https://github.com/jruby/jruby/jruby-core: JRuby is the effort to recreate the Ruby (https://www.ruby-lang.org) interpreter in Java. (JRuby)
  • headius
  • enebo
  • wmeissner
  • BanzaiMan
  • mkristian 
BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
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.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2002, 2009 Jan Arne Petersen 
Copyright (C) 2004 Charles O Nutter 
Copyright (C) 2004 Anders Bengtsson 
Copyright (C) 2004 Stefan Matthias Aust 
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK 
/***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * 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.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2002, 2009 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2004 Charles O Nutter <headius@headius.com>
 * Copyright (C) 2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.util;

import java.text.DateFormat;
import java.text.DateFormatSymbols;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.util.Calendar;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;

import org.joda.time.Chronology;
import org.joda.time.DateTime;
import org.joda.time.chrono.GJChronology;
import org.joda.time.chrono.JulianChronology;

import static org.jruby.util.RubyDateFormat.FieldType.*;

@Deprecated
public class RubyDateFormat extends DateFormat {
    private static final long serialVersionUID = -250429218019023997L;

    private final List<Token> compiledPattern;

    private final DateFormatSymbols formatSymbols;

    
raw string, no formatting 
/** raw string, no formatting */
    private static final int FORMAT_STRING = 0;
    
%A 
/** %A */
    private static final int FORMAT_WEEK_LONG = 1;
    
%a 
/** %a */
    private static final int FORMAT_WEEK_SHORT = 2;
    
%B 
/** %B */
    private static final int FORMAT_MONTH_LONG = 3;
    
%b, %h 
/** %b, %h */
    private static final int FORMAT_MONTH_SHORT = 4;
    
%d 
/** %d */
    private static final int FORMAT_DAY = 5;
    
%e 
/** %e */
    private static final int FORMAT_DAY_S = 6;
    
%H 
/** %H */
    private static final int FORMAT_HOUR = 7;
    
%I 
/** %I */
    private static final int FORMAT_HOUR_M = 8;
    
%l 
/** %l */
    private static final int FORMAT_HOUR_S = 9;
    
%j 
/** %j */
    private static final int FORMAT_DAY_YEAR = 10;
    
%M 
/** %M */
    private static final int FORMAT_MINUTES = 11;
    
%m 
/** %m */
    private static final int FORMAT_MONTH = 12;
    
%p 
/** %p */
    private static final int FORMAT_MERIDIAN = 13;
    
%P 
/** %P */
    private static final int FORMAT_MERIDIAN_LOWER_CASE = 14;
    
%S 
/** %S */
    private static final int FORMAT_SECONDS = 15;
    
%U 
/** %U */
    private static final int FORMAT_WEEK_YEAR_S = 16;
    
%W 
/** %W */
    private static final int FORMAT_WEEK_YEAR_M = 17;
    
%w 
/** %w */
    private static final int FORMAT_DAY_WEEK = 18;
    
%Y 
/** %Y */
    private static final int FORMAT_YEAR_LONG = 19;
    
%y 
/** %y */
    private static final int FORMAT_YEAR_SHORT = 20;
    
%z, %:z, %::z, %:::z 
/** %z, %:z, %::z, %:::z */
    private static final int FORMAT_COLON_ZONE_OFF = 21;
    
%Z 
/** %Z */
    private static final int FORMAT_ZONE_ID = 22;
    
%C 
/** %C */
    private static final int FORMAT_CENTURY = 23;
    
%k 
/** %k */
    private static final int FORMAT_HOUR_BLANK = 24;
    
%L 
/** %L */
    private static final int FORMAT_MILLISEC = 25;
    
%s 
/** %s */
    private static final int FORMAT_EPOCH = 26;
    
%u 
/** %u */
    private static final int FORMAT_DAY_WEEK2 = 27;
    
%V 
/** %V */
    private static final int FORMAT_WEEK_WEEKYEAR = 28;
    
%N 
/** %N */
    private static final int FORMAT_NANOSEC = 29;
    
%G 
/** %G */
    private static final int FORMAT_WEEKYEAR = 30;
    
formatter 
/** formatter */
    private static final int FORMAT_OUTPUT = 31;
    
%g 
/** %g */
    private static final int FORMAT_WEEKYEAR_SHORT = 32;
    /* Only for Date/DateTime from here */
    
%Q 
/** %Q */
    private static final int FORMAT_MICROSEC_EPOCH = 33;
    
%+ 
/** %+ */
    private static final int FORMAT_DATE_1 = 34;

    private static class Token {
        private final int format;
        private final Object data;
        
        public Token(int format) {
            this(format, null);
        }

        public Token(int format, Object data) {
            this.format = format;
            this.data = data;
        }
        
        
Gets the data.

