org.apache.myfaces.dateformat.SimpleDateFormatter Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.myfaces.dateformat;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
/**
* A reimplementation of the java.text.SimpleDateFormat class.
*
* This class has been created for use with the tomahawk InputCalendar
* component. It exists for the following reasons:
*
* - The java.text.SimpleDateFormat class is simply broken with respect
* to "week of year" functionality.
*
- The inputCalendar needs a javascript equivalent of SimpleDateFormat
* in order to process data in the popup calendar. But it is hard to
* unit-test javascript code. By maintaining a version in Java that is
* unit-tested, then making the javascript version a direct "port" of that
* code the javascript gets improved reliability.
*
- Documentation is necessary for this code, but it is not desirable to
* add lots of docs to a javascript file that is downloaded. The javascript
* version can simply reference the documentation here.
*
* Note that the JODA project also provides a SimpleDateFormat implementation,
* but that does not support firstDayOfWeek functionality. In any case,
* it is not desirable to add a dependency from tomahawk on JODA just for
* the InputCalendar.
*
* This implementation does extend the SimpleDateFormat class by adding the
* JODA "xxxx" yearOfWeekYear format option, as this is missing in the
* standard SimpleDateFormat class.
*
* The parse methods also return null on error rather than throw an exception.
*
* The code here was originally written in javascript (date.js), and has been
* ported to java.
*
* At the current time, the following format options are NOT supported:
* DFkKSzZ.
*
*
Week Based Calendars
*
* ISO standard ISO-8601 defines a calendaring system based not upon
* year/month/day_in_month but instead year/week/day_in_week. This is
* particularly popular in embedded systems as date arithmetic is
* much simpler; there are no irregular month lengths to handle.
*
* The only tricky part is mapping to and from year/month/day formats.
* Unfortunately, while java.text.SimpleDateFormat does support a "ww"
* week format character, it has a number of flaws.
*
* Weeks are always complete and discrete, ie week yyyy-ww always has
* 7 days in it, and never "shares" days with yyyy-(ww+1). However to
* achieve this, the last week of a year might include a few days of
* the next year, or the last few days of a year might be counted as
* part of the first week of the following year. The decision is made
* depending on which year the "majority" of days in that week belong to.
*
* With ISO-8601, a week always starts on a monday. However many countries
* use a different convention, starting weeks on saturday, sunday or monday.
* This class supports setting the firstDayOfWeek.
*
* @since 1.1.7
* @author Simon Kitching (latest modification by $Author: grantsmith $)
* @version $Revision: 472638 $ $Date: 2006-11-08 15:54:13 -0500 (Wed, 08 Nov 2006) $
*/
public class SimpleDateFormatter
{
private static final long MSECS_PER_SEC = 1000;
private static final long MSECS_PER_MIN = 60 * MSECS_PER_SEC;
private static final long MSECS_PER_HOUR = 60 * MSECS_PER_MIN;
private static final long MSECS_PER_DAY = 24 * MSECS_PER_HOUR;
private static final long MSECS_PER_WEEK = 7 * MSECS_PER_DAY;
// ======================================================================
// Static Week-handling Methods
// ======================================================================
/**
* Cumulative sum of the number of days in the year up to the first
* day of each month.
*/
private static final int[] MONTH_LEN =
{
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
/**
* Return the ISO week# represented by the specified date (1..53).
*
* This implements the ISO-8601 standard for week numbering, as documented in
* Klaus Tondering's Calendar document, version 2.8:
* http://www.tondering.dk/claus/calendar.html
*
* For dates in January and February, calculate:
*
* a = year-1
* b = a/4 - a/100 + a/400
* c = (a-1)/4 - (a-1)/100 + (a-1)/400
* s = b-c
* e = 0
* f = day - 1 + 31*(month-1)
*
* For dates in March through December, calculate:
*
* a = year
* b = a/4 - a/100 + a/400
* c = (a-1)/4 - (a-1)/100 + (a-1)/400
* s = b-c
* e = s+1
* f = day + (153*(month-3)+2)/5 + 58 + s
*
* Then, for any month continue thus:
*
* g = (a + b) mod 7
* d = (f + g - e) mod 7
* n = f + 3 - d
*
* We now have three situations:
*
* If n<0, the day lies in week 53-(g-s)/5 of the previous year.
* If n>364+s, the day lies in week 1 of the coming year.
* Otherwise, the day lies in week n/7 + 1 of the current year.
