Source Code for Module pypln.stores.ontology

 1  #-*- coding:utf-8 -*- 
 2   
 3  """Store and load ontologies from MongoDB""" 
 4   
 5  __docformat__ = 'restructuredtext en' 
 6   
 7  import pymongo 
 8  import rdflib 
 9  import rdfextras 
10   
11   
12  rdfextras.registerplugins() 
13   
14 -class Ontology(object): 
15      """Store and load ontologies from MongoDB""" 
16   
17 -    def __init__(self, name, db, collection, host='127.0.0.1', port=27017): 
18          self.name = name 
19          self.graph = None 
20          self.connection = pymongo.Connection(host=host, port=port) 
21          self.collection = self.connection[db][collection] 
22   
23 -    def import_rdfxml(self, uri): 
24          """ Read RDF/XML from ``uri`` """ 
25          self.graph = rdflib.Graph() 
26          self.graph.parse(uri, format='application/rdf+xml') 
27   
28 -    def store(self): 
29          """ Store ontology in MongoDB (currently in n3 format) """ 
30          data = self._serialize_to_n3() 
31          self.collection.insert({'name': self.name, 'n3': data}) 
32   
33 -    def load(self, name): 
34          """ Load ontology from database and set self.graph to it """ 
35          data = self.collection.find_one({'name': name}) 
36          self.graph = rdflib.Graph() 
37          self.graph.parse(data, format='n3') 
38   
39 -    def _serialize_to_n3(self): 
40          """ Return graph serialized to JSON """ 
41          if self.graph: 
42              return self.graph.serialize(format='n3') 
43          else: 
44              return None 
45