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