+ def __new__ (cls, url, **kw):
+ """ Return the correct sub-class depending on url,
+ pass parsed url parameters to object
+ """
+ if cls != Store:
+ return super(Store, cls).__new__(cls, url, **kw)
+ (scheme, netloc, path, params, query, fragment) \
+ = urllib.parse.urlparse(url)
+
+ try:
+ cumulus = __import__('cumulus.store.%s' % scheme, globals())
+ subcls = getattr (cumulus.store, scheme).Store
+ obj = super(Store, cls).__new__(subcls, url, **kw)
+ obj.scheme = scheme
+ obj.netloc = netloc
+ obj.path = path
+ obj.params = params
+ obj.query = query
+ obj.fragment = fragment
+ return obj
+ except ImportError:
+ raise NotImplementedError("Scheme %s not implemented" % scheme)
+
+ def list(self, path):
+ raise NotImplementedError
+
+ def get(self, path):
+ raise NotImplementedError
+
+ def put(self, path, fp):
+ raise NotImplementedError
+
+ def delete(self, path):
+ raise NotImplementedError
+
+ def stat(self, path):
+ raise NotImplementedError
+
+ def scan(self, path):
+ """Cache file information stored in this backend.
+
+ This might make subsequent list or stat calls more efficient, but this
+ function is intended purely as a performance optimization."""
+
+ pass
+
+ def close(self):
+ """Tear down the connection explicitly if needed