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# utils.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
import os
class LazyMixin(object):
"""
Base class providing an interface to lazily retrieve attribute values upon
first access. If slots are used, memory will only be reserved once the attribute
is actually accessed and retrieved the first time. All future accesses will
return the cached value as stored in the Instance's dict or slot.
"""
__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
class IterableList(list):
"""
List of iterable objects allowing to query an object by id or by named index::
heads = repo.heads
heads.master
heads['master']
heads[0]
"""
__slots__ = '_id_attr'
def __new__(cls, id_attr):
return super(IterableList,cls).__new__(cls)
def __init__(self, id_attr):
self._id_attr = id_attr
def __getattr__(self, attr):
for item in self:
if getattr(item, self._id_attr) == attr:
return item
# END for each item
return list.__getattribute__(self, attr)
def __getitem__(self, index):
if isinstance(index, int):
return list.__getitem__(self,index)
try:
return getattr(self, index)
except AttributeError:
raise IndexError( "No item found with id %r" % index )
class Iterable(object):
"""
Defines an interface for iterable items which is to assure a uniform
way to retrieve and iterate items within the git repository
"""
__slots__ = tuple()
_id_attribute_ = "attribute that most suitably identifies your instance"
@classmethod
def list_items(cls, repo, *args, **kwargs):
"""
Find all items of this type - subclasses can specify args and kwargs differently.
If no args are given, subclasses are obliged to return all items if no additional
arguments arg given.
Note: Favor the iter_items method as it will
Returns:
list(Item,...) list of item instances
"""
#return list(cls.iter_items(repo, *args, **kwargs))
out_list = IterableList( cls._id_attribute_ )
out_list.extend(cls.iter_items(repo, *args, **kwargs))
return out_list
@classmethod
def iter_items(cls, repo, *args, **kwargs):
"""
For more information about the arguments, see list_items
Return:
iterator yielding Items
"""
raise NotImplementedError("To be implemented by Subclass")
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