oglimmer/lunchy

package de.oglimmer.lunchy.services;

import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class DateCalcService {

    private DateCalcService() {
    }

    public static Calendar findNever() {
        Calendar cal = GregorianCalendar.getInstance();
        cal.set(2038, 0, 19, 0, 0, 0);// largest date in mysql 2038-01-19
        return cal;
    }

    public static Calendar findNextMonday() {
        Calendar cal = GregorianCalendar.getInstance();

        cal.set(Calendar.HOUR_OF_DAY, 7);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

        cal.add(Calendar.DAY_OF_YEAR, 7);

        return cal;
    }

    public static Timestamp getOneWeekAgo() {
        Calendar cal = GregorianCalendar.getInstance();
        cal.add(Calendar.DAY_OF_YEAR, -7);
        return new Timestamp(cal.getTime().getTime());
    }

    public static Timestamp getNever() {
        return new Timestamp(findNever().getTime().getTime());
    }

    public static Timestamp getNextMonday() {
        return new Timestamp(findNextMonday().getTime().getTime());
    }

    public static boolean youngerThan(Date date, int field, int units) {
        Calendar now = GregorianCalendar.getInstance();
        Calendar cal = GregorianCalendar.getInstance();
        cal.setTime(date);
        cal.add(field, units);
        return now.before(cal);
    }

    public static Timestamp getNow() {
        return new Timestamp(new Date().getTime());
    }
}