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import warnings
from typing import IO, Optional
from rdflib.graph import ConjunctiveGraph, Graph
from rdflib.plugins.serializers.nt import _quoteLiteral
from rdflib.serializer import Serializer
from rdflib.term import Literal
__all__ = ["NQuadsSerializer"]
class NQuadsSerializer(Serializer):
def __init__(self, store: Graph):
if not store.context_aware:
raise Exception(
"NQuads serialization only makes " "sense for context-aware stores!"
)
super(NQuadsSerializer, self).__init__(store)
self.store: ConjunctiveGraph
def serialize(
self,
stream: IO[bytes],
base: Optional[str] = None,
encoding: Optional[str] = None,
**args,
):
if base is not None:
warnings.warn("NQuadsSerializer does not support base.")
if encoding is not None and encoding.lower() != self.encoding.lower():
warnings.warn(
"NQuadsSerializer does not use custom encoding. "
f"Given encoding was: {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("\n".encode("latin-1"))
def _nq_row(triple, context):
if isinstance(triple[2], Literal):
return "%s %s %s %s .\n" % (
triple[0].n3(),
triple[1].n3(),
_quoteLiteral(triple[2]),
context.n3(),
)
else:
return "%s %s %s %s .\n" % (
triple[0].n3(),
triple[1].n3(),
triple[2].n3(),
context.n3(),
)
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