From ae5afcd0a7b42fe2dce90f0093e6157e57bf1554 Mon Sep 17 00:00:00 2001 From: Lars Wirzenius Date: Sat, 24 Jun 2017 12:01:47 +0300 Subject: Add: CowDelta --- obnamlib/fmt_ga/cowdelta.py | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 obnamlib/fmt_ga/cowdelta.py (limited to 'obnamlib/fmt_ga/cowdelta.py') diff --git a/obnamlib/fmt_ga/cowdelta.py b/obnamlib/fmt_ga/cowdelta.py new file mode 100644 index 00000000..a5413d54 --- /dev/null +++ b/obnamlib/fmt_ga/cowdelta.py @@ -0,0 +1,40 @@ +# Copyright 2017 Lars Wirzenius +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# +# =*= License: GPL-3+ =*= + + +class CowDelta(object): + + def __init__(self): + self._dict = {} + + def __contains__(self, key): + return key in self._dict + + def keys(self): + return self._dict.keys() + + def set(self, key, value): + self._dict[key] = value + + def get(self, key): + return self._dict[key] + + def remove(self, key): + self._dict[key] = removed_key + + +removed_key = object() -- cgit v1.2.1