def test_simple(self):
""" Try to produce a simple "SELECT ... WHERE ..." query. """
expected = canonical(u"SELECT ?s ?p ?o WHERE { ?s ?p ?o }")
query = select("?s", "?p", "?o").where(("?s", "?p", "?o"))
result = SparqlTranslator(query).translate()
# Translated query should be unicode object.
self.assertTrue(isinstance(result, unicode))
result = canonical(result)
self.assertEqual(expected, result)
def test_ask(self):
""" Try ASK. """
expected = canonical(u"""
ASK FROM <http://uri1>
{
?s ?p ?o
}
""")
query = ask().from_(URIRef("http://uri1")).where(("?s", "?p", "?o"))
result = canonical(SparqlTranslator(query).translate())
self.assertEqual(expected, result)
def test_union(self):
""" Try to produce query containing union. """
expected = canonical(u"""
SELECT ?s
WHERE {
{ ?s ?v1 ?v2} UNION { ?s ?v3 ?v4 }
}
""")
query = select("?s").union(("?s", "?v1", "?v2"), ("?s", "?v3", "?v4"))
result = canonical(SparqlTranslator(query).translate())
self.assertEqual(expected, result)
def test_simple():
"""
Try to produce a simple "SELECT ... WHERE ..." query.
"""
expected = canonical(u"SELECT ?s ?p ?o WHERE { ?s ?p ?o }")
query = select("?s", "?p", "?o").where(("?s", "?p", "?o"))
result = SparqlTranslator(query).translate()
# Translated query should be unicode object.
assert isinstance(result, basestring)
result = canonical(result)
assert expected == result
def test_describe(self):
""" Try to produce DESCRIBE query. """
expected = canonical(u"""
DESCRIBE ?s
FROM <http://uri1>
WHERE {
?s ?p ?o
} LIMIT 10
""")
query = describe("?s").where(("?s", "?p", "?o"))
query.from_("http://uri1").limit(10)
result = canonical(SparqlTranslator(query).translate())
self.assertEqual(expected, result)
def test_from(self):
""" Try to produce query that contains FROM clauses. """
expected = canonical(u"""
SELECT ?s ?p ?o
FROM <http://uri1>
FROM <http://uri2>
WHERE {
?s ?p ?o
}
""")
query = select("?s", "?p", "?o").where(("?s", "?p", "?o"))
query.from_("http://uri1", URIRef("http://uri2"))
result = canonical(SparqlTranslator(query).translate())
self.assertEqual(expected, result)
def test_subquery(self):
""" Try to produce query that contains subquery in WHERE clause. """
expected = canonical(u"""
SELECT ?s ?p ?o
WHERE {
?s ?p ?o.
{ SELECT ?s WHERE { ?s ?a ?b } LIMIT 3 }
}
""")
subquery = select("?s").where(("?s", "?a", "?b")).limit(3)
query = select("?s", "?p", "?o").where(("?s", "?p", "?o"), subquery)
result = canonical(SparqlTranslator(query).translate())
self.assertEqual(expected, result)
def test_from_named():
"""
Try to produce query that contains FROM & FROM NAMED clauses.
"""
expected = canonical(u"""
SELECT ?s ?p ?o
FROM <http://uri1>
FROM NAMED <http://uri1>
FROM NAMED <http://uri2>
WHERE {
?s ?p ?o
}
""")
query = select("?s", "?p", "?o").where(("?s", "?p", "?o"))
query.from_("http://uri1")
query.from_named("http://uri1", URIRef("http://uri2"))
result = canonical(SparqlTranslator(query).translate())
assert expected == result
def _unicode(self):
# Importing here to avoid circular imports.
from surf.query.translator.sparql import SparqlTranslator
return SparqlTranslator(self).translate()