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package com.sun.xml.wss.util;
import java.text.MessageFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
/**
* This class provides utility to perform date conversion.
*/
public class DateUtils {
private static final String UTC_DATE_Z_FORMAT = "{0}-{1}-{2}T{3}:{4}:{5}Z";
private static final String UTC_DATE_FORMAT = "{0}-{1}-{2}T{3}:{4}:{5}";
private static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("UTC");
/**
* Returns yyyy-MM-dd HH:mm:ss String representation of a date.
*
* @param date Date object.
*/
public static String dateToString(Date date) {
return dateToString(date, UTC_DATE_FORMAT);
}
/**
* Returns UTC String representation of a date. For instance,
* 2004-03-20T05:53:32Z.
*
* @param date Date object.
*/
public static String toUTCDateFormat(Date date) {
return dateToString(date, UTC_DATE_Z_FORMAT);
}
private static String dateToString(Date date, String format) {
GregorianCalendar cal = new GregorianCalendar(UTC_TIME_ZONE);
cal.setTime(date);
String[] params = new String[6];
params[0] = formatInteger(cal.get(Calendar.YEAR), 4);
params[1] = formatInteger(cal.get(Calendar.MONTH) +1, 2);
params[2] = formatInteger(cal.get(Calendar.DAY_OF_MONTH), 2);
params[3] = formatInteger(cal.get(Calendar.HOUR_OF_DAY), 2);
params[4] = formatInteger(cal.get(Calendar.MINUTE), 2);
params[5] = formatInteger(cal.get(Calendar.SECOND), 2);
return MessageFormat.format(format, (Object[])params);
}
private static String formatInteger(int value, int length) {
String val = Integer.toString(value);
int diff = length - val.length();
for (int i = 0; i < diff; i++) {
val = "0" + val;
}
return val;
}
/**
* Returns date that is represented by a string.
* It uses the following representation of date. yyyy-MM-DD'T'hh:mm:ss
* based on the following definition of "dateTime" attribute in XML
* schema which can be found at http://www.w3.org/TR/xmlschema-2/#dateTime.
* A single lexical representation, which is a subset of the lexical
* representations allowed by [ISO 8601], is allowed for dateTime. This
* lexical representation is the [ISO 8601] extended format
* CCYY-MM-DDThh:mm:ss where "CC" represents the century, "YY" the year,
* "MM" the month and "DD" the day, preceded by an optional leading "-" sign
* to indicate a negative number. If the sign is omitted, "+" is assumed.
* The letter "T" is the date/time separator and "hh", "mm", "ss" represent
* hour, minute and second respectively. Additional digits can be used to
* increase the precision of fractional seconds if desired i.e the format
* ss.ss... with any number of digits after the decimal point is supported.
* The fractional seconds part is optional; other parts of the lexical form
* are not optional. To accommodate year values greater than 9999 additional
* digits can be added to the left of this representation. Leading zeros are
* required if the year value would otherwise have fewer than four digits;
* otherwise they are forbidden. The year 0000 is prohibited.
* The CCYY field must have at least four digits, the MM, DD, SS, hh, mm and
* ss fields exactly two digits each (not counting fractional seconds);
* leading zeroes must be used if the field would otherwise have too few
* digits.
*
* This representation may be immediately followed by a "Z" to indicate
* Coordinated Universal Time (UTC) or, to indicate the time zone, i.e. the
* difference between the local time and Coordinated Universal Time,
* immediately followed by a sign, + or -, followed by the difference from
* UTC represented as hh:mm (note: the minutes part is required). See ISO
* 8601 Date and Time Formats ('D) for details about legal values in the
* various fields. If the time zone is included, both hours and minutes must
* be present.
*
* For example, to indicate 1:20 pm on May the 31st, 1999 for Eastern
* Standard Time which is 5 hours behind Coordinated Universal Time
* (UTC), one would write: 1999-05-31T13:20:00-05:00.
*
* @param strDate String representation of date.
* @throws ParseException if strDate is in an invalid format.
