1141 lines
36 KiB
Python
1141 lines
36 KiB
Python
# ext/associationproxy.py
|
|
# Copyright (C) 2005-2018 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
|
|
|
|
"""Contain the ``AssociationProxy`` class.
|
|
|
|
The ``AssociationProxy`` is a Python property object which provides
|
|
transparent proxied access to the endpoint of an association object.
|
|
|
|
See the example ``examples/association/proxied_association.py``.
|
|
|
|
"""
|
|
import itertools
|
|
import operator
|
|
import weakref
|
|
from .. import exc, orm, util
|
|
from ..orm import collections, interfaces
|
|
from ..sql import not_, or_
|
|
from .. import inspect
|
|
|
|
|
|
def association_proxy(target_collection, attr, **kw):
|
|
r"""Return a Python property implementing a view of a target
|
|
attribute which references an attribute on members of the
|
|
target.
|
|
|
|
The returned value is an instance of :class:`.AssociationProxy`.
|
|
|
|
Implements a Python property representing a relationship as a collection
|
|
of simpler values, or a scalar value. The proxied property will mimic
|
|
the collection type of the target (list, dict or set), or, in the case of
|
|
a one to one relationship, a simple scalar value.
|
|
|
|
:param target_collection: Name of the attribute we'll proxy to.
|
|
This attribute is typically mapped by
|
|
:func:`~sqlalchemy.orm.relationship` to link to a target collection, but
|
|
can also be a many-to-one or non-scalar relationship.
|
|
|
|
:param attr: Attribute on the associated instance or instances we'll
|
|
proxy for.
|
|
|
|
For example, given a target collection of [obj1, obj2], a list created
|
|
by this proxy property would look like [getattr(obj1, *attr*),
|
|
getattr(obj2, *attr*)]
|
|
|
|
If the relationship is one-to-one or otherwise uselist=False, then
|
|
simply: getattr(obj, *attr*)
|
|
|
|
:param creator: optional.
|
|
|
|
When new items are added to this proxied collection, new instances of
|
|
the class collected by the target collection will be created. For list
|
|
and set collections, the target class constructor will be called with
|
|
the 'value' for the new instance. For dict types, two arguments are
|
|
passed: key and value.
|
|
|
|
If you want to construct instances differently, supply a *creator*
|
|
function that takes arguments as above and returns instances.
|
|
|
|
For scalar relationships, creator() will be called if the target is None.
|
|
If the target is present, set operations are proxied to setattr() on the
|
|
associated object.
|
|
|
|
If you have an associated object with multiple attributes, you may set
|
|
up multiple association proxies mapping to different attributes. See
|
|
the unit tests for examples, and for examples of how creator() functions
|
|
can be used to construct the scalar relationship on-demand in this
|
|
situation.
|
|
|
|
:param \*\*kw: Passes along any other keyword arguments to
|
|
:class:`.AssociationProxy`.
|
|
|
|
"""
|
|
return AssociationProxy(target_collection, attr, **kw)
|
|
|
|
|
|
ASSOCIATION_PROXY = util.symbol('ASSOCIATION_PROXY')
|
|
"""Symbol indicating an :class:`InspectionAttr` that's
|
|
of type :class:`.AssociationProxy`.
|
|
|
|
Is assigned to the :attr:`.InspectionAttr.extension_type`
|
|
attibute.
|
|
|
|
"""
|
|
|
|
|
|
class AssociationProxy(interfaces.InspectionAttrInfo):
|
|
"""A descriptor that presents a read/write view of an object attribute."""
|
|
|
|
is_attribute = False
|
|
extension_type = ASSOCIATION_PROXY
|
|
|
|
def __init__(self, target_collection, attr, creator=None,
|
|
getset_factory=None, proxy_factory=None,
|
|
proxy_bulk_set=None, info=None):
|
|
"""Construct a new :class:`.AssociationProxy`.
|
|
|
|
The :func:`.association_proxy` function is provided as the usual
|
|
entrypoint here, though :class:`.AssociationProxy` can be instantiated
|
|
and/or subclassed directly.
|
|
|
|
:param target_collection: Name of the collection we'll proxy to,
|
|
usually created with :func:`.relationship`.
|
|
|
|
:param attr: Attribute on the collected instances we'll proxy
|
|
for. For example, given a target collection of [obj1, obj2], a
|
|
list created by this proxy property would look like
|
|
[getattr(obj1, attr), getattr(obj2, attr)]
|
|
|
|
:param creator: Optional. When new items are added to this proxied
|
|
collection, new instances of the class collected by the target
|
|
collection will be created. For list and set collections, the
|
|
target class constructor will be called with the 'value' for the
|
|
new instance. For dict types, two arguments are passed:
|
|
key and value.
