edu.htl3r.schoolplanner.DateTimeUtils.java Source code

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Here is the source code for edu.htl3r.schoolplanner.DateTimeUtils.java

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/* SchoolPlanner4Untis - Android app to manage your Untis timetable
Copyright (C) 2011  Mathias Kub <mail@makubi.at>
     Sebastian Chlan <sebastian@schoolplanner.at>
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 3 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, see <http://www.gnu.org/licenses/>.
*/
package edu.htl3r.schoolplanner;

import java.util.Calendar;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.http.ParseException;

import android.content.Context;
import android.text.format.Time;

public class DateTimeUtils {

    private static Context context = SchoolplannerContext.context;

    public static String[] SHORT_WEEKDAY_NAMES = new String[] {
            getString(R.string.timetable_week_header_sunday_short),
            getString(R.string.timetable_week_header_monday_short),
            getString(R.string.timetable_week_header_tuesday_short),
            getString(R.string.timetable_week_header_wednesday_short),
            getString(R.string.timetable_week_header_thursday_short),
            getString(R.string.timetable_week_header_friday_short),
            getString(R.string.timetable_week_header_saturday_short) };

    public static String[] MONTH_NAMES = new String[] { getString(R.string.month_name_january),
            getString(R.string.month_name_february), getString(R.string.month_name_march),
            getString(R.string.month_name_april), getString(R.string.month_name_may),
            getString(R.string.month_name_june), getString(R.string.month_name_july),
            getString(R.string.month_name_august), getString(R.string.month_name_september),
            getString(R.string.month_name_october), getString(R.string.month_name_november),
            getString(R.string.month_name_december) };

    /**
     * Liefert ein {@link Time}-Objekt als ISO-8601-String (Form: YYYY-MM-DD).
     * @param date {@link Time}-Objekt, von dem der String erzeugt werden soll
     * @return Uebergebenes {@link Time}-Objekt als ISO-8601-String
     */
    public static String toISO8601Date(Time date) {
        String month = normalizeDate("" + date.month);
        String day = normalizeDate("" + (date.monthDay + 1));

        return date.year + "-" + month + "-" + day;
    }

    /**
     * Liefert ein {@link DateTime}-Objekt als ISO-8601-String (Form: YYYY-MM-DD).
     * @param date {@link DateTime}-Objekt, von dem der String erzeugt werden soll
     * @return Uebergebenes {@link DateTime}-Objekt als ISO-8601-String
     */
    public static String toISO8601Date(DateTime date) {
        String month = normalizeDate("" + date.getMonth());
        String day = normalizeDate("" + (date.getDay()));

        return date.getYear() + "-" + month + "-" + day;
    }

    /**
     * Wandelt einen {@link #toISO8601Date(DateTime)}-String in ein DateTime-Objekt um.
     * @param dateString String, der umgewandelt werden soll
     * @return Das initialisierte {@link DateTime}-Objekt
     * @throws ParseException Falls der String nicht geparst werden kann
     */
    public static DateTime iso8601StringToDateTime(String dateString) throws ParseException {
        Pattern p = Pattern.compile("^([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})$");
        Matcher m = p.matcher(dateString);
        if (m.matches()) {
            DateTime dateTime = new DateTime();
            dateTime.set(Integer.parseInt(m.group(3)), Integer.parseInt(m.group(2)), Integer.parseInt(m.group(1)));
            return dateTime;
        }
        throw new ParseException("Unable to parse String " + dateString + " to date.");
    }

    private static String normalizeDate(String datePart) {
        return datePart.length() < 2 ? "0" + datePart : datePart;
    }

    public static Time toTime(DateTime dateTime) {
        Time time = new Time();
        time.set(dateTime.getSecond(), dateTime.getMinute(), dateTime.getHour(), dateTime.getDay(),
                dateTime.getMonth() - 1, dateTime.getYear());
        return time;
    }

    public static DateTime toDateTime(Calendar calendar) {
        DateTime dateTime = new DateTime();
        dateTime.set(calendar.get(Calendar.MINUTE), calendar.get(Calendar.HOUR_OF_DAY),
                calendar.get(Calendar.DAY_OF_MONTH), calendar.get(Calendar.MONTH) + 1, calendar.get(Calendar.YEAR));
        return dateTime;
    }

    public static String getMonthName(DateTime dateTime) {
        return MONTH_NAMES[dateTime.getMonth() - 1];
    }

    public static String getShortWeekDayName(DateTime dateTime) {
        return SHORT_WEEKDAY_NAMES[dateTime.getWeekDay()];
    }

    private static String getString(int resId) {
        return context.getString(resId);
    }

    public static DateTime getNow() {
        DateTime now = new DateTime();
        now.getAndroidTime().setToNow();
        return now;
    }
}