Viewing file:  QNameProvider.py (1.46 KB) -rw-r--r--
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from rdflib.syntax.xml_names import split_uri
XMLLANG = u"http://www.w3.org/XML/1998/namespace#lang"
class QNameProvider(object):
def __init__(self):
self.__cache = {}
self.__namespace = {} # mapping for prefix to namespace
self.__prefix = {}
self.set_prefix("xml", u"http://www.w3.org/XML/1998/namespace")
# TODO: explain -- the following is needed for XMLLANG as defined above to work
self.__prefix[u"http://www.w3.org/XML/1998/namespace#"] = "xml"
def get(self, uri):
qname = self.__cache.get(uri, None)
if qname is None:
self.compute(uri)
return self.get(uri)
else:
return qname
def compute(self, uri):
if not uri in self.__cache:
namespace, name = split_uri(uri)
prefix = self.__prefix.get(namespace, None)
if prefix is None:
prefix = "_%s" % len(self.__namespace)
self.set_prefix(prefix, namespace)
if prefix=="":
self.__cache[uri] = name
else:
self.__cache[uri] = ":".join((prefix, name))
def set_prefix(self, prefix, namespace):
if prefix in self.__namespace:
raise "NYI: prefix already set"
self.__namespace[prefix] = namespace
self.__prefix[namespace] = prefix
def namespaces(self):
for prefix, namespace in self.__namespace.iteritems():
yield prefix, namespace
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