|
|
|
|
If you want to construct instances differently, supply a 'creator'
|
|
function that takes arguments as above and returns instances.
|
|
|
|
:param getset_factory: Optional. Proxied attribute access is
|
|
automatically handled by routines that get and set values based on
|
|
the `attr` argument for this proxy.
|
|
|
|
If you would like to customize this behavior, you may supply a
|
|
`getset_factory` callable that produces a tuple of `getter` and
|
|
`setter` functions. The factory is called with two arguments, the
|
|
abstract type of the underlying collection and this proxy instance.
|
|
|
|
:param proxy_factory: Optional. The type of collection to emulate is
|
|
determined by sniffing the target collection. If your collection
|
|
type can't be determined by duck typing or you'd like to use a
|
|
different collection implementation, you may supply a factory
|
|
function to produce those collections. Only applicable to
|
|
non-scalar relationships.
|
|
|
|
:param proxy_bulk_set: Optional, use with proxy_factory. See
|
|
the _set() method for details.
|
|
|
|
:param info: optional, will be assigned to
|
|
:attr:`.AssociationProxy.info` if present.
|
|
|
|
.. versionadded:: 1.0.9
|
|
|
|
"""
|
|
self.target_collection = target_collection
|
|
self.value_attr = attr
|
|
self.creator = creator
|
|
self.getset_factory = getset_factory
|
|
self.proxy_factory = proxy_factory
|
|
self.proxy_bulk_set = proxy_bulk_set
|
|
|
|
self.owning_class = None
|
|
self.key = '_%s_%s_%s' % (
|
|
type(self).__name__, target_collection, id(self))
|
|
self.collection_class = None
|
|
if info:
|
|
self.info = info
|
|
|
|
@property
|
|
def remote_attr(self):
|
|
"""The 'remote' :class:`.MapperProperty` referenced by this
|
|
:class:`.AssociationProxy`.
|
|
|
|
.. versionadded:: 0.7.3
|
|
|
|
See also:
|
|
|
|
:attr:`.AssociationProxy.attr`
|
|
|
|
:attr:`.AssociationProxy.local_attr`
|
|
|
|
"""
|
|
return getattr(self.target_class, self.value_attr)
|
|
|
|
@property
|
|
def local_attr(self):
|
|
"""The 'local' :class:`.MapperProperty` referenced by this
|
|
:class:`.AssociationProxy`.
|
|
|
|
.. versionadded:: 0.7.3
|
|
|
|
See also:
|
|
|
|
:attr:`.AssociationProxy.attr`
|
|
|
|
:attr:`.AssociationProxy.remote_attr`
|
|
|
|
"""
|
|
return getattr(self.owning_class, self.target_collection)
|
|
|
|
@property
|
|
def attr(self):
|
|
"""Return a tuple of ``(local_attr, remote_attr)``.
|
|
|
|
This attribute is convenient when specifying a join
|
|
using :meth:`.Query.join` across two relationships::
|
|
|
|
sess.query(Parent).join(*Parent.proxied.attr)
|
|
|
|
.. versionadded:: 0.7.3
|
|
|
|
See also:
|
|
|
|
:attr:`.AssociationProxy.local_attr`
|
|
|
|
:attr:`.AssociationProxy.remote_attr`
|
|
|
|
"""
|
|
return (self.local_attr, self.remote_attr)
|
|
|
|
def _get_property(self):
|
|
owning_class = self.owning_class
|
|
if owning_class is None:
|
|
raise exc.InvalidRequestError(
|
|
"This association proxy has no mapped owning class; "
|
|
"can't locate a mapped property")
|
|
return (orm.class_mapper(owning_class).
|
|
get_property(self.target_collection))
|
|
|
|
@util.memoized_property
|
|
def target_class(self):
|
|
"""The intermediary class handled by this :class:`.AssociationProxy`.
|
|
|
|
Intercepted append/set/assignment events will result
|
|
in the generation of new instances of this class.
|
|
|
|
"""
|
|
return self._get_property().mapper.class_
|
|
|
|
@util.memoized_property
|
|
def scalar(self):
|
|
"""Return ``True`` if this :class:`.AssociationProxy` proxies a scalar
|
|
relationship on the local side."""
