// 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
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// 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"};
// find out time zone and DST offset
private static Calendar thisCalendar = GregorianCalendar.getInstance();
//private static long zoneOffsetHours = thisCalendar.get(Calendar.ZONE_OFFSET);
//private static long DSTOffsetHours = thisCalendar.get(Calendar.DST_OFFSET);
//private static long offsetHours = zoneOffsetHours + DSTOffsetHours; // this must be subtracted from current Date().getTime() to produce a GMT Time
// 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 static String UTCDiffString() {
// we express the UTC Difference in 5 digits:
// SHHMM
// S ::= '+'|'-'
// HH ::= '00'|'01'|'02'|'03'|'04'|'05'|'06'|'07'|'08'|'09'|'10'|'11'|'12'
// MM ::= '00'|'15'|'30'|'45'
// since there are some places on earth where there is a time shift of half an hour
// we need too show also the minutes of the time shift
// Examples: http://www.timeanddate.com/library/abbreviations/timezones/
long offsetHours = UTCDiff();
int om = Math.abs((int) (offsetHours / minuteMillis)) % 60;
int oh = Math.abs((int) (offsetHours / hourMillis));
String diff = Integer.toString(om);
if (diff.length() < 2) diff = "0" + diff;
diff = Integer.toString(oh) + diff;
if (diff.length() < 4) diff = "0" + diff;
if (offsetHours >= 0) {
return "+" + diff;
} else {
return "-" + diff;
}
}
public static long UTCDiff() {
long zoneOffsetHours = thisCalendar.get(Calendar.ZONE_OFFSET);
long DSTOffsetHours = thisCalendar.get(Calendar.DST_OFFSET);
return zoneOffsetHours + DSTOffsetHours;
}
public static long UTCDiff(String diffString) {
if (diffString.length() != 5) throw new RuntimeException("UTC String malformed (wrong size):" + diffString);
boolean ahead = true;
if (diffString.charAt(0) == '+') ahead = true;
else if (diffString.charAt(0) == '-') ahead = false;
else throw new RuntimeException("UTC String malformed (wrong sign):" + diffString);
long oh = Long.parseLong(diffString.substring(1, 3));
long om = Long.parseLong(diffString.substring(3));
return ((ahead) ? (long) 1 : (long) -1) * (oh * hourMillis + om * minuteMillis);
}
/*
public static Date UTC0Date() {
return new Date(UTC0Time());
}
*/
public static long correctedUTCTime() {
return System.currentTimeMillis() - UTCDiff();
}
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);
}
// 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 String intervalToString(long millis) {
try {
long mins = millis / 60000;
StringBuffer uptime = new StringBuffer();
int uptimeDays = (int) (Math.floor(mins/1440));
int uptimeHours = (int) (Math.floor(mins/60)%24);
int uptimeMins = (int) mins%60;
uptime.append(uptimeDays)
.append(((uptimeDays == 1)?" day ":" days "))
.append((uptimeHours < 10)?"0":"")
.append(uptimeHours)
.append(":")
.append((uptimeMins < 10)?"0":"")
.append(uptimeMins);
return uptime.toString();
} catch (Exception e) {
return "unknown";
}
}
public static void main(String[] args) {
//System.out.println("kelondroDate is (" + new kelondroDate().toString() + ")");
System.out.println("offset is " + (UTCDiff()/1000/60/60) + " hours, javaDate is " + new Date() + ", correctedDate is " + new Date(correctedUTCTime()));
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");
}
}