Use explicit loops instead of _DESCRIPTOR_KEY_TO_CLS in load_directory

Author: zrgt

server/app/model/provider.py

@@ -51,12 +51,6 @@ def __iter__(self) -> Iterator[_DESCRIPTOR_TYPE]:
         return iter(self._backend.values())
 
 
-_DESCRIPTOR_KEY_TO_CLS = (
-    ("assetAdministrationShellDescriptors", descriptor.AssetAdministrationShellDescriptor),
-    ("submodelDescriptors", descriptor.SubmodelDescriptor),
-)
-
-
 def load_directory(directory: Union[Path, str]) -> DictDescriptorStore:
     """
     Load AAS/Submodel descriptor JSON files from a directory into a :class:`DictDescriptorStore`.
@@ -74,12 +68,17 @@ def load_directory(directory: Union[Path, str]) -> DictDescriptorStore:
             continue
         with open(file) as f:
             data = json.load(f, cls=ServerAASFromJsonDecoder)
-        for key, cls in _DESCRIPTOR_KEY_TO_CLS:
-            for item in data.get(key, []):
-                if isinstance(item, cls):
-                    try:
-                        store.add(item)
-                    except KeyError:
-                        pass
+        for item in data.get("assetAdministrationShellDescriptors", []):
+            if isinstance(item, descriptor.AssetAdministrationShellDescriptor):
+                try:
+                    store.add(item)
+                except KeyError:
+                    pass
+        for item in data.get("submodelDescriptors", []):
+            if isinstance(item, descriptor.SubmodelDescriptor):
+                try:
+                    store.add(item)
+                except KeyError:
+                    pass
 
     return store