Alternative solution to polymorphism and heterogeneous hierarchies

Dear Matlab Support,

I would like to implement something simular to the following picutre:

With the following requirements:

• The lowest level (cATSConst, cATSMap) should be hold in one list
• The common attributes of cASAP2Base are filled by the constuctor of cATSBase (could be abstract and does not have any attributes)

Is there a possability to create a list in Matlab 2018 and derive from two classes?

I hope the short description is suffitioned otherwise please let me know.

Best regards

Martin

Answer 1

[Leepakshi]

Hello Martin,

To implement the class hierarchy shown in the diagram using MATLAB, you'll need to define several classes using the below concepts:

1. matlab.mixin.Heterogeneous: This is a built-in class that allows heterogeneous arrays. Refer this documentation https://in.mathworks.com/help/matlab/ref/matlab.mixin.heterogeneous-class.html

2. cSLBlockBase: Inherits from matlab.mixin.Heterogeneous.

3. cASAP2Base: Inherits from cSLBlockBase.

4. cATSBase: Inherits from cASAP2Base.

5. cASAP2Const and cASAP2Map: Inherit from cASAP2Base.

6. cATSConst and cATSMap1: Inherit from cATSBase.

This will create a heterogeneous array of objects, allowing you to hold different types of objects in a single list.

- You may need to add additional methods and properties as required by your application.

- The cATSBase class constructor is used to fill common attributes, as per your requirement.

- You can create a list of objects from cATSConst and `cATSMap1` using an array of cATSBase type.

Here's a basic implementation in MATLAB:

NOTE: Please create a new class in a new file as only one class definition is allowed in one file.

% cSLBlockBase.m 
classdef cSLBlockBase < matlab.mixin.Heterogeneous 
    properties 
        Name 
        Path 
    end 
end 

% cASAP2Base.m 
classdef cASAP2Base < cSLBlockBase 
    properties 
        MaskName 
        MaskValue 
    end 
    methods 
        function obj = cASAP2Base(name, path, maskName, maskValue) 
            obj.Name = name; 
            obj.Path = path; 
            obj.MaskName = maskName; 
            obj.MaskValue = maskValue; 
        end 
        function str = StringTrim(obj) 
            str = strtrim(obj.MaskName); 
        end 
    end 
end 

% cATSBase.m 
classdef cATSBase < cASAP2Base 
    methods 
        function obj = cATSBase(name, path, maskName, maskValue) 
            obj = obj@cASAP2Base(name, path, maskName, maskValue); 
            % Read base ATS info 
        end 
    end 
end 

% cASAP2Const.m 
classdef cASAP2Const < cASAP2Base 
end  

% cASAP2Map.m 
classdef cASAP2Map < cASAP2Base 
    properties 
        Axis 
    end 
end 

% cATSConst.m 
classdef cATSConst < cATSBase 
    properties 
        SLOBJ 
        GDEVersion 
        RangeMax 
    end 
end 

% cATSMap1.m 
classdef cATSMap1 < cATSBase 
    properties 
        SLOBJ 
        GDEVersion 
        RangeMax 
    end 
end 

Example of Creating a List

list = [cATSConst(), cATSMap1()]; 

Hope this helped.