#55 added nav controller

src/main/java/ru/ulstu/conference/controller/ConferenceController.java

@@ -18,6 +18,11 @@ import java.io.IOException;
 import java.util.stream.Collectors;
 
 import static org.springframework.util.StringUtils.isEmpty;
+import static ru.ulstu.conference.controller.NavigationController.CONFERENCES_PAGE;
+import static ru.ulstu.conference.controller.NavigationController.CONFERENCE_PAGE;
+import static ru.ulstu.conference.controller.NavigationController.REDIRECT_TO;
+import static ru.ulstu.grant.controller.Navigation.hasErrors;
+
 
 @Controller()
 @RequestMapping(value = "/conferences")
@@ -51,11 +56,9 @@ public class ConferenceController {
         if (conferenceDto.getDeadlines().isEmpty()) {
             errors.rejectValue("deadlines", "errorCode", "Не может быть пустым");
         }
-        if (errors.hasErrors()) {
-            return "/conferences/conference";
-        }
+        hasErrors(errors, CONFERENCE_PAGE);
         conferenceService.save(conferenceDto);
-        return "redirect:/conferences/conferences";
+        return String.format(REDIRECT_TO, CONFERENCES_PAGE);
 
     }
 

src/main/java/ru/ulstu/conference/controller/NavigationController.java

@@ -0,0 +1,18 @@
+package ru.ulstu.conference.controller;
+
+import org.springframework.validation.Errors;
+
+public class NavigationController {
+
+    public static final String REDIRECT_TO = "redirect:%s";
+    public static final String CONFERENCES_PAGE = "/conferences/conferences";
+    public static final String CONFERENCE_PAGE = "/conferences/conference";
+
+    public static String hasErrors(Errors errors, String page) {
+        if (errors.hasErrors()) {
+            return page;
+        }
+        return null;
+    }
+
+}