/// <summary>
/// If there is anything in the redo stack the top is popped and executed
/// </summary>
internal static void Redo()
{
if (redoStack.Count > 0)
{
Core.ICommand commandrecord = redoStack.Pop();
Execute(commandrecord);
redoStackNames.RemoveAt(0);
}
}
/// <summary>
/// All-in-one method to add a command to the stack.
/// The method will be executed after it's been added to the stack.
/// </summary>
/// <param name="cmd">The command record.</param>
internal static void Execute(Core.ICommand cmd)
{
cmd.Redo();
if (cmd is Core.ICommand)
{
undoStack.Push(cmd);
undoStackNames.Insert(0, cmd.Text);
}
}
/// <summary>
/// If there is anything in the undo stack the top is popped and undone.
/// </summary>
internal static void Undo()
{
if (undoStack.Count > 0)
{
Core.ICommand cmd = undoStack.Pop();
cmd.Undo();
undoStackNames.RemoveAt(0);
redoStack.Push(cmd);
redoStackNames.Insert(0, cmd.Text);
}
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="command">The command this instance is associated with.</param>
internal SurrogateDirect(Core.ICommand command)
{
if ((_Command = command) == null) throw new ArgumentNullException(
"command", "Command cannot be null.");
if (_Command.Link == null) throw new InvalidOperationException(
"Link of command '{0}' is null."
.FormatWith(_Command));
if (!(_Command.Link is Direct.IDataLink)) throw new InvalidOperationException(
"Link '{0}' of command '{1}' is not a direct link."
.FormatWith(_Command.Link, _Command));
}
/// <summary>
/// Invoked when disposing or finalizing this instance.
/// </summary>
/// <param name="disposing">True if the object is being disposed, false otherwise.</param>
protected virtual void OnDispose(bool disposing)
{
if (disposing)
{
if (_DbCommand != null)
{
try { _DbCommand.Cancel(); if (disposing)
{
_DbCommand.Dispose();
}
}
catch { }
}
if (_DataReader != null)
{
try { if (!_DataReader.IsClosed)
{
_DataReader.Close();
}
if (disposing)
{
_DataReader.Dispose();
}
}
catch { }
}
if (Link != null)
{
try { if (Link.IsOpen && _LinkOpenedBySurrogate)
{
Link.Close();
}
}
catch { }
}
}
_DbCommand = null;
_DataReader = null;
_LinkOpenedBySurrogate = false;
_Command = null;
_Schema = null;
_IsDisposed = true;
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="command">The command this instance is associated with.</param>
internal SurrogateDirect(Core.ICommand command)
{
if ((_Command = command) == null)
{
throw new ArgumentNullException(
"command", "Command cannot be null.");
}
if (_Command.Link == null)
{
throw new InvalidOperationException(
"Link of command '{0}' is null."
.FormatWith(_Command));
}
if (!(_Command.Link is Direct.IDataLink))
{
throw new InvalidOperationException(
"Link '{0}' of command '{1}' is not a direct link."
.FormatWith(_Command.Link, _Command));
}
}
/// <summary>
/// Invoked when disposing or finalizing this instance.
/// </summary>
/// <param name="disposing">True if the object is being disposed, false otherwise.</param>
protected virtual void OnDispose(bool disposing)
{
if (disposing)
{
if (_DbCommand != null)
{
try { _DbCommand.Cancel(); if (disposing) _DbCommand.Dispose(); }
catch { }
}
if (_DataReader != null)
{
try { if (!_DataReader.IsClosed) _DataReader.Close(); if (disposing) _DataReader.Dispose(); }
catch { }
}
if (Link != null)
{
try { if (Link.IsOpen && _LinkOpenedBySurrogate) Link.Close(); }
catch { }
}
}
_DbCommand = null;
_DataReader = null;
_LinkOpenedBySurrogate = false;
_Command = null;
_Schema = null;
_IsDisposed = true;
}
protected CommandHandler(Core.ICommand command)
{
this.Command = (TCommand)command;
}
