Abstract date specific chunk operation to the date_chunker

Author: bmoscon

arctic/chunkstore/_chunker.py

@@ -61,3 +61,13 @@ def filter(self, data, range_obj):
         data, filtered by range_obj
         """
         raise NotImplementedError
+
+def exclude(self, data, range_obj):
+        """
+        Removes data within the bounds of the range object (inclusive)
+
+        returns
+        -------
+        data, filtered by range_obj
+        """
+        raise NotImplementedError

arctic/chunkstore/chunkstore.py

@@ -86,8 +86,7 @@ def delete(self, symbol, chunk_range=None):
             # read out chunks that fall within the range and filter out
             # data within the range
             df = self.read(symbol, chunk_range=chunk_range, no_filter=True)
-            df = df[(df.index.get_level_values('date') < chunk_range[0]) | (df.index.get_level_values('date') > chunk_range[1])]
-
+            df = self.chunker.exclude(df, chunk_range)
 
             # remove chunks, and update any remaining data
             query = {'symbol': symbol}

arctic/chunkstore/date_chunker.py

@@ -83,6 +83,8 @@ def to_mongo(self, range_obj):
         else:
             return {}
 
-
     def filter(self, data, range_obj):
         return data.ix[range_obj[0]:range_obj[1]]
+
+    def exclude(self, data, range_obj):
+        return data[(data.index.get_level_values('date') < range_obj[0]) | (data.index.get_level_values('date') > range_obj[1])]