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

   1 // System.Reflection.ParameterInfo
   2 //
   3 // Sean MacIsaac (macisaac@ximian.com)
   4 //
   5 // (C) 2001 Ximian, Inc.
   6 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining
   9 // a copy of this software and associated documentation files (the
  10 // "Software"), to deal in the Software without restriction, including
  11 // without limitation the rights to use, copy, modify, merge, publish,
  12 // distribute, sublicense, and/or sell copies of the Software, and to
  13 // permit persons to whom the Software is furnished to do so, subject to
  14 // the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be
  17 // included in all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26 //
  27
  28 using System.Reflection.Emit;
  29 using System.Runtime.CompilerServices;
  30 using System.Runtime.InteropServices;
  31 using System.Collections.Generic;
  32
  33 namespace System.Reflection
  34 {
  35         [ComVisible (true)]
  36         [ComDefaultInterfaceAttribute (typeof (_ParameterInfo))]
  37         [Serializable]
  38         [ClassInterfaceAttribute (ClassInterfaceType.None)]
  39         [StructLayout (LayoutKind.Sequential)]
  40         public class ParameterInfo : ICustomAttributeProvider, _ParameterInfo {
  41
  42                 protected Type ClassImpl;
  43                 protected object DefaultValueImpl;
  44                 protected MemberInfo MemberImpl;
  45                 protected string NameImpl;
  46                 protected int PositionImpl;
  47                 protected ParameterAttributes AttrsImpl;
  48                 private UnmanagedMarshal marshalAs;
  49                 //ParameterInfo parent;
  50
  51                 protected ParameterInfo () {
  52                 }
  53
  54                 internal ParameterInfo (ParameterBuilder pb, Type type, MemberInfo member, int position) {
  55                         this.ClassImpl = type;
  56                         this.MemberImpl = member;
  57                         if (pb != null) {
  58                                 this.NameImpl = pb.Name;
  59                                 this.PositionImpl = pb.Position - 1;    // ParameterInfo.Position is zero-based
  60                                 this.AttrsImpl = (ParameterAttributes) pb.Attributes;
  61                         } else {
  62                                 this.NameImpl = null;
  63                                 this.PositionImpl = position - 1;
  64                                 this.AttrsImpl = ParameterAttributes.None;
  65                         }
  66                 }
  67
  68                 /*FIXME this constructor looks very broken in the position parameter*/
  69                 internal ParameterInfo (ParameterInfo pinfo, Type type, MemberInfo member, int position) {
  70                         this.ClassImpl = type;
  71                         this.MemberImpl = member;
  72                         if (pinfo != null) {
  73                                 this.NameImpl = pinfo.Name;
  74                                 this.PositionImpl = pinfo.Position - 1; // ParameterInfo.Position is zero-based
  75                                 this.AttrsImpl = (ParameterAttributes) pinfo.Attributes;
  76                         } else {
  77                                 this.NameImpl = null;
  78                                 this.PositionImpl = position - 1;
  79                                 this.AttrsImpl = ParameterAttributes.None;
  80                         }
  81                 }
  82
  83                 internal ParameterInfo (ParameterInfo pinfo, MemberInfo member) {
  84                         this.ClassImpl = pinfo.ParameterType;
  85                         this.MemberImpl = member;
  86                         this.NameImpl = pinfo.Name;
  87                         this.PositionImpl = pinfo.Position;
  88                         this.AttrsImpl = pinfo.Attributes;
  89                         //this.parent = pinfo;
  90                 }
  91
  92                 /* to build a ParameterInfo for the return type of a method */
  93                 internal ParameterInfo (Type type, MemberInfo member, UnmanagedMarshal marshalAs) {
  94                         this.ClassImpl = type;
  95                         this.MemberImpl = member;
  96                         this.NameImpl = "";
  97                         this.PositionImpl = -1; // since parameter positions are zero-based, return type pos is -1
  98                         this.AttrsImpl = ParameterAttributes.Retval;
  99                         this.marshalAs = marshalAs;
 100                 }
 101
 102                 public override string ToString() {
 103                         Type elementType = ClassImpl;
 104                         while (elementType.HasElementType) {
 105                                         elementType = elementType.GetElementType();
 106                         }
 107                         bool useShort = elementType.IsPrimitive || ClassImpl == typeof(void)
 108                                 || ClassImpl.Namespace == MemberImpl.DeclaringType.Namespace;
 109                         string result = useShort
 110                                 ? ClassImpl.Name
 111                                 : ClassImpl.FullName;
 112                         // MS.NET seems to skip this check and produce an extra space for return types
 113                         if (!IsRetval) {
 114                                 result += ' ';
 115                                 result += NameImpl;
 116                         }
 117                         return result;
 118                 }
 119
 120                 public virtual Type ParameterType {
 121                         get {return ClassImpl;}
 122                 }
 123                 public virtual ParameterAttributes Attributes {
 124                         get {return AttrsImpl;}
 125                 }
 126                 public virtual object DefaultValue {
 127                         get {
 128                                 if (ClassImpl == typeof (Decimal)) {
 129                                         /* default values for decimals are encoded using a custom attribute */
 130                                         DecimalConstantAttribute[] attrs = (DecimalConstantAttribute[])GetCustomAttributes (typeof (DecimalConstantAttribute), false);
 131                                         if (attrs.Length > 0)
 132                                                 return attrs [0].Value;
 133                                 } else if (ClassImpl == typeof (DateTime)) {
 134                                         /* default values for DateTime are encoded using a custom attribute */
 135                                         DateTimeConstantAttribute[] attrs = (DateTimeConstantAttribute[])GetCustomAttributes (typeof (DateTimeConstantAttribute), false);
 136                                         if (attrs.Length > 0)
 137                                                 return new DateTime (attrs [0].Ticks);
 138                                 }
