metadata separation

rainbowadn/collection/trees/binary/core/binarybalancing.py

@@ -1,8 +1,9 @@
+import abc
 from typing import Generic, TypeVar
 
 from rainbowadn.collection.comparison import *
 from rainbowadn.core import *
-from .binarycreation import *
+from .binarymetadata import *
 from .binaryprotocolized import *
 
 __all__ = ('BinaryBalancing',)
@@ -12,32 +13,16 @@ ActiveKeyType = TypeVar('ActiveKeyType')
 MetaDataType = TypeVar('MetaDataType')
 
 
-class BinaryBalancing(Generic[ActiveKeyType, MetaDataType, TreeType]):
+class BinaryBalancing(
+    BinaryMetadata[ActiveKeyType, MetaDataType, TreeType],
+    Generic[ActiveKeyType, MetaDataType, TreeType],
+    abc.ABC
+):
     def __init__(self, comparator_: Comparator[ActiveKeyType], empty_metadata: HashPoint[MetaDataType]):
         assert isinstance(comparator_, Comparator)
         assert isinstance(empty_metadata, HashPoint)
         self.comparator = comparator_
-        self.empty_metadata = empty_metadata
-
-    async def metadata(
-            self,
-            treel: TreeType,
-            treer: TreeType,
-            key: HashPoint[ActiveKeyType],
-            creation: BinaryCreation[ActiveKeyType, MetaDataType, TreeType],
-    ) -> HashPoint[MetaDataType]:
-        raise NotImplementedError
-
-    async def verify_metadata(
-            self,
-            treel: TreeType,
-            treer: TreeType,
-            key: HashPoint[ActiveKeyType],
-            metadata: HashPoint[MetaDataType],
-            creation: BinaryCreation[ActiveKeyType, MetaDataType, TreeType],
-    ) -> bool:
-        assert_eq(await self.metadata(treel, treer, key, creation), metadata)
-        return True
+        super().__init__(empty_metadata)
 
     async def balance(
             self,

rainbowadn/collection/trees/binary/core/binarymetadata.py

@@ -0,0 +1,36 @@
+from typing import Generic, TypeVar
+
+from rainbowadn.core import *
+from .binarycreation import *
+
+__all__ = ('BinaryMetadata',)
+
+TreeType = TypeVar('TreeType')
+ActiveKeyType = TypeVar('ActiveKeyType')
+MetaDataType = TypeVar('MetaDataType')
+
+
+class BinaryMetadata(Generic[ActiveKeyType, MetaDataType, TreeType]):
+    def __init__(self, empty_metadata: HashPoint[MetaDataType]):
+        assert isinstance(empty_metadata, HashPoint)
+        self.empty_metadata = empty_metadata
+
+    async def metadata(
+            self,
+            treel: TreeType,
+            treer: TreeType,
+            key: HashPoint[ActiveKeyType],
+            creation: BinaryCreation[ActiveKeyType, MetaDataType, TreeType],
+    ) -> HashPoint[MetaDataType]:
+        raise NotImplementedError
+
+    async def verify_metadata(
+            self,
+            treel: TreeType,
+            treer: TreeType,
+            key: HashPoint[ActiveKeyType],
+            metadata: HashPoint[MetaDataType],
+            creation: BinaryCreation[ActiveKeyType, MetaDataType, TreeType],
+    ) -> bool:
+        assert_eq(await self.metadata(treel, treer, key, creation), metadata)
+        return True