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//
// System.ComponentModel.TypeDescriptionProvider
//
// Authors:
// Ivan N. Zlatev (contact i-nZ.net)
//
// (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;
namespace System.ComponentModel
{
public abstract class TypeDescriptionProvider
{
private sealed class EmptyCustomTypeDescriptor : CustomTypeDescriptor
{
}
private EmptyCustomTypeDescriptor _emptyCustomTypeDescriptor;
private TypeDescriptionProvider _parent;
protected TypeDescriptionProvider ()
{
}
protected TypeDescriptionProvider (TypeDescriptionProvider parent)
{
_parent = parent;
}
public virtual object CreateInstance (IServiceProvider provider, Type objectType, Type[] argTypes, object[] args)
{
if (_parent != null)
return _parent.CreateInstance (provider, objectType, argTypes, args);
return System.Activator.CreateInstance (objectType, args);
}
public virtual IDictionary GetCache (object instance)
{
if (_parent != null)
return _parent.GetCache (instance);
return null;
}
public virtual ICustomTypeDescriptor GetExtendedTypeDescriptor (object instance)
{
if (_parent != null)
return _parent.GetExtendedTypeDescriptor (instance);
if (_emptyCustomTypeDescriptor == null)
_emptyCustomTypeDescriptor = new EmptyCustomTypeDescriptor ();
return _emptyCustomTypeDescriptor;
}
public virtual string GetFullComponentName (object component)
{
if (_parent != null)
return _parent.GetFullComponentName (component);
return GetTypeDescriptor (component).GetComponentName ();
}
public Type GetReflectionType (object instance)
{
if (instance == null)
throw new ArgumentNullException ("instance");
return GetReflectionType (instance.GetType (), instance);
}
public Type GetReflectionType (Type objectType)
{
return GetReflectionType (objectType, null);
}
public virtual Type GetReflectionType (Type objectType, object instance)
{
if (_parent != null)
return _parent.GetReflectionType (objectType, instance);
return objectType;
}
public ICustomTypeDescriptor GetTypeDescriptor (object instance)
{
if (instance == null)
throw new ArgumentNullException ("instance");
return GetTypeDescriptor (instance.GetType (), instance);
}
public ICustomTypeDescriptor GetTypeDescriptor (Type objectType)
{
return GetTypeDescriptor (objectType, null);
}
public virtual ICustomTypeDescriptor GetTypeDescriptor (Type objectType, object instance)
{
if (_parent != null)
return _parent.GetTypeDescriptor (objectType, instance);
if (_emptyCustomTypeDescriptor == null)
_emptyCustomTypeDescriptor = new EmptyCustomTypeDescriptor ();
return _emptyCustomTypeDescriptor;
}
#if NET_4_0
public virtual bool IsSupportedType (Type type)
{
if (type == null)
throw new ArgumentNullException ("type");
if (_parent != null)
return _parent.IsSupportedType (type);
return true;
}
public virtual Type GetRuntimeType (Type reflectionType)
{
if (reflectionType == null)
throw new ArgumentNullException ("reflectionType");
if (_parent != null)
return _parent.GetRuntimeType (reflectionType);
return reflectionType;
}
protected internal virtual IExtenderProvider[] GetExtenderProviders (object instance)
{
if (instance == null)
throw new ArgumentNullException ("instance");
if (_parent != null)
return _parent.GetExtenderProviders (instance);
return new IExtenderProvider [] { };
}
#endif
}
}
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