helper to extract node ids as integers

Author: robfitzgerald

nrel/hive/model/roadnetwork/link_id.py

@@ -45,6 +45,29 @@ def extract_node_ids(
         return None, (src, dst)
 
 
+def extract_node_ids_int(
+    link_id: LinkId
+) -> Tuple[Optional[Exception], Optional[Tuple[int, int]]]:
+    """node ids can be strings for the haversine case but for networkx graphs they must be
+    integers as they are treated as indices.
+
+    :param link_id: link id to read
+    :type link_id: LinkId
+    :return: _description_
+    :rtype: Tuple[Optional[Exception], Optional[Tuple[int, int]]]
+    """
+    err, ids = extract_node_ids(link_id)
+    if err is not None or ids is None:
+        return err, None
+    else:
+        try:
+            src_str, dst_str = ids
+            src = int(src_str)
+            dst = int(dst_str)
+            return None, (src, dst)
+        except ValueError as e:
+            return e, None
+
 def reverse_link_id(
     link_id: LinkId,
 ) -> Tuple[Optional[Exception], Optional[LinkId]]: