//
// System.ComponentModel.EnumConverter.cs
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Ivan N. Zlatev (contact@i-nz.net)
//
// (C) 2002 Ximian, Inc (http://www.ximian.com)
// (C) 2003 Andreas Nahr
// (C) 2007 Ivan N. Zlatev
//
//
// 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.Collections;
using System.Globalization;
using System.Reflection;
using System.ComponentModel.Design.Serialization;
namespace System.ComponentModel{
public class EnumConverter : TypeConverter
{
private Type type;
private StandardValuesCollection stdValues;
public EnumConverter (Type type)
{
this.type = type;
}
public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof (InstanceDescriptor))
return true;
#if NET_2_0
if (destinationType == typeof (Enum[]))
return true;
#endif
return base.CanConvertTo (context, destinationType);
}
public override object ConvertTo (ITypeDescriptorContext context,
CultureInfo culture,
object value,
Type destinationType)
{
if (destinationType == typeof (string) && value != null) {
// we need to be able to convert enum names,
// integral values and other enum fields
if (value is IConvertible) {
Type underlyingType = Enum.GetUnderlyingType (type);
if (underlyingType != value.GetType ()) {
value = ((IConvertible) value).ToType (
underlyingType, culture);
}
}
if (!IsFlags && !IsValid (context, value))
throw CreateValueNotValidException (value);
return Enum.Format (type, value, "G");
} else if (destinationType == typeof (InstanceDescriptor) && value != null) {
string enumString = ConvertToString (context, culture, value);
if (IsFlags && enumString.IndexOf (",") != -1) {
if (value is IConvertible) {
Type underlyingType = Enum.GetUnderlyingType (type);
object enumValue = ((IConvertible)value).ToType (underlyingType, culture);
MethodInfo toObjectMethod = typeof (Enum).GetMethod ("ToObject", new Type[] { typeof (Type),
underlyingType });
return new InstanceDescriptor (toObjectMethod, new object[] { type, enumValue });
}
} else {
FieldInfo f = type.GetField (enumString);
if (f != null)
return new InstanceDescriptor (f, null);
}
#if NET_2_0
} else if (destinationType == typeof (Enum[]) && value != null) {
if (!IsFlags) {
return new Enum[] { (Enum) Enum.ToObject (type, value) };
} else {
long valueLong = Convert.ToInt64 (
(Enum) value, culture);
Array enumValArray = Enum.GetValues (type);
long[] enumValues = new long[enumValArray.Length];
for (int i=0; i < enumValArray.Length; i++)
enumValues[i] = Convert.ToInt64 (enumValArray.GetValue (i));
ArrayList enums = new ArrayList ();
bool interrupt = false;
while (!interrupt) {
// interrupt the loop unless we find a match to avoid
// looping indefinitely
interrupt = true;
foreach (long val in enumValues) {
if ((val != 0 && ((val & valueLong) == val)) || val == valueLong) {
enums.Add (Enum.ToObject (type, val));
valueLong &= (~val);
interrupt = false;
}
}
if (valueLong == 0) // nothing left to do
interrupt = true;
}
// add item for remainder
if (valueLong != 0)
enums.Add (Enum.ToObject (type, valueLong));
return enums.ToArray (typeof(Enum));
}
#endif
}
return base.ConvertTo (context, culture, value, destinationType);
}
public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof (string))
return true;
#if NET_2_0
if (sourceType == typeof (Enum[]))
return true;
#endif
return base.CanConvertFrom (context, sourceType);
}
public override object ConvertFrom (ITypeDescriptorContext context,
CultureInfo culture,
object value)
{
if (value is string) {
string name = value as string;
#if NET_2_0
try {
#endif
if (name.IndexOf (',') == -1)
return Enum.Parse (type, name, true);
long val = 0;
string [] names = name.Split (',');
foreach (string n in names) {
Enum e = (Enum) Enum.Parse (type, n, true);
val |= Convert.ToInt64 (e, culture);
}
return Enum.ToObject (type, val);
#if NET_2_0
} catch (Exception ex) {
throw new FormatException (name + " is " +
"not a valid value for " +
type.Name, ex);
}
#endif
#if NET_2_0
} else if (value is Enum[]) {
long val = 0;
foreach (Enum e in (Enum[])value)
val |= Convert.ToInt64 (e, culture);
return Enum.ToObject (type, val);
#endif
}
return base.ConvertFrom (context, culture, value);
}
public override bool IsValid (ITypeDescriptorContext context, object value)
{
return Enum.IsDefined (type, value);
}
public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
{
return true;
}
public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
{
return !IsFlags;
}
public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
{
if (stdValues == null) {
Array values = Enum.GetValues (type);
Array.Sort (values);
stdValues = new StandardValuesCollection (values);
}
return stdValues;
}
protected virtual IComparer Comparer {
get { return new EnumConverter.EnumComparer (); }
}
protected Type EnumType {
get { return type; }
}
protected TypeConverter.StandardValuesCollection Values {
get { return stdValues; }
set { stdValues = value; }
}
ArgumentException CreateValueNotValidException (object value)
{
string msg = string.Format (CultureInfo.InvariantCulture,
"The value '{0}' is not a valid value for the " +
"enum '{1}'", value, type.Name);
return new ArgumentException (msg);
}
bool IsFlags {
get {
return (type.IsDefined (typeof (FlagsAttribute),
false));
}
}
private class EnumComparer : IComparer
{
int IComparer.Compare (object compareObject1, object compareObject2)
{
string CompareString1 = (compareObject1 as string);
string CompareString2 = (compareObject2 as string);
if ((CompareString1 == null) || (CompareString2 == null))
return Collections.Comparer.Default.Compare (compareObject1, compareObject2);
return CultureInfo.InvariantCulture.CompareInfo.Compare (CompareString1, CompareString2);
}
}
}
}
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