|
|
|
|
scalar = not self._get_property().uselist
|
|
if scalar:
|
|
self._initialize_scalar_accessors()
|
|
return scalar
|
|
|
|
@util.memoized_property
|
|
def _value_is_scalar(self):
|
|
return not self._get_property().\
|
|
mapper.get_property(self.value_attr).uselist
|
|
|
|
@util.memoized_property
|
|
def _target_is_object(self):
|
|
return getattr(self.target_class, self.value_attr).impl.uses_objects
|
|
|
|
def _calc_owner(self, obj, class_):
|
|
if obj is not None and class_ is None:
|
|
target_cls = type(obj)
|
|
elif class_ is not None:
|
|
target_cls = class_
|
|
else:
|
|
return
|
|
|
|
# we might be getting invoked for a subclass
|
|
# that is not mapped yet, in some declarative situations.
|
|
# save until we are mapped
|
|
try:
|
|
insp = inspect(target_cls)
|
|
except exc.NoInspectionAvailable:
|
|
# can't find a mapper, don't set owner. if we are a not-yet-mapped
|
|
# subclass, we can also scan through __mro__ to find a mapped
|
|
# class, but instead just wait for us to be called again against a
|
|
# mapped class normally.
|
|
return
|
|
|
|
# note we can get our real .key here too
|
|
owner = insp.mapper.class_manager._locate_owning_manager(self)
|
|
if owner is not None:
|
|
self.owning_class = owner.class_
|
|
else:
|
|
# the proxy is attached to a class that is not mapped
|
|
# (like a mixin), we are mapped, so, it's us.
|
|
self.owning_class = target_cls
|
|
|
|
def __get__(self, obj, class_):
|
|
if self.owning_class is None:
|
|
self._calc_owner(obj, class_)
|
|
|
|
if obj is None:
|
|
return self
|
|
|
|
if self.scalar:
|
|
target = getattr(obj, self.target_collection)
|
|
return self._scalar_get(target)
|
|
else:
|
|
try:
|
|
# If the owning instance is reborn (orm session resurrect,
|
|
# etc.), refresh the proxy cache.
|
|
creator_id, proxy = getattr(obj, self.key)
|
|
if id(obj) == creator_id:
|
|
return proxy
|
|
except AttributeError:
|
|
pass
|
|
proxy = self._new(_lazy_collection(obj, self.target_collection))
|
|
setattr(obj, self.key, (id(obj), proxy))
|
|
return proxy
|
|
|
|
def __set__(self, obj, values):
|
|
if self.owning_class is None:
|
|
self._calc_owner(obj, None)
|
|
|
|
if self.scalar:
|
|
creator = self.creator and self.creator or self.target_class
|
|
target = getattr(obj, self.target_collection)
|
|
if target is None:
|
|
setattr(obj, self.target_collection, creator(values))
|
|
else:
|
|
self._scalar_set(target, values)
|
|
else:
|
|
proxy = self.__get__(obj, None)
|
|
if proxy is not values:
|
|
proxy.clear()
|
|
self._set(proxy, values)
|
|
|
|
def __delete__(self, obj):
|
|
if self.owning_class is None:
|
|
self._calc_owner(obj, None)
|
|
|
|
delattr(obj, self.key)
|
|
|
|
def _initialize_scalar_accessors(self):
|
|
if self.getset_factory:
|
|
get, set = self.getset_factory(None, self)
|
|
else:
|
|
get, set = self._default_getset(None)
|
|
self._scalar_get, self._scalar_set = get, set
|
|
|
|
def _default_getset(self, collection_class):
|
|
attr = self.value_attr
|
|
_getter = operator.attrgetter(attr)
|
|
getter = lambda target: _getter(target) if target is not None else None
|
|
if collection_class is dict:
|
|
setter = lambda o, k, v: setattr(o, attr, v)
|
|
else:
|
|
setter = lambda o, v: setattr(o, attr, v)
|
|
return getter, setter
|
|
|
|
def _new(self, lazy_collection):
|
|
creator = self.creator and self.creator or self.target_class
|
|
self.collection_class = util.duck_type_collection(lazy_collection())
|
|
|
|
if self.proxy_factory:
|
|
return self.proxy_factory(
|
|
lazy_collection, creator, self.value_attr, self)
|
|
|
|
if self.getset_factory:
|
|
getter, setter = self.getset_factory(self.collection_class, self)
|
|
else:
|
|
getter, setter = self._default_getset(self.collection_class)
|
|
|
|
if self.collection_class is list:
|
|
return _AssociationList(
|
|
lazy_collection, creator, getter, setter, self)
|
|
elif self.collection_class is dict:
|
|
return _AssociationDict(
|
|
lazy_collection, creator, getter, setter, self)
|
|
elif self.collection_class is set:
