def METHOD_NAME(self, filename):
    self.filenames.append(filename)
    self.current_filename = filename
    self.element_builders_by_filename[self.current_filename] = {}
    self.material_builders_by_filename[self.current_filename] = {}
    f = open(filename, "r")
    line = f.readline()
    while line:
        line = line.strip().replace("\t", " ")
        self.read_one_item(f, line)
        line = f.readline()