246 lines
7.4 KiB
C#
246 lines
7.4 KiB
C#
//
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// System.ComponentModel.EnumConverter.cs
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//
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// Authors:
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// Gonzalo Paniagua Javier (gonzalo@ximian.com)
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// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
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// Ivan N. Zlatev (contact@i-nz.net)
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//
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// (C) 2002 Ximian, Inc (http://www.ximian.com)
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// (C) 2003 Andreas Nahr
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// (C) 2007 Ivan N. Zlatev
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Globalization;
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using System.Reflection;
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using System.ComponentModel.Design.Serialization;
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namespace System.ComponentModel
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{
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public class EnumConverter : TypeConverter
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{
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private Type type;
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private StandardValuesCollection stdValues;
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public EnumConverter (Type type)
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{
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this.type = type;
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}
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public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
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{
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if (destinationType == typeof (InstanceDescriptor))
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return true;
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if (destinationType == typeof (Enum[]))
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return true;
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return base.CanConvertTo (context, destinationType);
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}
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public override object ConvertTo (ITypeDescriptorContext context,
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CultureInfo culture,
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object value,
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Type destinationType)
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{
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if (destinationType == typeof (string) && value != null) {
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// we need to be able to convert enum names,
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// integral values and other enum fields
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if (value is IConvertible) {
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Type underlyingType = Enum.GetUnderlyingType (type);
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if (underlyingType != value.GetType ()) {
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value = ((IConvertible) value).ToType (
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underlyingType, culture);
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}
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}
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if (!IsFlags && !IsValid (context, value))
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throw CreateValueNotValidException (value);
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return Enum.Format (type, value, "G");
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} else if (destinationType == typeof (InstanceDescriptor) && value != null) {
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string enumString = ConvertToString (context, culture, value);
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if (IsFlags && enumString.IndexOf (",") != -1) {
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if (value is IConvertible) {
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Type underlyingType = Enum.GetUnderlyingType (type);
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object enumValue = ((IConvertible)value).ToType (underlyingType, culture);
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MethodInfo toObjectMethod = typeof (Enum).GetMethod ("ToObject", new Type[] { typeof (Type),
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underlyingType });
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return new InstanceDescriptor (toObjectMethod, new object[] { type, enumValue });
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}
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} else {
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FieldInfo f = type.GetField (enumString);
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if (f != null)
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return new InstanceDescriptor (f, null);
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}
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} else if (destinationType == typeof (Enum[]) && value != null) {
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if (!IsFlags) {
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return new Enum[] { (Enum) Enum.ToObject (type, value) };
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} else {
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long valueLong = Convert.ToInt64 (
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(Enum) value, culture);
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Array enumValArray = Enum.GetValues (type);
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long[] enumValues = new long[enumValArray.Length];
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for (int i=0; i < enumValArray.Length; i++)
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enumValues[i] = Convert.ToInt64 (enumValArray.GetValue (i));
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ArrayList enums = new ArrayList ();
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bool interrupt = false;
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while (!interrupt) {
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// interrupt the loop unless we find a match to avoid
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// looping indefinitely
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interrupt = true;
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foreach (long val in enumValues) {
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if ((val != 0 && ((val & valueLong) == val)) || val == valueLong) {
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enums.Add (Enum.ToObject (type, val));
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valueLong &= (~val);
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interrupt = false;
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}
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}
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if (valueLong == 0) // nothing left to do
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interrupt = true;
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}
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// add item for remainder
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if (valueLong != 0)
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enums.Add (Enum.ToObject (type, valueLong));
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return enums.ToArray (typeof(Enum));
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}
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}
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return base.ConvertTo (context, culture, value, destinationType);
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}
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public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
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{
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if (sourceType == typeof (string))
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return true;
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if (sourceType == typeof (Enum[]))
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return true;
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return base.CanConvertFrom (context, sourceType);
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}
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public override object ConvertFrom (ITypeDescriptorContext context,
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CultureInfo culture,
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object value)
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{
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if (value is string) {
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string name = value as string;
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try {
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if (name.IndexOf (',') == -1)
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return Enum.Parse (type, name, true);
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long val = 0;
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string [] names = name.Split (',');
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foreach (string n in names) {
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Enum e = (Enum) Enum.Parse (type, n, true);
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val |= Convert.ToInt64 (e, culture);
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}
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return Enum.ToObject (type, val);
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} catch (Exception ex) {
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throw new FormatException (name + " is " +
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"not a valid value for " +
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type.Name, ex);
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}
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} else if (value is Enum[]) {
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long val = 0;
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foreach (Enum e in (Enum[])value)
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val |= Convert.ToInt64 (e, culture);
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return Enum.ToObject (type, val);
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}
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return base.ConvertFrom (context, culture, value);
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}
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public override bool IsValid (ITypeDescriptorContext context, object value)
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{
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return Enum.IsDefined (type, value);
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}
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public override bool GetStandardValuesSupported (ITypeDescriptorContext context)
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{
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return true;
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}
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public override bool GetStandardValuesExclusive (ITypeDescriptorContext context)
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{
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return !IsFlags;
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}
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public override StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
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{
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if (stdValues == null) {
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Array values = Enum.GetValues (type);
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Array.Sort (values);
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stdValues = new StandardValuesCollection (values);
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}
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return stdValues;
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}
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protected virtual IComparer Comparer {
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get { return new EnumConverter.EnumComparer (); }
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}
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protected Type EnumType {
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get { return type; }
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}
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protected TypeConverter.StandardValuesCollection Values {
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get { return stdValues; }
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set { stdValues = value; }
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}
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ArgumentException CreateValueNotValidException (object value)
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{
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string msg = string.Format (CultureInfo.InvariantCulture,
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"The value '{0}' is not a valid value for the " +
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"enum '{1}'", value, type.Name);
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return new ArgumentException (msg);
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}
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bool IsFlags {
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get {
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return (type.IsDefined (typeof (FlagsAttribute),
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false));
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}
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}
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private class EnumComparer : IComparer
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{
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int IComparer.Compare (object compareObject1, object compareObject2)
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{
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string CompareString1 = (compareObject1 as string);
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string CompareString2 = (compareObject2 as string);
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if ((CompareString1 == null) || (CompareString2 == null))
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return Collections.Comparer.Default.Compare (compareObject1, compareObject2);
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return CultureInfo.InvariantCulture.CompareInfo.Compare (CompareString1, CompareString2);
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}
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}
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}
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}
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