|
|
return _AssociationSet(
|
|
lazy_collection, creator, getter, setter, self)
|
|
else:
|
|
raise exc.ArgumentError(
|
|
'could not guess which interface to use for '
|
|
'collection_class "%s" backing "%s"; specify a '
|
|
'proxy_factory and proxy_bulk_set manually' %
|
|
(self.collection_class.__name__, self.target_collection))
|
|
|
|
def _inflate(self, proxy):
|
|
creator = self.creator and self.creator or self.target_class
|
|
|
|
if self.getset_factory:
|
|
getter, setter = self.getset_factory(self.collection_class, self)
|
|
else:
|
|
getter, setter = self._default_getset(self.collection_class)
|
|
|
|
proxy.creator = creator
|
|
proxy.getter = getter
|
|
proxy.setter = setter
|
|
|
|
def _set(self, proxy, values):
|
|
if self.proxy_bulk_set:
|
|
self.proxy_bulk_set(proxy, values)
|
|
elif self.collection_class is list:
|
|
proxy.extend(values)
|
|
elif self.collection_class is dict:
|
|
proxy.update(values)
|
|
elif self.collection_class is set:
|
|
proxy.update(values)
|
|
else:
|
|
raise exc.ArgumentError(
|
|
'no proxy_bulk_set supplied for custom '
|
|
'collection_class implementation')
|
|
|
|
@property
|
|
def _comparator(self):
|
|
return self._get_property().comparator
|
|
|
|
@util.memoized_property
|
|
def _unwrap_target_assoc_proxy(self):
|
|
attr = getattr(self.target_class, self.value_attr)
|
|
if isinstance(attr, AssociationProxy):
|
|
return attr
|
|
return None
|
|
|
|
def _criterion_exists(self, criterion=None, **kwargs):
|
|
is_has = kwargs.pop('is_has', None)
|
|
|
|
target_assoc = self._unwrap_target_assoc_proxy
|
|
if target_assoc is not None:
|
|
inner = target_assoc._criterion_exists(
|
|
criterion=criterion, **kwargs)
|
|
return self._comparator._criterion_exists(inner)
|
|
|
|
if self._target_is_object:
|
|
prop = getattr(self.target_class, self.value_attr)
|
|
value_expr = prop._criterion_exists(criterion, **kwargs)
|
|
else:
|
|
if kwargs:
|
|
raise exc.ArgumentError(
|
|
"Can't apply keyword arguments to column-targeted "
|
|
"association proxy; use =="
|
|
)
|
|
elif is_has and criterion is not None:
|
|
raise exc.ArgumentError(
|
|
"Non-empty has() not allowed for "
|
|
"column-targeted association proxy; use =="
|
|
)
|
|
|
|
value_expr = criterion
|
|
|
|
return self._comparator._criterion_exists(value_expr)
|
|
|
|
def any(self, criterion=None, **kwargs):
|
|
"""Produce a proxied 'any' expression using EXISTS.
|
|
|
|
This expression will be a composed product
|
|
using the :meth:`.RelationshipProperty.Comparator.any`
|
|
and/or :meth:`.RelationshipProperty.Comparator.has`
|
|
operators of the underlying proxied attributes.
|
|
|
|
"""
|
|
if self._unwrap_target_assoc_proxy is None and (
|
|
self.scalar and (
|
|
not self._target_is_object or self._value_is_scalar)
|
|
):
|
|
raise exc.InvalidRequestError(
|
|
"'any()' not implemented for scalar "
|
|
"attributes. Use has()."
|
|
)
|
|
return self._criterion_exists(
|
|
criterion=criterion, is_has=False, **kwargs)
|
|
|
|
def has(self, criterion=None, **kwargs):
|
|
"""Produce a proxied 'has' expression using EXISTS.
|
|
|
|
This expression will be a composed product
|
|
using the :meth:`.RelationshipProperty.Comparator.any`
|
|
and/or :meth:`.RelationshipProperty.Comparator.has`
|
|
operators of the underlying proxied attributes.
|
|
|
|
"""
|
|
if self._unwrap_target_assoc_proxy is None and (
|
|
not self.scalar or (
|
|
self._target_is_object and not self._value_is_scalar)
|
|
):
|
|
raise exc.InvalidRequestError(
|
|
"'has()' not implemented for collections. "
|
|
"Use any().")
|
|
return self._criterion_exists(
|
|
criterion=criterion, is_has=True, **kwargs)
|
|
|
|
def contains(self, obj):
|
|
"""Produce a proxied 'contains' expression using EXISTS.
|
|
|
|
This expression will be a composed product
|
|
using the :meth:`.RelationshipProperty.Comparator.any`
|
|
, :meth:`.RelationshipProperty.Comparator.has`,
|
|
and/or :meth:`.RelationshipProperty.Comparator.contains`
|
|
operators of the underlying proxied attributes.