Returns:Returns a Object
/**
         * Gets the data.
         * @return Returns a Object
         */
        public Object getData() {
            return data;
        }

        
Gets the format.

Returns:Returns a int
/**
         * Gets the format.
         * @return Returns a int
         */
        public int getFormat() {
            return format;
        }
    }

    
Constructor for RubyDateFormat.

/**
     * Constructor for RubyDateFormat.
     */
    public RubyDateFormat() {
        this("", new DateFormatSymbols());
    }

    public RubyDateFormat(String pattern, Locale aLocale) {
        this(pattern, new DateFormatSymbols(aLocale));
    }

    
Deprecated:
/**
     * @deprecated
     */
    public RubyDateFormat(String pattern, Locale aLocale, boolean ruby_1_9) {
        this(pattern, aLocale);
    }
    
    public RubyDateFormat(String pattern, DateFormatSymbols formatSymbols) {
        super();

        this.formatSymbols = formatSymbols;
        this.compiledPattern = new LinkedList<>();
        applyPattern(pattern);
    }
    
    public void applyPattern(String pattern) {
        applyPattern(pattern, false);
    }
    
    public void applyPattern(String pattern, boolean dateLibrary) {
        compilePattern(pattern, dateLibrary);
    }

    private void compilePattern(String pattern, boolean dateLibrary) {
        compiledPattern.clear();
        
        int len = pattern.length();
        boolean ignoredModifier = false;
        char next;
        for (int i = 0; i < len;) {
            if (pattern.charAt(i) == '%' || (ignoredModifier && !(ignoredModifier = false))) {
                i++;

                if (i == len) {
                    compiledPattern.add(new Token(FORMAT_STRING, "%"));
                } else {
                    i = addOutputFormatter(pattern, i);

