io.github.seiferma.jameica.hibiscus.dkb.creditcard.util.DateUtils.java Source code

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Here is the source code for io.github.seiferma.jameica.hibiscus.dkb.creditcard.util.DateUtils.java

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/*
Copyright (C) 2016 Stephan Seifermann
    
This program 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 2 of the License, or
(at your option) any later version.
    
This program 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, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package io.github.seiferma.jameica.hibiscus.dkb.creditcard.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import org.apache.commons.lang3.Validate;

public class DateUtils {

    public enum Unit {
        DAY(Calendar.DAY_OF_MONTH), MONTH(Calendar.MONTH), YEAR(Calendar.YEAR);

        private final int calendarField;

        private Unit(int calendarField) {
            this.calendarField = calendarField;
        }

        public int getCalendarField() {
            return calendarField;
        }
    }

    private static final DateFormat DATE_FORMAT = new SimpleDateFormat("dd.MM.yyyy");

    public static Date parseDate(String date) throws ParseException {
        return DATE_FORMAT.parse(date);
    }

    public static String formatDate(Date date) {
        return DATE_FORMAT.format(date);
    }

    public static Date getCurrentDate() {
        return new GregorianCalendar().getTime();
    }

    public static Date getDateAgo(Unit unit, int amount) {
        Validate.inclusiveBetween(0, Integer.MAX_VALUE, amount);

        Calendar calendar = new GregorianCalendar();
        calendar.add(unit.getCalendarField(), -amount);
        return calendar.getTime();
    }
}