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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 typing
# bsfs imports
from bsfs.schema import Schema
from bsfs.triple_store import TripleStoreBase
from bsfs.utils import URI, typename
# inner-module imports
from . import nodes
# exports
__all__: typing.Sequence[str] = (
'Graph',
)
## code ##
class Graph():
"""
"""
# link to the triple storage backend.
__backend: TripleStoreBase
# user uri.
__user: URI
def __init__(self, backend: TripleStoreBase, user: URI):
self.__backend = backend
self.__user = user
def __hash__(self) -> int:
return hash((type(self), self.__backend, self.__user))
def __eq__(self, other) -> bool:
return isinstance(other, type(self)) \
and self.__backend == other.__backend \
and self.__user == other.__user
def __repr__(self) -> str:
return f'{typename(self)}(backend={repr(self.__backend)}, user={self.__user})'
def __str__(self) -> str:
return f'{typename(self)}({str(self.__backend)}, {self.__user})'
@property
def schema(self) -> Schema:
"""Return the store's local schema."""
return self.__backend.schema
def nodes(self, node_type: URI, guids: typing.Iterable[URI]) -> nodes.Nodes:
"""
"""
node_type = self.schema.node(node_type)
# NOTE: Nodes constructor materializes guids.
return nodes.Nodes(self.__backend, self.__user, node_type, guids)
## EOF ##
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