                    switch (pattern.charAt(i)) {
                    case 'A' :
                        compiledPattern.add(new Token(FORMAT_WEEK_LONG));
                        break;
                    case 'a' :
                        compiledPattern.add(new Token(FORMAT_WEEK_SHORT));
                        break;
                    case 'B' :
                        compiledPattern.add(new Token(FORMAT_MONTH_LONG));
                        break;
                    case 'b' :
                    case 'h' :
                        compiledPattern.add(new Token(FORMAT_MONTH_SHORT));
                        break;
                    case 'C' :
                        compiledPattern.add(new Token(FORMAT_CENTURY));
                        break;
                    case 'c' :
                        compiledPattern.add(new Token(FORMAT_WEEK_SHORT));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_MONTH_SHORT));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_DAY_S));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_HOUR));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_SECONDS));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_YEAR_LONG));
                        break;
                    case 'D':
                        compiledPattern.add(new Token(FORMAT_MONTH));
                        compiledPattern.add(new Token(FORMAT_STRING, "/"));
                        compiledPattern.add(new Token(FORMAT_DAY));
                        compiledPattern.add(new Token(FORMAT_STRING, "/"));
                        compiledPattern.add(new Token(FORMAT_YEAR_SHORT));
                        break;
                    case 'd':
                        compiledPattern.add(new Token(FORMAT_DAY));
                        break;
                    case 'E':
                        next = '\0';
                        if (i + 1 < len)
                            next = pattern.charAt(i+1);
                        switch (next) {
                            case 'c': case 'C': case 'x': case 'X': case 'y': case 'Y':
                                ignoredModifier = true;
                                i--;
                                break;
                            default:
                                compiledPattern.add(new Token(FORMAT_STRING, "%E"));
                                break;
                        }
                        break;
                    case 'e':
                        compiledPattern.add(new Token(FORMAT_DAY_S));
                        break;
                    case 'F':
                        compiledPattern.add(new Token(FORMAT_YEAR_LONG));
                        compiledPattern.add(new Token(FORMAT_STRING, "-"));
                        compiledPattern.add(new Token(FORMAT_MONTH));
                        compiledPattern.add(new Token(FORMAT_STRING, "-"));
                        compiledPattern.add(new Token(FORMAT_DAY));
                        break;
                    case 'G':
                        compiledPattern.add(new Token(FORMAT_WEEKYEAR));
                        break;
                    case 'g':
                        compiledPattern.add(new Token(FORMAT_WEEKYEAR_SHORT));
                        break;
                    case 'H':
                        compiledPattern.add(new Token(FORMAT_HOUR));
                        break;
                    case 'I':
                        compiledPattern.add(new Token(FORMAT_HOUR_M));
                        break;
                    case 'j':
                        compiledPattern.add(new Token(FORMAT_DAY_YEAR));
                        break;
                    case 'k':
                        compiledPattern.add(new Token(FORMAT_HOUR_BLANK));
                        break;
                    case 'L':
                        compiledPattern.add(new Token(FORMAT_MILLISEC));
                        break;
                    case 'l':
                        compiledPattern.add(new Token(FORMAT_HOUR_S));
                        break;
                    case 'M':
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        break;
                    case 'm':
                        compiledPattern.add(new Token(FORMAT_MONTH));
                        break;
                    case 'N':
                        compiledPattern.add(new Token(FORMAT_NANOSEC));
                        break;
                    case 'n':
                        compiledPattern.add(new Token(FORMAT_STRING, "\n"));
                        break;
                    case 'O':
                        next = '\0';
                        if (i + 1 < len)
                            next = pattern.charAt(i+1);
                        switch (next) {
                            case 'd': case 'e': case 'H': case 'k': case 'I': case 'l': case 'm':
                            case 'M': case 'S': case 'u': case 'U': case 'V': case 'w': case 'W':
                            case 'y':
                                ignoredModifier = true;
                                i--;
                                break;
                            default:
                                compiledPattern.add(new Token(FORMAT_STRING, "%O"));
                                break;
                        }
                        break;
                    case 'p':
                        compiledPattern.add(new Token(FORMAT_MERIDIAN));
                        break;
                    case 'P':
                        compiledPattern.add(new Token(FORMAT_MERIDIAN_LOWER_CASE));
                        break;
                    case 'Q':
                        if (dateLibrary)
                            compiledPattern.add(new Token(FORMAT_MICROSEC_EPOCH));
                        else
                            compiledPattern.add(new Token(FORMAT_STRING, "%Q"));
                        break;
                    case 'R':
                        compiledPattern.add(new Token(FORMAT_HOUR));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        break;
                    case 'r':
                        compiledPattern.add(new Token(FORMAT_HOUR_M));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_SECONDS));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_MERIDIAN));
                        break;
                    case 's':
                        compiledPattern.add(new Token(FORMAT_EPOCH));
                        break;
                    case 'S':
                        compiledPattern.add(new Token(FORMAT_SECONDS));
                        break;
                    case 'T':
                        compiledPattern.add(new Token(FORMAT_HOUR));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_SECONDS));
                        break;
                    case 't':
                        compiledPattern.add(new Token(FORMAT_STRING,"\t"));
                        break;
                    case 'u':
                        compiledPattern.add(new Token(FORMAT_DAY_WEEK2));
                        break;
                    case 'U':
                        compiledPattern.add(new Token(FORMAT_WEEK_YEAR_S));
                        break;
                    case 'v':
                        compiledPattern.add(new Token(FORMAT_DAY_S));
                        compiledPattern.add(new Token(FORMAT_STRING, "-"));
                        if (!dateLibrary)
                            compiledPattern.add(new Token(FORMAT_OUTPUT, new TimeOutputFormatter("^", 0)));
                        compiledPattern.add(new Token(FORMAT_MONTH_SHORT));
                        compiledPattern.add(new Token(FORMAT_STRING, "-"));
                        compiledPattern.add(new Token(FORMAT_YEAR_LONG));
                        break;
                    case 'V':
                        compiledPattern.add(new Token(FORMAT_WEEK_WEEKYEAR));
                        break;
                    case 'W':
                        compiledPattern.add(new Token(FORMAT_WEEK_YEAR_M));
                        break;
                    case 'w':
                        compiledPattern.add(new Token(FORMAT_DAY_WEEK));
                        break;
                    case 'X':
                        compiledPattern.add(new Token(FORMAT_HOUR));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_SECONDS));
                        break;
                    case 'x':
                        compiledPattern.add(new Token(FORMAT_MONTH));
                        compiledPattern.add(new Token(FORMAT_STRING, "/"));
                        compiledPattern.add(new Token(FORMAT_DAY));
                        compiledPattern.add(new Token(FORMAT_STRING, "/"));
                        compiledPattern.add(new Token(FORMAT_YEAR_SHORT));
                        break;
                    case 'Y':
                        compiledPattern.add(new Token(FORMAT_YEAR_LONG));
                        break;
                    case 'y':
                        compiledPattern.add(new Token(FORMAT_YEAR_SHORT));
                        break;
                    case 'Z':
                        if (dateLibrary) {
                            // +HH:MM in 'date', never zone name
                            compiledPattern.add(new Token(FORMAT_OUTPUT, new TimeOutputFormatter(":", 0)));
                            compiledPattern.add(new Token(FORMAT_COLON_ZONE_OFF));
                        } else {
                            compiledPattern.add(new Token(FORMAT_ZONE_ID));
                        }
                        break;
                    case 'z':
                        compiledPattern.add(new Token(FORMAT_COLON_ZONE_OFF));
                        break;
                    case '+':
                        if (!dateLibrary) {
                            compiledPattern.add(new Token(FORMAT_STRING, "%+"));
                            break;
                        }
                        // %a %b %e %H:%M:%S %Z %Y
                        compiledPattern.add(new Token(FORMAT_WEEK_SHORT));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_MONTH_SHORT));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_DAY_S));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_HOUR));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_MINUTES));
                        compiledPattern.add(new Token(FORMAT_STRING, ":"));
                        compiledPattern.add(new Token(FORMAT_SECONDS));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        // %Z: +HH:MM in 'date', never zone name
                        compiledPattern.add(new Token(FORMAT_OUTPUT, new TimeOutputFormatter(":", 0)));
                        compiledPattern.add(new Token(FORMAT_COLON_ZONE_OFF));
                        compiledPattern.add(new Token(FORMAT_STRING, " "));
                        compiledPattern.add(new Token(FORMAT_YEAR_LONG));
                        break;
                    case '%':
                        compiledPattern.add(new Token(FORMAT_STRING, "%"));
                        break;
                    default:
                        compiledPattern.add(new Token(FORMAT_STRING, "%" + pattern.charAt(i)));
                    }
                    i++;
                }
            } else {
                StringBuilder sb = new StringBuilder();
                for (;i < len && pattern.charAt(i) != '%'; i++) {
                    sb.append(pattern.charAt(i));
                }
                compiledPattern.add(new Token(FORMAT_STRING, sb.toString()));
            }
        }
    }

