public PrimeGeneratorAlgorithm getPrimeGeneratorAlgorithm(String s) {
		PrimeGeneratorAlgorithm algo = null;
		
		if (s.equals(PG_A)) {
			algo = new PrimeAlgo01();
		} else if (s.equals(PG_B)) {
			algo = new PrimeAlgo02();
		} // to be continued
		
		return algo;
	}