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class FrozenException(Exception): pass
class NotLoadedYet(Exception): pass
class FSObject(object):
def __init__(self, path):
self.path = path
self.exists = False
self.accessible = False
self.marked = False
self.tagged = False
self.frozen = False
self.loaded = False
self.stat = None
def clone(self):
clone = type(self)(self.path)
for key in iter(self.__dict__):
clone.__dict__[key] = self.__dict__[key]
return clone
def load(self):
self.stop_if_frozen()
self.loaded = True
import os
try:
self.stat = os.stat(self.path)
self.exists = True
self.accessible = True
except OSError:
self.exists = False
self.accessible = False
def load_once(self):
self.stop_if_frozen()
if not self.loaded: self.load()
def load_if_outdated(self):
self.stop_if_frozen()
import os
if not self.loaded:
self.load()
return True
real_mtime = os.stat(self.path).st_mtime
cached_mtime = self.stat.st_mtime
if real_mtime != cached_mtime:
self.load()
return True
return False
def frozen_clone(self):
self.stop_if_frozen()
return self.clone().freeze()
def stop_if_frozen(self):
if self.frozen: raise FrozenException()
def freeze(self):
self.frozen = True
return self
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