mcs/class/System.ComponentModel.DataAnnotations/System.ComponentModel.DataAnnotations/ValidationContext.cs

   1 //
   2 // ValidationContext.cs
   3 //
   4 // Authors:
   5 //      Marek Habersack <mhabersack@novell.com>
   6 //
   7 // Copyright (C) 2010 Novell Inc. (http://novell.com)
   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 using System;
  31 using System.Collections.Generic;
  32 using System.ComponentModel.Design;
  33
  34 namespace System.ComponentModel.DataAnnotations
  35 {
  36         public sealed class ValidationContext : IServiceProvider
  37         {
  38                 public string DisplayName { get; set; }
  39                 public IDictionary <object, object> Items { get; private set; }
  40                 public string MemberName { get; set; }
  41                 public object ObjectInstance { get; private set; }
  42                 public Type ObjectType { get; private set; }
  43                 public IServiceContainer ServiceContainer { get; private set; }
  44
  45                 public ValidationContext (object instance, IServiceProvider serviceProvider, IDictionary<object, object> items)
  46                 {
  47                         if (instance == null)
  48                                 throw new ArgumentNullException ("instance");
  49
  50                         ObjectInstance = instance;
  51                         ObjectType = instance.GetType ();
  52                         if (items != null)
  53                                 Items = new Dictionary <object, object> (items);
  54                         else
  55                                 Items = new Dictionary <object, object> ();
  56
  57                         DisplayName = instance.GetType ().Name;
  58
  59                         // LAMESPEC: MSDN says vc.ServiceContainer should be initialized with the passed container if it implements
  60                         // the IServiceContainer interface - not the case, though.
  61                         //
  62                         // IServiceContainer container = serviceProvider as IServiceContainer;
  63                         // if (container != null)
  64                         //      ServiceContainer = container;
  65                         // else
  66                         ServiceContainer = new ValidationContextServiceContainer ();
  67                 }
  68
  69                 public object GetService (Type serviceType)
  70                 {
  71                         return ServiceContainer.GetService (serviceType);
  72                 }
  73
  74                 sealed class ValidationContextServiceContainer : IServiceContainer
  75                 {
  76                         Dictionary <Type, object> services = new Dictionary <Type, object> ();
  77
  78                         public void AddService (Type serviceType, ServiceCreatorCallback callback, bool promote)
  79                         {
  80                                 AddService (serviceType, (object)callback, promote);
  81                         }
  82
  83                         public void AddService (Type serviceType, ServiceCreatorCallback callback)
  84                         {
  85                                 AddService (serviceType, callback, false);
  86                         }
  87
  88                         public void AddService (Type serviceType, object serviceInstance, bool promote)
  89                         {
  90                                 if (serviceType == null)
  91                                         throw new ArgumentNullException ("serviceType");
  92
  93                                 if (services.ContainsKey (serviceType))
  94                                         throw new ArgumentException (
  95                                                 String.Format ("A service of type '{0}' already exists in the container.", serviceType)
  96                                         );
  97
  98                                 services.Add (serviceType, serviceInstance);
  99                         }
 100
 101                         public void AddService (Type serviceType, object serviceInstance)
 102                         {
 103                                 AddService (serviceType, serviceInstance, false);
 104                         }
 105
 106                         public void RemoveService (Type serviceType, bool promote)
 107                         {
 108                                 if (serviceType == null)
 109                                         throw new ArgumentNullException ("serviceType");
 110
 111                                 if (!services.ContainsKey (serviceType))
 112                                         return;
 113
 114                                 services.Remove (serviceType);
 115                         }
 116
 117                         public void RemoveService (Type serviceType)
 118                         {
 119                                 RemoveService (serviceType, false);
 120                         }
 121
 122                         public object GetService (Type serviceType)
 123                         {
 124                                 if (serviceType == null)
 125                                         throw new ArgumentNullException ("serviceType");
 126
 127                                 object o;
 128                                 if (!services.TryGetValue (serviceType, out o))
 129                                         return null;
 130
 131                                 var cb = o as ServiceCreatorCallback;
 132                                 if (cb != null)
 133                                         return cb (this, serviceType);
 134
 135                                 return o;
 136                         }
 137                 }
 138         }
 139 }