Java Date Time - LocalDateTime.query() Examples

package com.logicbig.example.localdatetime;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneOffset;
import java.time.chrono.Chronology;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalUnit;

public class QueryExample {

    public static void main (String... args) {
        LocalDateTime dt = LocalDateTime.of(2016, 1, 1,
                                            22, 20);
        LocalDate d = dt.query(TemporalQueries.localDate());
        System.out.println(d);

        LocalTime t = dt.query(TemporalQueries.localTime());
        System.out.println(t);

        TemporalUnit u = dt.query(TemporalQueries.precision());
        System.out.println(u);

        Chronology c = dt.query(TemporalQueries.chronology());
        System.out.println(c);

        ZoneOffset z = dt.query(TemporalQueries.offset());
        System.out.println(z);
    }
}

package com.logicbig.example.localdatetime;

import java.time.*;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.TemporalQuery;

public class QueryExample2 {

    public static void main (String... args) {
        LocalDateTime dt = LocalDateTime.of(2017, 1, 16,
                                            14, 20);
        Boolean b = dt.query(StockMarketQuery);
        System.out.printf("Stock market is open at %s: %s%n",
                          dt, b);

        dt = LocalDateTime.of(2017, 1, 20,
                              14, 17);
        b = dt.query(StockMarketQuery);
        System.out.printf("Stock market is open at %s: %s%n",
                          dt, b);


    }

    private static final TemporalQuery<Boolean> StockMarketQuery =
                                           new TemporalQuery<Boolean>() {
        @Override
        public Boolean queryFrom (TemporalAccessor temporal) {
            System.out.println("holiday: " + isHoliday(temporal));
            return !isHoliday(temporal)
                      && withinWorkingHours(temporal);
        }

        private boolean withinWorkingHours (TemporalAccessor temporal) {
            LocalTime localTime = LocalTime.from(temporal);
            LocalTime open = LocalTime.of(9, 30);
            LocalTime close = LocalTime.of(16, 0);
            return localTime.compareTo(open) >= 0
                      && localTime.compareTo(close) < 0;
        }

        private boolean isHoliday (TemporalAccessor temporal) {
            LocalDate d = LocalDate.from(temporal);

            return (d.getDayOfMonth() == 1
                      && d.getMonth() == Month.JANUARY)//new year
                      ||
                      (d.getMonth() == Month.JANUARY &&
                      d.with(TemporalAdjusters.dayOfWeekInMonth(
                                3, DayOfWeek.MONDAY))
                       .getDayOfMonth() == d.getDayOfMonth())//Martin luther day
                      //todo add more including weekends
                      ;
        }
    };
}