mirror of
https://github.com/moparisthebest/SickRage
synced 2024-12-15 20:42:25 -05:00
241 lines
6.9 KiB
Python
241 lines
6.9 KiB
Python
|
# orm/identity.py
|
||
|
# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors <see AUTHORS file>
|
||
|
#
|
||
|
# This module is part of SQLAlchemy and is released under
|
||
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
||
|
|
||
|
import weakref
|
||
|
from . import attributes
|
||
|
from .. import util
|
||
|
|
||
|
class IdentityMap(dict):
|
||
|
def __init__(self):
|
||
|
self._modified = set()
|
||
|
self._wr = weakref.ref(self)
|
||
|
|
||
|
def replace(self, state):
|
||
|
raise NotImplementedError()
|
||
|
|
||
|
def add(self, state):
|
||
|
raise NotImplementedError()
|
||
|
|
||
|
def update(self, dict):
|
||
|
raise NotImplementedError("IdentityMap uses add() to insert data")
|
||
|
|
||
|
def clear(self):
|
||
|
raise NotImplementedError("IdentityMap uses remove() to remove data")
|
||
|
|
||
|
def _manage_incoming_state(self, state):
|
||
|
state._instance_dict = self._wr
|
||
|
|
||
|
if state.modified:
|
||
|
self._modified.add(state)
|
||
|
|
||
|
def _manage_removed_state(self, state):
|
||
|
del state._instance_dict
|
||
|
self._modified.discard(state)
|
||
|
|
||
|
def _dirty_states(self):
|
||
|
return self._modified
|
||
|
|
||
|
def check_modified(self):
|
||
|
"""return True if any InstanceStates present have been marked
|
||
|
as 'modified'.
|
||
|
|
||
|
"""
|
||
|
return bool(self._modified)
|
||
|
|
||
|
def has_key(self, key):
|
||
|
return key in self
|
||
|
|
||
|
def popitem(self):
|
||
|
raise NotImplementedError("IdentityMap uses remove() to remove data")
|
||
|
|
||
|
def pop(self, key, *args):
|
||
|
raise NotImplementedError("IdentityMap uses remove() to remove data")
|
||
|
|
||
|
def setdefault(self, key, default=None):
|
||
|
raise NotImplementedError("IdentityMap uses add() to insert data")
|
||
|
|
||
|
def copy(self):
|
||
|
raise NotImplementedError()
|
||
|
|
||
|
def __setitem__(self, key, value):
|
||
|
raise NotImplementedError("IdentityMap uses add() to insert data")
|
||
|
|
||
|
def __delitem__(self, key):
|
||
|
raise NotImplementedError("IdentityMap uses remove() to remove data")
|
||
|
|
||
|
|
||
|
class WeakInstanceDict(IdentityMap):
|
||
|
def __init__(self):
|
||
|
IdentityMap.__init__(self)
|
||
|
|
||
|
def __getitem__(self, key):
|
||
|
state = dict.__getitem__(self, key)
|
||
|
o = state.obj()
|
||
|
if o is None:
|
||
|
raise KeyError(key)
|
||
|
return o
|
||
|
|
||
|
def __contains__(self, key):
|
||
|
try:
|
||
|
if dict.__contains__(self, key):
|
||
|
state = dict.__getitem__(self, key)
|
||
|
o = state.obj()
|
||
|
else:
|
||
|
return False
|
||
|
except KeyError:
|
||
|
return False
|
||
|
else:
|
||
|
return o is not None
|
||
|
|
||
|
def contains_state(self, state):
|
||
|
return dict.get(self, state.key) is state
|
||
|
|
||
|
def replace(self, state):
|
||
|
if dict.__contains__(self, state.key):
|
||
|
existing = dict.__getitem__(self, state.key)
|
||
|
if existing is not state:
|
||
|
self._manage_removed_state(existing)
|
||
|
else:
|
||
|
return
|
||
|
|
||
|
dict.__setitem__(self, state.key, state)
|
||
|
self._manage_incoming_state(state)
|
||
|
|
||
|
def add(self, state):
|
||
|
key = state.key
|
||
|
# inline of self.__contains__
|
||
|
if dict.__contains__(self, key):
|
||
|
try:
|
||
|
existing_state = dict.__getitem__(self, key)
|
||
|
if existing_state is not state:
|
||
|
o = existing_state.obj()
|
||
|
if o is not None:
