def __init__(self, method, *args):
self.method = method
self.args = args
# Check arguments
try:
inspect.getcallargs(self.construct, *args)
except TypeError as e:
raise InvalidFilterSpecError(e)
# Call construct
try:
self.construct(*args)
except ValueError as e:
raise InvalidFilterSpecError(e)
def operations(self):
# Search for operations
self._search_for_operations()
# Build list of operation objects
operations = []
for op_spec in self.spec.split('|'):
op_spec_parts = op_spec.split('-')
if op_spec_parts[0] not in self._registered_operations:
raise InvalidFilterSpecError("Unrecognised operation: %s" % op_spec_parts[0])
op_class = self._registered_operations[op_spec_parts[0]]
operations.append(op_class(*op_spec_parts))
return operations
def operations(self):
# Search for operations
registered_operations = {}
for fn in hooks.get_hooks('register_image_operations'):
registered_operations.update(dict(fn()))
# Build list of operation objects
operations = []
for op_spec in self.spec.split('|'):
op_spec_parts = op_spec.split('-')
if op_spec_parts[0] not in registered_operations:
raise InvalidFilterSpecError("Unrecognised operation: %s" % op_spec_parts[0])
op_class = registered_operations[op_spec_parts[0]]
operations.append(op_class(*op_spec_parts))
return operations
