def __init__(self, *args, **kwargs):
super(ReferenceService, self).__init__(*args, **kwargs)
self.catalog = RelationCatalog()
self.references = RelationsContainer()
class ReferenceService(SilvaService):
"""This service track existing references between content
"""
meta_type = 'Silva Reference Service'
grok.name('service_reference')
grok.implements(IReferenceService, ISilvaConfigurableService)
silvaconf.default_service(setup=configure_service)
silvaconf.icon('service.png')
manage_options = (
{'label':'Broken references', 'action':'manage_brokenreferences'},
) + SilvaService.manage_options
def __init__(self, *args, **kwargs):
super(ReferenceService, self).__init__(*args, **kwargs)
self.catalog = RelationCatalog()
self.references = RelationsContainer()
def __create_reference(self, content_id, name=None, target_id=0,
tags=None, factory=ReferenceValue):
"""Create and add a new reference
"""
if not IReferenceValue.implementedBy(factory):
raise TypeError('Wrong factory %s for reference, '
'it should implement IReferenceValue' % factory)
if tags is None:
tags = []
if name is not None:
tags.append(name)
reference = factory(content_id, target_id, tags=tags)
reference_id = str(uuid.uuid4())
self.references[reference_id] = reference
return reference
def new_reference(self, content, name=None, factory=ReferenceValue):
"""Create a new reference.
"""
content_id = get_content_id(content)
return self.__create_reference(content_id, name=name, factory=factory)
def get_reference(
self, content, name=None, add=False, factory=ReferenceValue):
"""Retrieve an existing reference.
"""
content_id = get_content_id(content)
references = list(self.catalog.findRelations(
{'source_id': content_id, 'tag': name}))
if not len(references):
if add is True:
return self.__create_reference(
content_id, name=name, factory=factory)
return None
return references[0]
def get_references_to(self, content, name=None, depth=1):
"""Get all references to the given content.
"""
content_id = get_content_id(content)
query = {'target_id': content_id}
options = {}
if name is not None:
query['tag'] = name
if depth:
options['queryFactory'] = TransposingTransitive(
'source_id', 'target_id')
options['maxDepth'] = depth
return self.catalog.findRelations(query, **options)
def get_references_from(self, content, name=None, depth=0):
"""Get all references from the given content.
"""
content_id = get_content_id(content)
query = {'source_id': content_id}
options = {}
if name is not None:
query['tag'] = name
if depth:
options['queryFactory'] = TransposingTransitive(
'souce_id', 'target_id')
options['maxDepth'] = depth
return self.catalog.findRelations(query, **options)
def get_references_between(self, source, target, name=None):
query = {'source_id': get_content_id(source),
'target_id': get_content_id(target)}
if name is not None:
query['tag'] = name
return self.catalog.findRelations(query)
def delete_reference(self, content, name=None):
"""Lookup and remove a reference.
"""
reference = self.get_reference(content, name=name, add=False)
if reference is not None:
del self.references[reference.__name__]
def delete_references(self, content, name=None):
"""Lookup and remove a list of references.
"""
for reference in list(self.get_references_from(content, name=name)):
del self.references[reference.__name__]
def delete_reference_by_name(self, name):
del self.references[name]
def clone_references(
self, content, clone, copy_source=None, copy_target=None):
"""Clone content reference to clone content unless source and
target are both in container.
"""
content_id = get_content_id(content)
clone_id = get_content_id(clone)
references = self.catalog.findRelations({'source_id': content_id})
for reference in references:
clone_target_id = reference.target_id
if copy_source is not None and clone_target_id:
target_path = reference.target.getPhysicalPath()
copy_source_path = copy_source.getPhysicalPath()
if (len(target_path) >= len(copy_source_path) and
target_path[:len(copy_source_path)] == copy_source_path):
# Reference target is in copy_source, so we need to
# set target to the corresponding one in
# copy_target.
assert copy_target is not None
relative_target_path = relative_path(
copy_source_path, target_path)
if relative_target_path != ['.']:
clone_target = copy_target.unrestrictedTraverse(
relative_target_path)
else:
clone_target = copy_target
clone_target_id = get_content_id(clone_target)
self.__create_reference(
clone_id,
target_id=clone_target_id,
tags=list(reference.tags),
factory=reference.__class__)
