def testCreateWriterDirectInstantiation(self):
"""
Only FileWriter can be instantiated by CreateWriter.
All others in writers.py must be instantiated via their constructor.
"""
location = os.path.join(TEST_DATA, 'aes')
self.assertTrue(os.path.isdir(location))
# make sure all writers are available
util.ImportBackends()
# Check all non-FileWriters
for sc in writers.Writer.__subclasses__():
if not issubclass(sc, writers.FileWriter):
self.assertIsNone(sc.CreateWriter(location))
def CreateWriter(location):
"""Factory function for Writers
@param location: where (file, uri, etc) the writer should write to
@type location: string
"""
# make sure all writers are available
util.ImportBackends()
for sc in Writer.__subclasses__():
writer = sc.CreateWriter(location)
if writer:
return writer
raise errors.KeyczarError(
"Unable to create a writer for %s. Does the location exist?" % location)
def CreateReader(location):
"""Factory function for Reader's
@param location: where (file, uri, etc) the reader should read from
@type location: string
"""
# make sure all readers are available
util.ImportBackends()
# return the first that accepts the location
for sc in Reader.__subclasses__():
reader = sc.CreateReader(location)
if reader:
return reader
raise errors.KeyczarError(
"Unable to create a reader for %s. Does the location exist?" %
location)