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"""Vocabulary management functionality for Annif""" |
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import os.path |
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import rdflib.graph |
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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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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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def _create_subject_index(self, subject_corpus): |
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self._subjects = annif.corpus.SubjectIndex(subject_corpus) |
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annif.util.atomic_save(self._subjects, self.datadir, '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(subject_corpus) |
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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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self._subjects = updated_subjects |
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annif.util.atomic_save(self._subjects, self.datadir, '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, 'subjects') |
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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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def load_vocabulary(self, subject_corpus, language): |
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"""load subjects from a subject corpus and save them into a |
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SKOS/Turtle file for later use""" |
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if os.path.exists(os.path.join(self.datadir, 'subjects')): |
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logger.info('updating existing vocabulary') |
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self._update_subject_index(subject_corpus) |
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else: |
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self._create_subject_index(subject_corpus) |
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subject_corpus.save_skos(os.path.join(self.datadir, 'subjects.ttl'), |
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language) |
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def as_skos(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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g = rdflib.graph.Graph() |
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g.load( |
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os.path.join(self.datadir, 'subjects.ttl'), |
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format='ttl' |
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) |
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return g |
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NatLibFi /
Annif