*
* This algorithm gives you a couple of additional useful values:
*
* d indicates the day of the week (0=Monday, 1=Tuesday, etc.)
* f+1 is the ordinal number of the date within the current year.
*
* Note that ISO-8601 specifies that week1 of a year is the first week in
* which the majority of days lie in that year. An equivalent description
* is that it is the first week including the 4th of january. This means
* that the 1st, 2nd and 3rd of January might lie in the last week of the
* previous year, and that the last week of a year may include the first
* few days of the following year.
*
* ISO-8601 also specifies that the first day of the week is always Monday.
*
* This function returns the week number regardless of which year it lies in.
* That means that asking for the week# of 01/01/yyyy might return 52 or 53,
* and asking for the week# of 31/12/yyyy might return 1.
*/
public static WeekDate getIsoWeekDate(Date date)
{
int year = fullYearFromDate(date.getYear());
int month = date.getMonth() + 1;
int day = date.getDate();
int a,b,c,d,e,f,g,s,n;
if (month <= 2)
{
a = year - 1;
b = (int) Math.floor(a/4) - (int) Math.floor(a/100) + (int) Math.floor(a/400);
c = (int) Math.floor((a-1)/4) - (int) Math.floor((a-1)/100) + (int) Math.floor((a-1)/400);
s = b - c;
e = 0;
f = day - 1 + 31*(month-1);
}
else
{
a = year;
b = (int) Math.floor(a/4) - (int) Math.floor(a/100) + (int) Math.floor(a/400);
c = (int) Math.floor((a-1)/4) - (int) Math.floor((a-1)/100) + (int) Math.floor((a-1)/400);
s = b - c;
e = s + 1;
f = day + (int) Math.floor((153*(month-3) + 2)/5) + 58 + s;
}
g = (a + b) % 7;
d = (f + g - e) % 7;
n = f + 3 - d;
if (n<0)
{
// previous year
int resultWeek = 53 - (int) Math.floor((g-s)/5);
return new WeekDate(year-1, resultWeek);
}
else if (n > (364+s))
{
// next year
int resultWeek = 1;
return new WeekDate(year+1, resultWeek);
}
else
{
// current year
int resultWeek = (int) Math.floor(n/7) + 1;
return new WeekDate(year, resultWeek);
}
}
/** Return true if the specified year is a leapyear (has 29 days in feb). */
private static boolean isLeapYear(int year)
{
return ((year%4 == 0) && (year%100 != 0)) || (year%400 == 0);
}
/**
* Compute which day of the week (sun,mon, etc) a particular date
* falls on.
*
* Returns 0 for sunday, 1 for monday, 6 for saturday (the java.util.Date
* and the javascript Date convention):
*
* Note that java.util.Calendar uses 1=sun, 7=sat.
*
* This algorithm is documented as part of the RFC3339 specification.
*
* @param year is full year value (eg 2007).
* @param month is 1..12
* @param day is 1..31
*/
private static int dayOfWeek(int year, int month, int day)
{
/* adjust months so February is the last one */
month -= 2;
if (month < 1)
{
month += 12;
--year;
}
/* split by century */
int cent = year / 100;
year %= 100;
// dow (0=sunday)
int base =
(26 * month - 2) / 10
+ day
+ year
+ (year / 4)
+ (cent / 4)
+ (5 * cent);
int dow = base % 7;
return dow;
}
/**
* Return the (year, week) representation of the given date.
*
* This is exactly like getIsoWeekNumber, except that a firstDayOfWeek
* can be specified; ISO-8601 hard-wires "monday" as first day of week.
*
* TODO: support minimumDaysInWeek property. Currently, assumes
* this is set to 4 (the ISO standard).
*
* @param firstDayOfWeek is: 0=sunday, 1=monday, 6=sat. This is the
* convention used by java.util.Date. NOTE: java.util.Calendar uses
* 1=sunday, 2=monday, 7=saturday.
*/
public static WeekDate getWeekDate(Date date, int firstDayOfWeek)
{
int year = fullYearFromDate(date.getYear());
int month = date.getMonth() + 1;
int day = date.getDate();
boolean thisIsLeapYear = isLeapYear(year);
int dayOfYear = day + MONTH_LEN[month-1];
if (thisIsLeapYear && (month>2))
{
++dayOfYear;
}
int jan1Weekday = dayOfWeek(year, 1, 1);
// The first week of a year always starts on firstDayOfWeek. However that
// week starts up to 3 days before the 1st of the year, or 3 days after.
