LocalFileIdentifiableStore.__len__ counts all directory entries, not just .json store files

[zrgt]

Summary

Severity: Medium
File: sdk/basyx/aas/backend/local_file.py:153

Description

__len__ returns the count of all entries in the store directory, including non-JSON files, hidden files (.DS_Store), and subdirectories.

def __len__(self) -> int:
    return len(os.listdir(self.directory_path))

Callers expecting len(store) == number_of_aas_objects get incorrect results whenever the directory contains anything other than {hash}.json files.

Fix

return sum(1 for f in os.listdir(self.directory_path) if f.endswith(".json"))