// annotations/UseCaseTracker.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

import java.lang.reflect.*;

import java.util.*;

public class UseCaseTracker {

public static void

trackUseCases(List<Integer> useCases, Class<?> cl) {

for(Method m : cl.getDeclaredMethods()) {

UseCase uc = m.getAnnotation(UseCase.class);

if(uc != null) {

System.out.println("Found Use Case:" + uc.id() +

" " + uc.description());

useCases.remove(new Integer(uc.id()));

}

}

for(int i : useCases) {

System.out.println(

"Warning: Missing use case-" + i);

}

}

public static void main(String[] args) {

// <* Can't use Arrays.asList() for some reason *>

List<Integer> useCases = new ArrayList<>();

Collections.addAll(useCases, 47, 48, 49, 50);

trackUseCases(useCases, PasswordUtils.class);

}

}

/* Output:

Found Use Case:49 New passwords can't equal previously used

ones

Found Use Case:47 Passwords must contain at least one

numeric

Found Use Case:48 no description

Warning: Missing use case-50

*/