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# base.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
class LazyMixin(object):
lazy_properties = []
def __init__(self):
self.__baked__ = False
def __getattribute__(self, attr):
val = object.__getattribute__(self, attr)
if val is not None:
return val
else:
self.__prebake__()
return object.__getattribute__(self, attr)
def __bake__(self):
""" This method should be overridden in the derived class. """
raise NotImplementedError(" '__bake__' method has not been implemented.")
def __prebake__(self):
if self.__baked__:
return
self.__bake__()
self.__baked__ = True
def __bake_it__(self):
self.__baked__ = True
class Object(LazyMixin):
"""
Implements an Object which may be Blobs, Trees, Commits and Tags
"""
TYPES = ("blob", "tree", "commit", "tag")
__slots__ = ("repo", "id", "size")
type = None # to be set by subclass
def __init__(self, repo, id, size=None):
"""
Initialize an object by identifying it by its id. All keyword arguments
will be set on demand if None.
``repo``
repository this object is located in
``id``
SHA1 or ref suitable for git-rev-parse
``size``
Size of the object's data in bytes
"""
super(Object,self).__init__()
self.repo = repo
self.id = id
self.size = size
def __bake__(self):
"""
Retrieve object information
"""
self.size = int(self.repo.git.cat_file(self.id, s=True).rstrip())
def __eq__(self, other):
"""
Returns
True if the objects have the same SHA1
"""
return self.id == other.id
def __ne__(self, other):
"""
Returns
True if the objects do not have the same SHA1
"""
return self.id != other.id
def __hash__(self):
"""
Returns
Hash of our id allowing objects to be used in dicts and sets
"""
return hash(self.id)
def __str__(self):
"""
Returns
string of our SHA1 as understood by all git commands
"""
return self.id
def __repr__(self):
"""
Returns
string with pythonic representation of our object
"""
return '<git.%s "%s">' % (self.__class__.__name__, self.id)
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