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//
// System.Web.UI.DataSourceSelectArguments.cs
//
// Author:
// Sanjay Gupta <gsanjay@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;
namespace System.Web.UI
{
public sealed class DataSourceSelectArguments
{
string sortExpression;
int startingRowIndex;
int maxRows;
bool getTotalRowCount;
int totalRowCount = -1;
DataSourceCapabilities dsc = DataSourceCapabilities.None;
// MSDN: Gets a DataSourceSelectArguments object with the sort expression set to Empty.
public static DataSourceSelectArguments Empty {
get {
return new DataSourceSelectArguments ();
}
}
public DataSourceSelectArguments ()
{
}
public DataSourceSelectArguments (string sortExpression)
{
this.sortExpression = sortExpression;
}
public DataSourceSelectArguments (int startRowIndex, int maximumRows)
{
this.startingRowIndex = startRowIndex;
this.maxRows = maximumRows;
}
public DataSourceSelectArguments (string sortExpression, int startRowIndex, int maximumRows)
{
this.sortExpression = sortExpression;
this.startingRowIndex = startRowIndex;
this.maxRows = maximumRows;
}
public void AddSupportedCapabilities (DataSourceCapabilities capabilities)
{
this.dsc = this.dsc | capabilities;
}
// MSDN: The DataSourceSelectArguments class overrides the Object.Equals method to test
// equality using the various properties of the objects. If the MaximumRows,
// RetrieveTotalRowCount, SortExpression, StartRowIndex, and TotalRowCount properties
// are all equal in value, the Equals(Object) method returns true.
public override bool Equals (object obj)
{
DataSourceSelectArguments args = obj as DataSourceSelectArguments;
if (args == null)
return false;
return (this.SortExpression == args.SortExpression &&
this.StartRowIndex == args.StartRowIndex &&
this.MaximumRows == args.MaximumRows &&
this.RetrieveTotalRowCount == args.RetrieveTotalRowCount &&
this.TotalRowCount == args.TotalRowCount);
}
public override int GetHashCode ()
{
int hash = SortExpression != null ? SortExpression.GetHashCode() : 0;
return hash ^ StartRowIndex ^ MaximumRows ^ RetrieveTotalRowCount.GetHashCode() ^ TotalRowCount;
}
// The RaiseUnsupportedCapabilitiesError method is used by data-bound controls
// to compare additional requested capabilities represented by the properties
// of the DataSourceSelectArguments class, such as the ability to sort or page
// through a result set, with the capabilities supported by the data source view.
// The view calls its own RaiseUnsupportedCapabilityError method for each possible
// capability defined in the DataSourceCapabilities enumeration.
public void RaiseUnsupportedCapabilitiesError (DataSourceView view)
{
DataSourceCapabilities requestedCaps = RequestedCapabilities;
DataSourceCapabilities notSupportedCaps = (requestedCaps ^ dsc) & requestedCaps;
if (notSupportedCaps == DataSourceCapabilities.None)
return;
if ((notSupportedCaps & DataSourceCapabilities.RetrieveTotalRowCount) > 0)
notSupportedCaps = DataSourceCapabilities.RetrieveTotalRowCount;
else if ((notSupportedCaps & DataSourceCapabilities.Page) > 0)
notSupportedCaps = DataSourceCapabilities.Page;
view.RaiseUnsupportedCapabilityError (notSupportedCaps);
}
DataSourceCapabilities RequestedCapabilities {
get {
DataSourceCapabilities caps = DataSourceCapabilities.None;
if (!String.IsNullOrEmpty (SortExpression))
caps |= DataSourceCapabilities.Sort;
if (RetrieveTotalRowCount)
caps |= DataSourceCapabilities.RetrieveTotalRowCount;
if (StartRowIndex > 0 || MaximumRows > 0)
caps |= DataSourceCapabilities.Page;
return caps;
}
}
public int MaximumRows {
get { return this.maxRows; }
set { this.maxRows = value; }
}
public bool RetrieveTotalRowCount {
get { return this.getTotalRowCount; }
set { this.getTotalRowCount = value; }
}
public string SortExpression {
get {
if (sortExpression == null)
return String.Empty;
return this.sortExpression;
}
set { this.sortExpression = value; }
}
public int StartRowIndex {
get { return this.startingRowIndex; }
set { this.startingRowIndex = value; }
}
public int TotalRowCount {
get { return this.totalRowCount; }
set { this.totalRowCount = value; }
}
}
}
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