Java Calendar Create getCalendar(final String isodate)

Description

get Calendar

License

Open Source License

Declaration

private static Calendar getCalendar(final String isodate) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.Calendar;

import java.util.GregorianCalendar;
import java.util.StringTokenizer;
import java.util.TimeZone;

public class Main {
    private static Calendar getCalendar(final String isodate) throws Exception {
        // YYYY-MM-DDThh:mm:ss.sTZD
        final StringTokenizer st = new StringTokenizer(isodate, "-T:.+Z", true);

        final Calendar calendar = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
        calendar.clear();//  www.  ja  v a 2  s .  co m
        try {
            // Year
            if (st.hasMoreTokens()) {
                final int year = Integer.parseInt(st.nextToken());
                calendar.set(Calendar.YEAR, year);
            } else {
                return calendar;
            }
            // Month
            if (check(st, "-") && (st.hasMoreTokens())) {
                final int month = Integer.parseInt(st.nextToken()) - 1;
                calendar.set(Calendar.MONTH, month);
            } else {
                return calendar;
            }
            // Day
            if (check(st, "-") && (st.hasMoreTokens())) {
                final int day = Integer.parseInt(st.nextToken());
                calendar.set(Calendar.DAY_OF_MONTH, day);
            } else {
                return calendar;
            }
            // Hour
            if (check(st, "T") && (st.hasMoreTokens())) {
                final int hour = Integer.parseInt(st.nextToken());
                calendar.set(Calendar.HOUR_OF_DAY, hour);
            } else {
                calendar.set(Calendar.HOUR_OF_DAY, 0);
                calendar.set(Calendar.MINUTE, 0);
                calendar.set(Calendar.SECOND, 0);
                calendar.set(Calendar.MILLISECOND, 0);
                return calendar;
            }
            // Minutes
            if (check(st, ":") && (st.hasMoreTokens())) {
                final int minutes = Integer.parseInt(st.nextToken());
                calendar.set(Calendar.MINUTE, minutes);
            } else {
                calendar.set(Calendar.MINUTE, 0);
                calendar.set(Calendar.SECOND, 0);
                calendar.set(Calendar.MILLISECOND, 0);
                return calendar;
            }

            //
            // Not mandatory now
            //

            // Secondes
            if (!st.hasMoreTokens()) {
                return calendar;
            }
            String tok = st.nextToken();
            if (tok.equals(":")) { // secondes
                if (st.hasMoreTokens()) {
                    final int secondes = Integer.parseInt(st.nextToken());
                    calendar.set(Calendar.SECOND, secondes);
                    if (!st.hasMoreTokens()) {
                        return calendar;
                    }
                    // frac sec
                    tok = st.nextToken();
                    if (tok.equals(".")) {
                        // bug fixed, thx to Martin Bottcher
                        String nt = st.nextToken();
                        while (nt.length() < 3) {
                            nt += "0";
                        }
                        nt = nt.substring(0, 3); // Cut trailing chars..
                        final int millisec = Integer.parseInt(nt);
                        // int millisec = Integer.parseInt(st.nextToken()) * 10;
                        calendar.set(Calendar.MILLISECOND, millisec);
                        if (!st.hasMoreTokens()) {
                            return calendar;
                        }
                        tok = st.nextToken();
                    } else {
                        calendar.set(Calendar.MILLISECOND, 0);
                    }
                } else {
                    throw new Exception("No secondes specified");
                }
            } else {
                calendar.set(Calendar.SECOND, 0);
                calendar.set(Calendar.MILLISECOND, 0);
            }
            // Timezone
            if (!tok.equals("Z")) { // UTC
                if (!(tok.equals("+") || tok.equals("-"))) {
                    throw new Exception("only Z, + or - allowed");
                }
                final boolean plus = tok.equals("+");
                if (!st.hasMoreTokens()) {
                    throw new Exception("Missing hour field");
                }
                final int tzhour = Integer.parseInt(st.nextToken());
                int tzmin = 0;
                if (check(st, ":") && (st.hasMoreTokens())) {
                    tzmin = Integer.parseInt(st.nextToken());
                } else {
                    throw new Exception("Missing minute field");
                }
                if (plus) {
                    calendar.add(Calendar.HOUR, -tzhour);
                    calendar.add(Calendar.MINUTE, -tzmin);
                } else {
                    calendar.add(Calendar.HOUR, tzhour);
                    calendar.add(Calendar.MINUTE, tzmin);
                }
            }
        } catch (final NumberFormatException ex) {
            ex.printStackTrace();
        }
        return calendar;
    }

    private static boolean check(final StringTokenizer st, final String token) throws Exception {
        try {
            if (st.nextToken().equals(token)) {
                return true;
            } else {
                throw new Exception("Missing [" + token + "]");
            }
        } catch (final Exception ex) {
            return false;
        }
    }
}

Related

1. getCalendar(boolean skipConversion)
2. getCalendar(boolean skipConversion)
3. getCalendar(Calendar cal, int relativeDay)
4. getCalendar(final Date dateAndTime)
5. getCalendar(final long timeInMillis)
6. getCalendar(int d, int m, int y)
7. getCalendar(int dayOfWeek, int atHour, int atMinute)
8. getCalendar(int year, int month, int date)
9. getCalendar(int year, int month, int day)