//
// Here, we find where the first week actually starts, measured as an
// offset from the first day of the year (-3..+3).
//
// Examples:
// * if firstDayOfWeek=mon, and 1st jan is wed, then pivotOffset=-2,
// ie 30 dec of previous year is where the first week starts.
// * if firstDayOfWeek=sun and 1st jan is fri, then pivotOffset=2,
// ie 3 jan is where the first week starts.
int pivotOffset = firstDayOfWeek - jan1Weekday;
if (pivotOffset > 3)
{
pivotOffset -= 7;
}
else if (pivotOffset < -3)
{
pivotOffset += 7;
}
// Compute the offset of date relative to the start of this year.
// This will be in range 0..364 (or 365 for leap year)
int dayOffset = dayOfYear-1;
if (dayOffset < pivotOffset)
{
// This date falls in either week52 or week53 of the previous year
//
// Because (365%7)=1, the pivotOffset moves forweards by one if the previous
// year is a normal one, or two if the previous year is a leapyear (wrapping
// around from +3 to -3). And a year has 53 weeks only when its pivotOffset
// is -3 (or -2 for leapyear).
//
// so:
// when prev is not leapyear, has53 when pivotOffset is 3 for this year.
// when prev is leapyear, has53 when pivotOffset is 2 or 3 for this year.
boolean prevIsLeapYear = isLeapYear(year-1);
if ((pivotOffset==3) || ((pivotOffset==2) && prevIsLeapYear))
{
return new WeekDate(year-1, 53);
}
return new WeekDate(year-1, 52);
}
// Compute the number of days relative to the start of the first
// week in this year, then divide by seven to get the week count.
int daysFromFirstWeekStart = (dayOfYear - 1 - pivotOffset);
int weekNumber = daysFromFirstWeekStart/7 + 1;
// In a normal year, there are 52 weeks with 1 day (365%7) left over.
//
// So, when weeks start on the first day of a year, there is one day left
// at the end, which will fall into the first week of the next year. When
// weeks start on the 2nd, then week 52 ends on 31 dec. When weeks start on
// the max pivotOffset of +3, then week52 includes 3jan of next year. It is
// still week52 because only 3 days are from the next year adn 4 are in the
// current year.
//
// But when pivotOffset is -3, then there are 4 days left over at the end of
// the year - making week 53. And in a leap year, pivotOffset=-2 is sufficient
// to create a week53.
if ((weekNumber < 53)
|| (pivotOffset==-3)
|| (pivotOffset==-2 && thisIsLeapYear))
{
return new WeekDate(year, weekNumber);
}
else
{
// weekNumber=53, but this year only has 52 weeks so this must be week
// one of the next year.
return new WeekDate(year+1, 1);
}
}
/**
* Return the point in time at which the first week of the specified year starts.
*/
private static long getStartOfWeekYear(int year, int firstDayOfWeek)
{
// Create a new date on the 1st.
Date d1 = new Date(shortYearFromDate(year), 0, 1, 0, 0, 0);
// adjust forward or backwards to the nearest firstDayOfWeek
int firstDayOfYear = d1.getDay(); // 0 = sunday
int dayDiff = firstDayOfWeek - firstDayOfYear;
int dayShift;
if (dayDiff >= 4)
{
dayShift = 7-dayDiff;
}
else if (dayDiff >= 0)
{
dayShift = dayDiff;
}
else if (dayDiff >= -3)
{
dayShift = dayDiff;
} else
{
dayShift = 7 + dayDiff;
}
// now compute the number of weeks between start of weekYear and input date.
long weekYearStartMsecs = d1.getTime() + (dayShift* MSECS_PER_DAY);
return weekYearStartMsecs;
}
/**
* This is the inverse of method getJavaWeekNumber.