*/
public static Date stringToDate(String strDate)
throws ParseException
{
int[] diffTime = null;
boolean plusTime = true;
// get time differences (if any)
int idxT = strDate.indexOf('T');
if (idxT == -1) {
throw new ParseException("Invalid Date Format", 0);
}
int idxDiffUTC = strDate.indexOf('-', idxT);
if (idxDiffUTC == -1) {
idxDiffUTC = strDate.indexOf('+', idxT);
plusTime = false;
}
if (idxDiffUTC != -1) {
diffTime = getDiffTime(strDate, idxDiffUTC);
strDate = strDate.substring(0, idxDiffUTC);
}
int idxMilliSec = strDate.indexOf('.');
if (idxMilliSec != -1) {
strDate = strDate.substring(0, idxMilliSec);
} else {
// remove the trailing z/Z character
char lastChar = strDate.charAt(strDate.length()-1);
if ((lastChar == 'z') || (lastChar == 'Z')) {
strDate = strDate.substring(0, strDate.length()-1);
}
}
return createDate(strDate, diffTime, plusTime);
}
/**
* Returns the difference portion of a date string. Array of integer
* with the first element defining the hour difference; and second element
* defining the minute difference
*
* @param strDate Date String.
* @param idx index of the character.
* @returns the difference portion of a date string.
* @throws ParseException if strDate is in an invalid format.
*/
private static int[] getDiffTime(String strDate, int idx)
throws ParseException
{
// discard the plus/minus char and trailing z char.
String strDiff = strDate.substring(idx+1, strDate.length()-1);
int[] diffArray = new int[2];
int colonIdx = strDiff.indexOf(':');
if (colonIdx == -1) {
throw new ParseException("Invalid Date Format", 0);
}
try {
diffArray[0] = Integer.parseInt(strDiff.substring(0, colonIdx));
diffArray[1] = Integer.parseInt(strDiff.substring(colonIdx+1));
} catch (NumberFormatException nfe) {
throw new ParseException("Invalid Date Format", 0);
}
return diffArray;
}
/**
* Returns a date with a string of yyyy-MM-ssThh:mm:ss or
* yyyy-MM-ssThh:mm.
*
* @param strDate string representation of a date.
* @param timeDiff time differences
* @param plusDiff time differences (plus/minus). true indicates do a plus
* to the computed date. Ignore this value if timeDiff
* is null.
*/
private static Date createDate(
String strDate,
int[] timeDiff,
boolean plusDiff
) throws ParseException
{
try {
int year = Integer.parseInt(strDate.substring(0, 4));
if (strDate.charAt(4) != '-') {
throw new ParseException("Invalid Date Format", 0);
}
int month = Integer.parseInt(strDate.substring(5, 7)) -1;
if (strDate.charAt(7) != '-') {
throw new ParseException("Invalid Date Format", 0);
}
int day = Integer.parseInt(strDate.substring(8, 10));
if (strDate.charAt(10) != 'T') {
throw new ParseException("Invalid Date Format", 0);
}
int hour = Integer.parseInt(strDate.substring(11, 13));
if (strDate.charAt(13) != ':') {
throw new ParseException("Invalid Date Format", 0);
}
int minute = Integer.parseInt(strDate.substring(14, 16));
int second = 0;
if (strDate.length() > 17) {
if (strDate.charAt(16) != ':') {
throw new ParseException("Invalid Date Format", 0);
}
second = Integer.parseInt(strDate.substring(17, 19));
}
GregorianCalendar cal = new GregorianCalendar(
year, month, day, hour, minute, second);
cal.setTimeZone(UTC_TIME_ZONE);
if (timeDiff != null) {
int hourDiff = (plusDiff) ? timeDiff[0] : (-1 * timeDiff[0]);
int minuteDiff = (plusDiff) ? timeDiff[1] : (-1 * timeDiff[1]);
cal.add(Calendar.HOUR, hourDiff);
cal.add(Calendar.MINUTE, minuteDiff);
}
return cal.getTime();
} catch (NumberFormatException nfe) {
throw new ParseException("Invalid Date Format", 0);
}
}
}
