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from __future__ import with_statement
import threading
class StateMachine(object):
def __init__(self, states=[], groups=[]):
self.lock = threading.Lock()
self.__state = {}
self.__default_state = {}
self.__group = {}
self.addStates(states)
self.addGroups(groups)
def addStates(self, states):
with self.lock:
for state in states:
if state in self.__state or state in self.__group:
raise IndexError("The state or group '%s' is already in the StateMachine." % state)
self.__state[state] = states[state]
self.__default_state[state] = states[state]
def addGroups(self, groups):
with self.lock:
for gstate in groups:
if gstate in self.__state or gstate in self.__group:
raise IndexError("The key or group '%s' is already in the StateMachine." % gstate)
for state in groups[gstate]:
if self.__state.has_key(state):
raise IndexError("The group %s contains a key %s which is not set in the StateMachine." % (gstate, state))
self.__group[gstate] = groups[gstate]
def set(self, state, status):
with self.lock:
if state in self.__state:
self.__state[state] = bool(status)
else:
raise KeyError("StateMachine does not contain state %s." % state)
def __getitem__(self, key):
if key in self.__group:
for state in self.__group[key]:
if not self.__state[state]:
return False
return True
return self.__state[key]
def __getattr__(self, attr):
return self.__getitem__(attr)
def reset(self):
self.__state = self.__default_state
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