Source code for taurus.core.evaluation.evaldevice

#!/usr/bin/env python
#############################################################################
##
# This file is part of Taurus
##
# http://taurus-scada.org
##
# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
##
# Taurus 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 Lesser General Public License for more details.
##
# You should have received a copy of the GNU Lesser General Public License
# along with Taurus.  If not, see <http://www.gnu.org/licenses/>.
##
#############################################################################

__all__ = ['EvaluationDevice']

from taurus import Factory
from taurus.core.taurusdevice import TaurusDevice
from taurus.core.util.safeeval import SafeEvaluator
from taurus.core.taurusbasetypes import TaurusDevState, TaurusAttrValue


[docs]class EvaluationDevice(TaurusDevice, SafeEvaluator): """The evaluator object. It is a :class:`TaurusDevice` and is used as the parent of :class:`EvaluationAttribute` objects for which it performs the mathematical evaluation. .. seealso:: :mod:`taurus.core.evaluation` .. warning:: In most cases this class should not be instantiated directly. Instead it should be done via the :meth:`EvaluationFactory.getDevice` """ _symbols = [] # helper class property that stores a reference to the corresponding # factory _factory = None _scheme = 'eval' def __init__(self, name='', **kw): """Object initialization.""" self.call__init__(TaurusDevice, name, **kw) safedict = {} for s in self._symbols: if hasattr(self, s): safedict[s] = getattr(self, s) SafeEvaluator.__init__(self, safedict=safedict) #-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~- # TaurusDevice necessary overwrite #-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~- def _createHWObject(self): return 'Evaluation' #-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-
[docs] def getAttribute(self, attrname): """Returns the attribute object given its name""" full_attrname = "%s;%s" % (self.getFullName(), attrname) return self.factory().getAttribute(full_attrname)
[docs] def decode(self, event_value): # TODO: Is this method ever called? (or maybe just garbage from 3.x?) if isinstance(event_value, int): # TaurusSWDevState new_sw_state = event_value else: self.info("Unexpected value to decode: %s" % str(event_value)) new_sw_state = TaurusDevState.NotReady value = TaurusAttrValue() value.rvalue = new_sw_state return value