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"""
Part of the BlackStar filesystem (bsfs) module.
A copy of the license is provided with the project.
Author: Matthias Baumgartner, 2022
"""
# imports
import abc
import typing
# bsfs imports
from bsfs import schema as _schema
from bsfs.triple_store import TripleStoreBase
from bsfs.utils import URI
# exports
__all__: typing.Sequence[str] = (
'AccessControlBase',
)
## code ##
class AccessControlBase(abc.ABC):
"""
"""
#
__backend: TripleStoreBase
#
__user: URI
def __init__(
self,
backend: TripleStoreBase,
user: URI,
):
self.__backend = backend
self.__user = URI(user)
@abc.abstractmethod
def is_protected_predicate(self, pred: _schema.Predicate) -> bool:
"""Return True if a predicate cannot be modified manually."""
@abc.abstractmethod
def create(self, node_type: _schema.Node, guids: typing.Iterable[URI]):
"""Perform post-creation operations on nodes, e.g. ownership information."""
@abc.abstractmethod
def link_from_node(self, node_type: _schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes for which outbound links can be written."""
@abc.abstractmethod
def link_to_node(self, node_type: _schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes for which inbound links can be written."""
@abc.abstractmethod
def write_literal(self, node_type: _schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes to which literals can be attached."""
@abc.abstractmethod
def createable(self, node_type: _schema.Node, guids: typing.Iterable[URI]) -> typing.Iterable[URI]:
"""Return nodes that are allowed to be created."""
## EOF ##
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