class/System.XML/System.Xml.Serialization/ReflectionHelper.cs

   1 //
   2 // System.Xml.Serialization.ReflectionHelper
   3 //
   4 // Author:
   5 //   Lluis Sanchez Gual (lluis@ximian.com)
   6 //
   7 // Copyright (C) 2003 Ximian, Inc.
   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.Reflection;
  32 using System.Collections;
  33
  34 namespace System.Xml.Serialization
  35 {
  36         internal class ReflectionHelper
  37         {
  38                 Hashtable _clrTypes = new Hashtable ();
  39                 Hashtable _schemaTypes = new Hashtable ();
  40
  41                 public void RegisterSchemaType (XmlTypeMapping map, string xmlType, string ns)
  42                 {
  43                         string mapKey = xmlType + "/" + ns;
  44                         if (!_schemaTypes.ContainsKey (mapKey))
  45                                 _schemaTypes.Add (mapKey, map);
  46                 }
  47
  48                 public XmlTypeMapping GetRegisteredSchemaType (string xmlType, string ns)
  49                 {
  50                         string mapKey = xmlType + "/" + ns;
  51                         return _schemaTypes[mapKey] as XmlTypeMapping;
  52                 }
  53
  54                 public void RegisterClrType (XmlTypeMapping map, Type type, string ns)
  55                 {
  56                         if (type == typeof(object)) ns = "";
  57                         string mapKey = type.FullName + "/" + ns;
  58                         if (!_clrTypes.ContainsKey (mapKey))
  59                                 _clrTypes.Add (mapKey, map);
  60                 }
  61
  62                 public XmlTypeMapping GetRegisteredClrType (Type type, string ns)
  63                 {
  64                         if (type == typeof(object)) ns = "";
  65                         string mapKey = type.FullName + "/" + ns;
  66                         return _clrTypes[mapKey] as XmlTypeMapping;
  67                 }
  68
  69                 public Exception CreateError (XmlTypeMapping map, string message)
  70                 {
  71                         return new InvalidOperationException ("There was an error reflecting '" + map.TypeFullName + "': " + message);
  72                 }
  73
  74 #if NET_2_0
  75                 static readonly ParameterModifier [] empty_modifiers = new ParameterModifier [0];
  76 #endif
  77
  78                 public static void CheckSerializableType (Type type, bool allowPrivateConstructors)
  79                 {
  80                         if (type.IsArray) return;
  81
  82 #if NET_2_0
  83                         if (!allowPrivateConstructors && type.GetConstructor (BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, empty_modifiers) == null && !type.IsAbstract && !type.IsValueType)
  84 #else
  85                         if (!allowPrivateConstructors && type.GetConstructor (Type.EmptyTypes) == null && !type.IsAbstract && !type.IsValueType)
  86 #endif
  87                                 throw new InvalidOperationException (type.FullName + " cannot be serialized because it does not have a default public constructor");
  88
  89                         if (type.IsInterface && !TypeTranslator.GetTypeData (type).IsListType)
  90                                 throw new InvalidOperationException (type.FullName + " cannot be serialized because it is an interface");
  91
  92                         Type t = type;
  93                         Type oldt = null;
  94                         do {
  95                                 if (!t.IsPublic && !t.IsNestedPublic)
  96                                         throw new InvalidOperationException (type.FullName + " is inaccessible due to its protection level. Only public types can be processed");
  97                                 oldt = t;
  98                                 t = t.DeclaringType;
  99                         }
 100                         while (t != null && t != oldt);
 101                 }
 102
 103                 public static string BuildMapKey (Type type)
 104                 {
 105                         return type.FullName + "::";
 106                 }
 107
 108                 public static string BuildMapKey (MethodInfo method, string tag)
 109                 {
 110                         string res = method.DeclaringType.FullName + ":" + method.ReturnType.FullName + " " + method.Name + "(";
 111
 112                         ParameterInfo[] pars = method.GetParameters ();
 113
 114                         for (int n=0; n<pars.Length; n++)
 115                         {
 116                                 if (n > 0) res += ", ";
 117                                 res += pars[n].ParameterType.FullName;
 118                         }
 119                         res += ")";
 120
 121                         if (tag != null)
 122                                 res += ":" + tag;
 123
 124                         return res;
 125                 }
 126         }
 127 }