*/
private static Date getDateForWeekDate
(
int year, int week, int day,
int hour, int min, int sec,
int firstDayOfWeek)
{
long msecsBase = getStartOfWeekYear(year, firstDayOfWeek);
long msecsOffset = (week - 1) * MSECS_PER_WEEK;
msecsOffset += (day-1) * MSECS_PER_DAY;
msecsOffset += hour * MSECS_PER_HOUR;
msecsOffset += min * MSECS_PER_MIN;
msecsOffset += sec * MSECS_PER_SEC;
Date finalDate = new Date();
finalDate.setTime(msecsBase + msecsOffset);
return finalDate;
}
// ======================================================================
// Static Generic Date Manipulation Methods
// ======================================================================
private static int fullYearFromDate(int year)
{
if (year < 1900)
{
return year + 1900;
}
else
{
return year;
}
}
private static int shortYearFromDate(int year)
{
if (year > 1900)
{
return year - 1900;
}
else
{
return year;
}
}
private static Date createDateFromContext(ParserContext context)
{
Date date;
if (context.weekOfWeekYear != 0)
{
date = getDateForWeekDate(
context.weekYear, context.weekOfWeekYear, context.day,
context.hour, context.min, context.sec,
context.firstDayOfWeek);
}
else
{
// Class java.util.Date expects year to be relative to 1900. Note that
// this is different for javascript Date class - that takes a year
// relative to 0AD.
date = new Date(
context.year - 1900, context.month, context.day,
context.hour, context.min, context.sec);
}
return date;
}
/**
* Return a substring starting from a specific location, and extending
* len characters.
*
* It is an error if s is null.
* It is an error if s.length <= start.
*
* It is NOT an error if s.length < start+len; in this case a string
* starting at "start" but less than len characters will be returned.
*/
private static String substr(String s, int start, int len)
{
String s2 = s.substring(start);
if (s2.length() <= len)
return s2;
else
return s2.substring(0, len);
}
// ======================================================================
// Static Parsing Methods
// ======================================================================
/**
* Parse a string according to the provided sequence of parsing ops.
*
* Returns a ParserContext object that has its year/month/day etc fields
* set according to data extracted from the string.
*
* If an error has occured during parsing, context.invalid will be true.
*/
private static ParserContext parseOps(
DateFormatSymbols symbols, boolean yearIsWeekYear,
int firstDayOfWeek,
String[] ops, String dateStr)
{
ParserContext context = new ParserContext(firstDayOfWeek);
int dateIndex = 0;
int dateStrLen = dateStr.length();
for(int i=0; (i= 4)
{
String fragment = dateStr.substring(dateIndex);
int index = parsePrefixOf(context, symbols.months, fragment);
if (index != -1)
{
context.month = index;
}
}
else
{
context.month = parseNum(context, dateStr, 2, dateIndex) - 1;
}
}
else if (c == 'd')
{
context.day = parseNum(context, dateStr, 2, dateIndex);
}
else if (c == 'E')
{
if (patlen <= 3)
{
String fragment = dateStr.substring(dateIndex, dateIndex+3);
int index = parseIndexOf(context, symbols.shortWeekdays, fragment);
if (index != -1)
{
context.dayOfWeek = index;
}
}
else
{
String fragment = dateStr.substring(dateIndex);
int index = parsePrefixOf(context, symbols.weekdays, fragment);
if (index != -1)
{
context.dayOfWeek = index;
}
}
}
else if (c == 'H')
{
// H is in range 0..23
context.hour = parseNum(context, dateStr, 2, dateIndex);
}
else if (c == 'h')
{
// h is in range 1am..12pm or 1pm-12am.
// Note that this field is later post-adjusted
context.hourAmpm = parseNum(context, dateStr, 2, dateIndex);
}
else if (c == 'm')
{
context.min = parseNum(context, dateStr, 2, dateIndex);
}
else if (c == 's')
{
context.sec = parseNum(context, dateStr, 2, dateIndex);
}
else if (c == 'a')
{
context.ampm = parseString(context, dateStr, dateIndex, symbols.ampms);
}
else if (c == 'w')
{
context.weekOfWeekYear = parseNum(context, dateStr, 2, dateIndex);
}
else
{
context.invalid = true;
}
}
/**
* Convert a string of digits (in base 10) to an integer.
*
* Only positive values are accepted. Returns -1 on failure.
*/
private static int parseInt(String value)
{
int sum = 0;
for(int i=0; i< value.length(); ++i)
{
char c = value.charAt(i);
if ((c<'0') || (c>'9'))
{
return -1;
}
sum = sum*10 + (c-'0');
}
return sum;
}
/**
* Convert at most the next nChars characters to numeric, starting from offset dateIndex
* within dateStr.
*
* Updates context.newIndex to contain the offset of the next unparsed char.