    private int addOutputFormatter(String pattern, int index) {
        TimeOutputFormatter outputFormatter = TimeOutputFormatter.getFormatter(pattern.substring(index - 1));
        if (outputFormatter != null) {
            index += outputFormatter.getFormat().length();
            compiledPattern.add(new Token(FORMAT_OUTPUT, outputFormatter));
        }
        return index;
    }

    private DateTime dt;
    private long nsec;

    public void setDateTime(final DateTime dt) {
        this.dt = dt;
    }

    public void setNSec(long nsec) {
        this.nsec = nsec;
    }

    static enum FieldType {
        NUMERIC('0', 0),
        NUMERIC2('0', 2),
        NUMERIC2BLANK(' ', 2),
        NUMERIC3('0', 3),
        NUMERIC4('0', 4),
        NUMERIC5('0', 5),
        TEXT(' ', 0);

        char defaultPadder;
        int defaultWidth;
        FieldType(char padder, int width) {
            defaultPadder = padder;
            defaultWidth = width;
        }
    }

    
See Also:
  • format.format(Date, StringBuffer, FieldPosition)
/**
     * @see DateFormat#format(Date, StringBuffer, FieldPosition)
     */
    public StringBuffer format(Date ignored, StringBuffer toAppendTo, FieldPosition fieldPosition) {
        TimeOutputFormatter formatter = TimeOutputFormatter.DEFAULT_FORMATTER;

        for (Token token: compiledPattern) {
            String output = null;
            long value = 0;
            FieldType type = TEXT;
            int format = token.getFormat();

