def relate(self, other, meaning=ACTIVE, code=ACTIVE_CODE):
links = IRelationshipLinks(self.this)
try:
link = links.find(self.my_role, other, self.other_role, self.rel_type)
except ValueError:
relate(self.rel_type,
(self.this, self.my_role),
(other, self.other_role))
link = links.find(self.my_role, other, self.other_role, self.rel_type)
link.state.set(self.filter_date, meaning=meaning, code=code)
notify(LinkStateModifiedEvent(
link, self.this, other, self.filter_date, meaning, code))
def relate(self, other, meaning=ACTIVE, code=ACTIVE_CODE):
links = IRelationshipLinks(self.this)
try:
link = links.find(self.my_role, other, self.other_role,
self.rel_type)
except ValueError:
relate(self.rel_type, (self.this, self.my_role),
(other, self.other_role))
link = links.find(self.my_role, other, self.other_role,
self.rel_type)
link.state.set(self.filter_date, meaning=meaning, code=code)
notify(
LinkStateModifiedEvent(link, self.this, other, self.filter_date,
meaning, code))
def getLinks(self):
links_1 = IRelationshipLinks(self.participant1)
links_2 = IRelationshipLinks(self.participant2)
try:
link_1_to_2 = links_1.find(self.role1, self.participant2,
self.role2, self.rel_type)
except ValueError:
raise NoSuchRelationship
try:
link_2_to_1 = links_2.find(self.role2, self.participant1,
self.role1, self.rel_type)
except ValueError:
raise NoSuchRelationship
return link_1_to_2, link_2_to_1
def getLinks(self):
links_1 = IRelationshipLinks(self.participant1)
links_2 = IRelationshipLinks(self.participant2)
try:
link_1_to_2 = links_1.find(
self.role1, self.participant2, self.role2,
self.rel_type)
except ValueError:
raise NoSuchRelationship
try:
link_2_to_1 = links_2.find(
self.role2, self.participant1, self.role1,
self.rel_type)
except ValueError:
raise NoSuchRelationship
return link_1_to_2, link_2_to_1
def state(self, other):
links = IRelationshipLinks(self.this)
try:
link = links.find(self.my_role, other, self.other_role, self.rel_type)
except ValueError:
return None
return link.state
def state(self, other):
links = IRelationshipLinks(self.this)
try:
link = links.find(self.my_role, other, self.other_role,
self.rel_type)
except ValueError:
return None
return link.state
def unrelateOnCopy(event):
"""Remove all relationships when an object is copied."""
if not IObjectCopiedEvent.providedBy(event):
return
# event.object may be a ContainedProxy
obj = getProxiedObject(event.object)
linkset = IRelationshipLinks(obj, None)
if linkset is not None:
links_to_remove = []
for link in linkset:
other_linkset = IRelationshipLinks(link.target)
try:
other_linkset.find(link.role, obj, link.my_role, link.rel_type)
except ValueError:
# The corresponding other link was not copied, so we have a
# degenerate one-sided relationship. Let's remove it
# altogether. It would not difficult to have a different
# function, cloneRelationshipsOnCopy, that would create
# a corresponding link in other_linkset.
links_to_remove.append(link)
for link in links_to_remove:
linkset.remove(link)
def unrelate(self, other):
"""Delete state on filtered date or unrelate completely if
no states left or filtered date is .all()
"""
links = IRelationshipLinks(self.this)
link = links.find(self.my_role, other, self.other_role, self.rel_type)
if self.filter_date is None:
unrelate(self.rel_type, (self.this, self.my_role),
(other, self.other_role))
return
state = link.state
date = state.closest(self.filter_date)
if date is None:
raise KeyError(self.filter_date)
del state[date]
try:
iter(state).next()
except StopIteration:
unrelate(self.rel_type, (self.this, self.my_role),
(other, self.other_role))
def unrelate(self, other):
"""Delete state on filtered date or unrelate completely if
no states left or filtered date is .all()
"""
links = IRelationshipLinks(self.this)
link = links.find(self.my_role, other, self.other_role, self.rel_type)
if self.filter_date is None:
unrelate(self.rel_type,
(self.this, self.my_role),
(other, self.other_role))
return
state = link.state
date = state.closest(self.filter_date)
if date is None:
raise KeyError(self.filter_date)
del state[date]
try:
iter(state).next()
except StopIteration:
unrelate(self.rel_type,
(self.this, self.my_role),
(other, self.other_role))
link_a = Link(link.my_role, link.target, link.role, link.rel_type, shared)
IRelationshipLinks(obj).add(link_a)
link_b = Link(link.role, obj, link.my_role, link.rel_type, shared)
IRelationshipLinks(link.target).add(link_b)
zope.event.notify(RelationshipAddedEvent(link.rel_type,
(obj, link.my_role),
(link.target, link.role),
shared))
def unrelate(rel_type, (a, role_of_a), (b, role_of_b)):
"""Break a relationship between objects `a` and `b`."""
links_of_a = IRelationshipLinks(a)
links_of_b = IRelationshipLinks(b)
try:
link_a_to_b = links_of_a.find(role_of_a, b, role_of_b, rel_type)
except ValueError:
raise NoSuchRelationship
extra_info = link_a_to_b.extra_info
zope.event.notify(BeforeRemovingRelationshipEvent(rel_type,
(a, role_of_a),
(b, role_of_b),
extra_info))
links_of_a.remove(link_a_to_b)
# If links_of_b.find raises a ValueError, our data structures are out of
# sync.
link_b_to_a = links_of_b.find(role_of_b, a, role_of_a, rel_type)
links_of_b.remove(link_b_to_a)
zope.event.notify(RelationshipRemovedEvent(rel_type,
(a, role_of_a),
(b, role_of_b),
uri_cache.cache(link.role)
link_a = Link(link.my_role, link.target, link.role, link.rel_type, shared)
IRelationshipLinks(obj).add(link_a)
link_b = Link(link.role, obj, link.my_role, link.rel_type, shared)
IRelationshipLinks(link.target).add(link_b)
zope.event.notify(
RelationshipAddedEvent(link.rel_type, (obj, link.my_role),
(link.target, link.role), shared))
def unrelate(rel_type, (a, role_of_a), (b, role_of_b)):
"""Break a relationship between objects `a` and `b`."""
links_of_a = IRelationshipLinks(a)
links_of_b = IRelationshipLinks(b)
try:
link_a_to_b = links_of_a.find(role_of_a, b, role_of_b, rel_type)
except ValueError:
raise NoSuchRelationship
extra_info = link_a_to_b.extra_info
zope.event.notify(
BeforeRemovingRelationshipEvent(rel_type, (a, role_of_a),
(b, role_of_b), extra_info))
links_of_a.remove(link_a_to_b)
# If links_of_b.find raises a ValueError, our data structures are out of
# sync.
link_b_to_a = links_of_b.find(role_of_b, a, role_of_a, rel_type)
links_of_b.remove(link_b_to_a)
zope.event.notify(
RelationshipRemovedEvent(rel_type, (a, role_of_a), (b, role_of_b),
extra_info))
