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# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from file_system import FileSystem, FileNotFoundError
class OfflineFileSystem(FileSystem):
'''An offline FileSystem which masquerades as another file system. It throws
FileNotFound error for all operations, and overrides GetName and GetVersion.
'''
def __init__(self, cls):
self._cls = cls
def Read(self, paths, binary=False):
raise FileNotFoundError('File system is offline, cannot read %s' % paths)
def Stat(self, path):
raise FileNotFoundError('File system is offline, cannot read %s' % path)
# HACK: despite GetName/GetVersion being @classmethods, these need to be
# instance methods so that we can grab the name and version from the class
# given on construction.
def GetName(self):
return self._cls.GetName()
def GetVersion(self):
return self._cls.GetVersion()
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