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         public class ParameterInfo : ICustomAttributeProvider, _ParameterInfo {
  40
  41                 protected Type ClassImpl;
  42                 protected object DefaultValueImpl;
  43                 protected MemberInfo MemberImpl;
  44                 protected string NameImpl;
  45                 protected int PositionImpl;
  46                 protected ParameterAttributes AttrsImpl;
  47                 private UnmanagedMarshal marshalAs;
  48                 //ParameterInfo parent;
  49
  50                 protected ParameterInfo () {
  51                 }
  52
  53                 internal ParameterInfo (ParameterBuilder pb, Type type, MemberInfo member, int position) {
  54                         this.ClassImpl = type;
  55                         this.MemberImpl = member;
  56                         if (pb != null) {
  57                                 this.NameImpl = pb.Name;
  58                                 this.PositionImpl = pb.Position - 1;    // ParameterInfo.Position is zero-based
  59                                 this.AttrsImpl = (ParameterAttributes) pb.Attributes;
  60                         } else {
  61                                 this.NameImpl = null;
  62                                 this.PositionImpl = position - 1;
  63                                 this.AttrsImpl = ParameterAttributes.None;
  64                         }
  65                 }
  66
  67                 /*FIXME this constructor looks very broken in the position parameter*/
  68                 internal ParameterInfo (ParameterInfo pinfo, Type type, MemberInfo member, int position) {
  69                         this.ClassImpl = type;
  70                         this.MemberImpl = member;
  71                         if (pinfo != null) {
  72                                 this.NameImpl = pinfo.Name;
  73                                 this.PositionImpl = pinfo.Position - 1; // ParameterInfo.Position is zero-based
  74                                 this.AttrsImpl = (ParameterAttributes) pinfo.Attributes;
  75                         } else {
  76                                 this.NameImpl = null;
  77                                 this.PositionImpl = position - 1;
  78                                 this.AttrsImpl = ParameterAttributes.None;
  79                         }
  80                 }
  81
  82                 internal ParameterInfo (ParameterInfo pinfo, MemberInfo member) {
  83                         this.ClassImpl = pinfo.ParameterType;
  84                         this.MemberImpl = member;
  85                         this.NameImpl = pinfo.Name;
  86                         this.PositionImpl = pinfo.Position;
  87                         this.AttrsImpl = pinfo.Attributes;
  88                         //this.parent = pinfo;
  89                 }
  90
  91                 /* to build a ParameterInfo for the return type of a method */
  92                 internal ParameterInfo (Type type, MemberInfo member, UnmanagedMarshal marshalAs) {
  93                         this.ClassImpl = type;
  94                         this.MemberImpl = member;
  95                         this.NameImpl = "";
  96                         this.PositionImpl = -1; // since parameter positions are zero-based, return type pos is -1
  97                         this.AttrsImpl = ParameterAttributes.Retval;
  98                         this.marshalAs = marshalAs;
  99                 }
 100
 101                 public override string ToString() {
 102                         Type elementType = ClassImpl;
 103                         while (elementType.HasElementType) {
 104                                         elementType = elementType.GetElementType();
 105                         }
 106                         bool useShort = elementType.IsPrimitive || ClassImpl == typeof(void)
 107                                 || ClassImpl.Namespace == MemberImpl.DeclaringType.Namespace;
 108                         string result = useShort
 109                                 ? ClassImpl.Name
 110                                 : ClassImpl.FullName;
 111                         // MS.NET seems to skip this check and produce an extra space for return types
 112                         if (!IsRetval) {
 113                                 result += ' ';
 114                                 result += NameImpl;
 115                         }
 116                         return result;
 117                 }
 118
 119                 public virtual Type ParameterType {
 120                         get {return ClassImpl;}
 121                 }
 122                 public virtual ParameterAttributes Attributes {
 123                         get {return AttrsImpl;}
 124                 }
 125                 public virtual object DefaultValue {
 126                         get {
 127                                 if (ClassImpl == typeof (Decimal)) {
 128                                         /* default values for decimals are encoded using a custom attribute */
 129                                         DecimalConstantAttribute[] attrs = (DecimalConstantAttribute[])GetCustomAttributes (typeof (DecimalConstantAttribute), false);
 130                                         if (attrs.Length > 0)
 131                                                 return attrs [0].Value;
 132                                 } else if (ClassImpl == typeof (DateTime)) {
 133                                         /* default values for DateTime are encoded using a custom attribute */
 134                                         DateTimeConstantAttribute[] attrs = (DateTimeConstantAttribute[])GetCustomAttributes (typeof (DateTimeConstantAttribute), false);
 135                                         if (attrs.Length > 0)
 136                                                 return new DateTime (attrs [0].Ticks);
 137                                 }
 138                                 return DefaultValueImpl;
 139                         }
 140                 }
 141
 142                 public bool IsIn {
 143                         get {
 144                                 return (Attributes & ParameterAttributes.In) != 0;
 145                         }
 146                 }
 147
 148                 public bool IsLcid {
 149                         get {
 150                                 return (Attributes & ParameterAttributes.Lcid) != 0;
 151                         }
