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//
// System.ComponentModel.BaseNumberConverter.cs
//
// Authors:
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (C) 2002/2003 Ximian, Inc (http://www.ximian.com)
// (C) 2003 Andreas Nahr
//
//
// 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;
using System.Globalization;
namespace System.ComponentModel
{
public abstract class BaseNumberConverter : TypeConverter
{
internal Type InnerType;
protected BaseNumberConverter()
{
}
internal abstract bool SupportHex {
get;
}
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 t)
{
if (t == typeof (string))
return true;
return base.CanConvertTo (context, t);
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (culture == null)
culture = CultureInfo.CurrentCulture;
string text = value as string;
if (text != null) {
try {
if (SupportHex) {
if (text.Length >= 1 && text[0] == '#') {
return ConvertFromString (text.Substring (1), 16);
}
if (text.StartsWith ("0x") || text.StartsWith ("0X")) {
return ConvertFromString (text, 16);
}
}
NumberFormatInfo numberFormatInfo = (NumberFormatInfo) culture.GetFormat(typeof(NumberFormatInfo));
return ConvertFromString (text, numberFormatInfo);
} catch (Exception e) {
// LAMESPEC MS wraps the actual exception in an Exception
throw new Exception (value.ToString() + " is not a valid "
+ "value for " + InnerType.Name + ".", e);
}
}
return base.ConvertFrom (context, culture, value);
}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture,
object value, Type destinationType)
{
if (value == null)
throw new ArgumentNullException ("value");
if (culture == null)
culture = CultureInfo.CurrentCulture;
#if NET_2_0
if (destinationType == typeof (string) && value is IConvertible)
return ((IConvertible) value).ToType (destinationType, culture);
#else
if (destinationType == typeof (string) && value.GetType () == InnerType) {
NumberFormatInfo numberFormatInfo = (NumberFormatInfo) culture.GetFormat (typeof (NumberFormatInfo));
return ConvertToString (value, numberFormatInfo);
}
#endif
return base.ConvertTo (context, culture, value, destinationType);
}
internal abstract string ConvertToString (object value, NumberFormatInfo format);
internal abstract object ConvertFromString (string value, NumberFormatInfo format);
internal virtual object ConvertFromString (string value, int fromBase)
{
if (SupportHex) {
throw new NotImplementedException ();
} else {
throw new InvalidOperationException ();
}
}
}
}
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