|
|
"""
|
|
|
|
target_assoc = self._unwrap_target_assoc_proxy
|
|
if target_assoc is not None:
|
|
return self._comparator._criterion_exists(
|
|
target_assoc.contains(obj)
|
|
if not target_assoc.scalar else target_assoc == obj
|
|
)
|
|
elif self._target_is_object and self.scalar and \
|
|
not self._value_is_scalar:
|
|
return self._comparator.has(
|
|
getattr(self.target_class, self.value_attr).contains(obj)
|
|
)
|
|
elif self._target_is_object and self.scalar and \
|
|
self._value_is_scalar:
|
|
raise exc.InvalidRequestError(
|
|
"contains() doesn't apply to a scalar endpoint; use ==")
|
|
else:
|
|
|
|
return self._comparator._criterion_exists(**{self.value_attr: obj})
|
|
|
|
def __eq__(self, obj):
|
|
# note the has() here will fail for collections; eq_()
|
|
# is only allowed with a scalar.
|
|
if obj is None:
|
|
return or_(
|
|
self._comparator.has(**{self.value_attr: obj}),
|
|
self._comparator == None
|
|
)
|
|
else:
|
|
return self._comparator.has(**{self.value_attr: obj})
|
|
|
|
def __ne__(self, obj):
|
|
# note the has() here will fail for collections; eq_()
|
|
# is only allowed with a scalar.
|
|
return self._comparator.has(
|
|
getattr(self.target_class, self.value_attr) != obj)
|
|
|
|
def __repr__(self):
|
|
return "AssociationProxy(%r, %r)" % (self.target_collection, self.value_attr)
|
|
|
|
|
|
class _lazy_collection(object):
|
|
def __init__(self, obj, target):
|
|
self.ref = weakref.ref(obj)
|
|
self.target = target
|
|
|
|
def __call__(self):
|
|
obj = self.ref()
|
|
if obj is None:
|
|
raise exc.InvalidRequestError(
|
|
"stale association proxy, parent object has gone out of "
|
|
"scope")
|
|
return getattr(obj, self.target)
|
|
|
|
def __getstate__(self):
|
|
return {'obj': self.ref(), 'target': self.target}
|
|
|
|
def __setstate__(self, state):
|
|
self.ref = weakref.ref(state['obj'])
|
|
self.target = state['target']
|
|
|
|
|
|
class _AssociationCollection(object):
|
|
def __init__(self, lazy_collection, creator, getter, setter, parent):
|
|
"""Constructs an _AssociationCollection.
|
|
|
|
This will always be a subclass of either _AssociationList,
|
|
_AssociationSet, or _AssociationDict.
|
|
|
|
lazy_collection
|
|
A callable returning a list-based collection of entities (usually an
|
|
object attribute managed by a SQLAlchemy relationship())
|
|
|
|
creator
|
|
A function that creates new target entities. Given one parameter:
|
|
value. This assertion is assumed::
|
|
|
|
obj = creator(somevalue)
|
|
assert getter(obj) == somevalue
|
|
|
|
getter
|
|
A function. Given an associated object, return the 'value'.
|
|
|
|
setter
|
|
A function. Given an associated object and a value, store that
|
|
value on the object.
|
|
|
|
"""
|
|
self.lazy_collection = lazy_collection
|
|
self.creator = creator
|
|
self.getter = getter
|
|
self.setter = setter
|
|
self.parent = parent
|
|
|
|
col = property(lambda self: self.lazy_collection())
|
|
|
|
def __len__(self):
|
|
return len(self.col)
|
|
|
|
def __bool__(self):
|
|
return bool(self.col)
|
|
|
|
__nonzero__ = __bool__
|
|
|
|
def __getstate__(self):
|
|
return {'parent': self.parent, 'lazy_collection': self.lazy_collection}
|
|
|
|
def __setstate__(self, state):
|
|
self.parent = state['parent']
|
|
self.lazy_collection = state['lazy_collection']
|
|
self.parent._inflate(self)
|
|
|
|
|
|
class _AssociationList(_AssociationCollection):
|
|
"""Generic, converting, list-to-list proxy."""
|
|
|
|
def _create(self, value):
|
|
return self.creator(value)
|
|
|
|
def _get(self, object):
|
|
return self.getter(object)
|
|
|
|
def _set(self, object, value):
|
|
return self.setter(object, value)
|
|
|
|
def __getitem__(self, index):
|
|
if not isinstance(index, slice):
|
|
return self._get(self.col[index])
|
|
else:
|
|
return [self._get(member) for member in self.col[index]]
|
|
|
|
def __setitem__(self, index, value):
|
|
if not isinstance(index, slice):
|
|
self._set(self.col[index], value)
|
|
else:
|
|
if index.stop is None:
|
|
stop = len(self)
|
|
elif index.stop < 0:
|
|
stop = len(self) + index.stop
|
|
else:
|
|
stop = index.stop
|
|
step = index.step or 1
|
|
|
|
start = index.start or 0
|
|
rng = list(range(index.start or 0, stop, step))
|
|
if step == 1:
|
|
for i in rng:
|
|
del self[start]
|
|
i = start
|
|
for item in value:
|
|
self.insert(i, item)
|
|
i += 1
|
|
else:
|
|
if len(value) != len(rng):
|
|
raise ValueError(
|
|
"attempt to assign sequence of size %s to "
|
|
"extended slice of size %s" % (len(value),
|
|
len(rng)))
|
|
for i, item in zip(rng, value):
|
|
self._set(self.col[i], item)
|
|
|
|
def __delitem__(self, index):
|
|
del self.col[index]
|
|
|
|
def __contains__(self, value):
|
|
for member in self.col:
|
|
# testlib.pragma exempt:__eq__
|
|
if self._get(member) == value:
|
|
return True
|
|
return False
|
|
|
|
def __getslice__(self, start, end):
|
|
return [self._get(member) for member in self.col[start:end]]
|
|
|
|
def __setslice__(self, start, end, values):
|
|
members = [self._create(v) for v in values]
|
|
self.col[start:end] = members
|
|
|
|
def __delslice__(self, start, end):
|
|
del self.col[start:end]
|
|
|
|
def __iter__(self):
|
|
"""Iterate over proxied values.
