Java TimeZone String Parse safeTimeZone(String s)

Description

safe Time Zone

License

LGPL

Declaration

private static TimeZone safeTimeZone(String s) 

Method Source Code

//package com.java2s;
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1//from   w ww.  j  a  v  a 2  s.c  om
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

import java.util.TimeZone;

public class Main {
    private static TimeZone cachedTimeZone;

    private static TimeZone safeTimeZone(String s) {
        String tzid = tzid(s);
        if (tzid == null)
            return null;

        TimeZone tz = cachedTimeZone;
        if (tz == null || !tz.getID().equals(tzid))
            cachedTimeZone = tz = TimeZone.getTimeZone(tzid);

        return tz;
    }

    private static String tzid(String s) {
        int length = s.length();
        if (length > 4) {
            char[] tzid = { 'G', 'M', 'T', 0, 0, 0, ':', 0, 0 };
            s.getChars(length - 5, length - 2, tzid, 3);
            s.getChars(length - 2, length, tzid, 7);
            if ((tzid[3] == '+' || tzid[3] == '-') && Character.isDigit(tzid[4]) && Character.isDigit(tzid[5])
                    && Character.isDigit(tzid[7]) && Character.isDigit(tzid[8])) {
                return new String(tzid);
            }
        }
        return null;
    }
}

Related

1. parseCal(long time, TimeZone to)
2. parseDA(TimeZone tz, String s)
3. parseTimeZoneId(String timeZoneId)
4. parseTimeZoneString(String timeZoneString)
5. parseTimeZoneString(String timeZoneString)