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287 lines
15 KiB
287 lines
15 KiB
// serverDate.java
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// -------------------------------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// last major change: 14.03.2005
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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// this class is needed to replace the slow java built-in date method by a faster version
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package de.anomic.server;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.Locale;
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import java.util.TimeZone;
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public final class serverDate {
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// statics
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private final static long secondMillis = 1000;
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private final static long minuteMillis = 60 * secondMillis;
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private final static long hourMillis = 60 * minuteMillis;
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private final static long dayMillis = 24 * hourMillis;
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private final static long normalyearMillis = 365 * dayMillis;
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private final static long leapyearMillis = 366 * dayMillis;
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private final static int january = 31, normalfebruary = 28, leapfebruary = 29, march = 31,
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april = 30, may = 31, june = 30, july = 31, august = 31,
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september = 30, october = 31, november = 30, december = 31;
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private final static int[] dimnormal = {january, normalfebruary, march, april, may, june, july, august, september, october, november, december};
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private final static int[] dimleap = {january, leapfebruary, march, april, may, june, july, august, september, october, november, december};
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private final static String[] wkday = {"Mon","Tue","Wed","Thu","Fri","Sat","Sun"};
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private final static String[] month = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
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// find out time zone and DST offset
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private static Calendar thisCalendar = GregorianCalendar.getInstance();
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private static long zoneOffsetHours = thisCalendar.get(Calendar.ZONE_OFFSET);
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private static long DSTOffsetHours = thisCalendar.get(Calendar.DST_OFFSET);
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private static long offsetHours = zoneOffsetHours + DSTOffsetHours; // this must be subtracted from current Date().getTime() to produce a GMT Time
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// pre-calculation of time tables
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private final static long[] dimnormalacc, dimleapacc;
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private static long[] utimeyearsacc;
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static {
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long millis = 0;
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utimeyearsacc = new long[67];
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for (int i = 0; i < 67; i++) {
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utimeyearsacc[i] = millis;
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millis += ((i & 3) == 0) ? leapyearMillis : normalyearMillis;
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}
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millis = 0;
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dimnormalacc = new long[12];
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for (int i = 0; i < 12; i++) {
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dimnormalacc[i] = millis;
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millis += (dayMillis * dimnormal[i]);
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}
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millis = 0;
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dimleapacc = new long[12];
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for (int i = 0; i < 12; i++) {
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dimleapacc[i] = millis;
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millis += (dayMillis * dimleap[i]);
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}
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}
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// class variables
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private int milliseconds, seconds, minutes, hours, days, months, years; // years since 1970
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private int dow; // day-of-week
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private long utime;
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public static Date correctedGMTDate() {
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return new Date(System.currentTimeMillis() - offsetHours);
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}
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public serverDate() {
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this(System.currentTimeMillis());
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}
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public serverDate(long utime) {
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// set the time as the difference, measured in milliseconds,
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// between the current time and midnight, January 1, 1970 UTC/GMT
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this.utime = utime;
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dow = (int) (((utime / dayMillis) + 3) % 7);
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years = (int) (utime / normalyearMillis); // a guess
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if (utime < utimeyearsacc[years]) years--; // the correction
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long remain = utime - utimeyearsacc[years];
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months = (int) (remain / (29 * dayMillis)); // a guess
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if ((years & 3) == 0) {
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if (remain < dimleapacc[months]) months--; // correction
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remain = remain - dimleapacc[months];
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} else {
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if (remain < dimnormalacc[months]) months--; // correction
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remain = remain - dimnormalacc[months];
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}
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days = (int) (remain / dayMillis); remain = remain % dayMillis;
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hours = (int) (remain / hourMillis); remain = remain % hourMillis;
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minutes = (int) (remain / minuteMillis); remain = remain % minuteMillis;
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seconds = (int) (remain / secondMillis); remain = remain % secondMillis;
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milliseconds = (int) remain;
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}
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private void calcUTime() {
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this.utime = utimeyearsacc[years] + dimleapacc[months - 1] + dayMillis * (days - 1) +
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hourMillis * hours + minuteMillis * minutes + secondMillis * seconds + milliseconds;
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this.dow = (int) (((utime / dayMillis) + 3) % 7);
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}
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public serverDate(String datestring) throws java.text.ParseException {
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// parse a date string; othervise throw a java.text.ParseException
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if ((datestring.length() == 14) || (datestring.length() == 17)) {
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// parse a ShortString
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try {years = Integer.parseInt(datestring.substring(0, 4)) - 1970;} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong year", 0);
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}
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if (years < 0) throw new java.text.ParseException("serverDate '" + datestring + "' wrong year", 0);
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try {months = Integer.parseInt(datestring.substring(4, 6)) - 1;} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong month", 4);
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}
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if ((months < 0) || (months > 11)) throw new java.text.ParseException("serverDate '" + datestring + "' wrong month", 4);
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try {days = Integer.parseInt(datestring.substring(6, 8)) - 1;} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong day", 6);
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}
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if ((days < 0) || (days > 30)) throw new java.text.ParseException("serverDate '" + datestring + "' wrong day", 6);
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try {hours = Integer.parseInt(datestring.substring(8, 10));} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong hour", 8);
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}
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if ((hours < 0) || (hours > 23)) throw new java.text.ParseException("serverDate '" + datestring + "' wrong hour", 8);
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try {minutes = Integer.parseInt(datestring.substring(10, 12));} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong minute", 10);
