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"""Vocabulary management functionality for Annif""" |
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import os.path |
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import annif |
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import annif.corpus |
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import annif.util |
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from annif.datadir import DatadirMixin |
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from annif.exception import NotInitializedException |
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logger = annif.logger |
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class AnnifVocabulary(DatadirMixin): |
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"""Class representing a subject vocabulary which can be used by multiple |
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Annif projects.""" |
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# defaults for uninitialized instances |
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_subjects = None |
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# constants |
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INDEX_FILENAME_DUMP = "subjects.dump.gz" |
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INDEX_FILENAME_TTL = "subjects.ttl" |
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INDEX_FILENAME_CSV = "subjects.csv" |
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def __init__(self, vocab_id, datadir): |
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DatadirMixin.__init__(self, datadir, "vocabs", vocab_id) |
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self.vocab_id = vocab_id |
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self._skos_vocab = None |
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def _create_subject_index(self, subject_corpus): |
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subjects = annif.corpus.SubjectIndex() |
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subjects.load_subjects(subject_corpus) |
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annif.util.atomic_save(subjects, self.datadir, self.INDEX_FILENAME_CSV) |
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return subjects |
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def _update_subject_index(self, subject_corpus): |
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old_subjects = self.subjects |
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new_subjects = annif.corpus.SubjectIndex() |
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new_subjects.load_subjects(subject_corpus) |
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updated_subjects = annif.corpus.SubjectIndex() |
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for old_subject in old_subjects: |
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if new_subjects.contains_uri(old_subject.uri): |
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new_subject = new_subjects[new_subjects.by_uri(old_subject.uri)] |
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else: # subject removed from new corpus |
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new_subject = annif.corpus.Subject( |
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uri=old_subject.uri, labels=None, notation=None |
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) |
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updated_subjects.append(new_subject) |
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for new_subject in new_subjects: |
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if not old_subjects.contains_uri(new_subject.uri): |
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updated_subjects.append(new_subject) |
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annif.util.atomic_save(updated_subjects, self.datadir, self.INDEX_FILENAME_CSV) |
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return updated_subjects |
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@property |
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def subjects(self): |
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if self._subjects is None: |
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path = os.path.join(self.datadir, self.INDEX_FILENAME_CSV) |
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if os.path.exists(path): |
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logger.debug("loading subjects from %s", path) |
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self._subjects = annif.corpus.SubjectIndex.load(path) |
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else: |
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raise NotInitializedException("subject file {} not found".format(path)) |
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return self._subjects |
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@property |
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def skos(self): |
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"""return the subject vocabulary from SKOS file""" |
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if self._skos_vocab is not None: |
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return self._skos_vocab |
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# attempt to load graph from dump file |
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dumppath = os.path.join(self.datadir, self.INDEX_FILENAME_DUMP) |
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if os.path.exists(dumppath): |
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logger.debug(f"loading graph dump from {dumppath}") |
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try: |
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self._skos_vocab = annif.corpus.SubjectFileSKOS(dumppath) |
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except ModuleNotFoundError: |
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# Probably dump has been saved using a different rdflib version |
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logger.debug("could not load graph dump, using turtle file") |
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else: |
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return self._skos_vocab |
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# graph dump file not found - parse ttl file instead |
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path = os.path.join(self.datadir, self.INDEX_FILENAME_TTL) |
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if os.path.exists(path): |
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logger.debug(f"loading graph from {path}") |
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self._skos_vocab = annif.corpus.SubjectFileSKOS(path) |
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# store the dump file so we can use it next time |
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self._skos_vocab.save_skos(path) |
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return self._skos_vocab |
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raise NotInitializedException(f"graph file {path} not found") |
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def __len__(self): |
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return len(self.subjects) |
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@property |
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def languages(self): |
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return self.subjects.languages |
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def load_vocabulary(self, subject_corpus, force=False): |
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"""Load subjects from a subject corpus and save them into one |
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or more subject index files as well as a SKOS/Turtle file for later |
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use. If force=True, replace the existing subject index completely.""" |
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if not force and os.path.exists( |
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os.path.join(self.datadir, self.INDEX_FILENAME_CSV) |
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): |
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logger.info("updating existing subject index") |
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self._subjects = self._update_subject_index(subject_corpus) |
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else: |
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logger.info("creating subject index") |
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self._subjects = self._create_subject_index(subject_corpus) |
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skosfile = os.path.join(self.datadir, self.INDEX_FILENAME_TTL) |
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logger.info(f"saving vocabulary into SKOS file {skosfile}") |
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subject_corpus.save_skos(skosfile) |
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def as_graph(self): |
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"""return the vocabulary as an rdflib graph""" |
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return self.skos.graph |
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NatLibFi /
Annif
