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import fstype
class FrozenException(Exception): pass
class NotLoadedYet(Exception): pass
class FSObject(object):
def __init__(self, path):
if type(self) == FSObject:
raise TypeError("FSObject is an abstract class and cannot be initialized.")
self.path = path
self.exists = False
self.accessible = False
self.marked = False
self.tagged = False
self.frozen = False
self.loaded = False
self.islink = False
self.brokenlink = False
self.stat = None
self.infostring = None
self.permissions = None
self.type = fstype.Unknown
# load() reads useful information about the file from the file system
# and caches it in instance attributes.
def load(self):
self.stop_if_frozen()
self.loaded = True
import os
try:
self.stat = os.stat(self.path)
self.islink = os.path.islink(self.path)
self.exists = True
self.accessible = True
if os.path.isdir(self.path):
self.type = fstype.Directory
self.infostring = ' %d' % len(os.listdir(self.path))
elif os.path.isfile(self.path):
self.type = fstype.File
self.infostring = ' %d' % self.stat.st_size
else:
self.type = fstype.Unknown
self.infostring = None
except OSError:
self.islink = False
self.infostring = None
self.type = fstype.Nonexistent
self.exists = False
self.accessible = False
def load_once(self):
self.stop_if_frozen()
if not self.loaded:
self.load()
return True
return False
def load_if_outdated(self):
self.stop_if_frozen()
if self.load_once(): return True
import os
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 clone(self):
clone = type(self)(self.path)
for key in iter(self.__dict__):
clone.__dict__[key] = self.__dict__[key]
return clone
def frozen_clone(self):
clone = self.clone()
clone.frozen = True
return clone
def stop_if_frozen(self):
if self.frozen: raise FrozenException()
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