89510875c9
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2123 fd906abe-77d9-0310-91a1-e0d9ade77398
93 lines
3 KiB
Python
93 lines
3 KiB
Python
#
|
|
# Copyright (c) 2007 Helmut Merz helmutm@cy55.de
|
|
#
|
|
# 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
|
|
#
|
|
|
|
"""
|
|
Basic implementations for stateful objects and adapters.
|
|
|
|
$Id$
|
|
"""
|
|
|
|
from persistent.interfaces import IPersistent
|
|
from persistent.mapping import PersistentMapping
|
|
from zope.component import adapts
|
|
from zope.interface import implements
|
|
|
|
from cybertools.stateful.interfaces import IStateful
|
|
from cybertools.stateful.definition import statesDefinitions
|
|
|
|
|
|
class Stateful(object):
|
|
|
|
implements(IStateful)
|
|
|
|
statesDefinition = 'default'
|
|
state = None
|
|
|
|
def getState(self):
|
|
if self.state is None:
|
|
self.state = self.getStatesDefinition().initialState
|
|
return self.state
|
|
|
|
def getStateObject(self):
|
|
state = self.getState()
|
|
return self.getStatesDefinition().states[state]
|
|
|
|
def doTransition(self, transition, historyInfo=None):
|
|
sd = self.getStatesDefinition()
|
|
if isinstance(transition, basestring):
|
|
sd.doTransitionFor(self, transition)
|
|
return
|
|
available = [t.name for t in sd.getAvailableTransitionsFor(self)]
|
|
for tr in transition:
|
|
if tr in available:
|
|
sd.doTransitionFor(self, tr)
|
|
return
|
|
raise ValueError("None of the transitions '%s' is available for state '%s'."
|
|
% (repr(transition), self.getState()))
|
|
|
|
def getAvailableTransitions(self):
|
|
sd = self.getStatesDefinition()
|
|
return sd.getAvailableTransitionsFor(self)
|
|
|
|
def getStatesDefinition(self):
|
|
return statesDefinitions.get(self.statesDefinition, None)
|
|
|
|
|
|
class StatefulAdapter(Stateful):
|
|
""" An adapter for persistent objects to make them stateful.
|
|
"""
|
|
|
|
adapts(IPersistent)
|
|
|
|
statesAttributeName = '__stateful_states__'
|
|
|
|
def __init__(self, context):
|
|
self.context = context
|
|
|
|
def getState(self):
|
|
statesAttr = getattr(self.context, self.statesAttributeName, {})
|
|
return statesAttr.get(self.statesDefinition,
|
|
self.getStatesDefinition().initialState)
|
|
def setState(self, value):
|
|
statesAttr = getattr(self.context, self.statesAttributeName, None)
|
|
if statesAttr is None:
|
|
statesAttr = PersistentMapping()
|
|
setattr(self.context, self.statesAttributeName, statesAttr)
|
|
statesAttr[self.statesDefinition] = value
|
|
state = property(getState, setState)
|
|
|