**** Merged from MCS ****
[mono-project.git] / mcs / class / System / System.ComponentModel / TypeConverter.cs
blob1abb70f4182221bb582dd2ddfac7133de4789a94
1 //
2 // System.ComponentModel.TypeConverter.cs
3 //
4 // Authors:
5 // Gonzalo Paniagua Javier (gonzalo@ximian.com)
6 // Andreas Nahr (ClassDevelopment@A-SoftTech.com)
7 //
8 // (C) 2002/2003 Ximian, Inc (http://www.ximian.com)
9 // (C) 2003 Andreas Nahr
13 // Permission is hereby granted, free of charge, to any person obtaining
14 // a copy of this software and associated documentation files (the
15 // "Software"), to deal in the Software without restriction, including
16 // without limitation the rights to use, copy, modify, merge, publish,
17 // distribute, sublicense, and/or sell copies of the Software, and to
18 // permit persons to whom the Software is furnished to do so, subject to
19 // the following conditions:
20 //
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
23 //
24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System;
34 using System.Collections;
35 using System.Globalization;
36 using System.Runtime.InteropServices;
38 namespace System.ComponentModel
40 [ComVisible (true)]
41 public class TypeConverter
43 public bool CanConvertFrom (Type sourceType)
45 return CanConvertFrom (null, sourceType);
48 public virtual bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
50 return false;
53 public bool CanConvertTo (Type destinationType)
55 return CanConvertTo (null, destinationType);
58 public virtual bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
60 return (destinationType == typeof (string));
63 public object ConvertFrom (object o)
65 return ConvertFrom (null, CultureInfo.CurrentCulture, o);
68 public virtual object ConvertFrom (ITypeDescriptorContext context, CultureInfo culture, object value)
70 throw new NotSupportedException (this.ToString() + " cannot be created from '" +
71 value.GetType().ToString() + "'");
74 public object ConvertFromInvariantString (string text)
76 return ConvertFromInvariantString (null, text);
79 public object ConvertFromInvariantString (ITypeDescriptorContext context, string text)
81 return ConvertFromString (context, CultureInfo.InvariantCulture, text);
84 public object ConvertFromString (string text)
86 return ConvertFrom (text);
89 public object ConvertFromString (ITypeDescriptorContext context, string text)
91 return ConvertFromString (context, CultureInfo.CurrentCulture, text);
94 public object ConvertFromString (ITypeDescriptorContext context, CultureInfo culture, string text)
96 return ConvertFrom (context, culture, text);
99 public object ConvertTo (object value, Type destinationType)
101 return ConvertTo (null, null, value, destinationType);
104 public virtual object ConvertTo (ITypeDescriptorContext context, CultureInfo culture, object value,
105 Type destinationType)
107 // context? culture?
108 if (destinationType == null)
109 throw new ArgumentNullException ("destinationType");
111 if (destinationType == typeof (string)) {
112 if (value != null)
113 return value.ToString();
114 return String.Empty;
117 throw new NotSupportedException ("Conversion not supported");
120 public string ConvertToInvariantString (object value)
122 return ConvertToInvariantString (null, value);
125 public string ConvertToInvariantString (ITypeDescriptorContext context, object value)
127 return (string) ConvertTo (context, CultureInfo.InvariantCulture, value, typeof (string));
130 public string ConvertToString (object value)
132 return (string) ConvertTo (null, CultureInfo.CurrentCulture, value, typeof (string));
135 public string ConvertToString (ITypeDescriptorContext context, object value)
137 return (string) ConvertTo (context, CultureInfo.CurrentCulture, value, typeof (string));
140 public string ConvertToString (ITypeDescriptorContext context, CultureInfo culture, object value)
142 return (string) ConvertTo (context, culture, value, typeof (string));
145 protected Exception GetConvertFromException (object value)
147 throw new NotSupportedException (this.ToString() + " cannot convert from '" +
148 value.GetType().ToString() + "'");
