def sizeForDisplay(self):
"""See `ISized`.
"""
num_items = len(self._container)
if num_items == 1:
return _('1 item')
return _('${items} items', mapping={'items': str(num_items)})
def checkName(self, name, object):
if isinstance(name, str):
name = unicode(name)
elif not isinstance(name, unicode):
raise TypeError("Invalid name type", type(name))
if not name:
raise ValueError(
_("An empty name was provided. Names cannot be empty."))
if name[:1] in '+@' or '/' in name:
raise ValueError(
_("Names cannot begin with '+' or '@' or contain '/'"))
reserved = IReservedNames(self.context, None)
if reserved is not None:
if name in reserved.reservedNames:
raise NameReserved(name)
if name in self.context:
raise KeyError(
_("The given name is already being used"))
return True
def checkObject(container, name, object):
"""Check containment constraints for an object and container.
"""
# check __setitem__ precondition
containerProvided = providedBy(container)
__setitem__ = containerProvided.get('__setitem__')
if __setitem__ is not None:
precondition = __setitem__.queryTaggedValue('precondition')
if precondition is not None:
precondition(container, name, object)
# check that object is not being pasted into itself or its children.
target = container
while target is not None:
if target is object:
raise TypeError("Cannot add an object to itself or its children.")
if zope.location.interfaces.ILocation.providedBy(target):
target = target.__parent__
else:
target = None
# check the constraint on __parent__
__parent__ = providedBy(object).get('__parent__')
if __parent__ is not None:
try:
validate = __parent__.validate
except AttributeError:
pass
else:
validate(container)
if not containerProvided.extends(IContainer):
# If it doesn't implement IContainer, it can't contain stuff.
raise TypeError(
_('Container is not a valid Zope container.'))
