How to use the dfvfs.path.factory.Factory function in dfvfs

def testNormalizedVolumeIdentifiersPartitionedImage(self):
    """Tests the _NormalizedVolumeIdentifiers function."""
    test_mediator = TestVolumeScannerMediator()
    test_scanner = volume_scanner.VolumeScanner(mediator=test_mediator)

    test_path = self._GetTestFilePath(['tsk_volume_system.raw'])
    self._SkipIfPathNotExists(test_path)

    test_os_path_spec = path_spec_factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_OS, location=test_path)
    test_raw_path_spec = path_spec_factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_RAW, parent=test_os_path_spec)
    test_tsk_partition_path_spec = path_spec_factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_TSK_PARTITION, parent=test_raw_path_spec)

    volume_system = tsk_volume_system.TSKVolumeSystem()
    volume_system.Open(test_tsk_partition_path_spec)

    volume_identifiers = test_scanner._NormalizedVolumeIdentifiers(
        volume_system, ['p1', 'p2'], prefix='p')
    self.assertEqual(volume_identifiers, ['p1', 'p2'])

    volume_identifiers = test_scanner._NormalizedVolumeIdentifiers(
        volume_system, ['1', '2'], prefix='p')
    self.assertEqual(volume_identifiers, ['p1', 'p2'])

self._SkipIfPathNotExists(test_artifacts_path)

    test_file_path = self._GetTestFilePath(['ímynd.dd'])
    self._SkipIfPathNotExists(test_file_path)

    registry = artifacts_registry.ArtifactDefinitionsRegistry()
    reader = artifacts_reader.YamlArtifactsReader()
    registry.ReadFromDirectory(reader, test_artifacts_path)

    test_engine = single_process.SingleProcessEngine()
    resolver_context = context.Context()
    session = sessions.Session()

    os_path_spec = path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_OS, location=test_file_path)
    source_path_spec = path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_TSK, location='/',
        parent=os_path_spec)

    test_engine.PreprocessSources(registry, [source_path_spec])

    storage_writer = fake_writer.FakeStorageWriter(session)

    configuration = configurations.ProcessingConfiguration()
    configuration.parser_filter_expression = 'filestat'

    test_engine.ProcessSources(
        [source_path_spec], storage_writer, resolver_context, configuration)

    self.assertEqual(storage_writer.number_of_events, 15)

def testCalculateDigestHash(self):
    """Tests the _CalculateDigestHash function."""
    test_file_path = self._GetTestFilePath(['ímynd.dd'])
    self._SkipIfPathNotExists(test_file_path)

    test_tool = image_export_tool.ImageExportTool()

    os_path_spec = path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_OS, location=test_file_path)
    tsk_path_spec = path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_TSK, inode=16,
        location='/a_directory/another_file', parent=os_path_spec)

    file_entry = path_spec_resolver.Resolver.OpenFileEntry(tsk_path_spec)
    digest_hash = test_tool._CalculateDigestHash(file_entry, '')
    expected_digest_hash = (
        'c7fbc0e821c0871805a99584c6a384533909f68a6bbe9a2a687d28d9f3b10c16')
    self.assertEqual(digest_hash, expected_digest_hash)

    os_path_spec = path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_OS, location=test_file_path)
    tsk_path_spec = path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_TSK, inode=12,
        location='/a_directory', parent=os_path_spec)

def testCredentialGetSet(self):
    """Tests the GetCredential and SetCredential functions."""
    test_keychain = keychain.KeyChain()

    fake_path_spec = factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_FAKE, location='/test')
    bde_path_spec = factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_BDE, parent=fake_path_spec)

    with self.assertRaises(AttributeError):
      test_keychain.SetCredential(fake_path_spec, 'password', 'TEST')

    test_keychain.SetCredential(bde_path_spec, 'password', 'TEST')

    credential = test_keychain.GetCredential(fake_path_spec, 'password')
    self.assertIsNone(credential)

    credential = test_keychain.GetCredential(bde_path_spec, 'password')
    self.assertEqual(credential, 'TEST')

    credentials = test_keychain.GetCredentials(bde_path_spec)

for volume_identifier in sorted(volume_identifiers):
  volume = volume_system.GetVolumeByIdentifier(volume_identifier)
  if not volume:
    raise RuntimeError(
        u'Volume missing for identifier: {0:s}.'.format(volume_identifier))

  volume_extent = volume.extents[0]
  print(
      u'{0:s}\t\t{1:d} (0x{1:08x})\t{2:d}'.format(
          volume.identifier, volume_extent.offset, volume_extent.size))

  volume_path_spec = path_spec_factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_TSK_PARTITION, location=u'/'+volume_identifier,
        parent=path_spec)

  mft_path_spec = path_spec_factory.Factory.NewPathSpec(
        definitions.TYPE_INDICATOR_TSK, location=u'/$MFT',
        parent=volume_path_spec)

  file_entry = resolver.Resolver.OpenFileEntry(mft_path_spec)


  stat_object = file_entry.GetStat()

  print(u'Inode: {0:d}'.format(stat_object.ino))
  print(u'Inode: {0:s}'.format(file_entry.name))
  outFile = volume_identifier+file_entry.name
  extractFile = open(outFile,'wb')
  file_object = file_entry.GetFileObject()

  data = file_object.read(4096)
  while data:

  @property
  def comparable(self):
    """str: comparable representation of the path specification."""
    string_parts = []

    if self.data_stream:
      string_parts.append('data stream: {0:s}'.format(self.data_stream))
    if self.inode is not None:
      string_parts.append('inode: {0:d}'.format(self.inode))
    if self.location is not None:
      string_parts.append('location: {0:s}'.format(self.location))

    return self._GetComparable(sub_comparable_string=', '.join(string_parts))


factory.Factory.RegisterPathSpec(TSKPathSpec)

def OpenFile(self, windows_path):
    """Opens the file specificed by the Windows path.

    Args:
      windows_path (str): Windows path to the file.

    Returns:
      dfvfs.FileIO: file-like object or None if the file does not exist.
    """
    if not self._single_file:
      return super(WindowsVolumeCollector, self).OpenFile(windows_path)

    # TODO: check name of single file.
    path_spec = dfvfs_path_spec_factory.Factory.NewPathSpec(
        dfvfs_definitions.TYPE_INDICATOR_OS, location=self._source_path)
    if path_spec is None:
      return

    return dfvfs_resolver.Resolver.OpenFileObject(path_spec)

into a storage media image or a directory accessible by the operating
    system.

    Args:
      file_system (FileSystem): a file system.
      mount_point (PathSpec): mount point path specification.
      drive_letter (Optional[str]): drive letter used by the file system.

    Raises:
      PathSpecError: if the mount point path specification is incorrect.
      ValueError: when file system or mount point is not set.
    """
    if not file_system or not mount_point:
      raise ValueError('Missing file system or mount point value.')

    if path_spec_factory.Factory.IsSystemLevelTypeIndicator(
        file_system.type_indicator):
      if not hasattr(mount_point, 'location'):
        raise errors.PathSpecError(
            'Mount point path specification missing location.')

    super(WindowsPathResolver, self).__init__()

    self._drive_letter = drive_letter
    self._environment_variables = {}
    self._file_system = file_system
    self._mount_point = mount_point