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"""Extract information from the file system, such as filesize.
Part of the bsie module.
A copy of the license is provided with the project.
Author: Matthias Baumgartner, 2022
"""
# imports
import typing
# inner-module imports
from bsie.base import extractor
from bsie.utils import node, ns
from bsie.utils.bsfs import URI
import bsie.reader.stat
# exports
__all__: typing.Sequence[str] = (
'Stat',
)
## code ##
class Stat(extractor.Extractor):
"""Extract information from the file system."""
CONTENT_READER = bsie.reader.stat.Stat
def __init__(self):
self.__callmap = {
ns.bse.filesize: self.__filesize,
}
def schema(self) -> str:
return '''
bse:filesize a bsfs:Predicate ;
rdfs:domain bsfs:Entity ;
rdfs:range xsd:integer ;
rdf:label "File size"^^xsd:string ;
schema:description "File size of entity in some filesystem."^^xsd:string ;
owl:maxCardinality "INF"^^xsd:number .
'''
def extract(
self,
subject: node.Node,
content: CONTENT_READER.CONTENT_TYPE,
predicates: typing.Iterable[URI],
) -> typing.Iterator[typing.Tuple[node.Node, URI, typing.Any]]:
for pred in predicates:
# 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 __filesize(self, content: CONTENT_READER.CONTENT_TYPE) -> int:
"""Return the file size."""
try:
return content.st_size
except Exception:
# FIXME: some kind of error reporting (e.g. logging)
return None
## EOF ##
|