 139                                 return DefaultValueImpl;
 140                         }
 141                 }
 142
 143                 public bool IsIn {
 144                         get {
 145                                 return (Attributes & ParameterAttributes.In) != 0;
 146                         }
 147                 }
 148
 149                 public bool IsLcid {
 150                         get {
 151                                 return (Attributes & ParameterAttributes.Lcid) != 0;
 152                         }
 153                 }
 154
 155                 public bool IsOptional {
 156                         get {
 157                                 return (Attributes & ParameterAttributes.Optional) != 0;
 158                         }
 159                 }
 160
 161                 public bool IsOut {
 162                         get {
 163                                 return (Attributes & ParameterAttributes.Out) != 0;
 164                         }
 165                 }
 166
 167                 public bool IsRetval {
 168                         get {
 169                                 return (Attributes & ParameterAttributes.Retval) != 0;
 170                         }
 171                 }
 172
 173                 public virtual MemberInfo Member {
 174                         get {return MemberImpl;}
 175                 }
 176
 177                 public virtual string Name {
 178                         get {return NameImpl;}
 179                 }
 180
 181                 public virtual int Position {
 182                         get {return PositionImpl;}
 183                 }
 184
 185                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 186                 extern int GetMetadataToken ();
 187
 188                 public
 189 #if NET_4_0 || MOONLIGHT
 190                 virtual
 191 #endif
 192                 int MetadataToken {
 193                         get {
 194                                 if (MemberImpl is PropertyInfo) {
 195                                         PropertyInfo prop = (PropertyInfo)MemberImpl;
 196                                         MethodInfo mi = prop.GetGetMethod (true);
 197                                         if (mi == null)
 198                                                 mi = prop.GetSetMethod (true);
 199                                         /*TODO expose and use a GetParametersNoCopy()*/
 200                                         return mi.GetParameters () [PositionImpl].MetadataToken;
 201                                 } else if (MemberImpl is MethodBase) {
 202                                         return GetMetadataToken ();
 203                                 }
 204                                 throw new ArgumentException ("Can't produce MetadataToken for member of type " + MemberImpl.GetType ());
 205                         }
 206                 }
 207
 208                 public virtual object[] GetCustomAttributes (bool inherit)
 209                 {
 210                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 211                 }
 212
 213                 public virtual object[] GetCustomAttributes (Type attributeType, bool inherit)
 214                 {
 215                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 216                 }
 217
 218                 public virtual bool IsDefined( Type attributeType, bool inherit) {
 219                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
 220                 }
 221
 222                 internal object[] GetPseudoCustomAttributes () {
 223                         int count = 0;
 224
 225                         if (IsIn)
 226                                 count ++;
 227                         if (IsOut)
 228                                 count ++;
 229                         if (IsOptional)
 230                                 count ++;
 231                         if (marshalAs != null)
 232                                 count ++;
 233
 234                         if (count == 0)
 235                                 return null;
 236                         object[] attrs = new object [count];
 237                         count = 0;
 238
 239                         if (IsIn)
 240                                 attrs [count ++] = new InAttribute ();
 241                         if (IsOptional)
 242                                 attrs [count ++] = new OptionalAttribute ();
 243                         if (IsOut)
 244                                 attrs [count ++] = new OutAttribute ();
 245
 246                         if (marshalAs != null)
 247                                 attrs [count ++] = marshalAs.ToMarshalAsAttribute ();
 248
 249                         return attrs;
 250                 }
 251
 252                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 253                 extern Type[] GetTypeModifiers (bool optional);
 254
 255                 public virtual Type[] GetOptionalCustomModifiers () {
 256                         Type[] types = GetTypeModifiers (true);
 257                         if (types == null)
 258                                 return Type.EmptyTypes;
 259                         return types;
 260                 }
 261
 262                 public virtual Type[] GetRequiredCustomModifiers () {
 263                         Type[] types = GetTypeModifiers (false);
 264                         if (types == null)
 265                                 return Type.EmptyTypes;
 266                         return types;
 267                 }
 268
 269                 public virtual object RawDefaultValue {
 270                         get {
 271                                 /*FIXME right now DefaultValue doesn't throw for reflection-only assemblies. Change this once the former is fixed.*/
 272                                 return DefaultValue;
 273                         }
 274                 }
 275
 276 #if NET_4_0
 277                 public virtual IList<CustomAttributeData> GetCustomAttributesData () {
 278                         return CustomAttributeData.GetCustomAttributes (this);
 279                 }
 280 #endif
 281
 282                 void _ParameterInfo.GetIDsOfNames ([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 283                 {
 284                         throw new NotImplementedException ();
 285                 }
 286
 287                 void _ParameterInfo.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 288                 {
 289                         throw new NotImplementedException ();
 290                 }
 291
 292                 void _ParameterInfo.GetTypeInfoCount (out uint pcTInfo)
 293                 {
 294                         throw new NotImplementedException ();
 295                 }
 296
 297                 void _ParameterInfo.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams,
 298                         IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 299                 {
 300                         throw new NotImplementedException ();
 301                 }
 302         }
 303 }