/// <summary>
/// Performs any processing of the command data.
/// </summary>
/// <param name="data">The data to be processed.</param>
/// <remarks>The supplied data is expected to be relevant to this
/// processor (the caller should have already applied any filter
/// to the command stream).</remarks>
void ICmdProcessor.Process(CmdData data)
{
// The command names handled here need to be included
// via the CmdFilter property
if (data.CmdName == AddCmdLine.CmdName)
{
string name = data.GetValue <string>(nameof(AddCmdLine.Name));
Names.Add(name);
}
else if (data.CmdName == CutCmdLine.CmdName)
{
string name = data.GetValue <string>(nameof(CutCmdLine.Name));
int nRem = Names.RemoveAll(x => x == name);
// This is going to fail if this is getting called when we're rebuilding the model.
// Cuts should be handled by marking the adds (to ignore them).
// AltNames only works with the one branch
data.Add(nameof(NameProcessor.CutCount), nRem);
}
else
{
throw new ProcessorException(this, "Unexpected command: " + data.CmdName);
}
}
/// <summary>
/// Reverts any changes that were made via the last call to <see cref="Process"/>
/// </summary>
/// <param name="data">The data that was previously supplied to the
/// <see cref="Process"/> method.</param>
void ICmdProcessor.Undo(CmdData data)
{
if (data.CmdName == AddCmdLine.CmdName)
{
string name = data.GetValue <string>(nameof(AddCmdLine.Name));
// I would expect it to be the last item in our list
int lastIndex = Names.Count - 1;
if (lastIndex < 0 || Names[lastIndex] != name)
{
throw new ApplicationException("Not the last name added: " + name);
}
Names.RemoveAt(lastIndex);
}
else if (data.CmdName == CutCmdLine.CmdName)
{
string name = data.GetValue <string>(nameof(AddCmdLine.Name));
int nCut = data.GetValue <int>(nameof(NameProcessor.CutCount));
for (int i = 0; i < nCut; i++)
{
Names.Add(name);
}
}
else
{
throw new ProcessorException(this, "Unexpected command: " + data.CmdName);
}
}
internal static string GetCommandLine(CmdData data)
{
Debug.Assert(data.CmdName == nameof(NameCmdLine));
string name = data.GetValue <string>(nameof(Name));
return($"name {name}");
}