fix scheduler code to use service

src/main/java/ru/ulstu/paper/service/DeadlineScheduler.java

@@ -4,28 +4,26 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
+import ru.ulstu.core.util.DateUtils;
 import ru.ulstu.paper.model.Paper;
-import ru.ulstu.paper.repository.PaperRepository;
 import ru.ulstu.user.model.User;
-import ru.ulstu.user.scheduler.UserScheduler;
 import ru.ulstu.user.service.MailService;
 
-import java.util.Calendar;
-import java.util.List;
+import java.util.Date;
 
 @Service
 public class DeadlineScheduler {
+    private final static boolean IS_DEADLINE_NOTIFICATION_BEFORE_WEEK = true;
+    private final static int DAYS_TO_DEADLINE_NOTIFICATION = 7;
 
     private final Logger log = LoggerFactory.getLogger(DeadlineScheduler.class);
 
-    private final PaperRepository paperRepository;
+    private final PaperService paperService;
 
     private final MailService mailService;
 
-    private final static boolean IS_DEADLINE_NOTIFICATION_BEFORE_WEEK = true;
-
-    public DeadlineScheduler(PaperRepository paperRepository, MailService mailService) {
-        this.paperRepository = paperRepository;
+    public DeadlineScheduler(PaperService paperService, MailService mailService) {
+        this.paperService = paperService;
         this.mailService = mailService;
     }
 
@@ -45,21 +43,25 @@ public class DeadlineScheduler {
     }
 
     private void sendNotifications(boolean isDeadlineBeforeWeek) {
-        List<Paper> allPapers = paperRepository.findAll();
-        for (Paper paper : allPapers) {
-            Calendar c = Calendar.getInstance();
-            c.add(Calendar.DAY_OF_YEAR, 7);
-            if (((c.getTime().compareTo(paper.getDeadlineDate()) < 0) && isDeadlineBeforeWeek) ||
-                    (c.getTime().compareTo(paper.getDeadlineDate()) >= 0) && !isDeadlineBeforeWeek) {
-                sendMessageDeadline(paper);
-            }
-        }
+        Date now = DateUtils.addDays(new Date(), DAYS_TO_DEADLINE_NOTIFICATION);
+        paperService
+                .findAll()
+                .stream()
+                .filter(paper -> needToSendDeadlineNotification(paper, now, isDeadlineBeforeWeek))
+                .map(paper -> sendMessageDeadline(paper));
+    }
+
+    private boolean needToSendDeadlineNotification(Paper paper, Date compareDate, boolean isDeadlineBeforeWeek) {
+        return paper.getDeadlineDate() != null
+                && (compareDate.before(paper.getDeadlineDate()) && isDeadlineBeforeWeek
+                || compareDate.after(paper.getDeadlineDate()) && !isDeadlineBeforeWeek);
     }
 
-    private void sendMessageDeadline(Paper paper){
+    private Paper sendMessageDeadline(Paper paper) {
         for (User user : paper.getAuthors()) {
             mailService.sendEmail(user.getEmail(), "Приближается срок сдачи статьи",
                     "Срок сдачи статьи " + paper.getTitle() + " " + paper.getDeadlineDate().toString());
         }
+        return paper;
     }
 }