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from rdflib import Graph, Namespace, RDF, Variable
from rdflib.query import Result, ResultParser
RS = Namespace("http://www.w3.org/2001/sw/DataAccess/tests/result-set#")
class RDFResultParser(ResultParser):
def parse(self, source, **kwargs):
return RDFResult(source, **kwargs)
class RDFResult(Result):
def __init__(self, source, **kwargs):
if not isinstance(source, Graph):
graph = Graph()
graph.load(source, **kwargs)
else:
graph = source
rs = graph.value(predicate=RDF.type, object=RS.ResultSet)
# there better be only one :)
if rs is None:
type_ = "CONSTRUCT"
# use a new graph
g = Graph()
g += graph
else:
askAnswer = graph.value(rs, RS.boolean)
if askAnswer is not None:
type_ = "ASK"
else:
type_ = "SELECT"
Result.__init__(self, type_)
if type_ == "SELECT":
self.vars = [Variable(v) for v in graph.objects(rs, RS.resultVariable)]
self.bindings = []
for s in graph.objects(rs, RS.solution):
sol = {}
for b in graph.objects(s, RS.binding):
sol[Variable(graph.value(b, RS.variable))] = graph.value(
b, RS.value
)
self.bindings.append(sol)
elif type_ == "ASK":
self.askAnswer = askAnswer.value
if askAnswer.value is None:
raise Exception("Malformed boolean in ask answer!")
elif type_ == "CONSTRUCT":
self.graph = g
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