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rdflib_user.py
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rdflib_user.py
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#! /usr/bin/python
"""
The only way I can find of using rdflib's parser, and our store.
It seems the RDFlib people agree --- just use the store's own types,
With a usual dispatch to convert them.
$ID $
"""
try:
from rdflib.syntax.parser import ParserDispatcher
except ImportError:
from rdflib.syntax.parsers.RDFXMLParser import RDFXMLParser
class ParserDispatcher(object):
def __init__(self, sink):
self.sink = sink
self.realParser = RDFXMLParser()
def __call__(self, source, format):
self.realParser.parse(source, self.sink)
from rdflib.StringInputSource import StringInputSource
from rdflib.URIRef import URIRef
from rdflib.BNode import BNode
from rdflib.Literal import Literal
from RDFSink import FORMULA, ANONYMOUS, SYMBOL
import diag
from diag import progress
class rdflib_handoff:
"""There is a better way of doing this"""
def __init__(self, store, openFormula, thisDoc, flags="", why=None):
self.parser = ParserDispatcher(self)
self.store = store
self.format = 'xml'
self.formula = openFormula
self.asIfFrom = thisDoc
self.ns_prefix_map = {}
self.prefix_ns_map = {}
self.anonymousNodes = {}
self._reason = why # Why the parser w
self._reason2 = None # Why these triples
if diag.tracking: self._reason2 = BecauseOfData(sink.newSymbol(thisDoc), because=self._reason)
def prefix_mapping(self, prefix, uri, override=False):
self.prefix_ns_map[prefix] = uri
self.ns_prefix_map[uri] = prefix
# print 'why was I told about: ', prefix, uri
# raise RuntimeError(prefix, prefix.__class__, uri, uri.__class__)
bind = prefix_mapping
def feed(self, buffer):
self.parser(StringInputSource(buffer), self.format)
def add(self, (subject, predicate, object)):
# print subject, ", a ", type(subject)
# print '---- has the property of ', predicate, ', of type ', type(predicate)
# print '---- with the value of ', object, ', of type ', type(object), '.'
self.store.makeStatement((self.formula,
self.convertRDFlibTypes(predicate),
self.convertRDFlibTypes(subject),
self.convertRDFlibTypes(object)), self._reason2)
return self
def close(self):
for prefix, uri in self.prefix_ns_map.items():
if prefix == None: prefix = ""
if ':' not in uri:
uri = self.asIfFrom + uri
# print '=+++++++++++++=', uri, "is a ", prefix
self.store.bind(prefix,uri)
return self.formula
def convertRDFlibTypes(self, s):
lang = None
dt = None
if isinstance(s, Literal):
what = s
if s.language != '':
lang = s.language
if s.datatype != '' and s.datatype != None:
dt = self.store.newSymbol(s.datatype)
elif isinstance(s,BNode):
try:
what = self.anonymousNodes[s]
except KeyError:
self.anonymousNodes[s] = self.store.newBlankNode(self.formula,uri=s)
what = self.anonymousNodes[s]
elif ':' in s:
what = (SYMBOL, s)
else: #if s[0] == '#':
what = (SYMBOL, self.asIfFrom + s)
# else:
# what = s
return self.store.intern(what,dt=dt, lang=lang)