*/
private static int parseNum(ParserContext context, String dateStr, int nChars, int dateIndex)
{
// Try to convert the most possible characters (nChars). If that fails,
// then try again without the last character. Repeat until successful
// numeric conversion occurs.
int nToParse = Math.min(nChars, dateStr.length() - dateIndex);
for(int i=nToParse;i>0;i--)
{
String numStr = dateStr.substring(dateIndex,dateIndex+i);
int value = parseInt(numStr);
if(value == -1)
continue;
context.newIndex = dateIndex+i;
return value;
}
context.newIndex = -1;
context.invalid = true;
return -1;
}
/**
* Return the index of the array element which matches the provided string.
*
* This is used when the next thing in value (string being parsed) is expected
* to be one of the values in the provided array, AND all the array entries
* are of the same length. The appropriate sequence of chars can then be
* extracted from the string to parse, and passed here as the exact value
* to be matched.
*/
private static int parseIndexOf(ParserContext context, String[] array, String value)
{
for(int i=0; i
* This is used when the next thing in value (string being parsed) is expected
* to be one of the values in the provided array.
*
* This is like indexOf, except that an exact match is not expected.
*/
private static int parsePrefixOf(ParserContext context, String[] array, String value)
{
for(int i=0; i
* Returns an index into the strings array, or -1 if none match.
*
* Also updates context.newIndex to be the location after the matched string (if any).
* On failure, the context.invalid flag is set before returning -1.
*/
private static int parseString(ParserContext context, String dateStr, int dateIndex, String[] strings)
{
String fragment = dateStr.substring(dateIndex);
return parsePrefixOf(context, strings, fragment);
}
/**
* Handle fields that need to be processed after all information is available.
*/
private static void parsePostProcess(DateFormatSymbols symbols, ParserContext context)
{
if (context.ambiguousYear)
{
// TODO: maybe this adjustment could be made while parsing?
context.year += 1900;
Date date = createDateFromContext(context);
Date threshold = symbols.twoDigitYearStart;
if (date.getTime() < threshold.getTime())
{
context.year += 100;
}
}
if (context.hourAmpm > 0)
{
// yes, the user has set the hour using 12-hour clock
// 01am->01, 11am->11, 12pm->12, 1pm->13, 11pm->23, 12pm->00
if (context.ampm == 1)
{
context.hour = context.hourAmpm + 12;
if (context.hour == 24)
context.hour = 0;
}
else
{
context.hour = context.hourAmpm;
}
}
}
// ======================================================================
// Static Formatting Methods
// ======================================================================
private static String formatOps(
DateFormatSymbols symbols, boolean yearIsWeekYear,
int firstDayOfWeek,
String[] ops, Date date)
{
ParserContext context = new ParserContext(firstDayOfWeek);
context.year = fullYearFromDate(date.getYear());
context.month = date.getMonth();
context.day = date.getDate();
context.dayOfWeek = date.getDay();
context.hour = date.getHours();
context.min = date.getMinutes();
context.sec = date.getSeconds();
// 00 --> 12am, 01->1am, 12 --> 12pm, 13 -> 1pm, 23->11pm
context.ampm = (context.hour < 12) ? 0 : 1;
WeekDate weekDate = getWeekDate(date, firstDayOfWeek);
context.weekYear = weekDate.getYear();
context.weekOfWeekYear = weekDate.getWeek();
StringBuffer str = new StringBuffer();
for(int i=0; i= 4)
{
out.append(symbols.months[context.month]);
}
else
{
formatNum(context.month+1, patlen, false, out);
}
}
else if (c == 'd')
{
formatNum(context.day, patlen, false, out);
}
else if (c == 'E')
{
if (patlen <= 3)
{
out.append(symbols.shortWeekdays[context.dayOfWeek]);
}
else
{
out.append(symbols.weekdays[context.dayOfWeek]);
}
}
else if (c == 'H')
{
// output hour in range 0..23
formatNum(context.hour, patlen, false, out);
}
else if (c == 'h')
{
// output hour in range 1..12:
// 00 --> 12am, 01->1am, 12 --> 12pm, 13 -> 1pm, 23->11pm
int hour = context.hour;
if (hour == 0)
{
hour = 12; // 12am
}
else if (hour > 12)
{
hour = hour - 12;
}
formatNum(hour, patlen, false, out);
}
else if (c == 'm')
{
formatNum(context.min, patlen, false, out);
}
else if (c == 's')
{
formatNum(context.sec, patlen, false, out);
}
else if (c == 'a')
{
out.append(symbols.ampms[context.ampm]);
}
else if (c == 'w')
{
formatNum(context.weekOfWeekYear, patlen, false, out);
}
else
{
context.invalid = true;
}
}
/**
* Write out an integer padded with leading zeros to a specified width.
