def __write_constant_class(self):
helper = ConstantClass(self._class_name, self._io)<EOL>content = helper.source_with_constants(self._constants)<EOL>Util.write_two_phases(helper.file_name(), content, self._io)<EOL>
Inserts new and replaces old (if any) constant declaration statements in the class that acts like a namespace
for constants.