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(WIP) implementing CBD language... Meta-meta-model: Association inherits from Class. Matcher accepts pivot. Add generic graphviz renderer.

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This commit is contained in:
Joeri Exelmans 2024-11-07 09:46:29 +01:00
parent a26ceef10f
commit 1eb8a84553
25 changed files with 542 additions and 170 deletions
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18
api/od.py
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@ -118,7 +118,13 @@ class ODAPI:
)[0]
def get(self, name: str):
return self.bottom.read_outgoing_elements(self.m, name)[0]
results = self.bottom.read_outgoing_elements(self.m, name)
if len(results) == 1:
return results[0]
elif len(results) >= 2:
raise Exception("this should never happen")
else:
raise Exception(f"No such element in model: '{name}'")
def get_type_name(self, obj: UUID):
return self.get_name(self.get_type(obj))
@ -144,6 +150,9 @@ class ODAPI:
slot = self.get_slot(obj, attr_name)
return self.get_value(slot)
# Returns the given default value if the slot does not exist on the object.
# The attribute must exist in the object's class, or an exception will be thrown.
# The slot may not exist however, if the attribute is defined as 'optional' in the class.
def get_slot_value_default(self, obj: UUID, attr_name: str, default: any):
try:
return self.get_slot_value(obj, attr_name)
@ -187,7 +196,12 @@ class ODAPI:
def create_link(self, link_name: Optional[str], assoc_name: str, src: UUID, tgt: UUID):
global NEXT_ID
typ, = self.bottom.read_outgoing_elements(self.mm, assoc_name)
types = self.bottom.read_outgoing_elements(self.mm, assoc_name)
if len(types) == 0:
raise Exception(f"No such association: '{assoc_name}'")
elif len(types) >= 2:
raise Exception(f"More than one association exists with name '{assoc_name}' - this means the MM is invalid.")
typ = types[0]
if link_name == None:
link_name = f"__{assoc_name}{NEXT_ID}"
NEXT_ID += 1