Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.time.DayOfWeek;
import java.time.LocalDateTime;
import java.time.temporal.TemporalAdjusters;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class Main {
    public static void main(String[] argv) {
        DayOfWeek d = DayOfWeek.FRIDAY;
        List<DayOfWeek> l = new ArrayList<>();
        l.add(d);

        System.out.println(getNextClosestDateTime(l, 22, 20));
    }

    /**
     * Gets the next or same closest date from the specified days in
     * {@code daysOfWeek List} at specified {@code hour} and {@code min}.
     * 
     * @param daysOfWeek
     *          the days of week
     * @param hour
     *          the hour
     * @param min
     *          the min
     * @return the next or same date from the days of week at specified time
     * @throws IllegalArgumentException
     *           if the {@code daysOfWeek List} is empty.
     */
    public static LocalDateTime getNextClosestDateTime(List<DayOfWeek> daysOfWeek, int hour, int min)
            throws IllegalArgumentException {
        if (daysOfWeek.isEmpty()) {
            throw new IllegalArgumentException("daysOfWeek should not be empty.");
        }

        final LocalDateTime dateNow = LocalDateTime.now();
        final LocalDateTime dateNowWithDifferentTime = dateNow.withHour(hour).withMinute(min).withSecond(0);

        // @formatter:off
        return daysOfWeek.stream().map(d -> dateNowWithDifferentTime.with(TemporalAdjusters.nextOrSame(d)))
                .filter(d -> d.isAfter(dateNow)).min(Comparator.naturalOrder())
                .orElse(dateNowWithDifferentTime.with(TemporalAdjusters.next(daysOfWeek.get(0))));
        // @formatter:on
    }
}

/*
 * Copyright (C) 2004-2015 L2J Server
 * 
 * This file is part of L2J Server.
 * 
 * L2J Server is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * L2J Server is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */