle;
  60                         }
  61                 }
  62
  63                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  64                 extern Type ResolveType ();
  65
  66                 public override Type FieldType {
  67                         get {
  68                                 if (type == null)
  69                                         type = ResolveType ();
  70                                 return type;
  71                         }
  72                 }
  73
  74                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  75                 private extern Type GetParentType (bool declaring);
  76
  77                 public override Type ReflectedType {
  78                         get {
  79                                 return GetParentType (false);
  80                         }
  81                 }
  82                 public override Type DeclaringType {
  83                         get {
  84                                 return GetParentType (true);
  85                         }
  86                 }
  87                 public override string Name {
  88                         get {
  89                                 return name;
  90                         }
  91                 }
  92
  93                 public override bool IsDefined (Type attributeType, bool inherit) {
  94                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
  95                 }
  96
  97                 public override object[] GetCustomAttributes( bool inherit) {
  98                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
  99                 }
 100                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 101                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 102                 }
 103
 104                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 105                 internal override extern int GetFieldOffset ();
 106
 107                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 108                 private extern object GetValueInternal (object obj);
 109
 110                 public override object GetValue (object obj)
 111                 {
 112                         if (!IsStatic) {
 113                                 if (obj == null)
 114                                         throw new TargetException ("Non-static field requires a target");
 115                                 if (!DeclaringType.IsAssignableFrom (obj.GetType ()))
 116                                         throw new ArgumentException (string.Format (
 117                                                 "Field {0} defined on type {1} is not a field on the target object which is of type {2}.",
 118                                                 Name, DeclaringType, obj.GetType ()),
 119                                                 "obj");
 120                         }
 121
 122                         if (!IsLiteral)
 123                                 CheckGeneric ();
 124                         return GetValueInternal (obj);
 125                 }
 126
 127                 public override string ToString () {
 128                         return String.Format ("{0} {1}", FieldType, name);
 129                 }
 130
 131                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 132                 private static extern void SetValueInternal (FieldInfo fi, object obj, object value);
 133
 134                 public override void SetValue (object obj, object val, BindingFlags invokeAttr, Binder binder, CultureInfo culture)
 135                 {
 136                         if (!IsStatic) {
 137                                 if (obj == null)
 138                                         throw new TargetException ("Non-static field requires a target");
 139                                 if (!DeclaringType.IsAssignableFrom (obj.GetType ()))
 140                                         throw new ArgumentException (string.Format (
 141                                                 "Field {0} defined on type {1} is not a field on the target object which is of type {2}.",
 142                                                 Name, DeclaringType, obj.GetType ()),
 143                                                 "obj");
 144                         }
 145                         if (IsLiteral)
 146                                 throw new FieldAccessException ("Cannot set a constant field");
 147                         if (binder == null)
 148                                 binder = Binder.DefaultBinder;
 149                         CheckGeneric ();
 150                         if (val != null) {
 151                                 object newVal;
 152                                 newVal = binder.ChangeType (val, FieldType, culture);
 153                                 if (newVal == null)
 154                                         throw new ArgumentException ("Object type " + val.GetType() + " cannot be converted to target type: " + FieldType, "val");
 155                                 val = newVal;
 156                         }
 157                         SetValueInternal (this, obj, val);
 158                 }
 159
 160                 internal MonoField Clone (string newName)
 161                 {
 162                         MonoField field = new MonoField ();
 163                         field.name = newName;
 164                         field.type = type;
 165                         field.attrs = attrs;
 166                         field.klass = klass;
 167                         field.fhandle = fhandle;
 168                         return field;
 169                 }
 170
 171                 // ISerializable
 172                 public void GetObjectData (SerializationInfo info, StreamingContext context)
 173                 {
 174                         MemberInfoSerializationHolder.Serialize (info, Name, ReflectedType,
 175                                 ToString(), MemberTypes.Field);
 176                 }
 177
 178                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 179                 public override extern object GetRawConstantValue ();
 180
 181 #if NET_4_0
 182                 public override IList<CustomAttributeData> GetCustomAttributesData () {
 183                         return CustomAttributeData.GetCustomAttributes (this);
 184                 }
 185 #endif
 186
 187                 void CheckGeneric () {
 188                         if (DeclaringType.ContainsGenericParameters)
 189                                 throw new InvalidOperationException ("Late bound operations cannot be performed on fields with types for which Type.ContainsGenericParameters is true.");
 190             }
 191         }
 192 }