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import warnings
from rdflib.serializer import Serializer
from rdflib.py3compat import b
from rdflib.plugins.serializers.nt import _xmlcharref_encode
__all__ = ['NQuadsSerializer']
class NQuadsSerializer(Serializer):
def __init__(self, store):
if not store.context_aware:
raise Exception("NQuads serialization only makes sense for context-aware stores!")
super(NQuadsSerializer, self).__init__(store)
def serialize(self, stream, base=None, encoding=None, **args):
if base is not None:
warnings.warn("NQuadsSerializer does not support base.")
if encoding is not None:
warnings.warn("NQuadsSerializer does not use custom encoding.")
encoding = self.encoding
for context in self.store.contexts():
for triple in context:
stream.write(_nq_row(triple, context.identifier).encode(encoding, "replace"))
stream.write(b("\n"))
def _nq_row(triple,context):
return u"%s %s %s %s .\n" % (triple[0].n3(),
triple[1].n3(),
_xmlcharref_encode(triple[2].n3()),
context.n3())
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