/usr/lib/python2.7/dist-packages/BTrees/Length.py is in python-zodb 1:3.9.7-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
#
##############################################################################
import persistent
class Length(persistent.Persistent):
"""BTree lengths are too expensive to compute
Objects that use BTrees need to keep track of lengths themselves.
This class provides an object for doing this.
As a bonus, the object support application-level conflict
resolution.
It is tempting to to assign length objects to __len__ attributes
to provide instance-specific __len__ methods. However, this no
longer works as expected, because new-style classes cache
class-defined slot methods (like __len__) in C type slots. Thus,
instance-define slot fillers are ignores.
"""
def __init__(self, v=0):
self.value = v
def __getstate__(self):
return self.value
def __setstate__(self, v):
self.value = v
def set(self, v):
self.value = v
def _p_resolveConflict(self, old, s1, s2):
return s1 + s2 - old
def _p_independent(self):
# My state doesn't depend on or materially effect the state of
# other objects.
return 1
def change(self, delta):
self.value += delta
def __call__(self, *args):
return self.value
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