class/corlib/System.Reflection/CustomAttributeTypedArgument.cs

   1 //
   2 // System.Reflection/CustomAttributeTypedArgument.cs
   3 //
   4 // Author:
   5 //   Zoltan Varga (vargaz@gmail.com)
   6 //   Carlos Alberto Cortez (calberto.cortez@gmail.com)
   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
  31 using System;
  32 using System.Runtime.InteropServices;
  33 using System.Collections.ObjectModel;
  34
  35 namespace System.Reflection {
  36
  37         [ComVisible (true)]
  38         [Serializable]
  39         public struct CustomAttributeTypedArgument {
  40                 Type argumentType;
  41                 object value;
  42
  43                 internal CustomAttributeTypedArgument (Type argumentType, object value)
  44                 {
  45                         this.argumentType = argumentType;
  46                         this.value = value;
  47
  48                         // MS seems to convert arrays into a ReadOnlyCollection
  49                         if (value is Array) {
  50                                 Array a = (Array)value;
  51
  52                                 Type etype = a.GetType ().GetElementType ();
  53                                 CustomAttributeTypedArgument[] new_value = new CustomAttributeTypedArgument [a.GetLength (0)];
  54                                 for (int i = 0; i < new_value.Length; ++i)
  55                                         new_value [i] = new CustomAttributeTypedArgument (etype, a.GetValue (i));
  56                                 this.value = new ReadOnlyCollection <CustomAttributeTypedArgument> (new_value);
  57                         }
  58                 }
  59
  60                 public Type ArgumentType {
  61                         get {
  62                                 return argumentType;
  63                         }
  64                 }
  65
  66                 public object Value {
  67                         get {
  68                                 return value;
  69                         }
  70                 }
  71
  72                 public override string ToString ()
  73                 {
  74                         string val = value != null ? value.ToString () : String.Empty;
  75                         if (argumentType == typeof (string))
  76                                 return "\"" + val + "\"";
  77                         if (argumentType == typeof (Type))
  78                                 return "typeof (" + val + ")";
  79                         if (argumentType.IsEnum)
  80                                 return "(" + argumentType.Name + ")" + val;
  81
  82                         return val;
  83                 }
  84
  85                 public override bool Equals (object obj)
  86                 {
  87                         if (!(obj is CustomAttributeTypedArgument))
  88                                 return false;
  89                         CustomAttributeTypedArgument other = (CustomAttributeTypedArgument) obj;
  90                         return  other.argumentType == argumentType &&
  91                                 value != null ? value.Equals (other.value) : (object) other.value == null;
  92                 }
  93
  94                 public override int GetHashCode ()
  95                 {
  96                         return (argumentType.GetHashCode () << 16) + (value != null ? value.GetHashCode () : 0);
  97                 }
  98
  99                 public static bool operator == (CustomAttributeTypedArgument left, CustomAttributeTypedArgument right)
 100                 {
 101                         return left.Equals (right);
 102                 }
 103
 104                 public static bool operator != (CustomAttributeTypedArgument left, CustomAttributeTypedArgument right)
 105                 {
 106                         return !left.Equals (right);
 107                 }
 108         }
 109
 110 }
 111
 112