[ZODB-Dev] RE: B-Tree API - again!

[Steve Alexander]

Gfeller Martin wrote:
> Sorry to be re-iterate my question, but all the interesting answers
> do not address our concern, namely to have a compatible interface
> between B-Tree and PersistentMapping/dictionary.
> 
> Our aim is to replace PersistentMappings by OOBTrees in a large body
> of existing code, so we would profit from a do-nothing sort() method
> on the OOBTreeItems object returned by keys().

I suggest you write your own subclass of OOBTree that returns an 
OOBTreeItems, like this (untested):

class MyOOBTree(OOBTree):

     def keys(self, min=None, max=None):
         return MyOOBTreeItems(OOBTree.keys(min, max))

class MyOOBTreeItems(object):

     __slots__ = ['__items']

     def __init__(self, items):
         self.__items = items

     def __getitem__(self, index):
         return self.__items[index]

     def __getslice__(self, start, end):
         return self.__items[start:end]

     def __len__(self):
         return len(self.__items)

     def __nonzero__(self):
         return self.__items.__nonzero__

     def sort(self):
         # XXX log deprecation warning
         pass


--
Steve Alexander