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//
// System.Web.UI.DataSourceView
//
// Authors:
// Ben Maurer (bmaurer@users.sourceforge.net)
// Sanjay Gupta (gsanjay@novell.com)
//
// (C) 2003 Ben Maurer
// (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.Collections.Specialized;
using System.Text;
using System.ComponentModel;
namespace System.Web.UI {
public abstract class DataSourceView
{
//IDataSource dataSourceOwner;
string viewName = String.Empty;
protected DataSourceView (IDataSource owner, string viewName)
{
if (owner == null)
throw new ArgumentNullException ("owner");
//this.dataSourceOwner = owner;
this.viewName = viewName;
owner.DataSourceChanged += new EventHandler (OnDataSourceChanged);
}
void OnDataSourceChanged (object sender, EventArgs e) {
OnDataSourceViewChanged (EventArgs.Empty);
}
public virtual void Delete (IDictionary keys, IDictionary oldValues,
DataSourceViewOperationCallback callback)
{
if (callback == null)
throw new ArgumentNullException ("callBack");
int rowAffected;
try {
rowAffected = ExecuteDelete (keys, oldValues);
}
catch (Exception e) {
if (!callback (0, e))
throw;
return;
}
callback (rowAffected, null);
}
protected virtual int ExecuteDelete(IDictionary keys, IDictionary oldValues)
{
throw new NotSupportedException ();
}
protected virtual int ExecuteInsert (IDictionary values)
{
throw new NotSupportedException();
}
protected internal abstract IEnumerable ExecuteSelect (
DataSourceSelectArguments arguments);
protected virtual int ExecuteUpdate (IDictionary keys, IDictionary values,
IDictionary oldValues )
{
throw new NotSupportedException ();
}
public virtual void Insert (IDictionary values,
DataSourceViewOperationCallback callback)
{
if (callback == null)
throw new ArgumentNullException("callback");
int rowAffected;
try {
rowAffected = ExecuteInsert (values);
} catch (Exception e) {
if (!callback (0, e))
throw;
return;
}
callback (rowAffected, null);
}
protected virtual void OnDataSourceViewChanged (EventArgs e)
{
if (eventsList != null) {
EventHandler evtHandler = eventsList [EventDataSourceViewChanged] as EventHandler;
if (evtHandler != null)
evtHandler(this, e);
}
}
protected internal virtual void RaiseUnsupportedCapabilityError (
DataSourceCapabilities capability)
{
if ((capability & DataSourceCapabilities.Sort) != 0)
if (!CanSort)
throw new NotSupportedException ("Sort Capabilites");
if ((capability & DataSourceCapabilities.Page) != 0)
if (!CanPage)
throw new NotSupportedException("Page Capabilites");
if ((capability & DataSourceCapabilities.RetrieveTotalRowCount) != 0)
if (!CanRetrieveTotalRowCount)
throw new NotSupportedException("RetrieveTotalRowCount Capabilites");
return;
}
public virtual void Select (DataSourceSelectArguments arguments,
DataSourceViewSelectCallback callback)
{
if (callback == null)
throw new ArgumentNullException("callBack");
arguments.RaiseUnsupportedCapabilitiesError (this);
IEnumerable selectList = ExecuteSelect (arguments);
callback (selectList);
}
public virtual void Update(IDictionary keys, IDictionary values,
IDictionary oldValues, DataSourceViewOperationCallback callback)
{
if (callback == null)
throw new ArgumentNullException ("callback");
int rowAffected;
try {
rowAffected = ExecuteUpdate (keys, values, oldValues);
} catch (Exception e) {
if (!callback (0, e))
throw;
return;
}
callback (rowAffected, null);
}
public virtual bool CanDelete { get { return false; } }
public virtual bool CanInsert { get { return false; } }
public virtual bool CanPage { get { return false; } }
public virtual bool CanRetrieveTotalRowCount { get { return false; } }
public virtual bool CanSort { get { return false; } }
public virtual bool CanUpdate { get { return false; } }
EventHandlerList eventsList;
protected EventHandlerList Events {
get {
if (eventsList == null)
eventsList = new EventHandlerList();
return eventsList;
}
}
internal bool HasEvents ()
{
return eventsList != null;
}
public string Name {
get { return viewName; }
}
static readonly object EventDataSourceViewChanged = new object ();
public event EventHandler DataSourceViewChanged
{
add { Events.AddHandler (EventDataSourceViewChanged, value); }
remove { Events.RemoveHandler (EventDataSourceViewChanged, value); }
}
}
}
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