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         [StructLayout (LayoutKind.Sequential)]
  46         internal class MonoField : FieldInfo, ISerializable {
  47                 internal IntPtr klass;
  48                 internal RuntimeFieldHandle fhandle;
  49                 string name;
  50                 Type type;
  51                 FieldAttributes attrs;
  52
  53                 public override FieldAttributes Attributes {
  54                         get {
  55                                 return attrs;
  56                         }
  57                 }
  58                 public override RuntimeFieldHandle FieldHandle {
  59                         get {
  60                                 return fhandle;
  61                         }
  62                 }
  63
  64                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  65                 extern Type ResolveType ();
  66
  67                 public override Type FieldType {
  68                         get {
  69                                 if (type == null)
  70                                         type = ResolveType ();
  71                                 return type;
  72                         }
  73                 }
  74
  75                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  76                 private extern Type GetParentType (bool declaring);
  77
  78                 public override Type ReflectedType {
  79                         get {
  80                                 return GetParentType (false);
  81                         }
  82                 }
  83                 public override Type DeclaringType {
  84                         get {
  85                                 return GetParentType (true);
  86                         }
  87                 }
  88                 public override string Name {
  89                         get {
  90                                 return name;
  91                         }
  92                 }
  93
  94                 public override bool IsDefined (Type attributeType, bool inherit) {
  95                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
  96                 }
  97
  98                 public override object[] GetCustomAttributes( bool inherit) {
  99                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 100                 }
 101                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 102                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 103                 }
 104
 105                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 106                 internal override extern int GetFieldOffset ();
 107
 108                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 109                 private extern object GetValueInternal (object obj);
 110
 111                 public override object GetValue (object obj)
 112                 {
 113                         if (!IsStatic) {
 114                                 if (obj == null)
 115                                         throw new TargetException ("Non-static field requires a target");
 116                                 if (!DeclaringType.IsAssignableFrom (obj.GetType ()))
 117                                         throw new ArgumentException (string.Format (
 118                                                 "Field {0} defined on type {1} is not a field on the target object which is of type {2}.",
 119                                                 Name, DeclaringType, obj.GetType ()),
 120                                                 "obj");
 121                         }
 122
 123                         if (!IsLiteral)
 124                                 CheckGeneric ();
 125                         return GetValueInternal (obj);
 126                 }
 127
 128                 public override string ToString () {
 129                         return String.Format ("{0} {1}", FieldType, name);
 130                 }
 131
 132                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 133                 private static extern void SetValueInternal (FieldInfo fi, object obj, object value);
 134
 135                 public override void SetValue (object obj, object val, BindingFlags invokeAttr, Binder binder, CultureInfo culture)
 136                 {
 137                         if (!IsStatic) {
 138                                 if (obj == null)
 139                                         throw new TargetException ("Non-static field requires a target");
 140                                 if (!DeclaringType.IsAssignableFrom (obj.GetType ()))
 141                                         throw new ArgumentException (string.Format (
 142                                                 "Field {0} defined on type {1} is not a field on the target object which is of type {2}.",
 143                                                 Name, DeclaringType, obj.GetType ()),
 144                                                 "obj");
 145                         }
 146                         if (IsLiteral)
 147                                 throw new FieldAccessException ("Cannot set a constant field");
 148                         if (binder == null)
 149                                 binder = Binder.DefaultBinder;
 150                         CheckGeneric ();
 151                         if (val != null) {
 152                                 val = binder.ConvertValue (val, FieldType, culture, (invokeAttr & BindingFlags.ExactBinding) != 0);
 153                         }
 154                         SetValueInternal (this, obj, val);
 155                 }
 156
 157                 internal MonoField Clone (string newName)
 158                 {
 159                         MonoField field = new MonoField ();
 160                         field.name = newName;
 161                         field.type = type;
 162                         field.attrs = attrs;
 163                         field.klass = klass;
 164                         field.fhandle = fhandle;
 165                         return field;
 166                 }
 167
 168                 // ISerializable
 169                 public void GetObjectData (SerializationInfo info, StreamingContext context)
 170                 {
 171                         MemberInfoSerializationHolder.Serialize (info, Name, ReflectedType,
 172                                 ToString(), MemberTypes.Field);
 173                 }
 174
 175                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 176                 public override extern object GetRawConstantValue ();
 177
 178                 public override IList<CustomAttributeData> GetCustomAttributesData () {
 179                         return CustomAttributeData.GetCustomAttributes (this);
 180                 }
 181
 182                 void CheckGeneric () {
 183                         if (DeclaringType.ContainsGenericParameters)
 184                                 throw new InvalidOperationException ("Late bound operations cannot be performed on fields with types for which Type.ContainsGenericParameters is true.");
 185             }
 186         }
 187 }