test/tools/jlink/plugins/GetAvailableLocales.java

*** 21,42 ****
   * questions.
   */
  
  import java.util.Arrays;
  import java.util.Locale;
  import java.util.stream.Collectors;
  
  class GetAvailableLocales {
  
      public static void main(String[] args) {
!         String availableLocales = Arrays.stream(Locale.getAvailableLocales())
!             .map(l -> l.toString())
!             .sorted()
!             .collect(Collectors.joining(" "));
  
!         if (!availableLocales.equals(args[0])) {
!             throw new RuntimeException("Available locales are not equal to the expected ones.\n" +
!                 "Expected: " + args[0] + "\n" +
!                 "Actual:   " + availableLocales);
          }
      }
  }
--- 21,58 ----
   * questions.
   */
  
  import java.util.Arrays;
  import java.util.Locale;
+ import java.util.Set;
+ import java.util.TreeSet;
  import java.util.stream.Collectors;
  
  class GetAvailableLocales {
  
      public static void main(String[] args) {
!         Set<String> expected = Set.of(args);
!         Set<String> actual =
!             Arrays.stream(Locale.getAvailableLocales())
!                   // "(root)" for Locale.ROOT rather than ""
!                   .map(loc -> loc.equals(Locale.ROOT) ? "(root)" : loc.toString())
!                   .collect(Collectors.toSet());
  
!         if (!expected.equals(actual)) {
!             diff(expected, actual);
!             System.exit(1);
!         }
!     }
! 
!     private static void diff(Set<String> expected, Set<String> actual) {
!         Set<String> s1 = new TreeSet<>(expected);
!         s1.removeAll(actual);
!         if (!s1.isEmpty()) {
!             System.out.println("\tMissing locale(s): " + s1);
!         }
!         Set<String> s2 = new TreeSet<>(actual);
!         s2.removeAll(expected);
!         if (!s2.isEmpty()) {
!             System.out.println("\tExtra locale(s): " + s2);
          }
      }
  }