Introduced CurrentLocaleResolver component allowing to override implementation for guessing current locale in MessagesRouter

It may be useful if, for instance, request.getLocale() is not *always* used to guess current user's locale
(for instance if the user's locale is part of the user's data)

Author: fcamblor

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

@@ -0,0 +1,13 @@
+package restx.i18n;
+
+import restx.RestxRequest;
+import restx.StdRequest;
+
+import java.util.Locale;
+
+/**
+ * @author fcamblor
+ */
+public interface CurrentLocaleResolver {
+    Locale guessLocale(RestxRequest request);
+}

restx-i18n/src/main/java/restx/i18n/I18nModule.java

@@ -2,6 +2,7 @@
 
 import restx.AppSettings;
 import restx.RestxContext;
+import restx.RestxRequest;
 import restx.factory.Module;
 import restx.factory.Provides;
 
@@ -25,6 +26,16 @@ public Messages messages(AppSettings appSettings) {
         }
     }
 
+    @Provides @Named("CurrentLocaleResolver")
+    public CurrentLocaleResolver currentLocaleResolver(){
+        return new CurrentLocaleResolver() {
+            @Override
+            public Locale guessLocale(RestxRequest request) {
+                return request.getLocale();
+            }
+        };
+    }
+
     @Provides @Named("ROOT")
     public SupportedLocale rootSupportedLocale() {
         return new SupportedLocale(Locale.ROOT);

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

@@ -23,21 +23,24 @@
 @Component
 public class MessagesRouter extends RestxRouter {
     public MessagesRouter(@Named("Messages") Messages messages,
-                          @Named("restx.i18n.labelsJsTemplate") String labelsJsTemplate) {
-        super("MessagesRouter", new JsonLabelsRoute(messages), new JsLabelsRoute(messages, labelsJsTemplate));
+                          @Named("restx.i18n.labelsJsTemplate") String labelsJsTemplate,
+                          @Named("CurrentLocaleResolver") CurrentLocaleResolver currentLocaleResolver) {
+        super("MessagesRouter", new JsonLabelsRoute(messages, currentLocaleResolver), new JsLabelsRoute(messages, labelsJsTemplate, currentLocaleResolver));
     }
 
     private static class JsonLabelsRoute extends StdRoute {
         private final Messages messages;
+        private CurrentLocaleResolver currentLocaleResolver;
 
-        public JsonLabelsRoute(Messages messages) {
+        public JsonLabelsRoute(Messages messages, CurrentLocaleResolver currentLocaleResolver) {
             super("labels.json", new StdRestxRequestMatcher("GET", "/i18n/labels.json"));
             this.messages = messages;
+            this.currentLocaleResolver = currentLocaleResolver;
         }
 
         @Override
         public void handle(RestxRequestMatch match, RestxRequest req, RestxResponse resp, RestxContext ctx) throws IOException {
-            Iterable<Entry<String, String>> entries = messages.entries(req.getLocale());
+            Iterable<Entry<String, String>> entries = messages.entries(currentLocaleResolver.guessLocale(req));
             handleETagFor(req, resp, entries);
             resp.setStatus(HttpStatus.OK);
             resp.setContentType("application/json");
@@ -50,12 +53,14 @@ public void handle(RestxRequestMatch match, RestxRequest req, RestxResponse resp
 
     private static class JsLabelsRoute extends StdRoute {
         private final Messages messages;
+        private final CurrentLocaleResolver currentLocaleResolver;
         private final String labelsJsBefore;
         private final String labelsJsAfter;
 
-        public JsLabelsRoute(Messages messages, String labelsJsTemplate) {
+        public JsLabelsRoute(Messages messages, String labelsJsTemplate, CurrentLocaleResolver currentLocaleResolver) {
             super("labels.js", new StdRestxRequestMatcher("GET", "/i18n/labels.js"));
             this.messages = messages;
+            this.currentLocaleResolver = currentLocaleResolver;
             int i = labelsJsTemplate.indexOf("{LABELS}");
             if (i == -1) {
                 throw new IllegalArgumentException("invalid labels js template. It must have {LABELS} token inside." +
@@ -67,7 +72,7 @@ public JsLabelsRoute(Messages messages, String labelsJsTemplate) {
 
         @Override
         public void handle(RestxRequestMatch match, RestxRequest req, RestxResponse resp, RestxContext ctx) throws IOException {
-            Iterable<Entry<String, String>> entries = messages.entries(req.getLocale());
+            Iterable<Entry<String, String>> entries = messages.entries(currentLocaleResolver.guessLocale(req));
             handleETagFor(req, resp, entries);
 
             resp.setStatus(HttpStatus.OK);