def _tr_init(self, set_conf=0, transform=None):
""" initialize the zope transform by loading the wrapped transform """
__traceback_info__ = (self.module, )
if transform is None:
transform = self._load_transform()
else:
self._v_transform = transform
# check this is a valid transform
if not hasattr(transform, '__class__'):
raise TransformException('Invalid transform : transform is not a class')
if not itransform.isImplementedBy(transform):
raise TransformException('Invalid transform : itransform is not implemented by %s' % transform.__class__)
if not hasattr(transform, 'inputs'):
raise TransformException('Invalid transform : missing required "inputs" attribute')
if not hasattr(transform, 'output'):
raise TransformException('Invalid transform : missing required "output" attribute')
# manage configuration
if set_conf and hasattr(transform, 'config'):
conf = dict(transform.config)
self._config.update(conf)
make_config_persistent(self._config)
if hasattr(transform, 'config_metadata'):
conf = dict(transform.config_metadata)
self._config_metadata.update(conf)
make_config_persistent(self._config_metadata)
transform.config = dict(self._config)
make_config_nonpersistent(transform.config)
transform.config_metadata = dict(self._config_metadata)
make_config_nonpersistent(transform.config_metadata)
self.inputs = transform.inputs
self.output = transform.output
self.output_encoding = getattr(transform, 'output_encoding', None)
return transform
def registerTransform(self, transform):
"""register a new transform
transform isn't a Zope Transform (the wrapper) but the wrapped transform
the persistence wrapper will be created here
"""
# needed when call from transform.transforms.initialize which
# register non zope transform
module = str(transform.__module__)
transform = Transform(transform.name(), module, transform)
if not itransform.isImplementedBy(transform):
raise TransformException('%s does not implement itransform' % transform)
name = transform.name()
__traceback_info__ = (name, transform)
if name not in self.objectIds():
self._setObject(name, transform)
self._mapTransform(transform)
