1 """Helper features for working with librdf
8 # standard ontology namespaces
9 owlNS = RDF.NS('http://www.w3.org/2002/07/owl#')
10 dublinCoreNS = RDF.NS("http://purl.org/dc/elements/1.1/")
11 rdfNS = RDF.NS("http://www.w3.org/1999/02/22-rdf-syntax-ns#")
12 rdfsNS= RDF.NS("http://www.w3.org/2000/01/rdf-schema#")
13 xsdNS = RDF.NS("http://www.w3.org/2001/XMLSchema#")
16 submissionOntology = RDF.NS("http://jumpgate.caltech.edu/wiki/UcscSubmissionOntology#")
17 dafTermOntology = RDF.NS("http://jumpgate.caltech.edu/wiki/UcscDaf#")
18 libraryOntology = RDF.NS("http://jumpgate.caltech.edu/wiki/LibraryOntology#")
19 submissionLog = RDF.NS("http://jumpgate.caltech.edu/wiki/SubmissionsLog/")
21 def sparql_query(model, query_filename):
22 """Execute sparql query from file
24 query_body = open(query_filename,'r').read()
25 query = RDF.SPARQLQuery(query_body)
26 results = query.execute(model)
29 for k,v in row.items()[::-1]:
30 print "{0}: {1}".format(k,v)
34 def blankOrUri(value=None):
38 elif type(value) in types.StringTypes:
39 node = RDF.Node(uri_string=value)
40 elif isinstance(value, RDF.Node):
46 def toTypedNode(value):
47 if type(value) == types.BooleanType:
48 value_type = xsdNS['boolean'].uri
53 elif type(value) in (types.IntType, types.LongType):
54 value_type = xsdNS['decimal'].uri
55 value = unicode(value)
56 elif type(value) == types.FloatType:
57 value_type = xsdNS['float'].uri
58 value = unicode(value)
59 elif type(value) in types.StringTypes:
60 value_type = xsdNS['string'].uri
63 value = unicode(value)
65 return RDF.Node(literal=value, datatype=value_type)
67 def fromTypedNode(node):
71 value_type = str(node.literal_value['datatype'])
72 # chop off xml schema declaration
73 value_type = value_type.replace(str(xsdNS[''].uri),'')
74 literal = node.literal_value['string']
75 literal_lower = literal.lower()
77 if value_type == 'boolean':
78 if literal_lower in ('1', 'yes', 'true'):
80 elif literal_lower in ('0', 'no', 'false'):
83 raise ValueError("Unrecognized boolean %s" % (literal,))
84 elif value_type == 'decimal' and literal.find('.') == -1:
86 elif value_type in ('decimal', 'float', 'double'):
88 elif value_type in ('string'):
90 elif value_type in ('dateTime'):
91 raise NotImplemented('need to parse isoformat date-time')
96 def get_model(model_name=None, directory=None):
98 directory = os.getcwd()
100 if model_name is None:
101 storage = RDF.MemoryStorage()
103 storage = RDF.HashStorage(model_name,
104 options="hash-type='bdb',dir='{0}'".format(directory))
105 model = RDF.Model(storage)
109 def load_into_model(model, parser_name, filename, ns=None):
110 if not os.path.exists(filename):
111 raise IOError("Can't find {0}".format(filename))
113 data = open(filename, 'r').read()
114 rdf_parser = RDF.Parser(name=parser_name)
115 rdf_parser.parse_string_into_model(model, data, ns)
118 def get_serializer(name='turtle'):
119 """Return a serializer with our standard prefixes loaded
121 writer = RDF.Serializer(name=name)
122 # really standard stuff
123 writer.set_namespace('owl', owlNS._prefix)
124 writer.set_namespace('rdf', rdfNS._prefix)
125 writer.set_namespace('rdfs', rdfsNS._prefix)
126 writer.set_namespace('xsd', xsdNS._prefix)
128 # should these be here, kind of specific to an application
129 writer.set_namespace('libraryOntology', libraryOntology._prefix)
130 writer.set_namespace('ucscSubmission', submissionOntology._prefix)
131 writer.set_namespace('ucscDaf', dafTermOntology._prefix)