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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.graph import Graph
from bsfs.triple_store import TripleStoreBase, SparqlStore
from bsfs.utils import URI, errors
# exports
__all__: typing.Sequence[str] = (
'build_graph',
)
# constants
_graph_classes = {
'Graph': Graph,
}
_backend_classes = {
'SparqlStore': SparqlStore,
}
## code ##
def build_backend(cfg: typing.Any) -> TripleStoreBase:
"""Build and return a backend from user-provided config."""
# essential checks
if not isinstance(cfg, dict):
raise TypeError(cfg)
if len(cfg) != 1:
raise errors.ConfigError(f'expected a single key that identifies the backend class, found {list(cfg)}')
# unpack from config
name = next(iter(cfg))
args = cfg[name]
# check name
if name not in _backend_classes:
raise errors.ConfigError(f'{name} is not a valid triple store class name')
# build and return backend
cls = _backend_classes[name]
return cls.Open(**args)
def build_graph(cfg: typing.Any) -> Graph:
"""Build and return a Graph from user-provided config."""
# essential checks
if not isinstance(cfg, dict):
raise TypeError(cfg)
if len(cfg) != 1:
raise errors.ConfigError(f'expected a single key that identifies the graph class, found {list(cfg)}')
# unpack from config
name = next(iter(cfg))
args = cfg[name]
# check name
if name not in _graph_classes:
raise errors.ConfigError(f'{name} is not a valid graph class name')
# check user argument
if 'user' not in args:
raise errors.ConfigError('required argument "user" is not provided')
user = URI(args['user'])
# check backend argument
if 'backend' not in args:
raise errors.ConfigError('required argument "backend" is not provided')
backend = build_backend(args['backend'])
# build and return graph
cls = _graph_classes[name]
return cls(backend, user)
## EOF ##
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