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//
// System.Web.UI.WebControls.HierarchicalDataBoundControl.cs
//
// Authors:
// Lluis Sanchez Gual (lluis@novell.com)
//
// (C) 2004-2010 Novell, Inc (http://www.novell.com)
//
//
// 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.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls.Adapters;
namespace System.Web.UI.WebControls
{
[DesignerAttribute ("System.Web.UI.Design.WebControls.HierarchicalDataBoundControlDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
public abstract class HierarchicalDataBoundControl : BaseDataBoundControl
{
[IDReferencePropertyAttribute (typeof(HierarchicalDataSourceControl))]
public override string DataSourceID {
get {
object o = ViewState ["DataSourceID"];
if (o != null)
return (string)o;
return String.Empty;
}
set {
if (Initialized)
RequiresDataBinding = true;
ViewState ["DataSourceID"] = value;
}
}
protected virtual HierarchicalDataSourceView GetData (string viewPath)
{
if (DataSource != null && !String.IsNullOrEmpty (DataSourceID))
throw new HttpException ();
IHierarchicalDataSource ds = GetDataSource ();
if (ds != null)
return ds.GetHierarchicalView (viewPath);
if (DataSource is IHierarchicalEnumerable)
return new ReadOnlyDataSourceView ((IHierarchicalEnumerable) DataSource);
return null;
}
protected virtual IHierarchicalDataSource GetDataSource ()
{
if (IsBoundUsingDataSourceID) {
Control ctrl = FindDataSource ();
if (ctrl == null)
throw new HttpException (string.Format ("A control with ID '{0}' could not be found.", DataSourceID));
if (!(ctrl is IHierarchicalDataSource))
throw new HttpException (string.Format ("The control with ID '{0}' is not a control of type IHierarchicalDataSource.", DataSourceID));
return (IHierarchicalDataSource) ctrl;
}
return DataSource as IHierarchicalDataSource;
}
bool IsDataBound {
get { return ViewState.GetBool ("DataBound", false); }
set { ViewState ["DataBound"] = value; }
}
protected void MarkAsDataBound ()
{
IsDataBound = true;
}
protected override void OnDataPropertyChanged ()
{
RequiresDataBinding = true;
}
protected virtual void OnDataSourceChanged (object sender, EventArgs e)
{
RequiresDataBinding = true;
}
protected internal override void OnLoad (EventArgs e)
{
if (!Initialized) {
Initialize ();
ConfirmInitState ();
}
base.OnLoad(e);
}
void Initialize ()
{
if (!Page.IsPostBack || (IsViewStateEnabled && !IsDataBound))
RequiresDataBinding = true;
IHierarchicalDataSource ds = GetDataSource ();
if (ds != null && DataSourceID != "")
ds.DataSourceChanged += new EventHandler (OnDataSourceChanged);
}
protected override void OnPagePreLoad (object sender, EventArgs e)
{
base.OnPagePreLoad (sender, e);
Initialize ();
}
protected void InternalPerformDataBinding ()
{
HierarchicalDataBoundControlAdapter adapter
= Adapter as HierarchicalDataBoundControlAdapter;
if (adapter != null)
adapter.PerformDataBinding ();
else
PerformDataBinding ();
}
protected internal virtual void PerformDataBinding ()
{
}
protected override void PerformSelect ()
{
OnDataBinding (EventArgs.Empty);
InternalPerformDataBinding ();
// The PerformDataBinding method has completed.
RequiresDataBinding = false;
MarkAsDataBound ();
OnDataBound (EventArgs.Empty);
}
protected override void ValidateDataSource (object dataSource)
{
if (dataSource == null || dataSource is IHierarchicalDataSource || dataSource is IHierarchicalEnumerable)
return;
throw new InvalidOperationException ("Invalid data source");
}
}
}
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