            switch (format) {
                case FORMAT_OUTPUT:
                    formatter = (TimeOutputFormatter) token.getData();
                    continue; // go to next token
                case FORMAT_STRING:
                    output = token.getData().toString();
                    break;
                case FORMAT_WEEK_LONG:
                    // This is GROSS, but Java API's aren't ISO 8601 compliant at all
                    int v = (dt.getDayOfWeek()+1)%8;
                    if(v == 0) {
                        v++;
                    }
                    output = formatSymbols.getWeekdays()[v];
                    break;
                case FORMAT_WEEK_SHORT:
                    // This is GROSS, but Java API's aren't ISO 8601 compliant at all
                    v = (dt.getDayOfWeek()+1)%8;
                    if(v == 0) {
                        v++;
                    }
                    output = formatSymbols.getShortWeekdays()[v];
                    break;
                case FORMAT_MONTH_LONG:
                    output = formatSymbols.getMonths()[dt.getMonthOfYear()-1];
                    break;
                case FORMAT_MONTH_SHORT:
                    output = formatSymbols.getShortMonths()[dt.getMonthOfYear()-1];
                    break;
                case FORMAT_DAY:
                    type = NUMERIC2;
                    value = dt.getDayOfMonth();
                    break;
                case FORMAT_DAY_S:
                    type = NUMERIC2BLANK;
                    value = dt.getDayOfMonth();
                    break;
                case FORMAT_HOUR:
                    type = NUMERIC2;
                    value = dt.getHourOfDay();
                    break;
                case FORMAT_HOUR_BLANK:
                    type = NUMERIC2BLANK;
                    value = dt.getHourOfDay();
                    break;
                case FORMAT_HOUR_M:
                case FORMAT_HOUR_S:
                    value = dt.getHourOfDay();
                    if (value == 0) {
                        value = 12;
                    } else if (value > 12) {
                        value -= 12;
                    }

                    type = (format == FORMAT_HOUR_M) ? NUMERIC2 : NUMERIC2BLANK;
                    break;
                case FORMAT_DAY_YEAR:
                    type = NUMERIC3;
                    value = dt.getDayOfYear();
                    break;
                case FORMAT_MINUTES:
                    type = NUMERIC2;
                    value = dt.getMinuteOfHour();
                    break;
                case FORMAT_MONTH:
                    type = NUMERIC2;
                    value = dt.getMonthOfYear();
                    break;
                case FORMAT_MERIDIAN:
                    output = dt.getHourOfDay() < 12 ? "AM" : "PM";
                    break;
                case FORMAT_MERIDIAN_LOWER_CASE:
                    output = dt.getHourOfDay() < 12 ? "am" : "pm";
                    break;
                case FORMAT_SECONDS:
                    type = NUMERIC2;
                    value = dt.getSecondOfMinute();
                    break;
                case FORMAT_WEEK_YEAR_M:
                    type = NUMERIC2;
                    value = formatWeekYear(java.util.Calendar.MONDAY);
                    break;
                case FORMAT_WEEK_YEAR_S:
                    type = NUMERIC2;
                    value = formatWeekYear(java.util.Calendar.SUNDAY);
                    break;
                case FORMAT_DAY_WEEK:
                    type = NUMERIC;
                    value = dt.getDayOfWeek() % 7;
                    break;
                case FORMAT_DAY_WEEK2:
                    type = NUMERIC;
                    value = dt.getDayOfWeek();
                    break;
                case FORMAT_YEAR_LONG:
                    value = year(dt.getYear());
                    type = (value >= 0) ? NUMERIC4 : NUMERIC5;
                    break;
                case FORMAT_YEAR_SHORT:
                    type = NUMERIC2;
                    value = year(dt.getYear()) % 100;
                    break;
                case FORMAT_COLON_ZONE_OFF:
                    // custom logic because this is so weird
                    value = dt.getZone().getOffset(dt.getMillis()) / 1000;
                    int colons = formatter.getNumberOfColons();
                    output = formatZone(colons, (int) value, formatter);
                    break;
                case FORMAT_ZONE_ID:
                    output = dt.getZone().getShortName(dt.getMillis());
                    break;
                case FORMAT_CENTURY:
                    type = NUMERIC;
                    value = year(dt.getYear()) / 100;
                    break;
                case FORMAT_EPOCH:
                    type = NUMERIC;
                    value = dt.getMillis() / 1000;
                    break;
                case FORMAT_WEEK_WEEKYEAR:
                    type = NUMERIC2;
                    value = dt.getWeekOfWeekyear();
                    break;
                case FORMAT_MILLISEC:
                case FORMAT_NANOSEC:
                    value = dt.getMillisOfSecond() * 1000000L + nsec;
                    output = TimeOutputFormatter.formatNumber(value, 9, '0');

