class/System.Xaml/System.Windows.Markup/ValueSerializer.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;
  25 using System.Collections.Generic;
  26 using System.ComponentModel;
  27 using System.Reflection;
  28 using System.Xaml;
  29
  30 namespace System.Windows.Markup
  31 {
  32         [System.Runtime.CompilerServices.TypeForwardedFrom (Consts.AssemblyWindowsBase)]
  33         public abstract class ValueSerializer
  34         {
  35                 public static ValueSerializer GetSerializerFor (PropertyDescriptor descriptor)
  36                 {
  37                         return GetSerializerFor (descriptor, null);
  38                 }
  39
  40                 public static ValueSerializer GetSerializerFor (Type type)
  41                 {
  42                         return GetSerializerFor (type, null);
  43                 }
  44
  45                 public static ValueSerializer GetSerializerFor (PropertyDescriptor descriptor, IValueSerializerContext context)
  46                 {
  47                         throw new NotImplementedException ();
  48                 }
  49
  50                 [MonoTODO ("IValueSerializerContext parameter is not supported")]
  51                 public static ValueSerializer GetSerializerFor (Type type, IValueSerializerContext context)
  52                 {
  53                         if (type == null)
  54                                 throw new ArgumentNullException ("type");
  55
  56                         // FIXME: it is likely a hack.
  57                         if (Type.GetTypeCode (type) != TypeCode.Object)
  58                                 return new TypeConverterValueSerializer (type);
  59                         if (type == typeof (TimeSpan))
  60                                 return new TypeConverterValueSerializer (typeof (TimeSpan));
  61                         if (type == typeof (Uri))
  62                                 return new TypeConverterValueSerializer (typeof (Uri));
  63                         return null;
  64                 }
  65
  66                 // instance members
  67
  68                 public virtual bool CanConvertFromString (string value, IValueSerializerContext context)
  69                 {
  70                         return false;
  71                 }
  72
  73                 public virtual bool CanConvertToString (object value, IValueSerializerContext context)
  74                 {
  75                         return false;
  76                 }
  77
  78                 public virtual object ConvertFromString (string value, IValueSerializerContext context)
  79                 {
  80                         throw new NotSupportedException (String.Format ("Conversion from string '{0}' is not supported", value));
  81                 }
  82
  83                 public virtual string ConvertToString (object value,     IValueSerializerContext context)
  84                 {
  85                         throw new NotSupportedException (String.Format ("Conversion from '{0}' to string is not supported", value != null ? value.GetType ().Name : "(null)"));
  86                 }
  87
  88                 protected Exception GetConvertFromException (object value)
  89                 {
  90                         throw new NotImplementedException ();
  91                 }
  92
  93                 protected Exception GetConvertToException (object value, Type destinationType)
  94                 {
  95                         throw new NotImplementedException ();
  96                 }
  97
  98                 public virtual IEnumerable<Type> TypeReferences (object value, IValueSerializerContext context)
  99                 {
 100                         throw new NotImplementedException ();
 101                 }
 102         }
 103
 104         internal class StringValueSerializer : ValueSerializer
 105         {
 106                 public override bool CanConvertFromString (string value, IValueSerializerContext context)
 107                 {
 108                         return true;
 109                 }
 110
 111                 public override bool CanConvertToString (object value, IValueSerializerContext context)
 112                 {
 113                         return true;
 114                 }
 115
 116                 public override object ConvertFromString (string value, IValueSerializerContext context)
 117                 {
 118                         throw new NotImplementedException ();
 119                 }
 120
 121                 public override string ConvertToString (object value,     IValueSerializerContext context)
 122                 {
 123                         return (string) value;
 124                 }
 125
 126                 public override IEnumerable<Type> TypeReferences (object value, IValueSerializerContext context)
 127                 {
 128                         throw new NotImplementedException ();
 129                 }
 130         }
 131
 132         #region Internal implementations.
 133
 134         internal class TypeConverterValueSerializer<T> : TypeConverterValueSerializer
 135         {
 136                 public TypeConverterValueSerializer ()
 137                         : base (typeof (T))
 138                 {
 139                 }
 140         }
 141
 142         internal class TypeConverterValueSerializer : ValueSerializer
 143         {
 144                 public TypeConverterValueSerializer (Type type)
 145                 {
 146                         c = TypeDescriptor.GetConverter (type);
 147                 }
 148
 149                 TypeConverter c;
 150
 151                 public override bool CanConvertFromString (string value, IValueSerializerContext context)
 152                 {
 153                         return c.CanConvertFrom (typeof (string));
 154                 }
 155
 156                 public override bool CanConvertToString (object value, IValueSerializerContext context)
 157                 {
 158                         return c.CanConvertTo (typeof (string));
 159                 }
 160
 161                 public override object ConvertFromString (string value, IValueSerializerContext context)
 162                 {
 163                         return c.ConvertFromInvariantString (value);
 164                 }
 165
 166                 public override string ConvertToString (object value,     IValueSerializerContext context)
 167                 {
 168                         return value == null ? String.Empty : c.ConvertToInvariantString (value);
 169                 }
 170
 171                 public override IEnumerable<Type> TypeReferences (object value, IValueSerializerContext context)
 172                 {
 173                         throw new NotImplementedException ();
 174                 }
 175         }
 176
 177         #endregion
 178 }