OnJava8-Examples/annotations/UseCaseTracker.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// annotations/UseCaseTracker.java

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

// Visit http://OnJava8.com for more book information.

import java.util.*;

import java.util.stream.*;

import java.lang.reflect.*;

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() + "\n " + uc.description());

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

}

useCases.forEach(i ->

System.out.println("Missing use case " + i));

}

public static void main(String[] args) {

List<Integer> useCases = IntStream.range(47, 51)

.boxed().collect(Collectors.toList());

trackUseCases(useCases, PasswordUtils.class);

}

/* Output:

Found Use Case 49

New passwords can't equal previously used ones

Found Use Case 48

no description

Found Use Case 47

Passwords must contain at least one numeric

Missing use case 50