classdef MySignalMatFile < Simulink.io.FileType

methods 
        
        function outOnFile = whosImpl(obj)
            onFile = whos(obj.FileName);
            
            numVars = length(onFile);
            
            outOnFile(1).name = [];
            outOnFile(1).type = [];
            
            for k = 1: length(numVars)
                
                outOnFile(k).name = onFile(k).name;
                
                if strcmpi( onFile(k).class, 'Simulink.SimulationData.Dataset' )
                    outOnFile(k).type = 'Dataset';
                else
                    % Assume Signal(timeseries or timetable)
                    % other acceptable types
                    %  - Bus   : for bus signals
                    %  - Ground: for grounds (empty double)
                    %  - FunctionCall: for single column double data arrays
                    outOnFile(k).type = 'Signal';
                end
                
            end
            
        end
    end