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"""
Part of the bsie module.
A copy of the license is provided with the project.
Author: Matthias Baumgartner, 2022
"""
# imports
import os
import typing
# bsie imports
from bsie.base import extractor
from bsie.utils import bsfs, node, ns
# exports
__all__: typing.Sequence[str] = (
'Path',
)
## code ##
class Path(extractor.Extractor):
"""Extract information from file's path."""
CONTENT_READER = 'bsie.reader.path.Path'
# mapping from predicate to handler function.
_callmap: typing.Dict[bsfs.schema.Predicate, typing.Callable[[str], typing.Any]]
def __init__(self):
super().__init__(bsfs.schema.Schema.from_string(extractor.SCHEMA_PREAMBLE + '''
bse:filename rdfs:subClassOf bsfs:Predicate ;
rdfs:domain bsfs:File ;
rdfs:range xsd:string ;
rdfs:label "File name"^^xsd:string ;
schema:description "Filename of entity in some filesystem."^^xsd:string ;
bsfs:unique "false"^^xsd:boolean .
'''))
self._callmap = {
self.schema.predicate(ns.bse.filename): self.__filename,
}
def extract(
self,
subject: node.Node,
content: str,
principals: typing.Iterable[bsfs.schema.Predicate],
) -> typing.Iterator[typing.Tuple[node.Node, bsfs.schema.Predicate, typing.Any]]:
for pred in principals:
# find callback
clbk = self._callmap.get(pred)
if clbk is None:
continue
# get value
value = clbk(content)
if value is None:
continue
# produce triple
yield subject, pred, value
def __filename(self, path: str) -> typing.Optional[str]:
try:
return os.path.basename(path)
except Exception: # pylint: disable=broad-except # we explicitly want to catch everything
# some error, skip
# FIXME: some kind of error reporting (e.g. logging)?
# Options: (a) Fail silently (current); (b) Skip and report to log;
# (c) Raise ExtractorError (aborts extraction); (d) separate content type
# checks from basename errors (report content type errors, skip basename
# errors)
return None
## EOF ##
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