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from types import TupleType
class ChangeDict(dict):
"""\
A simple dictionary which also stores the "times" an object was last updated.
Used so that we only upload/download items which have changed.
"""
def __init__(self):
dict.__init__(self)
self.times = {}
def __setitem__(self, key, value):
"""\
This set item is special, it only takes keys of the form,
(<last modified time>, <normal key>)
"""
if type(value) is TupleType and len(value) == 2:
time, value = value
else:
time = -1
if time != -1 and self.times.has_key(key) and self.times[key] > time:
raise ValueError("The object isn't new enough to update the dictionary with! Current %s, update %s" % (self.times[key], time))
self.times[key] = time
dict.__setitem__(self, key, value)
def __delitem__(self, key):
del self.times[key]
dict.__delitem__(self, key)
ChangeDict.__repr__ = dict.__repr__
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