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from rdflib.serializer import Serializer
from rdflib.plugins.serializers.xmlwriter import XMLWriter
from rdflib.term import URIRef, Literal, BNode
from rdflib.namespace import Namespace
from rdflib.graph import Graph, ConjunctiveGraph
from six import text_type, b
__all__ = ['TriXSerializer']
# TODO: Move this somewhere central
TRIXNS = Namespace("http://www.w3.org/2004/03/trix/trix-1/")
XMLNS = Namespace("http://www.w3.org/XML/1998/namespace")
class TriXSerializer(Serializer):
def __init__(self, store):
super(TriXSerializer, self).__init__(store)
if not store.context_aware:
raise Exception(
"TriX serialization only makes sense for context-aware stores")
def serialize(self, stream, base=None, encoding=None, **args):
nm = self.store.namespace_manager
self.writer = XMLWriter(stream, nm, encoding, extra_ns={"": TRIXNS})
self.writer.push(TRIXNS[u"TriX"])
self.writer.namespaces()
if isinstance(self.store, ConjunctiveGraph):
for subgraph in self.store.contexts():
self._writeGraph(subgraph)
elif isinstance(self.store, Graph):
self._writeGraph(self.store)
else:
raise Exception("Unknown graph type: " + type(self.store))
self.writer.pop()
stream.write(b("\n"))
def _writeGraph(self, graph):
self.writer.push(TRIXNS[u"graph"])
if isinstance(graph.identifier, URIRef):
self.writer.element(
TRIXNS[u"uri"], content=text_type(graph.identifier))
for triple in graph.triples((None, None, None)):
self._writeTriple(triple)
self.writer.pop()
def _writeTriple(self, triple):
self.writer.push(TRIXNS[u"triple"])
for component in triple:
if isinstance(component, URIRef):
self.writer.element(TRIXNS[u"uri"],
content=text_type(component))
elif isinstance(component, BNode):
self.writer.element(TRIXNS[u"id"],
content=text_type(component))
elif isinstance(component, Literal):
if component.datatype:
self.writer.element(TRIXNS[u"typedLiteral"],
content=text_type(component),
attributes={TRIXNS[u"datatype"]:
text_type(component.datatype)})
elif component.language:
self.writer.element(TRIXNS[u"plainLiteral"],
content=text_type(component),
attributes={XMLNS[u"lang"]:
text_type(component.language)})
else:
self.writer.element(TRIXNS[u"plainLiteral"],
content=text_type(component))
self.writer.pop()
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