154f2dcead
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1936 fd906abe-77d9-0310-91a1-e0d9ade77398
86 lines
2.6 KiB
Python
86 lines
2.6 KiB
Python
#
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# Copyright (c) 2007 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Basic implementations for stateful objects and adapters.
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$Id$
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"""
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from persistent.interfaces import IPersistent
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from persistent.mapping import PersistentMapping
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from zope.component import adapts
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from zope.interface import implements
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from cybertools.stateful.interfaces import IStateful
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from cybertools.stateful.definition import statesDefinitions
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class Stateful(object):
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implements(IStateful)
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statesDefinition = 'default'
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state = None
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def getState(self):
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if self.state is None:
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self.state = self.getStatesDefinition().initialState
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return self.state
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def getStateObject(self):
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state = self.getState()
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return self.getStatesDefinition().states[state]
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def doTransition(self, transition):
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""" execute transition.
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"""
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sd = self.getStatesDefinition()
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sd.doTransitionFor(self, transition)
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def getAvailableTransitions(self):
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sd = self.getStatesDefinition()
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return sd.getAvailableTransitionsFor(self)
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def getStatesDefinition(self):
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return statesDefinitions.get(self.statesDefinition, None)
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class StatefulAdapter(Stateful):
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""" An adapter for persistent objects to make them stateful.
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"""
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adapts(IPersistent)
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statesAttributeName = '__stateful_states__'
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def __init__(self, context):
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self.context = context
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def getState(self):
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statesAttr = getattr(self.context, self.statesAttributeName, {})
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return statesAttr.get(self.statesDefinition,
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self.getStatesDefinition().initialState)
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def setState(self, value):
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statesAttr = getattr(self.context, self.statesAttributeName, None)
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if statesAttr is None:
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statesAttr = PersistentMapping()
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setattr(self.context, self.statesAttributeName, statesAttr)
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statesAttr[self.statesDefinition] = value
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state = property(getState, setState)
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