*
* If ensureLength is set, and the number is longer than length, then display only the
* rightmost length digits.
*/
private static void formatNum(int num, int length, boolean ensureLength, StringBuffer out)
{
String str = String.valueOf(num);
while (str.length() < length)
{
str = "0" + str;
}
// XXX do we have to distinguish left and right 'cutting'
//ensureLength - enable cutting only for parameters like the year, the other
if (ensureLength && str.length() > length)
{
str = str.substring(str.length() - length);
}
out.append(str);
}
// ======================================================================
// Pattern Processing Methods
// ======================================================================
/**
* Given a date parsing or formatting pattern, split it up into an
* array of separate pieces to be processed.
*
* Each piece is either:
*
* - a "format" section
*
- a "quote" section,
*
- a "literal" section, or
*
*
* A format section is a sequence of 1 or more identical alphabetical
* characters, eg "yyyy", "MMM" or "dd". When parsing, this indicates what
* data is expected next; if it is not a recognised sequence then it is
* just ignored. When formatting, this indicates which part of the provided
* date object should be output, and how to format it; if it is not a
* recognised sequence then it is simply written literally to the output.
*
* A quote section is something in the pattern that was enclosed in quote
* marks. When parsing, quote sections are expected to be present in exactly
* the same form in the input string; an error is reported if the data is
* not present. When formatting, quote sections are output literally as
* they occurred in the pattern.
*
* A literal section is a sequence of 1 or more non-quoted non-alphabetical
* characters, eg "-" or "+++". When parsing, literal sections just cause
* the same number of characters in the input stream to be skipped. When
* formatting, they are just output literally.
*
* The elements of the string array returned are of form "f:xxxx" (format
* section), "q:text" (quote section), or "l:-" (literal section).
*
* TODO: when formatting, should literal chars really just cause skipping?
*/
private static String[] analysePattern(String pattern)
{
int patternIndex = 0;
int patternLen = pattern.length();
char lastChar = 0;
StringBuffer patternSub = null;
boolean quoteMode = false;
List ops = new LinkedList();
while (patternIndex < patternLen)
{
char currentChar = pattern.charAt(patternIndex);
char nextChar;
if (patternIndex < patternLen - 1)
{
nextChar = pattern.charAt(patternIndex + 1);
}
else
{
nextChar = 0;
}
if (currentChar == '\'' && lastChar != '\\')
{
if (patternSub != null)
{
ops.add(patternSub.toString());
patternSub = null;
}
quoteMode = !quoteMode;
}
else if (quoteMode)
{
if (patternSub == null)
{
patternSub = new StringBuffer("q:");
}
patternSub.append(currentChar);
}
else
{
if (currentChar == '\\' && lastChar != '\\')
{
// do nothing
}
else
{
if (patternSub == null)
{
if (Character.isLetter(currentChar))
{
patternSub = new StringBuffer("f:");
}
else
{
patternSub = new StringBuffer("l:");
}
}
patternSub.append(currentChar);
if (currentChar != nextChar)
{
ops.add(patternSub.toString());
patternSub = null;
}
}
}
patternIndex++;
lastChar = currentChar;
}
if (patternSub != null)
{
ops.add(patternSub.toString());
}
String[] data = new String[ops.size()];
return (String[]) ops.toArray(data);
}
/**
* Determine whether to make the "yyyy" pattern behave in a non-standard manner.
*
* The java.text.SimpleDateFormat class has no option to output the "weekyear"
* property, ie the year in which the "ww" value occurs. This makes the "ww"
* formatter basically useless.
*
* This class therefore implements the JODA "xxxx" formatter that does exactly
* that. However many people will use "ww/yyyy" patterns without realising that
* this generates garbage (eg 01/2000 when it should output 01/2001 because the
* week has rolled over from one year to the next). This therefore checks whether
* ww is present in the pattern string, and if so makes yy work like xx. Of
* course this does not allow patterns like "xxxx-ww yyyy-MM-dd", so we then
* disable this hack if "xx" is also present.
*/
private static boolean hasWeekPattern(String[] ops)
{
boolean wwPresent = false;
boolean xxPresent = false;
for(int i=0; i