|
|
|
|
For the actual domain objects, iterate over .col instead or
|
|
just use the underlying collection directly from its property
|
|
on the parent.
|
|
"""
|
|
|
|
for member in self.col:
|
|
yield self._get(member)
|
|
return
|
|
|
|
def append(self, value):
|
|
col = self.col
|
|
item = self._create(value)
|
|
col.append(item)
|
|
|
|
def count(self, value):
|
|
return sum([1 for _ in
|
|
util.itertools_filter(lambda v: v == value, iter(self))])
|
|
|
|
def extend(self, values):
|
|
for v in values:
|
|
self.append(v)
|
|
|
|
def insert(self, index, value):
|
|
self.col[index:index] = [self._create(value)]
|
|
|
|
def pop(self, index=-1):
|
|
return self.getter(self.col.pop(index))
|
|
|
|
def remove(self, value):
|
|
for i, val in enumerate(self):
|
|
if val == value:
|
|
del self.col[i]
|
|
return
|
|
raise ValueError("value not in list")
|
|
|
|
def reverse(self):
|
|
"""Not supported, use reversed(mylist)"""
|
|
|
|
raise NotImplementedError
|
|
|
|
def sort(self):
|
|
"""Not supported, use sorted(mylist)"""
|
|
|
|
raise NotImplementedError
|
|
|
|
def clear(self):
|
|
del self.col[0:len(self.col)]
|
|
|
|
def __eq__(self, other):
|
|
return list(self) == other
|
|
|
|
def __ne__(self, other):
|
|
return list(self) != other
|
|
|
|
def __lt__(self, other):
|
|
return list(self) < other
|
|
|
|
def __le__(self, other):
|
|
return list(self) <= other
|
|
|
|
def __gt__(self, other):
|
|
return list(self) > other
|
|
|
|
def __ge__(self, other):
|
|
return list(self) >= other
|
|
|
|
def __cmp__(self, other):
|
|
return cmp(list(self), other)
|
|
|
|
def __add__(self, iterable):
|
|
try:
|
|
other = list(iterable)
|
|
except TypeError:
|
|
return NotImplemented
|
|
return list(self) + other
|
|
|
|
def __radd__(self, iterable):
|
|
try:
|
|
other = list(iterable)
|
|
except TypeError:
|
|
return NotImplemented
|
|
return other + list(self)
|
|
|
|
def __mul__(self, n):
|
|
if not isinstance(n, int):
|
|
return NotImplemented
|
|
return list(self) * n
|
|
__rmul__ = __mul__
|
|
|
|
def __iadd__(self, iterable):
|
|
self.extend(iterable)
|
|
return self
|
|
|
|
def __imul__(self, n):
|
|
# unlike a regular list *=, proxied __imul__ will generate unique
|
|
# backing objects for each copy. *= on proxied lists is a bit of
|
|
# a stretch anyhow, and this interpretation of the __imul__ contract
|
|
# is more plausibly useful than copying the backing objects.
|
|
if not isinstance(n, int):
|
|
return NotImplemented
|
|
if n == 0:
|
|
self.clear()
|
|
elif n > 1:
|
|
self.extend(list(self) * (n - 1))
|
|
return self
|
|
|
|
def copy(self):
|
|
return list(self)
|
|
|
|
def __repr__(self):
|
|
return repr(list(self))
|
|
|
|
def __hash__(self):
|
|
raise TypeError("%s objects are unhashable" % type(self).__name__)
|
|
|
|
for func_name, func in list(locals().items()):
|
|
if (util.callable(func) and func.__name__ == func_name and
|
|
not func.__doc__ and hasattr(list, func_name)):
|
|
func.__doc__ = getattr(list, func_name).__doc__
|
|
del func_name, func
|
|
|
|
|
|
_NotProvided = util.symbol('_NotProvided')
|
|
|
|
|
|
class _AssociationDict(_AssociationCollection):
|
|
"""Generic, converting, dict-to-dict proxy."""