|
||
|
raise AssertionError(
|
||
|
"A conflicting state is already "
|
||
|
"present in the identity map for key %r"
|
||
|
% (key, ))
|
||
|
else:
|
||
|
return
|
||
|
except KeyError:
|
||
|
pass
|
||
|
dict.__setitem__(self, key, state)
|
||
|
self._manage_incoming_state(state)
|
||
|
|
||
|
def get(self, key, default=None):
|
||
|
state = dict.get(self, key, default)
|
||
|
if state is default:
|
||
|
return default
|
||
|
o = state.obj()
|
||
|
if o is None:
|
||
|
return default
|
||
|
return o
|
||
|
|
||
|
def _items(self):
|
||
|
values = self.all_states()
|
||
|
result = []
|
||
|
for state in values:
|
||
|
value = state.obj()
|
||
|
if value is not None:
|
||
|
result.append((state.key, value))
|
||
|
return result
|
||
|
|
||
|
def _values(self):
|
||
|
values = self.all_states()
|
||
|
result = []
|
||
|
for state in values:
|
||
|
value = state.obj()
|
||
|
if value is not None:
|
||
|
result.append(value)
|
||
|
|
||
|
return result
|
||
|
|
||
|
if util.py2k:
|
||
|
items = _items
|
||
|
values = _values
|
||
|
|
||
|
def iteritems(self):
|
||
|
return iter(self.items())
|
||
|
|
||
|
def itervalues(self):
|
||
|
return iter(self.values())
|
||
|
else:
|
||
|
def items(self):
|
||
|
return iter(self._items())
|
||
|
|
||
|
def values(self):
|
||
|
return iter(self._values())
|
||
|
|
||
|
def all_states(self):
|
||
|
if util.py2k:
|
||
|
return dict.values(self)
|
||
|
else:
|
||
|
return list(dict.values(self))
|
||
|
|
||
|
def discard(self, state):
|
||
|
st = dict.get(self, state.key, None)
|
||
|
if st is state:
|
||
|
dict.pop(self, state.key, None)
|
||
|
self._manage_removed_state(state)
|
||
|
|
||
|
def prune(self):
|
||
|
return 0
|
||
|
|
||
|
|
||
|
class StrongInstanceDict(IdentityMap):
|
||
|
def all_states(self):
|
||
|
return [attributes.instance_state(o) for o in self.values()]
|
||
|
|
||
|
def contains_state(self, state):
|
||
|
return (
|
||
|
state.key in self and
|
||
|
attributes.instance_state(self[state.key]) is state)
|
||
|
|
||
|
def replace(self, state):
|
||
|
if dict.__contains__(self, state.key):
|
||
|
existing = dict.__getitem__(self, state.key)
|
||
|
existing = attributes.instance_state(existing)
|
||
|
if existing is not state:
|
||
|
self._manage_removed_state(existing)
|
||
|
else:
|
||
|
return
|
||
|
|
||
|
dict.__setitem__(self, state.key, state.obj())
|
||
|
self._manage_incoming_state(state)
|
||
|
|
||
|
def add(self, state):
|
||
|
if state.key in self:
|
||
|
if attributes.instance_state(dict.__getitem__(self,
|
||
|
state.key)) is not state:
|
||
|
raise AssertionError('A conflicting state is already '
|
||
|
'present in the identity map for key %r'
|
||
|
% (state.key, ))
|
||
|
else:
|
||
|
dict.__setitem__(self, state.key, state.obj())
|
||
|
self._manage_incoming_state(state)
|
||
|
|
||
|
def discard(self, state):
|
||
|
obj = dict.get(self, state.key, None)
|
||
|
if obj is not None:
|
||
|
st = attributes.instance_state(obj)
|
||
|
if st is state:
|
||
|
dict.pop(self, state.key, None)
|
||
|
self._manage_removed_state(state)
|
||
|
|
||
|
def prune(self):
|
||
|
"""prune unreferenced, non-dirty states."""
|
||
|
|
||
|
ref_count = len(self)
|
||
|
dirty = [s.obj() for s in self.all_states() if s.modified]
|
||
|
|
||
|
# work around http://bugs.python.org/issue6149
|
||
|
keepers = weakref.WeakValueDictionary()
|
||
|
keepers.update(self)
|
||
|
|
||
|
dict.clear(self)
|
||
|
dict.update(self, keepers)
|
||
|
self.modified = bool(dirty)
|
||
|
return ref_count - len(self)
|