UserMealsUtil.java

package ru.javawebinar.topjava.util;

import ru.javawebinar.topjava.model.UserMeal;
import ru.javawebinar.topjava.to.UserMealWithExceed;

import java.time.LocalDate;
import java.time.LocalTime;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * GKislin
 * 31.05.2015.
 */
public class UserMealsUtil {

    public static List<UserMealWithExceed> getFilteredMealsWithExceeded(List<UserMeal> mealList, LocalTime startTime, LocalTime endTime, int caloriesPerDay) {
        Map<LocalDate, Integer> caloriesSumByDate = mealList.stream().collect(Collectors.groupingBy(um -> um.getDateTime().toLocalDate(),
                Collectors.summingInt(UserMeal::getCalories)));

        return mealList.stream()
                .filter(um->TimeUtil.isBetween(um.getDateTime().toLocalTime(), startTime, endTime))
                .map(um->new UserMealWithExceed(um.getId(), um.getDateTime(), um.getDescription(), um.getCalories(),
                        caloriesSumByDate.get(um.getDateTime().toLocalDate())> caloriesPerDay))
                .collect(Collectors.toList());
    }
}