|
|
|
|
def _create(self, key, value):
|
|
return self.creator(key, value)
|
|
|
|
def _get(self, object):
|
|
return self.getter(object)
|
|
|
|
def _set(self, object, key, value):
|
|
return self.setter(object, key, value)
|
|
|
|
def __getitem__(self, key):
|
|
return self._get(self.col[key])
|
|
|
|
def __setitem__(self, key, value):
|
|
if key in self.col:
|
|
self._set(self.col[key], key, value)
|
|
else:
|
|
self.col[key] = self._create(key, value)
|
|
|
|
def __delitem__(self, key):
|
|
del self.col[key]
|
|
|
|
def __contains__(self, key):
|
|
# testlib.pragma exempt:__hash__
|
|
return key in self.col
|
|
|
|
def has_key(self, key):
|
|
# testlib.pragma exempt:__hash__
|
|
return key in self.col
|
|
|
|
def __iter__(self):
|
|
return iter(self.col.keys())
|
|
|
|
def clear(self):
|
|
self.col.clear()
|
|
|
|
def __eq__(self, other):
|
|
return dict(self) == other
|
|
|
|
def __ne__(self, other):
|
|
return dict(self) != other
|
|
|
|
def __lt__(self, other):
|
|
return dict(self) < other
|
|
|
|
def __le__(self, other):
|
|
return dict(self) <= other
|
|
|
|
def __gt__(self, other):
|
|
return dict(self) > other
|
|
|
|
def __ge__(self, other):
|
|
return dict(self) >= other
|
|
|
|
def __cmp__(self, other):
|
|
return cmp(dict(self), other)
|
|
|
|
def __repr__(self):
|
|
return repr(dict(self.items()))
|
|
|
|
def get(self, key, default=None):
|
|
try:
|
|
return self[key]
|
|
except KeyError:
|
|
return default
|
|
|
|
def setdefault(self, key, default=None):
|
|
if key not in self.col:
|
|
self.col[key] = self._create(key, default)
|
|
return default
|
|
else:
|
|
return self[key]
|
|
|
|
def keys(self):
|
|
return self.col.keys()
|
|
|
|
if util.py2k:
|
|
def iteritems(self):
|
|
return ((key, self._get(self.col[key])) for key in self.col)
|
|
|
|
def itervalues(self):
|
|
return (self._get(self.col[key]) for key in self.col)
|
|
|
|
def iterkeys(self):
|
|
return self.col.iterkeys()
|
|
|
|
def values(self):
|
|
return [self._get(member) for member in self.col.values()]
|
|
|
|
def items(self):
|
|
return [(k, self._get(self.col[k])) for k in self]
|
|
else:
|
|
def items(self):
|
|
return ((key, self._get(self.col[key])) for key in self.col)
|
|
|
|
def values(self):
|
|
return (self._get(self.col[key]) for key in self.col)
|
|
|
|
def pop(self, key, default=_NotProvided):
|
|
if default is _NotProvided:
|
|
member = self.col.pop(key)
|
|
else:
|
|
member = self.col.pop(key, default)
|
|
return self._get(member)
|
|
|
|
def popitem(self):
|
|
item = self.col.popitem()
|
|
return (item[0], self._get(item[1]))
|
|
|
|
def update(self, *a, **kw):
|
|
if len(a) > 1:
|
|
raise TypeError('update expected at most 1 arguments, got %i' %
|
|
len(a))
|
|
elif len(a) == 1:
|
|
seq_or_map = a[0]
|
|
# discern dict from sequence - took the advice from
|
|
# http://www.voidspace.org.uk/python/articles/duck_typing.shtml
|
|
# still not perfect :(
|
|
if hasattr(seq_or_map, 'keys'):
|
|
for item in seq_or_map:
|
|
self[item] = seq_or_map[item]
|
|
else:
|
|
try:
|
|
for k, v in seq_or_map:
|
|
self[k] = v
|
|
except ValueError:
|
|
raise ValueError(
|
|
"dictionary update sequence "
|
|
"requires 2-element tuples")
|
|
|
|
for key, value in kw:
|
|
self[key] = value
|
|
|
|
def copy(self):
|
|
return dict(self.items())
|
|
|
|
def __hash__(self):
|
|
raise TypeError("%s objects are unhashable" % type(self).__name__)
|
|
|
|
for func_name, func in list(locals().items()):
|
|
if (util.callable(func) and func.__name__ == func_name and
|
|
not func.__doc__ and hasattr(dict, func_name)):
|
|
func.__doc__ = getattr(dict, func_name).__doc__
|
|
del func_name, func
|
|
|
|
|
|
class _AssociationSet(_AssociationCollection):
|
|
"""Generic, converting, set-to-set proxy."""
