gistfile1.java

@Test 
public void testGetPrescription() throws Exception {
	NewPrescription prescription = new NewPrescription();
	assertEquals("two pill a day", prescription.getPrescription(new SeriousPatientStatus(),  new AdultPatientType()));
	assertEquals("one pill a day", prescription.getPrescription(new MildPatientStatus(), new AdultPatientType()));
	assertEquals("one pill a day", prescription.getPrescription(new SeriousPatientStatus(), new ChildPatientType()));
	assertEquals("half pill a day", prescription.getPrescription(new MildPatientStatus(), new ChildPatientType()));
}
	
public interface PatientStatus {
	String getPrescriptionWith(PatientType type);
	double getMaxIngrestionPerDayWith(PatientType type);
}
	
public interface PatientType {
	String getPrescriptionSerious();
	double getMaxIngrestionSerious();
	String getPrescriptionMild();
	double getMaxIngrestionMild();
}

public class AdultPatientType implements PatientType {
	@Override
	public String getPrescriptionSerious() {
		return "two pill a day";
	}

	@Override
	public double getMaxIngrestionSerious() {
		return 2;
	}

	@Override
	public String getPrescriptionMild() {
		return "one pill a day";
	}

	@Override
	public double getMaxIngrestionMild() {
		return 1;
	}
}

public class ChildPatientType implements PatientType {
	@Override
	public String getPrescriptionSerious() {
		return "one pill a day";
	}

	@Override
	public double getMaxIngrestionSerious() {
		return 1;
	}

	@Override
	public String getPrescriptionMild() {
		return "half pill a day";
	}

	@Override
	public double getMaxIngrestionMild() {
		return 0;
	}
}

public class MildPatientStatus implements PatientStatus {
	@Override
	public String getPrescriptionWith(PatientType type) {
		return type.getPrescriptionMild();
	}

	@Override
	public double getMaxIngrestionPerDayWith(PatientType type) {
		return type.getMaxIngrestionMild();
	}
}

public class SeriousPatientStatus implements PatientStatus {
	@Override
	public String getPrescriptionWith(PatientType type) {
		return type.getPrescriptionSerious();
	}

	@Override
	public double getMaxIngrestionPerDayWith(PatientType type) {
		return type.getMaxIngrestionSerious();
	}
}

public class NewPrescription {
	public String getPrescription(PatientStatus status, PatientType type) {
		return status.getPrescriptionWith(type);	
	}
	
	public double getMaxIngestionPerDay(PatientStatus status, PatientType type) {
		return status.getMaxIngrestionPerDayWith(type);			
	}
}