def test_GIVEN_group_with_nx_class_as_str_WHEN_getting_nx_class_THEN_returns_nx_class_as_str(
file, ):
entry = file.create_group("entry")
nx_class = "NXentry"
entry.attrs["NX_class"] = nx_class
assert get_nx_class(entry) == nx_class
def test_GIVEN_group_with_nx_class_as_bytes_WHEN_getting_nx_class_THEN_returns_nx_class_as_str(
):
with InMemoryFile("test_file") as file:
entry = file.create_group("entry")
nx_class = b"NXentry"
entry.attrs["NX_class"] = nx_class
assert get_nx_class(entry) == str(nx_class, encoding="utf-8")
def find_streams(_, node):
nonlocal pv_names
nonlocal stream_list
if (isinstance(node, h5py.Group)
and get_nx_class(node) == CommonAttrs.NC_STREAM
and node["writer_module"][()] in FORWARDER_SCHEMAS):
writer_module = node["writer_module"][()]
pv_name = node["source"][()]
if pv_name not in pv_names.keys():
stream_list.append({
"channel":
pv_name,
"converter":
get_converter(node, writer_module),
"channel_provider_type":
provider_type,
})
pv_names[pv_name] = len(stream_list)
else:
duplicated_stream = stream_list[pv_names[pv_name] - 1]
new_stream_converter = get_converter(node, writer_module)
if isinstance(duplicated_stream["converter"], list):
duplicated_stream["converter"].append(new_stream_converter)
elif isinstance(duplicated_stream["converter"], dict):
duplicated_stream["converter"] = [
duplicated_stream["converter"],
new_stream_converter,
]
def create_transformation(wrapper: nx.NexusWrapper,
node: h5Node) -> Transformation:
"""
Factory for creating different types of transform.
If it is an NXlog group then the magnitude and units fields will be different to a normal transformation dataset.
"""
if get_nx_class(node) == "NXlog":
return NXLogTransformation(wrapper, node)
return Transformation(wrapper, node)
def create_component(nexus_wrapper: NexusWrapper,
component_group: h5py.Group) -> Component:
nx_class = get_nx_class(component_group)
if nx_class == CHOPPER_CLASS_NAME:
return Component(nexus_wrapper, component_group,
ChopperShape(nexus_wrapper, component_group))
if nx_class in PIXEL_COMPONENT_TYPES and "pixel_shape" in component_group:
return Component(nexus_wrapper, component_group,
PixelShape(nexus_wrapper, component_group))
return Component(nexus_wrapper, component_group)
def _check_nx_class(group: h5py.Group, nx_class: str, problems: List):
group_nx_class = get_nx_class(group)
if not group_nx_class:
problems.append(f"Expected {group.name} to have an NX_class attribute")
elif group_nx_class != nx_class:
problems.append(
f"Expected {group.name} to have NX_class attribute of {nx_class} but it was {group.attrs['NX_class']}"
)
def refresh_depends_on(_, node):
"""
Refresh the depends_on attribute of each transformation, which also results in registering dependents
"""
if isinstance(node, h5py.Group):
if get_nx_class(node) == "NXtransformations":
for transformation_name, transformation_node in node.items(
):
transform = create_transformation(
self.nexus, node[transformation_name])
transform.depends_on = transform.depends_on
def get_shape_from_component(
component_group: h5py.Group, nexus_file: nx.NexusWrapper,
shape_group_name: str
) -> Union[OFFGeometry, CylindricalGeometry, NoShapeGeometry]:
if shape_group_name in component_group:
shape_group = component_group[shape_group_name]
nx_class = get_nx_class(shape_group)
if nx_class == CYLINDRICAL_GEOMETRY_NEXUS_NAME:
return CylindricalGeometry(nexus_file, shape_group)
if nx_class == OFF_GEOMETRY_NEXUS_NAME:
return OFFGeometryNexus(nexus_file, shape_group)
# else return a placeholder to indicate the component's position
return NoShapeGeometry()
def find_field_type(item: h5Node) -> Callable:
if (
isinstance(item, h5py.Dataset)
and get_name_of_node(item) not in INVALID_FIELD_NAMES
):
if np.isscalar(item[()]):
return update_existing_scalar_field
else:
return update_existing_array_field
elif isinstance(item, h5py.Group):
if isinstance(item.parent.get(item.name, getlink=True), h5py.SoftLink):
return update_existing_link_field
elif get_nx_class(item) == CommonAttrs.NC_STREAM:
return update_existing_stream_field
logging.debug(
f"Object {get_name_of_node(item)} not handled as field - could be used for other parts of UI instead"
)
def _handle_group(self, root: h5py.Group):
"""
Generate JSON dict for a h5py group.
:param root: h5py group to generate dict from.
:return: generated dict of group and children.
"""
root_dict = {"type": "group", "name": get_name_of_node(root), "children": []}
# Add the entries
if get_nx_class(root) == CommonAttrs.NC_STREAM:
self._handle_stream(root, root_dict)
return root_dict
for entry in root.values():
# Check if there are SoftLinks in the group
if isinstance(root.get(name=entry.name, getlink=True), h5py.SoftLink):
self._handle_link(entry, root, root_dict)
root_dict["children"].append(self._root_to_dict(entry))
return root_dict
def test_GIVEN_group_without_nx_class_WHEN_getting_nx_class_THEN_returns_none(
):
with InMemoryFile("test_file") as file:
entry = file.create_group("entry")
assert get_nx_class(entry) is None
def nx_class(self):
return get_nx_class(self.group)
def find_components(_, node):
if isinstance(node, h5py.Group):
if CommonAttrs.NX_CLASS in node.attrs.keys():
nx_class = get_nx_class(node)
if nx_class and nx_class in self.nx_component_classes:
component_list.append(create_component(self.nexus, node))
def test_GIVEN_group_without_nx_class_WHEN_getting_nx_class_THEN_returns_none(
file):
entry = file.create_group("entry")
assert get_nx_class(entry) is None
def find_components(_, node):
if isinstance(node, h5py.Group):
if get_nx_class(node) in self.nx_component_classes:
component_list.append(create_component(self.nexus, node))
