mcs/class/Managed.Windows.Forms/System.Resources/TypeConverterFromResXHandler.cs

   1 //
   2 // TypeConverterFromResXHandler.cs : Handles a resource that was stored
   3 // in a resx file by means of a typeconverter associated with the
   4 // resources type.
   5 //
   6 // Author:
   7 //      Gary Barnett (gary.barnett.mono@gmail.com)
   8 //
   9 // Copyright (C) Gary Barnett (2012)
  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.Reflection;
  32 using System.ComponentModel.Design;
  33 using System.ComponentModel;
  34
  35 namespace System.Resources {
  36         internal class TypeConverterFromResXHandler : ResXDataNodeHandler, IWritableHandler {
  37
  38                 string dataString;
  39                 string mime_type;
  40                 string typeString;
  41
  42                 public TypeConverterFromResXHandler (string data, string _mime_type, string _typeString)
  43                 {
  44                         dataString = data;
  45                         mime_type = _mime_type;
  46                         typeString = _typeString;
  47                 }
  48
  49                 #region implemented abstract members of System.Resources.ResXDataNodeHandler
  50                 public override object GetValue (ITypeResolutionService typeResolver)
  51                 {
  52                         if (!String.IsNullOrEmpty(mime_type)
  53                             && mime_type != ResXResourceWriter.ByteArraySerializedObjectMimeType)
  54                                 return null;
  55
  56                         Type type = ResolveType (typeString, typeResolver);
  57                         if (type == null)
  58                                 throw new TypeLoadException();
  59
  60                         TypeConverter c = TypeDescriptor.GetConverter (type);
  61                         if (c == null)
  62                                 throw new TypeLoadException();
  63
  64                         return ConvertData (c);
  65                 }
  66
  67                 public override object GetValue (AssemblyName[] assemblyNames)
  68                 {
  69                         if (!String.IsNullOrEmpty(mime_type)
  70                             && mime_type != ResXResourceWriter.ByteArraySerializedObjectMimeType)
  71                                 return null;
  72
  73                         Type type = ResolveType (typeString, assemblyNames);
  74                         if (type == null)
  75                                 throw new TypeLoadException();
  76
  77                         TypeConverter c = TypeDescriptor.GetConverter (type);
  78                         if (c == null)
  79                                 throw new TypeLoadException();
  80
  81                         return ConvertData (c);
  82                 }
  83
  84                 public override string GetValueTypeName (ITypeResolutionService typeResolver)
  85                 {
  86                         Type type = ResolveType (typeString, typeResolver);
  87
  88                         if (type == null)
  89                                 return typeString;
  90                         else
  91                                 return type.AssemblyQualifiedName;
  92                 }
  93
  94                 public override string GetValueTypeName (AssemblyName [] assemblyNames)
  95                 {
  96                         Type type = ResolveType (typeString, assemblyNames);
  97
  98                         if (type == null)
  99                                 return typeString;
 100                         else
 101                                 return type.AssemblyQualifiedName;
 102                 }
 103                 #endregion
 104
 105                 #region IWritableHandler implementation
 106                 public string DataString {
 107                         get {
 108                                 return dataString;
 109                         }
 110                 }
 111                 #endregion
 112
 113                 object ConvertData (TypeConverter c)
 114                 {
 115                         if (mime_type == ResXResourceWriter.ByteArraySerializedObjectMimeType) {
 116                                 if (c.CanConvertFrom (typeof (byte [])))
 117                                         return c.ConvertFrom (Convert.FromBase64String (dataString));
 118                         } else if (String.IsNullOrEmpty (mime_type)) {
 119                                 if (c.CanConvertFrom (typeof (string)))
 120                                         return c.ConvertFromInvariantString (dataString);
 121                         }
 122                         else
 123                                 throw new Exception ("shouldnt get here, invalid mime type");
 124
 125                         throw new TypeLoadException ("No converter for this type found");
 126                 }
 127
 128         }
 129 }
 130