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