CultureInfoConverter.cs :  » 2.6.4-mono-.net-core » System.ComponentModel » System » ComponentModel » C# / CSharp Open Source

//
// System.ComponentModel.CultureInfoConverter
//
// Authors:
//  Martin Willemoes Hansen (mwh@sysrq.dk)
//  Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//  Ivan N. Zlatev <contact@i-nz.net>
//
// (C) 2003 Martin Willemoes Hansen
// (C) 2003 Andreas Nahr
// (C) 2008 Novell, Inc. (http://www.novell.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.Globalization;
using System.Reflection;
using System.ComponentModel.Design.Serialization;

namespace System.ComponentModel{
  public class CultureInfoConverter : TypeConverter
  {
    private class CultureInfoComparer : IComparer
    {
      public int Compare (object first,  object second)
      {
        if (first == null) {
          if (second == null)
            return 0;
          else
            return -1;
        }
        if (second == null)
          return 1;

        return String.Compare (((CultureInfo)first).DisplayName, ((CultureInfo)second).DisplayName, 
                   false, CultureInfo.CurrentCulture);
      }
    }

    private StandardValuesCollection _standardValues;

    public CultureInfoConverter()
    {
    }

    public override bool CanConvertFrom (ITypeDescriptorContext context,
      Type sourceType)
    {
      if (sourceType == typeof (string)) 
        return true;
      return base.CanConvertFrom (context, sourceType);
    }

    public override bool CanConvertTo (ITypeDescriptorContext context,
      Type destinationType)
    {
      if (destinationType == typeof (string))
        return true;
      if (destinationType == typeof (InstanceDescriptor))
        return true;
      return base.CanConvertTo (context, destinationType);
    }

    public override object ConvertFrom (ITypeDescriptorContext context,
      CultureInfo culture, object value)
    {
      string culture_string = value as string;
      if (culture_string != null) {
#if NET_2_0
        if (String.Compare (culture_string, "(Default)", false) == 0)
#else
        if (String.Compare (culture_string, "(Default)", true) == 0)
#endif
          return CultureInfo.InvariantCulture;

        try {
          // try to create a new CultureInfo if form is RFC 1766
          return new CultureInfo (culture_string);
        } catch {
          // try to create a new CultureInfo if form is verbose name
          foreach (CultureInfo CI in CultureInfo.GetCultures (CultureTypes.AllCultures))
            if (string.Compare (CI.DisplayName, 0, culture_string, 0, culture_string.Length, true) == 0)
              return CI;
        }
        throw new ArgumentException (string.Format (
          "Culture {0} cannot be converted to a " +
          "CultureInfo or is not available in " +
          "this environment.", value));
      }
      return base.ConvertFrom (context, culture, value);
    }

    public override object ConvertTo (ITypeDescriptorContext context,
              CultureInfo culture, object value, Type destinationType)
    {
      if (destinationType == typeof (string)) {
        if (value != null && (value is CultureInfo)) {
          if (value == CultureInfo.InvariantCulture)
            return "(Default)";
          else
            return ((CultureInfo) value).DisplayName; 
        } else {
          return "(Default)";
        }
      }
      if (destinationType == typeof (InstanceDescriptor) && value is CultureInfo) {
        CultureInfo cval = (CultureInfo) value;
        ConstructorInfo ctor = typeof(CultureInfo).GetConstructor (new Type[] {typeof(int)});
        return new InstanceDescriptor (ctor, new object[] {cval.LCID});
      }
      return base.ConvertTo (context, culture, value, destinationType);
    }

    public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
    {
      if (_standardValues == null) {
        CultureInfo[] cultures = CultureInfo.GetCultures (CultureTypes.AllCultures);
        Array.Sort (cultures, new CultureInfoComparer ());
        CultureInfo[] stdValues = new CultureInfo[cultures.Length + 1];
        stdValues[0] = CultureInfo.InvariantCulture;
        Array.Copy (cultures, 0, stdValues, 1, cultures.Length);
        _standardValues = new StandardValuesCollection (stdValues);
      }
      return _standardValues;
    }

    public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
    {
      return false;
    }

    public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
    {
      return true;
    }

  }
}