def by_uri(self, uri):
"""return the subject index of a subject by its URI"""
try:
return self._uri_idx[uri]
except KeyError:
logger.warning('Unknown subject URI <%s>', uri)
return None
def by_label(self, label):
"""return the subject index of a subject by its label"""
try:
return self._label_idx[label]
except KeyError:
logger.warning('Unknown subject label "%s"', label)
return None
def by_uri(self, uri, warnings=True):
"""return the subject index of a subject by its URI, or None if not found.
If warnings=True, log a warning message if the URI cannot be found."""
try:
return self._uri_idx[uri]
except KeyError:
if warnings:
logger.warning('Unknown subject URI <%s>', uri)
return None
def warning(self, message):
"""Log a warning message from this backend"""
logger.warning("Backend {}: {}".format(self.backend_id, message))