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import rdflib
from rdflib.graph import ConjunctiveGraph as Graph
from rdflib import plugin
from rdflib.store import Store, NO_STORE, VALID_STORE
from rdflib.namespace import Namespace
from rdflib.term import Literal
from rdflib.term import URIRef
from tempfile import mkdtemp
from gstudio.models import *
from objectapp.models import *
from django.core.management.base import NoArgsCommand
from django.core.management.base import BaseCommand
def rdf_description(name,notation='xml' ):
"""
Funtion takes title of node, and rdf notation.
"""
valid_formats = ["xml", "n3", "ntriples", "trix"]
default_graph_uri = "http://gstudio.gnowledge.org/rdfstore"
# default_graph_uri = "http://example.com/"
configString = "/var/tmp/rdfstore"
# Get the IOMemory plugin.
store = plugin.get('IOMemory', Store)('rdfstore')
# Open previously created store, or create it if it doesn't exist yet
graph = Graph(store="IOMemory",
identifier = URIRef(default_graph_uri))
path = mkdtemp()
rt = graph.open(path, create=False)
if rt == NO_STORE:
graph.open(path, create=True)
else:
assert rt == VALID_STORE, "The underlying store is corrupt"
# Now we'll add some triples to the graph & commit the changes
#rdflib = Namespace('http://sbox.gnowledge.org/gstudio/')
graph.bind("gstudio", "http://gnowledge.org/")
exclusion_fields = ["id", "rght", "node_ptr_id", "image", "lft", "_state", "_altnames_cache", "_tags_cache", "nid_ptr_id", "_mptt_cached_fields"]
#verifies the type of node
node=NID.objects.get(title=name)
node_type=node.reftype
if (node_type=='Gbobject' ):
node=Gbobject.objects.get(title=name)
rdflib=link(node)
elif (node_type=='None'):
node=Gbobject.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Processes'):
node=Gbobject.objects.get(title=name)
rdflib=link(node)
elif (node_type=='System'):
node=Gbobject.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Objecttype'):
node=Objecttype.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Attributetype'):
node=Attributetype.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Complement'):
node=Complement.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Union'):
node=Union.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Intersection'):
node=Intersection.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Expression'):
node=Expression.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Processtype'):
node=Processtype.objects.get(title=name)
rdflib=link(node)
elif (node_type=='Systemtype'):
node=Systemtype.objects.get(title=name)
rdflib=link(node)
elif (node_type=='AttributeSpecification'):
node=AttributeSpecification.objects.get(title=name)
rdflib=link(node)
elif (node_type=='RelationSpecification'):
node=RelationSpecification.objects.get(title=name)
rdflib=link(node)
elif(node_type=='Attribute'):
node=Attribute.objects.get(title=name)
rdflib = Namespace('http://sbox.gnowledge.org/gstudio/')
elif(node_type=='Relationtype' ):
node=Relationtype.objects.get(title=name)
rdflib = Namespace('http://sbox.gnowledge.org/gstudio/')
elif(node_type=='Metatype'):
node=Metatype.objects.get(title=name)
rdflib = Namespace('http://sbox.gnowledge.org/gstudio/')
else:
rdflib = Namespace('http://sbox.gnowledge.org/gstudio/')
node_dict=node.__dict__
subject=str(node_dict['id'])
for key in node_dict:
if key not in exclusion_fields:
predicate=str(key)
pobject=str(node_dict[predicate])
graph.add((rdflib[subject], rdflib[predicate], Literal(pobject)))
rdf_code=graph.serialize(format=notation)
graph.commit()
print rdf_code
graph.close()
#provides the url address of particular node.
def link(node):
node_url=node.get_absolute_url()
site_addr= node.sites.all()
a=site_addr[0]
host_name=a.name
link='http://'
#Concatenating the above variables will give the url address.
url_addr=link+host_name+node_url
rdflib=Namespace(url_addr)
return rdflib
class Command(BaseCommand):
def handle(self,*args,**options):
# verifies and pass the node rdf_discription() to display the rdf accordingly.
inr=0
object_list=NID.objects.all()
for each in object_list:
rdf_description(object_list[inr],*args)
inr=inr+1
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