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"""Support for subjects loaded from a SKOS/RDF file""" |
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import shutil |
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import rdflib |
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import rdflib.util |
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from rdflib.namespace import SKOS, RDF, OWL |
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from .types import Subject, SubjectCorpus |
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def serialize_subjects_to_skos(subjects, language, path): |
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"""Create a SKOS representation of the given subjects and serialize it |
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into a SKOS/Turtle file with the given path name.""" |
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graph = rdflib.Graph() |
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graph.namespace_manager.bind('skos', SKOS) |
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for subject in subjects: |
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graph.add((rdflib.URIRef(subject.uri), RDF.type, SKOS.Concept)) |
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graph.add((rdflib.URIRef(subject.uri), |
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SKOS.prefLabel, |
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rdflib.Literal(subject.label, language))) |
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graph.serialize(destination=path, format='turtle') |
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class SubjectFileSKOS(SubjectCorpus): |
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"""A subject corpus that uses SKOS files""" |
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def __init__(self, path, language): |
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self.path = path |
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self.language = language |
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self.graph = rdflib.Graph() |
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self.graph.load(self.path, format=rdflib.util.guess_format(self.path)) |
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@property |
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def subjects(self): |
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for concept in self.graph.subjects(RDF.type, SKOS.Concept): |
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if (concept, OWL.deprecated, rdflib.Literal(True)) in self.graph: |
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continue |
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labels = self.graph.preferredLabel(concept, lang=self.language) |
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if not labels: |
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continue |
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label = str(labels[0][1]) |
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yield Subject(uri=str(concept), label=label, text=None) |
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@staticmethod |
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def is_rdf_file(path): |
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"""return True if the path looks like an RDF file that can be loaded |
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as SKOS""" |
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fmt = rdflib.util.guess_format(path) |
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return fmt is not None |
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def save_skos(self, path, language): |
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"""Save the contents of the subject vocabulary into a SKOS/Turtle |
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file with the given path name.""" |
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if self.path.endswith('.ttl'): |
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# input is already in Turtle syntax, no need to reserialize |
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shutil.copyfile(self.path, path) |
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else: |
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# need to serialize into Turtle |
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self.graph.serialize(destination=path, format='turtle') |
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NatLibFi /
Annif
