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class NotLoadedYet(Exception):
pass
T_FILE = 'file'
T_DIRECTORY = 'directory'
T_UNKNOWN = 'unknown'
T_NONEXISTANT = 'nonexistant'
BAD_INFO = None
class FileSystemObject(object):
def __init__(self, path):
if type(self) == FileSystemObject:
raise TypeError("FileSystemObject is an abstract class and cannot be initialized.")
from os.path import basename
self.path = path
self.basename = basename(path)
self.exists = False
self.accessible = False
self.marked = False
self.tagged = False
self.frozen = False
self.loaded = False
self.runnable = False
self.islink = False
self.brokenlink = False
self.stat = None
self.infostring = None
self.permissions = None
self.type = T_UNKNOWN
def __str__(self):
return str(self.path)
# load() reads useful information about the file from the file system
# and caches it in instance attributes.
def load(self):
self.loaded = True
import os
if os.access(self.path, os.F_OK):
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 = T_DIRECTORY
try:
self.size = len(os.listdir(self.path))
self.infostring = ' %d' % self.size
self.runnable = True
except OSError:
self.infostring = BAD_INFO
self.runnable = False
self.accessible = False
elif os.path.isfile(self.path):
self.type = T_FILE
self.size = self.stat.st_size
self.infostring = ' %d' % self.stat.st_size
else:
self.type = T_UNKNOWN
self.infostring = None
else:
self.islink = False
self.infostring = None
self.type = T_NONEXISTANT
self.exists = False
self.runnable = False
self.accessible = False
def load_once(self):
if not self.loaded:
self.load()
return True
return False
def load_if_outdated(self):
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
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