Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.TemporalQuery;

public class Main {
    public static void main(String[] argv) {
        LocalDate date = LocalDate.parse("2013-01-12");
        TemporalQuery<LocalDate> quarterOfYearQuery = new NextMartinLutherKingDayQuery();

        System.out.println(date.query(quarterOfYearQuery));
    }
}

class NextMartinLutherKingDayQuery implements TemporalQuery<LocalDate> {
    @Override
    public LocalDate queryFrom(TemporalAccessor temporal) {
        LocalDate date = LocalDate.from(temporal);
        LocalDate currentYearMLKDay = getMartinLutherKingDayForDateInYear(date.getYear());

        Period periodToCurrentYearMLKDay = Period.between(date, currentYearMLKDay);

        if (periodToCurrentYearMLKDay.isNegative() || periodToCurrentYearMLKDay.isZero()) {
            return getMartinLutherKingDayForDateInYear(date.getYear() + 1);
        } else {
            return currentYearMLKDay;
        }
    }

    private LocalDate getMartinLutherKingDayForDateInYear(int year) {
        return LocalDate.of(year, Month.JANUARY, 1).with(TemporalAdjusters.dayOfWeekInMonth(3, DayOfWeek.MONDAY));
    }

}