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
   7 //
   8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Reflection.Emit;
  31 using System.Runtime.CompilerServices;
  32 using System.Runtime.InteropServices;
  33
  34 namespace System.Reflection
  35 {
  36         [Serializable]
  37         public class ParameterInfo : ICustomAttributeProvider
  38         {
  39                 protected Type ClassImpl;
  40                 protected object DefaultValueImpl;
  41                 protected MemberInfo MemberImpl;
  42                 protected string NameImpl;
  43                 protected int PositionImpl;
  44                 protected ParameterAttributes AttrsImpl;
  45                 private UnmanagedMarshal marshalAs;
  46
  47                 protected ParameterInfo () {
  48                 }
  49
  50                 internal ParameterInfo (ParameterBuilder pb, Type type, MemberInfo member, int position) {
  51                         this.ClassImpl = type;
  52                         this.MemberImpl = member;
  53                         if (pb != null) {
  54                                 this.NameImpl = pb.Name;
  55                                 this.PositionImpl = pb.Position - 1;    // ParameterInfo.Position is zero-based
  56                                 this.AttrsImpl = (ParameterAttributes) pb.Attributes;
  57                         } else {
  58                                 this.NameImpl = "";
  59                                 this.PositionImpl = position - 1;
  60                                 this.AttrsImpl = ParameterAttributes.None;
  61                         }
  62                 }
  63
  64                 /* to build a ParameterInfo for the return type of a method */
  65                 internal ParameterInfo (Type type, MemberInfo member) {
  66                         this.ClassImpl = type;
  67                         this.MemberImpl = member;
  68                         this.NameImpl = "";
  69                         this.PositionImpl = -1; // since parameter positions are zero-based, return type pos is -1
  70                         this.AttrsImpl = ParameterAttributes.Retval;
  71                 }
  72
  73                 public virtual Type ParameterType {
  74                         get {return ClassImpl;}
  75                 }
  76                 public virtual ParameterAttributes Attributes {
  77                         get {return AttrsImpl;}
  78                 }
  79                 public virtual object DefaultValue {
  80                         get {return DefaultValueImpl;}
  81                 }
  82
  83                 public bool IsIn {
  84                         get {return (AttrsImpl & ParameterAttributes.In) != 0;}
  85                 }
  86
  87                 public bool IsLcid {
  88                         get {return (AttrsImpl & ParameterAttributes.Lcid) != 0;}
  89                 }
  90
  91                 public bool IsOptional {
  92                         get {return (AttrsImpl & ParameterAttributes.Optional) != 0;}
  93                 }
  94
  95                 public bool IsOut {
  96                         get {return (AttrsImpl & ParameterAttributes.Out) != 0;}
  97                 }
  98
  99                 public bool IsRetval {
 100                         get {return (AttrsImpl & ParameterAttributes.Retval) != 0;}
 101                 }
 102
 103                 public virtual MemberInfo Member {
 104                         get {return MemberImpl;}
 105                 }
 106
 107                 public virtual string Name {
 108                         get {return NameImpl;}
 109                 }
 110
 111                 public virtual int Position {
 112                         get {return PositionImpl;}
 113                 }
 114
 115 #if NET_2_0 || BOOTSTRAP_NET_2_0
 116                 public
 117 #else
 118                 internal
 119 #endif
 120                 virtual extern int MetadataToken {
 121                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 122                         get;
 123                 }
 124
 125                 public virtual object[] GetCustomAttributes (bool inherit)
 126                 {
 127                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 128                 }
 129
 130                 public virtual object[] GetCustomAttributes (Type attributeType, bool inherit)
 131                 {
 132                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 133                 }
 134
 135                 public virtual bool IsDefined( Type attributeType, bool inherit) {
 136                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
 137                 }
 138
 139                 internal object[] GetPseudoCustomAttributes () {
 140                         int count = 0;
 141
 142                         if (IsIn)
 143                                 count ++;
 144                         if (IsOut)
 145                                 count ++;
 146                         if (IsOptional)
 147                                 count ++;
 148                         if (marshalAs != null)
 149                                 count ++;
 150
 151                         if (count == 0)
 152                                 return null;
 153                         object[] attrs = new object [count];
 154                         count = 0;
 155
 156                         if (IsIn)
 157                                 attrs [count ++] = new InAttribute ();
 158                         if (IsOptional)
 159                                 attrs [count ++] = new OptionalAttribute ();
 160                         if (IsOut)
 161                                 attrs [count ++] = new OutAttribute ();
 162
 163                         if (marshalAs != null)
 164                                 attrs [count ++] = marshalAs.ToMarshalAsAttribute ();
 165
 166                         return attrs;
 167                 }
 168
 169 #if NET_2_0 || BOOTSTRAP_NET_2_0
 170                 [MonoTODO]
 171                 public virtual Type[] OptionalCustomModifiers {
 172                         get {
 173                                 throw new NotImplementedException ();
 174                         }
 175                 }
 176
 177                 [MonoTODO]
 178                 public virtual Type[] RequiredCustomModifiers {
 179                         get {
 180                                 throw new NotImplementedException ();
 181                         }
 182                 }
 183 #endif
 184         }
 185 }