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Smack/smack-core/src/main/java/org/jivesoftware/smack/util/XmppDateTime.java

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/**
*
* Copyright the original author or authors
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.util;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class XmppDateTime {
private static final DateFormatType dateFormatter = DateFormatType.XEP_0082_DATE_PROFILE;
private static final Pattern datePattern = Pattern.compile("^\\d+-\\d+-\\d+$");
private static final DateFormatType timeFormatter = DateFormatType.XEP_0082_TIME_MILLIS_ZONE_PROFILE;
private static final Pattern timePattern = Pattern.compile("^(\\d+:){2}\\d+.\\d+(Z|([+-](\\d+:\\d+)))$");
private static final DateFormatType timeNoZoneFormatter = DateFormatType.XEP_0082_TIME_MILLIS_PROFILE;
private static final Pattern timeNoZonePattern = Pattern.compile("^(\\d+:){2}\\d+.\\d+$");
private static final DateFormatType timeNoMillisFormatter = DateFormatType.XEP_0082_TIME_ZONE_PROFILE;
private static final Pattern timeNoMillisPattern = Pattern.compile("^(\\d+:){2}\\d+(Z|([+-](\\d+:\\d+)))$");
private static final DateFormatType timeNoMillisNoZoneFormatter = DateFormatType.XEP_0082_TIME_PROFILE;
private static final Pattern timeNoMillisNoZonePattern = Pattern.compile("^(\\d+:){2}\\d+$");
private static final DateFormatType dateTimeFormatter = DateFormatType.XEP_0082_DATETIME_MILLIS_PROFILE;
private static final Pattern dateTimePattern = Pattern.compile("^\\d+(-\\d+){2}+T(\\d+:){2}\\d+.\\d+(Z|([+-](\\d+:\\d+)))?$");
private static final DateFormatType dateTimeNoMillisFormatter = DateFormatType.XEP_0082_DATETIME_PROFILE;
private static final Pattern dateTimeNoMillisPattern = Pattern.compile("^\\d+(-\\d+){2}+T(\\d+:){2}\\d+(Z|([+-](\\d+:\\d+)))?$");
private static final DateFormat xep0091Formatter = new SimpleDateFormat("yyyyMMdd'T'HH:mm:ss");
private static final DateFormat xep0091Date6DigitFormatter = new SimpleDateFormat(
"yyyyMd'T'HH:mm:ss");
private static final DateFormat xep0091Date7Digit1MonthFormatter = new SimpleDateFormat(
"yyyyMdd'T'HH:mm:ss");
private static final DateFormat xep0091Date7Digit2MonthFormatter = new SimpleDateFormat(
"yyyyMMd'T'HH:mm:ss");
private static final Pattern xep0091Pattern = Pattern.compile("^\\d+T\\d+:\\d+:\\d+$");
public static enum DateFormatType {
// @formatter:off
XEP_0082_DATE_PROFILE("yyyy-MM-dd"),
XEP_0082_DATETIME_PROFILE("yyyy-MM-dd'T'HH:mm:ssZ"),
XEP_0082_DATETIME_MILLIS_PROFILE("yyyy-MM-dd'T'HH:mm:ss.SSSZ"),
XEP_0082_TIME_PROFILE("hh:mm:ss"),
XEP_0082_TIME_ZONE_PROFILE("hh:mm:ssZ"),
XEP_0082_TIME_MILLIS_PROFILE("hh:mm:ss.SSS"),
XEP_0082_TIME_MILLIS_ZONE_PROFILE("hh:mm:ss.SSSZ"),
XEP_0091_DATETIME("yyyyMMdd'T'HH:mm:ss");
// @formatter:on
private final String FORMAT_STRING;
private final DateFormat FORMATTER;
private final boolean CONVERT_TIMEZONE;
private DateFormatType(String dateFormat) {
FORMAT_STRING = dateFormat;
FORMATTER = new SimpleDateFormat(FORMAT_STRING);
FORMATTER.setTimeZone(TimeZone.getTimeZone("UTC"));
CONVERT_TIMEZONE = dateFormat.charAt(dateFormat.length() - 1) == 'Z';
}
public String format(Date date) {
String res;
synchronized(FORMATTER) {
res = FORMATTER.format(date);
}
if (CONVERT_TIMEZONE) {
