MATLAB: How to check if object’s property is read-only.

objectproperty

Hello,

How to check if object's property is read-only or how to get the list of all the writable properties in any other way than trying to write it?

Best Answer

You can obtain that information from a metaclass object for the class,

https://www.mathworks.com/help/matlab/matlab_oop/using-class-metadata.html#btiux9r

In this case, it would look something like this:

>> meta=?myclass; pmeta=meta.PropertyList;
>> pmeta
pmeta = 
  2×1 property array with properties:
    Name
    Description
    DetailedDescription
    GetAccess
    SetAccess
    Dependent
    Constant
    Abstract
    Transient
    Hidden
    GetObservable
    SetObservable
    AbortSet
    NonCopyable
    GetMethod
    SetMethod
    HasDefault
    DefaultValue
    Validation
    DefiningClass
>> pmeta.SetAccess
ans =
    'public'
ans =
    'public'

Related Solutions

MATLAB: How To listen to a list of properties and call a method when a property of that list changes value

You have to build the meta property list from the metaclass:

p = IHaveProps;
mc = metaclass(p);
metaprops = [mc(:).Properties];
listener = event.proplistener(p, metaprops, 'PostSet', @(~,evt)disp(evt))
p.Property1 = pi
p.Property2 = exp(1)

For the class:

classdef IHaveProps < handle
      properties (SetObservable)
          Property1
          Property2
          PropertyTuesday
      end
end

MATLAB: How to find the names of private dynamic properties in MATLAB 7.8 (R2009a)

The ability to retrieve the names of Private Dynamic properties is not available in MATLAB R2009a.

As the name suggests, dynamic properties are dynamically added so that means that at some point in time (when you actually add the property) the name should be known. Please make sure you do not lose track of the name at that point. A way to ensure this could be to write you own superclass which keeps track of the property names and derive your class from this class instead of from dynamicprops; an example of such a super class is given below:

classdef mydynamicprops < dynamicprops
      properties (Access=private)
          % In this private property we save the names of the dynamically
          % added properties
          dynpropnames
      end
      methods
          function y=addprop(obj,pname)
              % First add the property to the list of dynamic properties
              obj.dynpropnames{end+1} = pname;
              % Then call the addprop method of dynamicprops, which actually adds the dynamic property 
              y=addprop@dynamicprops(obj,pname);
          end
          function y=GetDynamicProperties(obj)
              % Return a list of dynamic properties
              y=obj.dynpropnames;
          end
      end
end

Best Answer

Related Solutions

MATLAB: How To listen to a list of properties and call a method when a property of that list changes value

MATLAB: How to find the names of private dynamic properties in MATLAB 7.8 (R2009a)

Related Question