[breaking] i18n - Introduced Messages.keys(Locale) allowing to list a…

…vailable Messages keys for a given Locale.

If you implemented your own Messages implementation, it will break your code : simply provide same implementation for keys(), without fixing the Locale.

restx-i18n/src/main/java/restx/i18n/DefaultMessages.java

@@ -55,11 +55,16 @@ public String getMessage(String key, MessageParams params, Locale locale) {
     }
 
     @Override
-    public Iterable<String> keys() {
-        Optional<ResourceBundle> bundle = getBundle(Locale.ROOT);
+    public Iterable<String> keys(Locale locale) {
+        Optional<ResourceBundle> bundle = getBundle(locale);
         return bundle.isPresent() ? Ordering.natural().sortedCopy(bundle.get().keySet()) : Collections.<String>emptySet();
     }
 
+    @Override
+    public Iterable<String> keys() {
+        return keys(Locale.ROOT);
+    }
+
     @Override
     public Iterable<Entry<String, String>> entries(Locale locale) {
         Optional<ResourceBundle> rootBundle = getBundle(Locale.ROOT);

restx-i18n/src/main/java/restx/i18n/Messages.java

@@ -8,6 +8,14 @@
  * an interpolation mechanism using a mustache like format, making it easier to use in Javascript client too.
  */
 public interface Messages {
+    /**
+     * Return the list of message keys available in this Messages instance, for given Locale
+     *
+     * @param locale the locale in which the keys should be resolved.
+     * @return the list of keys, as an Iterable
+     */
+    Iterable<String> keys(Locale locale);
+
     /**
      * Return the list of message keys available in this Messages instance.
      *