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53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
from __future__ import absolute_import
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class StateObject(object):
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"""
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An object with serializable state.
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State attributes can either be serializable types(str, tuple, bool, ...)
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or StateObject instances themselves.
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"""
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# An attribute-name -> class-or-type dict containing all attributes that
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# should be serialized. If the attribute is a class, it must implement the
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# StateObject protocol.
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_stateobject_attributes = None
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# A set() of attributes that should be ignored for short state
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_stateobject_long_attributes = frozenset([])
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def from_state(self, state):
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raise NotImplementedError()
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def get_state(self, short=False):
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"""
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Retrieve object state. If short is true, return an abbreviated
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format with long data elided.
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"""
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state = {}
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for attr, cls in self._stateobject_attributes.iteritems():
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if short and attr in self._stateobject_long_attributes:
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continue
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val = getattr(self, attr)
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if hasattr(val, "get_state"):
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state[attr] = val.get_state(short)
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else:
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state[attr] = val
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return state
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def load_state(self, state):
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"""
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Load object state from data returned by a get_state call.
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"""
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for attr, cls in self._stateobject_attributes.iteritems():
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if state.get(attr, None) is None:
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setattr(self, attr, None)
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else:
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curr = getattr(self, attr)
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if hasattr(curr, "load_state"):
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curr.load_state(state[attr])
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elif hasattr(cls, "from_state"):
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setattr(self, attr, cls.from_state(state[attr]))
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else:
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setattr(self, attr, cls(state[attr]))
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