private function determine()
	{

		if (false !== $this->filepath && true === is_readable($this->filepath . '/' . $this->filename)) {
			return strtolower(trim(file_get_contents($this->filepath . '/' . $this->filename)));
		} elseif (null !== getenv($this->variable)) {
			return getenv($this->variable);
		} else {
			return false;
		}
	}