[Matlab] Fix Entity.info

Closes #151

- Adds SetAttribute=private to Entity.info property.
- Adds getter to prevent Entity.info from getting stale.
- Removes obj.info setters from File, Dynamic and DataArray.

Author: mpsonntag

+nix/DataArray.m

@@ -160,8 +160,6 @@
         function [] = set_data_extent(obj, extent)
             fname = strcat(obj.alias, '::setDataExtent');
             nix_mx(fname, obj.nix_handle, extent);
-            % update changed dataExtent in obj.info
-            obj.info = nix_mx(strcat(obj.alias, '::describe'), obj.nix_handle);
         end
     end
 

+nix/Dynamic.m

@@ -44,7 +44,6 @@ function set_method(obj, val)
                     fname = strcat(obj.alias, '::set', upper(prop(1)), prop(2:end));
                     nix_mx(fname, obj.nix_handle, val);
                 end
-                obj.info = nix_mx(strcat(obj.alias, '::describe'), obj.nix_handle);
             end
 
             function val = get_method(obj)

+nix/Entity.m

@@ -12,6 +12,9 @@
 
     properties (Hidden)
         nix_handle
+    end
+
+    properties (SetAccess=private, GetAccess=public, Hidden)
         info
     end
 
@@ -22,9 +25,6 @@
     methods
         function obj = Entity(h)
             obj.nix_handle = h;
-
-            % fetch all object attrs
-            obj.info = nix_mx(strcat(obj.alias, '::describe'), obj.nix_handle);
         end
 
         function [] = delete(obj)
@@ -34,6 +34,11 @@
         function r = updatedAt(obj)
             r = nix_mx('Entity::updatedAt', obj.nix_handle);
         end
+
+        function r = get.info(obj)
+            fname = strcat(obj.alias, '::describe');
+            r = nix_mx(fname, obj.nix_handle);
+        end
     end
 
 end

+nix/File.m

@@ -25,8 +25,6 @@
             % assign relations
             nix.Dynamic.add_dyn_relation(obj, 'blocks', @nix.Block);
             nix.Dynamic.add_dyn_relation(obj, 'sections', @nix.Section);
-
-            obj.info = nix_mx('File::describe', obj.nix_handle);
         end
 
         % braindead...