rework property handling

+ DataType validators are shifted to __call__
+ as_json is moved to export_datatape()
+ new HasProperties Base Mixin for Modules/DataTypes
+ accessibles can be accessed via iterator of a module
+ properties are properly 'derived' and checked, are set with .setPropertyValue

remember: parameters only have properties, so use getPropertyValue()

Change-Id: Iae0273f971aacb00fe6bf05e6a4d24a6d1be881a
Reviewed-on: https://forge.frm2.tum.de/review/20635
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/lib/enum.py

@@ -289,7 +289,7 @@ class Enum(dict):
         return self[key]
 
     def __setattr__(self, key, value):
-        if self.name:
+        if self.name and key != 'name':
             raise TypeError('Enum %r can not be changed!' % self.name)
         super(Enum, self).__setattr__(key, value)
 

secop/lib/metaclass.py

@@ -0,0 +1,44 @@
+#  -*- coding: utf-8 -*-
+# *****************************************************************************
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Module authors:
+#   Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
+#
+# *****************************************************************************
+"""Define metaclass helper"""
+
+from __future__ import division, print_function
+
+try:
+    # pylint: disable=unused-import
+    from six import add_metaclass # for py2/3 compat
+except ImportError:
+    # copied from six v1.10.0
+    def add_metaclass(metaclass):
+        """Class decorator for creating a class with a metaclass."""
+        def wrapper(cls):
+            orig_vars = cls.__dict__.copy()
+            slots = orig_vars.get('__slots__')
+            if slots is not None:
+                if isinstance(slots, str):
+                    slots = [slots]
+                for slots_var in slots:
+                    orig_vars.pop(slots_var)
+            orig_vars.pop('__dict__', None)
+            orig_vars.pop('__weakref__', None)
+            return metaclass(cls.__name__, cls.__bases__, orig_vars)
+        return wrapper