|
|
|
|
def _create(self, value):
|
|
return self.creator(value)
|
|
|
|
def _get(self, object):
|
|
return self.getter(object)
|
|
|
|
def _set(self, object, value):
|
|
return self.setter(object, value)
|
|
|
|
def __len__(self):
|
|
return len(self.col)
|
|
|
|
def __bool__(self):
|
|
if self.col:
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
__nonzero__ = __bool__
|
|
|
|
def __contains__(self, value):
|
|
for member in self.col:
|
|
# testlib.pragma exempt:__eq__
|
|
if self._get(member) == value:
|
|
return True
|
|
return False
|
|
|
|
def __iter__(self):
|
|
"""Iterate over proxied values.
|
|
|
|
For the actual domain objects, iterate over .col instead or just use
|
|
the underlying collection directly from its property on the parent.
|
|
|
|
"""
|
|
for member in self.col:
|
|
yield self._get(member)
|
|
return
|
|
|
|
def add(self, value):
|
|
if value not in self:
|
|
self.col.add(self._create(value))
|
|
|
|
# for discard and remove, choosing a more expensive check strategy rather
|
|
# than call self.creator()
|
|
def discard(self, value):
|
|
for member in self.col:
|
|
if self._get(member) == value:
|
|
self.col.discard(member)
|
|
break
|
|
|
|
def remove(self, value):
|
|
for member in self.col:
|
|
if self._get(member) == value:
|
|
self.col.discard(member)
|
|
return
|
|
raise KeyError(value)
|
|
|
|
def pop(self):
|
|
if not self.col:
|
|
raise KeyError('pop from an empty set')
|
|
member = self.col.pop()
|
|
return self._get(member)
|
|
|
|
def update(self, other):
|
|
for value in other:
|
|
self.add(value)
|
|
|
|
def __ior__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
for value in other:
|
|
self.add(value)
|
|
return self
|
|
|
|
def _set(self):
|
|
return set(iter(self))
|
|
|
|
def union(self, other):
|
|
return set(self).union(other)
|
|
|
|
__or__ = union
|
|
|
|
def difference(self, other):
|
|
return set(self).difference(other)
|
|
|
|
__sub__ = difference
|
|
|
|
def difference_update(self, other):
|
|
for value in other:
|
|
self.discard(value)
|
|
|
|
def __isub__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
for value in other:
|
|
self.discard(value)
|
|
return self
|
|
|
|
def intersection(self, other):
|
|
return set(self).intersection(other)
|
|
|
|
__and__ = intersection
|
|
|
|
def intersection_update(self, other):
|
|
want, have = self.intersection(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
|
|
def __iand__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
want, have = self.intersection(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
return self
|
|
|
|
def symmetric_difference(self, other):
|
|
return set(self).symmetric_difference(other)
|
|
|
|
__xor__ = symmetric_difference
|
|
|
|
def symmetric_difference_update(self, other):
|
|
want, have = self.symmetric_difference(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
|
|
def __ixor__(self, other):
|
|
if not collections._set_binops_check_strict(self, other):
|
|
return NotImplemented
|
|
want, have = self.symmetric_difference(other), set(self)
|
|
|
|
remove, add = have - want, want - have
|
|
|
|
for value in remove:
|
|
self.remove(value)
|
|
for value in add:
|
|
self.add(value)
|
|
return self
|
|
|
|
def issubset(self, other):
|
|
return set(self).issubset(other)
|
|
|
|
def issuperset(self, other):
|
|
return set(self).issuperset(other)
|
|
|
|
def clear(self):
|
|
self.col.clear()
|
|
|
|
def copy(self):
|
|
return set(self)
|
|
|
|
def __eq__(self, other):
|
|
return set(self) == other
|
|
|
|
def __ne__(self, other):
|
|
return set(self) != other
|
|
|
|
def __lt__(self, other):
|
|
return set(self) < other
|
|
|
|
def __le__(self, other):
|
|
return set(self) <= other
|
|
|
|
def __gt__(self, other):
|
|
return set(self) > other
|
|
|
|
def __ge__(self, other):
|
|
return set(self) >= other
|
|
|
|
def __repr__(self):
|
|
return repr(set(self))
|
|
|
|
def __hash__(self):
|
|
raise TypeError("%s objects are unhashable" % type(self).__name__)
|
|
|
|
for func_name, func in list(locals().items()):
|
|
if (util.callable(func) and func.__name__ == func_name and
|
|
not func.__doc__ and hasattr(set, func_name)):
|
|
func.__doc__ = getattr(set, func_name).__doc__
|
|
del func_name, func
|