How do I validate an input method input by a object property?

7 次查看（过去 30 天）
AAA
AAA 2023-9-1
回答： Matt J 2023-9-1
I am having a class "MY_CLASS" and want to write a method. In this method I first want to validate my inputs. The input is an array which should have the same size as given by one of my object properties. How can I implement this by using the arguments block?
classdef MY_CLASS
properties(Access=public)
Filenames cell {mustBeA(Filenames,"cell")} = {['Testrun_xxxx']}
Num_Files (1,1) uint32 {mustBeA(Num_Files,"uint32"), mustBePositive} = uint32(1)
end
methods
% Constructor
function obj = MY_CLASS( filenames, num_Files )
obj.Filenames = filenames;
obj.Num_Files = num_Files;
end
% function where I want to do my arguments validation
function obj = doSomething( obj, var1 )
arguments
obj
var1 (:,1) double {mustBeNumeric, mustBeSpecifiedSize( obj.Num_Files, var1 )}
end
.
.
.
end
end
end
% Validation Function
function mustBeSpecifiedSize( num_elements, array )
if not(num_elements == numel(array))
eidType = 'mustBeSpecifiedSize:invalidNumberOfElements';
msgType = 'Inconsistency issues at the number of elements.';
throwAsCaller(MException(eidType,msgType))
end
end
  2 个评论
AAA
AAA 2023-9-1
编辑：AAA 2023-9-1
It gives me a syntax error for the obj.Num_Files function input: "Validators can only use previously declared positional arguments, the argument being validated, or literals."

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采纳的回答

Matt J
Matt J 2023-9-1
classdef myclass
properties(Access=public)
Filenames cell {mustBeA(Filenames,"cell")} = {['Testrun_xxxx']}
Num_Files (1,1) uint32 {mustBeA(Num_Files,"uint32"), mustBePositive} = uint32(1)
end
methods
% Constructor
function obj = MY_CLASS( filenames, num_Files )
obj.Filenames = filenames;
obj.Num_Files = num_Files;
end
% function where I want to do my arguments validation
function obj = doSomething( obj, var1 )
arguments
obj
var1 (:,1) double {mustBeNumeric, mustBeSpecifiedSize( obj, var1 )}
end
end
end
end
% Validation Function
function mustBeSpecifiedSize( obj, array )
num_elements=obj.Num_Files;
if not(num_elements == numel(array))
eidType = 'mustBeSpecifiedSize:invalidNumberOfElements';
msgType = 'Inconsistency issues at the number of elements.';
throwAsCaller(MException(eidType,msgType))
end
end

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