                    int defaultWidth = (format == FORMAT_NANOSEC) ? 9 : 3;
                    int width = formatter.getWidth(defaultWidth);
                    if (width < 9) {
                        output = output.substring(0, width);
                    } else {
                        while(output.length() < width)
                            output += "0";
                    }
                    formatter = TimeOutputFormatter.DEFAULT_FORMATTER; // no more formatting
                    break;
                case FORMAT_WEEKYEAR:
                    value = year(dt.getWeekyear());
                    type = (value >= 0) ? NUMERIC4 : NUMERIC5;
                    break;
                case FORMAT_WEEKYEAR_SHORT:
                    type = NUMERIC2;
                    value = year(dt.getWeekyear()) % 100;
                    break;
                case FORMAT_MICROSEC_EPOCH:
                    // only available for Date
                    type = NUMERIC;
                    value = dt.getMillis();
                    break;
            }

            output = formatter.format(output, value, type);
            // reset formatter
            formatter = TimeOutputFormatter.DEFAULT_FORMATTER;
            toAppendTo.append(output);
        }

        return toAppendTo;
    }

    
Ruby always follows Astronomical year numbering,
that is BC x is -x+1 and there is a year 0 (BC 1)
but Joda-time returns -x for year x BC in Julian chronology (no year 0) 
/**
     * Ruby always follows Astronomical year numbering,
     * that is BC x is -x+1 and there is a year 0 (BC 1)
     * but Joda-time returns -x for year x BC in Julian chronology (no year 0) */
    private int year(int year) {
        Chronology c;
        if (year < 0 && (
                (c = dt.getChronology()) instanceof JulianChronology ||
                (c instanceof GJChronology && ((GJChronology) c).getGregorianCutover().isAfter(dt))))
            return year + 1;
        return year;
    }

    private int formatWeekYear(int firstDayOfWeek) {
        java.util.Calendar dtCalendar = dt.toGregorianCalendar();
        dtCalendar.setFirstDayOfWeek(firstDayOfWeek);
        dtCalendar.setMinimalDaysInFirstWeek(7);
        int value = dtCalendar.get(java.util.Calendar.WEEK_OF_YEAR);
        if ((value == 52 || value == 53) &&
                (dtCalendar.get(Calendar.MONTH) == Calendar.JANUARY )) {
            // MRI behavior: Week values are monotonous.
            // So, weeks that effectively belong to previous year,
            // will get the value of 0, not 52 or 53, as in Java.
            value = 0;
        }
        return value;
    }

    private String formatZone(int colons, int value, TimeOutputFormatter formatter) {
        int seconds = Math.abs(value);
        int hours = seconds / 3600;
        seconds %= 3600;
        int minutes = seconds / 60;
        seconds %= 60;

        if (value < 0 && hours != 0) { // see below when hours == 0
            hours = -hours;
        }

        String mm = TimeOutputFormatter.formatNumber(minutes, 2, '0');
        String ss = TimeOutputFormatter.formatNumber(seconds, 2, '0');

        char padder = formatter.getPadder('0');
        int defaultWidth = -1;
        String after = null;

        switch (colons) {
            case 0: // %z -> +hhmm
                defaultWidth = 5;
                after = mm;
                break;
            case 1: // %:z -> +hh:mm
                defaultWidth = 6;
                after = ":" + mm;
                break;
            case 2: // %::z -> +hh:mm:ss
                defaultWidth = 9;
                after = ":" + mm + ":" + ss;
                break;
            case 3: // %:::z -> +hh[:mm[:ss]]
                if (minutes == 0) {
                    if (seconds == 0) { // +hh
                        defaultWidth = 3;
                        after = "";
                    } else { // +hh:mm
                        return formatZone(1, value, formatter);
                    }
                } else { // +hh:mm:ss
                    return formatZone(2, value, formatter);
                }
                break;
        }

        int minWidth = defaultWidth - 1;
        int width = formatter.getWidth(defaultWidth);
        if (width < minWidth) {
            width = minWidth;
        }
        width -= after.length();
        String before = TimeOutputFormatter.formatSignedNumber(hours, width, padder);

        if (value < 0 && hours == 0) // the formatter could not handle this case
            before = before.replace('+', '-');
        return before + after;
    }

    
See Also:
  • parse.parse(String, ParsePosition)
/**
     * @see DateFormat#parse(String, ParsePosition)
     */
    public Date parse(String source, ParsePosition pos) {
        throw new UnsupportedOperationException();
    }
}