/// <summary>
/// Raises the <see cref="E:Selecting"/> event.
/// </summary>
/// <param name="args">The <see cref="NBear.Web.Data.NBearDataSourceEventArgs"/> instance containing the event data.</param>
internal void OnSelecting(NBearDataSourceSelectingEventArgs args)
{
if (Selecting != null)
{
Selecting(this, args);
}
}
protected override IEnumerable ExecuteSelect(DataSourceSelectArguments arguments)
{
NBearDataSourceSelectingEventArgs selectingArgs = new NBearDataSourceSelectingEventArgs(arguments);
owner.OnSelecting(selectingArgs);
arguments = selectingArgs.SelectArguments == null ? DataSourceSelectArguments.Empty : selectingArgs.SelectArguments;
arguments.RaiseUnsupportedCapabilitiesError(this);
Gateway gateway = owner.Gateway;
Type type = Util.GetType(this.owner.TypeName);
string sort = owner.DefaultOrderByExpression;
if (!string.IsNullOrEmpty(arguments.SortExpression))
{
string[] parts = arguments.SortExpression.Split(new char[] { ' ' }, 2);
string field = "{" + parts[0] + "}";
sort = field + (parts.Length >= 2 ? " " + parts[1] : " ASC");
}
int page = (arguments.MaximumRows > 0 ? (arguments.StartRowIndex / arguments.MaximumRows) + 1 : 1);
WhereClip where = string.IsNullOrEmpty(owner.FilterExpression) ? WhereClip.All : new WhereClip(owner.FilterExpression);
OrderByClip orderBy = string.IsNullOrEmpty(sort) ? OrderByClip.Default : new OrderByClip(sort);
Array list;
if (arguments.MaximumRows > 0)
{
object pageSelector = typeof(Gateway).GetMethod("GetPageSelector").MakeGenericMethod(type).Invoke(gateway, new object[] { where, orderBy, arguments.MaximumRows });
list = (Array)typeof(PageSelector <>).MakeGenericType(type).GetMethod("FindPage").Invoke(pageSelector, new object[] { page });
}
else
{
list = (Array)GetGatewayMethodInfo("EntityType[] FindArray[EntityType](NBear.Common.WhereClip, NBear.Common.OrderByClip)").MakeGenericMethod(type).Invoke(gateway, new object[] { where, orderBy });
}
if (arguments.RetrieveTotalRowCount)
{
arguments.TotalRowCount = (int)GetGatewayMethodInfo("Int32 Count[EntityType](NBear.Common.WhereClip)").MakeGenericMethod(type).Invoke(gateway, new object[] { where });
}
NBearDataSourceSelectedEventArgs selectedArgs = new NBearDataSourceSelectedEventArgs(arguments, list);
owner.OnSelected(selectedArgs);
return(selectedArgs.ResultEntities);
}