151 protected Exception GetConvertToException (object value, Type destinationType)
153 throw new NotSupportedException (this.ToString() + " cannot convert from '" +
154 value.GetType().ToString() + "' to '" + destinationType.ToString() + "'");
157 public object CreateInstance (IDictionary propertyValues)
159 return CreateInstance (null, propertyValues);
162 public virtual object CreateInstance (ITypeDescriptorContext context, IDictionary propertyValues)
164 return null;
167 public bool GetCreateInstanceSupported ()
169 return GetCreateInstanceSupported (null);
172 public virtual bool GetCreateInstanceSupported (ITypeDescriptorContext context)
174 return false;
177 public PropertyDescriptorCollection GetProperties (object value)
179 return GetProperties (null, value);
182 public PropertyDescriptorCollection GetProperties (ITypeDescriptorContext context, object value)
184 return GetProperties (context, value, null);
187 public virtual PropertyDescriptorCollection GetProperties (ITypeDescriptorContext context,
188 object value, Attribute[] attributes)
190 return null;
193 public bool GetPropertiesSupported ()
195 return GetPropertiesSupported (null);
198 public virtual bool GetPropertiesSupported (ITypeDescriptorContext context)
200 return false;
203 public ICollection GetStandardValues ()
205 return GetStandardValues (null);
208 public virtual StandardValuesCollection GetStandardValues (ITypeDescriptorContext context)
210 return null;
213 public bool GetStandardValuesExclusive ()
215 return GetStandardValuesExclusive (null);
218 public virtual bool GetStandardValuesExclusive (ITypeDescriptorContext context)
220 return false;
223 public bool GetStandardValuesSupported ()
225 return GetStandardValuesSupported (null);
228 public virtual bool GetStandardValuesSupported (ITypeDescriptorContext context)
230 return false;
233 public bool IsValid (object value)
235 return IsValid (null, value);
238 public virtual bool IsValid (ITypeDescriptorContext context, object value)
240 return true;
243 protected PropertyDescriptorCollection SortProperties (PropertyDescriptorCollection props, string[] names)
245 props.Sort (names);
246 return props;
249 public class StandardValuesCollection : ICollection, IEnumerable
251 private ICollection values;
253 public StandardValuesCollection (ICollection values)
255 this.values = values;
258 public void CopyTo (Array array, int index)
260 values.CopyTo (array, index);
263 public IEnumerator GetEnumerator ()
265 return values.GetEnumerator ();
268 bool ICollection.IsSynchronized {
269 get { return false; }
272 object ICollection.SyncRoot {
273 get { return null; }
276 int ICollection.Count {
277 get { return this.Count; }
280 public int Count {
281 get { return values.Count; }
284 public object this [int index] {
285 get { return ((IList) values) [index]; }
289 protected abstract class SimplePropertyDescriptor : PropertyDescriptor
291 private Type componentType;
292 private Type propertyType;
294 public SimplePropertyDescriptor (Type componentType,
295 string name,
296 Type propertyType) :
297 this (componentType, name, propertyType, null)
301 public SimplePropertyDescriptor (Type componentType,
302 string name,
303 Type propertyType,
304 Attribute [] attributes) : base (name, attributes)
306 this.componentType = componentType;
307 this.propertyType = propertyType;
310 public override Type ComponentType {
311 get { return componentType; }
314 public override Type PropertyType {
315 get { return propertyType; }
318 public override bool IsReadOnly {
319 get { return Attributes.Contains (ReadOnlyAttribute.Yes); }
322 public override bool ShouldSerializeValue (object component)
324 return false;
327 public override bool CanResetValue (object component)
329 DefaultValueAttribute Attrib = ((DefaultValueAttribute) Attributes[typeof (DefaultValueAttribute)]);
330 if (Attrib == null) {
331 return false;
333 return (Attrib.Value == GetValue (component));
336 public override void ResetValue (object component)
338 DefaultValueAttribute Attrib = ((DefaultValueAttribute) Attributes[typeof (DefaultValueAttribute)]);
339 if (Attrib != null) {
340 SetValue (component, Attrib.Value);