diff options
Diffstat (limited to 'lib/git/utils.py')
| -rw-r--r-- | lib/git/utils.py | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/git/utils.py b/lib/git/utils.py index c204c432..39994bd5 100644 --- a/lib/git/utils.py +++ b/lib/git/utils.py @@ -24,3 +24,28 @@ def is_git_dir(d): (os.path.islink(headref) and os.readlink(headref).startswith('refs')) return False + + +class LazyMixin(object): + __slots__ = tuple() + + def __getattr__(self, attr): + """ + Whenever an attribute is requested that we do not know, we allow it + to be created and set. Next time the same attribute is reqeusted, it is simply + returned from our dict/slots. + """ + self._set_cache_(attr) + # will raise in case the cache was not created + return object.__getattribute__(self, attr) + + def _set_cache_(self, attr): + """ This method should be overridden in the derived class. + It should check whether the attribute named by attr can be created + and cached. Do nothing if you do not know the attribute or call your subclass + + The derived class may create as many additional attributes as it deems + necessary in case a git command returns more information than represented + in the single attribute.""" + pass + |