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//
// System.Web.UI.ListSourceHelper
//
// Authors:
// Ben Maurer (bmaurer@users.sourceforge.net)
//
// (C) 2003 Ben Maurer
//
//
// 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.Collections;
using System.Collections.Specialized;
using System.Text;
using System.ComponentModel;
using System.Collections.Generic;
namespace System.Web.UI {
public static class ListSourceHelper {
public static bool ContainsListCollection (IDataSource dataSource)
{
return dataSource.GetViewNames ().Count > 0;
}
public static IList GetList (IDataSource dataSource)
{
if (dataSource.GetViewNames ().Count == 0)
return null;
ListSourceList list = new ListSourceList ();
list.Add (dataSource);
return list;
}
sealed class ListSourceList : List<IDataSource>, ITypedList
{
#region ITypedList Members
PropertyDescriptorCollection ITypedList.GetItemProperties (PropertyDescriptor [] listAccessors) {
ICollection viewNames = this [0].GetViewNames ();
PropertyDescriptor [] a = new PropertyDescriptor [viewNames.Count];
int i = 0;
foreach (string viewName in viewNames) {
a[i++] = new ListSourcePropertyDescriptor (viewName, null);
}
return new PropertyDescriptorCollection (a);
}
string ITypedList.GetListName (PropertyDescriptor [] listAccessors) {
return String.Empty;
}
#endregion
}
sealed class ListSourcePropertyDescriptor : PropertyDescriptor
{
public ListSourcePropertyDescriptor (MemberDescriptor descr)
: base (descr) {
}
public ListSourcePropertyDescriptor (string name, Attribute [] attrs)
: base (name, attrs) {
}
public ListSourcePropertyDescriptor (MemberDescriptor descr, Attribute [] attrs)
: base (descr, attrs) {
}
public override bool CanResetValue (object component) {
throw new NotImplementedException ();
}
public override Type ComponentType {
get { throw new NotImplementedException (); }
}
public override object GetValue (object component) {
IDataSource dataSource = component as IDataSource;
if (dataSource == null)
return null;
DataSourceView view = dataSource.GetView (Name);
return view.ExecuteSelect (DataSourceSelectArguments.Empty);
}
public override bool IsReadOnly {
get { return true; }
}
public override Type PropertyType {
get { return typeof(IEnumerable); }
}
public override void ResetValue (object component) {
throw new NotImplementedException ();
}
public override void SetValue (object component, object value) {
throw new NotImplementedException ();
}
public override bool ShouldSerializeValue (object component) {
throw new NotImplementedException ();
}
}
}
}
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