2 // KnownTypeAttribute.cs
5 // Atsushi Enomoto <atsushi@ximian.com>
7 // Copyright (C) 2005 Novell, Inc. http://www.novell.com
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 using System.Collections.Generic;
30 using System.Reflection;
32 namespace System.Runtime.Serialization
34 [AttributeUsage (AttributeTargets.Class | AttributeTargets.Struct,
35 Inherited = true, AllowMultiple = true)]
36 public sealed class KnownTypeAttribute : Attribute
41 public KnownTypeAttribute (string methodName)
43 if (methodName == null)
44 throw new ArgumentNullException ("methodName");
45 method_name = methodName;
48 public KnownTypeAttribute (Type type)
51 throw new ArgumentNullException ("type");
55 public string MethodName {
56 get { return method_name; }
63 MethodInfo method_cache;
65 internal IEnumerable<Type> GetTypes (Type type)
67 if (method_cache != null)
68 return (IEnumerable<Type>) method_cache.Invoke (null, new object [0]);
71 return new Type [] {Type};
73 var mi = type.GetMethod (MethodName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static, null, Type.EmptyTypes, null);
75 throw new InvalidDataContractException (String.Format ("KnownTypeAttribute on {0} specifies '{1}' method, but that does not exist. The methos must be static.", type, MethodName));
76 if (!typeof (IEnumerable<Type>).IsAssignableFrom (mi.ReturnType))
77 throw new InvalidDataContractException (String.Format ("KnownTypeAttribute on {0} specifies '{1}' method, but it returns {2} which cannot be assignable from IEnumerable<Type>.", type, MethodName, mi.ReturnType));
79 return GetTypes (type);