res = convertRfc822TimezoneToXep82(res);
}
return res;
}
public Date parse(String dateString) throws ParseException {
if (CONVERT_TIMEZONE) {
dateString = convertXep82TimezoneToRfc822(dateString);
}
synchronized(FORMATTER) {
return FORMATTER.parse(dateString);
}
}
}
private static final List<PatternCouplings> couplings = new ArrayList<PatternCouplings>();
static {
TimeZone utc = TimeZone.getTimeZone("UTC");
xep0091Formatter.setTimeZone(utc);
xep0091Date6DigitFormatter.setTimeZone(utc);
xep0091Date7Digit1MonthFormatter.setTimeZone(utc);
xep0091Date7Digit1MonthFormatter.setLenient(false);
xep0091Date7Digit2MonthFormatter.setTimeZone(utc);
xep0091Date7Digit2MonthFormatter.setLenient(false);
couplings.add(new PatternCouplings(datePattern, dateFormatter));
couplings.add(new PatternCouplings(dateTimePattern, dateTimeFormatter));
couplings.add(new PatternCouplings(dateTimeNoMillisPattern, dateTimeNoMillisFormatter));
couplings.add(new PatternCouplings(timePattern, timeFormatter));
couplings.add(new PatternCouplings(timeNoZonePattern, timeNoZoneFormatter));
couplings.add(new PatternCouplings(timeNoMillisPattern, timeNoMillisFormatter));
couplings.add(new PatternCouplings(timeNoMillisNoZonePattern, timeNoMillisNoZoneFormatter));
}
/**
* Parses the given date string in the <a
* href="http://xmpp.org/extensions/xep-0082.html">XEP-0082 - XMPP Date and Time Profiles</a>.
*
* @param dateString the date string to parse
* @return the parsed Date
* @throws ParseException if the specified string cannot be parsed
* @deprecated Use {@link #parseDate(String)} instead.
*/
public static Date parseXEP0082Date(String dateString) throws ParseException {
return parseDate(dateString);
}
/**
* Parses the given date string in either of the three profiles of <a
* href="http://xmpp.org/extensions/xep-0082.html">XEP-0082 - XMPP Date and Time Profiles</a> or
* <a href="http://xmpp.org/extensions/xep-0091.html">XEP-0091 - Legacy Delayed Delivery</a>
* format.
* <p>
* This method uses internal date formatters and is thus threadsafe.
*
* @param dateString the date string to parse
* @return the parsed Date
* @throws ParseException if the specified string cannot be parsed
*/
public static Date parseDate(String dateString) throws ParseException {
Matcher matcher = xep0091Pattern.matcher(dateString);
/*
* if date is in XEP-0091 format handle ambiguous dates missing the leading zero in month
* and day
*/
if (matcher.matches()) {
int length = dateString.split("T")[0].length();
if (length < 8) {
Date date = handleDateWithMissingLeadingZeros(dateString, length);
if (date != null)
return date;
}
else {
synchronized (xep0091Formatter) {
return xep0091Formatter.parse(dateString);
}
}
}
else {
for (PatternCouplings coupling : couplings) {
matcher = coupling.pattern.matcher(dateString);
if (matcher.matches()) {
return coupling.formatter.parse(dateString);
}
}
}
/*
* We assume it is the XEP-0082 DateTime profile with no milliseconds at this point. If it
* isn't, is is just not parseable, then we attempt to parse it regardless and let it throw
* the ParseException.
*/
synchronized (dateTimeNoMillisFormatter) {
return dateTimeNoMillisFormatter.parse(dateString);
}
}
/**
* Formats a Date into a XEP-0082 - XMPP Date and Time Profiles string.
