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# -*- coding: utf-8 -*-
#
# AWL simulator - Dynamic attributes base class
#
# Copyright 2014 Michael Buesch <m@bues.ch>
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
from awlsim.common.compat import *
#from awlsim.core.dynattrs cimport * #@cy
class DynAttrs(object): #+cdef
"""Dynamic attributes base class.
The specified attributes are automatically initialized
to their initial values on the first read access."""
# Dict of dynamic attributes.
# Key is the attribute name.
# Value is the initial attribute value.
# If value is a callable, it is called with (self, name) as arguments
# to retrieve the actual value.
dynAttrs = {}
def __getattr__(self, name):
# Create the attribute, if it is in the dynAttrs dict.
if name in self.dynAttrs:
value = self.dynAttrs[name]
if callable(value):
value = value(self, name)
setattr(self, name, value)
return value
# Fail for all other attributes
raise AttributeError(name)
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