MATLAB Object-Oriented Programming

Metadata Interface to Property Validation

For information on property validation, see “Validate Property Values” on page 8-24.

You can determine what validation applies to a property by accessing the validation

metadata. Instances of the meta.Validation class provide the following information

about property validation.

• Class requirement of the property specified as a meta.class object


• Size requirements of the property value specified as an array of
  meta.FixedDimension and meta.UnrestrictedDimension objects


• Function handles referencing validation functions applied to property values specified
  as a cell array of function handles.

For example, the ValidationExample class defines a property that must be an array of

doubles that is 1-by-any number of elements and must be a real number that is greater

than 10.

classdef ValidationExample

properties

Prop (1,:) double {mustBeReal, mustBeGreaterThan(Prop, 10)} = 200;

end

end

Access the meta.Validation object from the property's meta.property object. Get

the validation information from the meta.Validation object properties. Collection this

information into a cell array.

• Get the size information from the Size property


• Get the class name from the Class property


• Get a cell array of function handles for the validation functions from the
  ValidatorFunctions property.

mc = ?ValidationExample;

mp = findobj(mc.PropertyList,'Name','Prop');

sz = mp.Validation.Size;

len = length(sz);

dim = cell(1:len);

for k = 1:len

switch class(sz(k))

case 'meta.FixedDimension'

8 Properties — Storing Class Data