mcs/class/System/System.ComponentModel/CultureInfoConverter.cs

   1 //
   2 // System.ComponentModel.CultureInfoConverter
   3 //
   4 // Authors:
   5 //  Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //  Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //  Ivan N. Zlatev <contact@i-nz.net>
   8 //
   9 // (C) 2003 Martin Willemoes Hansen
  10 // (C) 2003 Andreas Nahr
  11 // (C) 2008 Novell, Inc. (http://www.novell.com)
  12 //
  13
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System.Collections;
  36 using System.Globalization;
  37 using System.Reflection;
  38 using System.ComponentModel.Design.Serialization;
  39
  40 namespace System.ComponentModel
  41 {
  42         public class CultureInfoConverter : TypeConverter
  43         {
  44                 private class CultureInfoComparer : IComparer
  45                 {
  46                         public int Compare (object first,  object second)
  47                         {
  48                                 if (first == null) {
  49                                         if (second == null)
  50                                                 return 0;
  51                                         else
  52                                                 return -1;
  53                                 }
  54                                 if (second == null)
  55                                         return 1;
  56
  57                                 return String.Compare (((CultureInfo)first).DisplayName, ((CultureInfo)second).DisplayName,
  58                                                        false, CultureInfo.CurrentCulture);
  59                         }
  60                 }
  61
  62                 private StandardValuesCollection _standardValues;
  63
  64                 public CultureInfoConverter()
  65                 {
  66                 }
  67
  68                 public override bool CanConvertFrom (ITypeDescriptorContext context,
  69                         Type sourceType)
  70                 {
  71                         if (sourceType == typeof (string))
  72                                 return true;
  73                         return base.CanConvertFrom (context, sourceType);
  74                 }
  75
  76                 public override bool CanConvertTo (ITypeDescriptorContext context,
  77                         Type destinationType)
  78                 {
  79                         if (destinationType == typeof (string))
  80                                 return true;
  81                         if (destinationType == typeof (InstanceDescriptor))
  82                                 return true;
  83                         return base.CanConvertTo (context, destinationType);
  84                 }
  85
  86                 public override object ConvertFrom (ITypeDescriptorContext context,
  87                         CultureInfo culture, object value)
  88                 {
  89                         string culture_string = value as string;
  90                         if (culture_string != null) {
  91                                 if (String.Compare (culture_string, "(Default)", false) == 0)
  92                                         return CultureInfo.InvariantCulture;
  93
  94                                 try {
  95                                         // try to create a new CultureInfo if form is RFC 1766
  96                                         return new CultureInfo (culture_string);
  97                                 } catch {
  98                                         // try to create a new CultureInfo if form is verbose name
  99                                         foreach (CultureInfo CI in CultureInfo.GetCultures (CultureTypes.AllCultures))
 100                                                 if (string.Compare (CI.DisplayName, 0, culture_string, 0, culture_string.Length, true) == 0)
 101                                                         return CI;
 102                                 }
 103                                 throw new ArgumentException (string.Format (
 104                                         "Culture {0} cannot be converted to a " +
 105                                         "CultureInfo or is not available in " +
 106                                         "this environment.", value));
 107                         }
 108                         return base.ConvertFrom (context, culture, value);
 109                 }
 110
 111                 public override object ConvertTo (ITypeDescriptorContext context,
 112                                                   CultureInfo culture, object value, Type destinationType)
 113                 {
 114                         if (destinationType == typeof (string)) {
 115                                 if (value != null && (value is CultureInfo)) {
 116                                         if (value == CultureInfo.InvariantCulture)
 117                                                 return "(Default)";
 118                                         else
 119                                                 return ((CultureInfo) value).DisplayName;
 120                                 } else {
 121                                         return "(Default)";
 122                                 }
 123                         }
 124                         if (destinationType == typeof (InstanceDescriptor) && value is CultureInfo) {
 125                                 CultureInfo cval = (CultureInfo) value;
 126                                 ConstructorInfo ctor = typeof(CultureInfo).GetConstructor (new Type[] {typeof(int)});
 127                                 return new InstanceDescriptor (ctor, new object[] {cval.LCID});
 128                         }
 129                         return base.ConvertTo (context, culture, value, destinationType);
 130                 }
 131
 132                 public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
 133                 {
 134                         if (_standardValues == null) {
 135                                 CultureInfo[] cultures = CultureInfo.GetCultures (CultureTypes.AllCultures);
 136                                 Array.Sort (cultures, new CultureInfoComparer ());
 137                                 CultureInfo[] stdValues = new CultureInfo[cultures.Length + 1];
 138                                 stdValues[0] = CultureInfo.InvariantCulture;
 139                                 Array.Copy (cultures, 0, stdValues, 1, cultures.Length);
 140                                 _standardValues = new StandardValuesCollection (stdValues);
 141                         }
 142                         return _standardValues;
 143                 }
 144
 145                 public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
 146                 {
 147                         return false;
 148                 }
 149
 150                 public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
 151                 {
 152                         return true;
 153                 }
 154
 155 #if NET_4_0
 156                 protected virtual string GetCultureName (CultureInfo culture)
 157                 {
 158                         // .Net doesn't throw ArgumentNullException here, ugh.
 159                         return culture.Name;
 160                 }
 161 #endif
 162
 163         }
 164 }