def Preload(self, path):
    path = encoder.MaybeNarrowPath(path)

    # Get down to a base name
    path = os.path.normpath(path)
    base = os.path.basename(path).lower()
    if not base:
      output.Error('Couldn\'t parse the file path: %s' % path)
      return False
    lenbase = len(base)

    # Recognize extension
    lensuffix = 0
    compare_suffix = ['.xml', '.xml.gz', '.gz']
    for suffix in compare_suffix:
      if base.endswith(suffix):
        lensuffix = len(suffix)
        break
    if not lensuffix:
      output.Error('The path "%s" doesn\'t end in a supported file '
                   'extension.' % path)
      return False
    self.is_gzip = suffix.endswith('.gz')

    # Split the original path
    lenpath = len(path)
    self._path   = path[:lenpath-lenbase]
    self._prefix = path[lenpath-lenbase:lenpath-lensuffix]
    self._suffix = path[lenpath-lensuffix:]

    return True
  #end def Preload
Splits up a path into forms ready for recombination.
dataset/ETHPy150Open benoitc/restkit/doc/sitemap_gen.py/FilePathGenerator.Preload