mcs/class/System/System.ComponentModel/ExtenderProvidedPropertyAttribute.cs

   1 //
   2 // System.ComponentModel.ExtenderProvidedPropertyAttribute.cs
   3 //
   4 // Author:
   5 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   6 //
   7 // (C) 2003 Andreas Nahr
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32
  33 namespace System.ComponentModel
  34 {
  35
  36         [AttributeUsage(AttributeTargets.All)]
  37         public sealed class ExtenderProvidedPropertyAttribute : Attribute
  38         {
  39                 private PropertyDescriptor extender;
  40                 private IExtenderProvider extenderProvider;
  41                 private Type receiver;
  42
  43                 public ExtenderProvidedPropertyAttribute()
  44                 {
  45                 }
  46
  47                 // Call this method to create a ExtenderProvidedPropertyAttribute and set it's values
  48                 internal static ExtenderProvidedPropertyAttribute CreateAttribute (PropertyDescriptor extenderProperty, IExtenderProvider provider, Type receiverType)
  49                 {
  50                         ExtenderProvidedPropertyAttribute NewAttribute = new ExtenderProvidedPropertyAttribute();
  51                         NewAttribute.extender = extenderProperty;
  52                         NewAttribute.receiver = receiverType;
  53                         NewAttribute.extenderProvider = provider;
  54                         return NewAttribute;
  55                 }
  56
  57                 public PropertyDescriptor ExtenderProperty {
  58                         get {
  59                                 return extender;
  60                         }
  61                 }
  62
  63                 public IExtenderProvider Provider {
  64                         get {
  65                                 return extenderProvider;
  66                         }
  67                 }
  68
  69                 public Type ReceiverType {
  70                         get {
  71                                 return receiver;
  72                         }
  73                 }
  74
  75                 public override bool IsDefaultAttribute()
  76                 {
  77                         // FIXME correct implementation??
  78                         return (extender == null) &&
  79                         (extenderProvider == null) &&
  80                         (receiver == null);
  81                 }
  82
  83                 public override bool Equals (object obj)
  84                 {
  85                         if (!(obj is ExtenderProvidedPropertyAttribute))
  86                                 return false;
  87                         if (obj == this)
  88                                 return true;
  89                         return ((ExtenderProvidedPropertyAttribute) obj).ExtenderProperty.Equals (extender) &&
  90                         ((ExtenderProvidedPropertyAttribute) obj).Provider.Equals (extenderProvider) &&
  91                         ((ExtenderProvidedPropertyAttribute) obj).ReceiverType.Equals (receiver);
  92                 }
  93
  94                 public override int GetHashCode()
  95                 {
  96                         return extender.GetHashCode() ^ extenderProvider.GetHashCode() ^ receiver.GetHashCode();
  97                 }
  98         }
  99 }