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}
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if ((minutes < 0) || (minutes > 59)) throw new java.text.ParseException("serverDate '" + datestring + "' wrong minute", 10);
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try {seconds = Integer.parseInt(datestring.substring(12, 14));} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong second", 12);
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}
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if ((seconds < 0) || (seconds > 59)) throw new java.text.ParseException("serverDate '" + datestring + "' wrong second", 12);
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if (datestring.length() == 17) {
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try {milliseconds = Integer.parseInt(datestring.substring(14, 17));} catch (NumberFormatException e) {
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throw new java.text.ParseException("serverDate '" + datestring + "' wrong millisecond", 14);
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}
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} else {
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milliseconds = 0;
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}
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if ((milliseconds < 0) || (milliseconds > 999)) throw new java.text.ParseException("serverDate '" + datestring + "' wrong millisecond", 14);
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calcUTime();
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return;
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}
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throw new java.text.ParseException("serverDate '" + datestring + "' format unknown", 0);
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}
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public String toString() {
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return "utime=" + utime + ", year=" + (years + 1970) +
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", month=" + (months + 1) + ", day=" + (days + 1) +
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", hour=" + hours + ", minute=" + minutes +
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", second=" + seconds + ", millis=" + milliseconds +
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", day-of-week=" + wkday[dow];
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}
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public String toShortString(boolean millis) {
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// returns a "yyyyMMddHHmmssSSS"
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byte[] result = new byte[(millis) ? 17 : 14];
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int x = 1970 + years;
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result[ 0] = (byte) (48 + (x / 1000)); x = x % 1000;
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result[ 1] = (byte) (48 + (x / 100)); x = x % 100;
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result[ 2] = (byte) (48 + (x / 10)); x = x % 10;
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result[ 3] = (byte) (48 + x);
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x = months + 1;
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result[ 4] = (byte) (48 + (x / 10));
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result[ 5] = (byte) (48 + (x % 10));
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x = days + 1;
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result[ 6] = (byte) (48 + (x / 10));
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result[ 7] = (byte) (48 + (x % 10));
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result[ 8] = (byte) (48 + (hours / 10));
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result[ 9] = (byte) (48 + (hours % 10));
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result[10] = (byte) (48 + (minutes / 10));
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result[11] = (byte) (48 + (minutes % 10));
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result[12] = (byte) (48 + (seconds / 10));
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result[13] = (byte) (48 + (seconds % 10));
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if (millis) {
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x = milliseconds;
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result[14] = (byte) (48 + (x / 100)); x = x % 100;
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result[15] = (byte) (48 + (x / 10)); x = x % 10;
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result[16] = (byte) (48 + x);
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}
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return new String(result);
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}
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// the following is only here to compare the kelondroDate with java-Date:
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private static TimeZone GMTTimeZone = TimeZone.getTimeZone("GMT");
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private static Calendar gregorian = new GregorianCalendar(GMTTimeZone);
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private static SimpleDateFormat testSFormatter = new SimpleDateFormat("yyyyMMddHHmmss");
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private static SimpleDateFormat testLFormatter = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US);
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public static String testSDateShortString() {
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return testSFormatter.format(gregorian.getTime());
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}
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public static String intervalToString(long millis) {
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try {
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long mins = millis / 60000;
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StringBuffer uptime = new StringBuffer();
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int uptimeDays = (int) (Math.floor(mins/1440));
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int uptimeHours = (int) (Math.floor(mins/60)%24);
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int uptimeMins = (int) mins%60;
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uptime.append(uptimeDays)
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.append(((uptimeDays == 1)?" day ":" days "))
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.append((uptimeHours < 10)?"0":"")
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.append(uptimeHours)
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.append(":")
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.append((uptimeMins < 10)?"0":"")
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.append(uptimeMins);
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return uptime.toString();
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} catch (Exception e) {
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return "unknown";
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}
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}
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public static void main(String[] args) {
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//System.out.println("kelondroDate is (" + new kelondroDate().toString() + ")");
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System.out.println("offset is " + (offsetHours/1000/60/60/24) + " hours, javaDate is " + new Date() + ", correctedDate is " + correctedGMTDate());
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System.out.println("serverDate : " + new serverDate().toShortString(false));
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System.out.println(" javaDate : " + testSDateShortString());
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System.out.println("serverDate : " + new serverDate().toString());
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System.out.println(" JavaDate : " + testLFormatter.format(new Date()));
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System.out.println("serverDate0: " + new serverDate(0).toShortString(false));
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System.out.println(" JavaDate0: " + testSFormatter.format(new Date(0)));
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System.out.println("serverDate0: " + new serverDate(0).toString());
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System.out.println(" JavaDate0: " + testLFormatter.format(new Date(0)));
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// parse test
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try {
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System.out.println("serverDate re-parse short: " + new serverDate(new serverDate().toShortString(false)).toShortString(true));
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System.out.println("serverDate re-parse long : " + new serverDate(new serverDate().toShortString(true)).toShortString(true));
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} catch (java.text.ParseException e) {
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System.out.println("Parse Exception: " + e.getMessage() + ", pos " + e.getErrorOffset());
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}
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String testresult;
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int cycles = 10000;
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long start;
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start = System.currentTimeMillis();
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for (int i = 0; i < cycles; i++) testresult = new serverDate().toShortString(false);
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System.out.println("time for " + cycles + " calls to serverDate:" + (System.currentTimeMillis() - start) + " milliseconds");
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start = System.currentTimeMillis();
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for (int i = 0; i < cycles; i++) testresult = testSDateShortString();
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System.out.println("time for " + cycles + " calls to javaDate:" + (System.currentTimeMillis() - start) + " milliseconds");
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}
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}
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