class/System.Xaml/System.Windows.Markup/TypeExtension.cs

   1 //
   2 // Copyright (C) 2010 Novell Inc. http://novell.com
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 using System;
  24 using System.Collections.Generic;
  25 using System.ComponentModel;
  26 using System.Reflection;
  27 using System.Xaml.Schema;
  28
  29 namespace System.Windows.Markup
  30 {
  31         [MarkupExtensionReturnType (typeof (Type))]
  32         [TypeConverter (typeof (TypeExtensionConverter))]
  33         [System.Runtime.CompilerServices.TypeForwardedFrom (Consts.AssemblyPresentationFramework_3_5)]
  34         public class TypeExtension : MarkupExtension
  35         {
  36                 public TypeExtension ()
  37                 {
  38                 }
  39
  40                 public TypeExtension (string typeName)
  41                 {
  42                         if (typeName == null)
  43                                 throw new ArgumentNullException ("typeName");
  44                         TypeName = typeName;
  45                 }
  46
  47                 public TypeExtension (Type type)
  48                 {
  49                         if (type == null)
  50                                 throw new ArgumentNullException ("type");
  51                         Type = type;
  52                 }
  53
  54                 [ConstructorArgument ("type")]
  55                 [DefaultValue (null)]
  56                 public Type Type { get; set; }
  57                 public string TypeName { get; set; }
  58
  59                 public override object ProvideValue (IServiceProvider serviceProvider)
  60                 {
  61                         if (Type != null)
  62                                 return Type;
  63
  64                         if (TypeName == null)
  65                                 throw new InvalidOperationException ("Either TypeName or Type must be filled before calling ProvideValue method");
  66
  67                         if (serviceProvider == null) // it can be null when Type is supplied.
  68                                 throw new ArgumentNullException ("serviceProvider");
  69
  70                         var p = serviceProvider.GetService (typeof (IXamlTypeResolver)) as IXamlTypeResolver;
  71                         if (p == null)
  72                                 throw new InvalidOperationException ("serviceProvider does not provide IXamlTypeResolver service.");
  73
  74                         var ret = p.Resolve (TypeName);
  75                         if (ret == null)
  76                                 throw new InvalidOperationException (String.Format ("Type '{0}' is not resolved as a valid type by the type resolver '{1}'.", TypeName, p.GetType ()));
  77                         return ret;
  78                 }
  79         }
  80 }