HW0 and Optional

Author: bazhukovsi

src/main/java/ru/javawebinar/topjava/util/UserMealsUtil.java

@@ -8,6 +8,7 @@
 import java.time.LocalTime;
 import java.time.Month;
 import java.util.*;
+import java.util.stream.Collectors;
 
 public class UserMealsUtil {
     public static void main(String[] args) {
@@ -23,8 +24,8 @@ public static void main(String[] args) {
 
         List<UserMealWithExcess> mealsTo = filteredByCycles(meals, LocalTime.of(7, 0), LocalTime.of(12, 0), 2000);
         mealsTo.forEach(System.out::println);
-
-//        System.out.println(filteredByStreams(meals, LocalTime.of(7, 0), LocalTime.of(12, 0), 2000));
+        System.out.println("--------------------------------------------");
+        System.out.println(filteredByStreams(meals, LocalTime.of(7, 0), LocalTime.of(12, 0), 2000));
     }
 
     public static List<UserMealWithExcess> filteredByCycles(List<UserMeal> meals, LocalTime startTime, LocalTime endTime, int caloriesPerDay) {
@@ -36,14 +37,22 @@ public static List<UserMealWithExcess> filteredByCycles(List<UserMeal> meals, Lo
         for (UserMeal meal : meals) {
             LocalDateTime dateTime = meal.getDateTime();
             if (TimeUtil.isBetweenHalfOpen(dateTime.toLocalTime(), startTime, endTime)) {
-                userMealWithExcesses.add(new UserMealWithExcess(meal.getDateTime(), meal.getDescription(),
-                        meal.getCalories(), caloriesSumPerDate.get(dateTime.toLocalDate()) > caloriesPerDay));
+                userMealWithExcesses.add(createUserWithExcess(meal,
+                        caloriesSumPerDate.get(meal.getDateTime().toLocalDate()) > caloriesPerDay));
             }
         }
         return userMealWithExcesses;
     }
 
     public static List<UserMealWithExcess> filteredByStreams(List<UserMeal> meals, LocalTime startTime, LocalTime endTime, int caloriesPerDay) {
-        return null;
+        Map<LocalDate, Integer> caloriesSumPerDate = meals.stream().collect(Collectors.groupingBy(meal -> meal.getDateTime().toLocalDate(),
+                Collectors.summingInt(UserMeal::getCalories)));
+        return meals.stream().filter(meal -> TimeUtil.isBetweenHalfOpen(meal.getDateTime().toLocalTime(), startTime, endTime))
+                .map(meal -> createUserWithExcess(meal, caloriesSumPerDate.get(meal.getDateTime().toLocalDate()) > caloriesPerDay))
+                .collect(Collectors.toList());
+    }
+
+    public static UserMealWithExcess createUserWithExcess(UserMeal meal, boolean excess) {
+        return new UserMealWithExcess(meal.getDateTime(), meal.getDescription(), meal.getCalories(), excess);
     }
 }