 152                 }
 153
 154                 public bool IsOptional {
 155                         get {
 156                                 return (Attributes & ParameterAttributes.Optional) != 0;
 157                         }
 158                 }
 159
 160                 public bool IsOut {
 161                         get {
 162                                 return (Attributes & ParameterAttributes.Out) != 0;
 163                         }
 164                 }
 165
 166                 public bool IsRetval {
 167                         get {
 168                                 return (Attributes & ParameterAttributes.Retval) != 0;
 169                         }
 170                 }
 171
 172                 public virtual MemberInfo Member {
 173                         get {return MemberImpl;}
 174                 }
 175
 176                 public virtual string Name {
 177                         get {return NameImpl;}
 178                 }
 179
 180                 public virtual int Position {
 181                         get {return PositionImpl;}
 182                 }
 183
 184                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 185                 extern int GetMetadataToken ();
 186
 187                 public int MetadataToken {
 188                         get {
 189                                 if (MemberImpl is PropertyInfo) {
 190                                         PropertyInfo prop = (PropertyInfo)MemberImpl;
 191                                         MethodInfo mi = prop.GetGetMethod (true);
 192                                         if (mi == null)
 193                                                 mi = prop.GetSetMethod (true);
 194                                         /*TODO expose and use a GetParametersNoCopy()*/
 195                                         return mi.GetParameters () [PositionImpl].MetadataToken;
 196                                 } else if (MemberImpl is MethodBase) {
 197                                         return GetMetadataToken ();
 198                                 }
 199                                 throw new ArgumentException ("Can't produce MetadataToken for member of type " + MemberImpl.GetType ());
 200                         }
 201                 }
 202
 203                 public virtual object[] GetCustomAttributes (bool inherit)
 204                 {
 205                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 206                 }
 207
 208                 public virtual object[] GetCustomAttributes (Type attributeType, bool inherit)
 209                 {
 210                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 211                 }
 212
 213                 public virtual bool IsDefined( Type attributeType, bool inherit) {
 214                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
 215                 }
 216
 217                 internal object[] GetPseudoCustomAttributes () {
 218                         int count = 0;
 219
 220                         if (IsIn)
 221                                 count ++;
 222                         if (IsOut)
 223                                 count ++;
 224                         if (IsOptional)
 225                                 count ++;
 226                         if (marshalAs != null)
 227                                 count ++;
 228
 229                         if (count == 0)
 230                                 return null;
 231                         object[] attrs = new object [count];
 232                         count = 0;
 233
 234                         if (IsIn)
 235                                 attrs [count ++] = new InAttribute ();
 236                         if (IsOptional)
 237                                 attrs [count ++] = new OptionalAttribute ();
 238                         if (IsOut)
 239                                 attrs [count ++] = new OutAttribute ();
 240
 241                         if (marshalAs != null)
 242                                 attrs [count ++] = marshalAs.ToMarshalAsAttribute ();
 243
 244                         return attrs;
 245                 }
 246
 247                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 248                 extern Type[] GetTypeModifiers (bool optional);
 249
 250                 public virtual Type[] GetOptionalCustomModifiers () {
 251                         Type[] types = GetTypeModifiers (true);
 252                         if (types == null)
 253                                 return Type.EmptyTypes;
 254                         return types;
 255                 }
 256
 257                 public virtual Type[] GetRequiredCustomModifiers () {
 258                         Type[] types = GetTypeModifiers (false);
 259                         if (types == null)
 260                                 return Type.EmptyTypes;
 261                         return types;
 262                 }
 263
 264                 public virtual object RawDefaultValue {
 265                         get {
 266                                 /*FIXME right now DefaultValue doesn't throw for reflection-only assemblies. Change this once the former is fixed.*/
 267                                 return DefaultValue;
 268                         }
 269                 }
 270
 271 #if NET_4_0
 272                 public virtual IList<CustomAttributeData> GetCustomAttributesData () {
 273                         return CustomAttributeData.GetCustomAttributes (this);
 274                 }
 275 #endif
 276
 277                 void _ParameterInfo.GetIDsOfNames ([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 278                 {
 279                         throw new NotImplementedException ();
 280                 }
 281
 282                 void _ParameterInfo.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 283                 {
 284                         throw new NotImplementedException ();
 285                 }
 286
 287                 void _ParameterInfo.GetTypeInfoCount (out uint pcTInfo)
 288                 {
 289                         throw new NotImplementedException ();
 290                 }
 291
 292                 void _ParameterInfo.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams,
 293                         IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 294                 {
 295                         throw new NotImplementedException ();
 296                 }
 297         }
 298 }