def _message(reader, elem):
"""Start of a Message."""
# <mes:Structure> within <mes:Header> of a data message is handled by
# _header_structure() below.
if getattr(elem.getparent(), "tag", None) == qname("mes", "Header"):
return
ss_without_dsd = False
# With 'dsd' argument, the message should be structure-specific
if (
"StructureSpecific" in elem.tag
and reader.get_single(model.DataStructureDefinition) is None
):
log.warning(f"sdmxml.Reader got no dsd=… argument for {QName(elem).localname}")
ss_without_dsd = True
# The following seems to only confuse users.
# Thus it is commented out post v1.1.0
# elif "StructureSpecific" not in elem.tag and reader.get_single(
# model.DataStructureDefinition
# log.warning("Ambiguous: dsd=… argument for non–structure-specific message")
# Store values for other methods
reader.push("SS without DSD", ss_without_dsd)
if "Data" in elem.tag:
reader.push("DataSetClass", model.get_class(f"{QName(elem).localname}Set"))
# Instantiate the message object
cls = class_for_tag(elem.tag)
return cls()
def __init__(self, elem, cls_hint=None):
parent_tag = elem.tag
try:
# Use the first child
elem = elem[0]
except IndexError:
raise NotReference
# Extract information from the XML element
if elem.tag == "Ref":
# Element attributes give target_id, id, and version
target_id = elem.attrib["id"]
agency_id = elem.attrib.get("agencyID", None)
id = elem.attrib.get("maintainableParentID", target_id)
version = elem.attrib.get(
"maintainableParentVersion", None
) or elem.attrib.get("version", None)
# Attributes of the element itself, if any
args = (elem.attrib.get("class", None), elem.attrib.get("package", None))
elif elem.tag == "URN":
match = pandasdmx.urn.match(elem.text)
# If the URN doesn't specify an item ID, it is probably a reference to a
# MaintainableArtefact, so target_id and id are the same
target_id = match["item_id"] or match["id"]
agency_id = match["agency"]
id = match["id"]
version = match["version"]
args = (match["class"], match["package"])
else:
raise NotReference
# Find the target class
target_cls = model.get_class(*args)
if target_cls is None:
# Try the parent tag name
target_cls = class_for_tag(parent_tag)
if cls_hint and (target_cls is None or issubclass(cls_hint, target_cls)):
# Hinted class is more specific than target_cls, or failed to find a target
# class above
target_cls = cls_hint
self.maintainable = issubclass(target_cls, model.MaintainableArtefact)
if self.maintainable:
# MaintainableArtefact is the same as the target
cls, id = target_cls, target_id
else:
# Get the class for the parent MaintainableArtefact
cls = model.parent_class(target_cls)
# Store
self.cls = cls
self.agency = model.Agency(id=agency_id) if agency_id else _NO_AGENCY
self.id = id
self.version = version
self.target_cls = target_cls
self.target_id = target_id
def test_get_class():
with pytest.raises(ValueError, match="Package 'codelist' invalid for Category"):
model.get_class(name="Category", package="codelist")