def __setstate__(self, state):
if _hasattribute(self, '__dict__'):
_getattribute(self, '__dict__').clear()
for name in self._p_gen_data_slots():
_delattribute(self, name)
if state is not None:
for key, value in iteritems(state):
_setattribute(self, key, value)
def _p_gen_data_slots(self):
"""Generate the sequence of names of data slots that have values.
"""
for klass in self.__class__.__mro__:
if klass is not PersistentBase:
for name in getattr(klass, "__slots__", []):
if name not in ("__weakref__", "__dict__") and _hasattribute(self, name):
yield name
def __getstate__(self):
if self._p_status == GHOST:
self._p_load_state()
state = {}
if _hasattribute(self, '__dict__'):
state.update(_getattribute(self, '__dict__'))
for name in self._p_gen_data_slots():
state[name] = _getattribute(self, name)
return state
def _p_gen_data_slots(self):
"""Generate the sequence of names of data slots that have values.
"""
for klass in self.__class__.__mro__:
if klass is not PersistentBase:
for name in getattr(klass, '__slots__', []):
if (name not in ('__weakref__', '__dict__') and
_hasattribute(self, name)):
yield name
def get(self, compute):
"""(compute) -> value
Compute the value (if necessary) and return it. 'compute' needs
to be a function that takes no arguments.
"""
# we are careful here not to mark object as UNSAVED
if _hasattribute(self, 'value'):
value = _getattribute(self, 'value')
else:
value = compute()
_setattribute(self, 'value', value)
return value
