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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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View Code Duplication |
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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def __init__(self, vocab_id, datadir, language): |
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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.language = language |
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self._skos_vocab = None |
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@staticmethod |
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def _index_filename(language): |
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return f"subjects.{language}.tsv" |
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def _create_subject_index(self, subject_corpus, language): |
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subjects = annif.corpus.SubjectIndex() |
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subjects.load_subjects(subject_corpus, language) |
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annif.util.atomic_save(subjects, self.datadir, |
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self._index_filename(language)) |
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return subjects |
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def _update_subject_index(self, subject_corpus, language): |
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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, language) |
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updated_subjects = annif.corpus.SubjectIndex() |
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for uri, label, notation in old_subjects: |
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if new_subjects.contains_uri(uri): |
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label, notation = new_subjects[new_subjects.by_uri(uri)][1:3] |
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else: # subject removed from new corpus |
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label, notation = None, None |
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updated_subjects.append(uri, label, notation) |
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for uri, label, notation in new_subjects: |
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if not old_subjects.contains_uri(uri): |
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updated_subjects.append(uri, label, notation) |
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annif.util.atomic_save(updated_subjects, self.datadir, |
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self._index_filename(language)) |
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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, |
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self._index_filename(self.language)) |
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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( |
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"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, 'subjects.dump.gz') |
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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, 'subjects.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, self.language) |
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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 load_vocabulary(self, subject_corpus, project_language, 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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languages = subject_corpus.languages |
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if languages is None: |
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# subject corpus isn't language-aware, default to project language |
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languages = [project_language] |
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for language in languages: |
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if not force and os.path.exists( |
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os.path.join(self.datadir, |
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self._index_filename(language))): |
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logger.info('updating existing vocabulary') |
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subjects = self._update_subject_index(subject_corpus, language) |
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else: |
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subjects = self._create_subject_index(subject_corpus, language) |
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if language == project_language: |
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self._subjects = subjects |
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subject_corpus.save_skos(os.path.join(self.datadir, 'subjects.ttl'), |
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project_language) |
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def as_skos_file(self): |
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"""return the vocabulary as a file object, in SKOS/Turtle syntax""" |
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return open(os.path.join(self.datadir, 'subjects.ttl'), 'rb') |
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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
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