*
* @param date the time value to be formatted into a time string
* @return the formatted time string in XEP-0082 format
*/
public static String formatXEP0082Date(Date date) {
synchronized (dateTimeFormatter) {
return dateTimeFormatter.format(date);
}
}
/**
* Converts a XEP-0082 date String's time zone definition into a RFC822 time zone definition.
* The major difference is that XEP-0082 uses a smicolon between hours and minutes and RFC822
* does not.
*
* @param dateString
* @return the String with converted timezone
*/
public static String convertXep82TimezoneToRfc822(String dateString) {
if (dateString.charAt(dateString.length() - 1) == 'Z') {
return dateString.replace("Z", "+0000");
}
else {
// If the time zone wasn't specified with 'Z', then it's in
// ISO8601 format (i.e. '(+|-)HH:mm')
// RFC822 needs a similar format just without the colon (i.e.
// '(+|-)HHmm)'), so remove it
return dateString.replaceAll("([\\+\\-]\\d\\d):(\\d\\d)", "$1$2");
}
}
public static String convertRfc822TimezoneToXep82(String dateString) {
int length = dateString.length();
String res = dateString.substring(0, length -2);
res += ':';
res += dateString.substring(length - 2, length);
return res;
}
/**
* Converts a time zone to the String format as specified in XEP-0082
*
* @param timeZone
* @return the String representation of the TimeZone
*/
public static String asString(TimeZone timeZone) {
int rawOffset = timeZone.getRawOffset();
int hours = rawOffset / (1000*60*60);
int minutes = Math.abs((rawOffset / (1000*60)) - (hours * 60));
return String.format("%+d:%02d", hours, minutes);
}
/**
* Parses the given date string in different ways and returns the date that lies in the past
* and/or is nearest to the current date-time.
*
* @param stampString date in string representation
* @param dateLength
* @param noFuture
* @return the parsed date
* @throws ParseException The date string was of an unknown format
*/
private static Date handleDateWithMissingLeadingZeros(String stampString, int dateLength)
throws ParseException {
if (dateLength == 6) {
synchronized (xep0091Date6DigitFormatter) {
return xep0091Date6DigitFormatter.parse(stampString);
}
}
Calendar now = Calendar.getInstance();
Calendar oneDigitMonth = parseXEP91Date(stampString, xep0091Date7Digit1MonthFormatter);
Calendar twoDigitMonth = parseXEP91Date(stampString, xep0091Date7Digit2MonthFormatter);
List<Calendar> dates = filterDatesBefore(now, oneDigitMonth, twoDigitMonth);
if (!dates.isEmpty()) {
return determineNearestDate(now, dates).getTime();
}
return null;
}
private static Calendar parseXEP91Date(String stampString, DateFormat dateFormat) {
try {
synchronized (dateFormat) {
dateFormat.parse(stampString);
return dateFormat.getCalendar();
}
}
catch (ParseException e) {
return null;
}
}
private static List<Calendar> filterDatesBefore(Calendar now, Calendar... dates) {
List<Calendar> result = new ArrayList<Calendar>();
for (Calendar calendar : dates) {
if (calendar != null && calendar.before(now)) {
result.add(calendar);
}
}
return result;
}
private static Calendar determineNearestDate(final Calendar now, List<Calendar> dates) {
Collections.sort(dates, new Comparator<Calendar>() {
public int compare(Calendar o1, Calendar o2) {
Long diff1 = new Long(now.getTimeInMillis() - o1.getTimeInMillis());
Long diff2 = new Long(now.getTimeInMillis() - o2.getTimeInMillis());
return diff1.compareTo(diff2);
}
});
return dates.get(0);
}
private static class PatternCouplings {
final Pattern pattern;
final DateFormatType formatter;
public PatternCouplings(Pattern datePattern, DateFormatType dateFormat) {
pattern = datePattern;
formatter = dateFormat;
}
}
}
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