forked from severus21/RDFSerializer
/
__init__.py
165 lines (118 loc) · 4.53 KB
/
__init__.py
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import itertools
from django.urls import reverse
from django.db.models import Model
from rdflib.namespace import Namespace, RDF
from rdflib import URIRef, Literal, BNode, Graph
SCHEMA = Namespace('http://schema.org/')
class RDFSimpleField:
def __init__(self, relation, attr_str):
self.attr_str = attr_str
self.relation = relation
def serialize(self, model_node, model):
attr = getattr(model, self.attr_str)
if attr:
yield (model_node, self.relation, Literal(attr))
else:
return []
raise Exception("{} not valid on model {}".format(self.attr_str,
model.id))
class RDFManyField(RDFSimpleField):
def __init__(self, relation, attr_str, converter):
self.attr_str = attr_str
self.relation = relation
self.converter = converter
def serialize(self, model_node, model):
objects = getattr(model, self.attr_str).all()
for _obj in objects:
yield (model_node, self.relation, Literal(self.converter(_obj)))
class RDFBinder(RDFSimpleField):
def __init__(self, relation, attr_str, attr_serializer):
self.attr_str = attr_str
self.relation = relation
self.attr_serializer = attr_serializer
def bind(self, model_node, related_node):
raise NotImplementedError("Should have implemented this")
def serialize(self, model_node, model):
tmp = getattr(model, self.attr_str)
if not tmp:
return
related_serializer = self.attr_serializer()
if not isinstance(tmp, Model):
related_models = tmp.all()
else:
related_models = [tmp]
for related_model in related_models:
for tmp in related_serializer._triples(related_model):
yield tmp
yield self.bind(model_node, related_serializer.node(related_model))
class RDFLeftBinder(RDFBinder):
def __init__(self, relation, attr_str, attr_serializer):
RDFBinder.__init__(self, relation, attr_str, attr_serializer)
def bind(self, model_node, related_node):
return (model_node, self.relation, related_node)
class RDFRightBinder(RDFBinder):
def __init__(self, relation, attr_str, attr_serializer):
RDFBinder.__init__(self, relation, attr_str, attr_serializer)
def bind(self, model_node, related_node):
return (related_node, self.relation, model_node)
class RDFManyLinker(RDFBinder):
""" Link together many to many children """
def __init__(self, relation, attr_str, attr_serializer):
self.attr_str = attr_str
self.relation = relation
self.attr_serializer = attr_serializer
def serialize(self, _, model):
tmps = getattr(model, self.attr_str)
if not tmps:
return
related_serializer = self.attr_serializer()
for _tmp1 in tmps.all():
for _tmp2 in tmps.all():
if _tmp1 != _tmp2:
n1 = related_serializer.node(_tmp1)
n2 = related_serializer.node(_tmp2)
yield (n1, self.relation, n2)
yield (n2, self.relation, n1)
class RDFSerialiser:
pass
class RDFModelSerialiser(RDFSerialiser):
_type = None
model = None
uri = None
def __init__(self, graph=None):
self.graph = graph if graph else Graph()
self.work_done = False
def node(self, model):
if self.uri:
return URIRef(reverse(self.uri, args=[model.id]))
return BNode()
def _triples(self, model):
pub_node = self.node(model)
yield (pub_node, RDF.type, self._type)
for field in self.entries:
for triple in field.serialize(pub_node, model):
yield triple
def triples(self):
if self.work_done:
return
for model in self.model.objects.all():
for triple in self._triples(model):
self.graph.add(triple)
def serialize(self, format='xml', models=None):
if models is None:
self.triples()
else:
for model in models:
for triple in self._triples(model):
self.graph.add(triple)
return self.graph.serialize(format=format).decode()
class RDFModelExpander(RDFModelSerialiser):
def __init__(self, graph=None):
super().__init__(graph)
def _triples(self, models):
return
yield
def triples(self):
return
def serialize(self):
return ""