Java tutorial
/* * Copyright (c) 1996, 2019, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved * (C) Copyright IBM Corp. 1996-1998 - All Rights Reserved * * The original version of this source code and documentation is copyrighted * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These * materials are provided under terms of a License Agreement between Taligent * and Sun. This technology is protected by multiple US and International * patents. This notice and attribution to Taligent may not be removed. * Taligent is a registered trademark of Taligent, Inc. * */ package java.text; import java.io.IOException; import java.io.InvalidObjectException; import java.io.ObjectInputStream; import static java.text.DateFormatSymbols.*; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.Locale; import java.util.Map; import java.util.SimpleTimeZone; import java.util.SortedMap; import java.util.TimeZone; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import sun.util.calendar.CalendarUtils; import sun.util.calendar.ZoneInfoFile; import sun.util.locale.provider.LocaleProviderAdapter; import sun.util.locale.provider.TimeZoneNameUtility; /** * <code>SimpleDateFormat</code> is a concrete class for formatting and * parsing dates in a locale-sensitive manner. It allows for formatting * (date → text), parsing (text → date), and normalization. * * <p> * <code>SimpleDateFormat</code> allows you to start by choosing * any user-defined patterns for date-time formatting. However, you * are encouraged to create a date-time formatter with either * <code>getTimeInstance</code>, <code>getDateInstance</code>, or * <code>getDateTimeInstance</code> in <code>DateFormat</code>. Each * of these class methods can return a date/time formatter initialized * with a default format pattern. You may modify the format pattern * using the <code>applyPattern</code> methods as desired. * For more information on using these methods, see * {@link DateFormat}. * * <h2>Date and Time Patterns</h2> * <p> * Date and time formats are specified by <em>date and time pattern</em> * strings. * Within date and time pattern strings, unquoted letters from * <code>'A'</code> to <code>'Z'</code> and from <code>'a'</code> to * <code>'z'</code> are interpreted as pattern letters representing the * components of a date or time string. * Text can be quoted using single quotes (<code>'</code>) to avoid * interpretation. * <code>"''"</code> represents a single quote. * All other characters are not interpreted; they're simply copied into the * output string during formatting or matched against the input string * during parsing. * <p> * The following pattern letters are defined (all other characters from * <code>'A'</code> to <code>'Z'</code> and from <code>'a'</code> to * <code>'z'</code> are reserved): * <blockquote> * <table class="striped"> * <caption style="display:none">Chart shows pattern letters, date/time component, presentation, and examples.</caption> * <thead> * <tr> * <th scope="col" style="text-align:left">Letter * <th scope="col" style="text-align:left">Date or Time Component * <th scope="col" style="text-align:left">Presentation * <th scope="col" style="text-align:left">Examples * </thead> * <tbody> * <tr> * <th scope="row"><code>G</code> * <td>Era designator * <td><a href="#text">Text</a> * <td><code>AD</code> * <tr> * <th scope="row"><code>y</code> * <td>Year * <td><a href="#year">Year</a> * <td><code>1996</code>; <code>96</code> * <tr> * <th scope="row"><code>Y</code> * <td>Week year * <td><a href="#year">Year</a> * <td><code>2009</code>; <code>09</code> * <tr> * <th scope="row"><code>M</code> * <td>Month in year (context sensitive) * <td><a href="#month">Month</a> * <td><code>July</code>; <code>Jul</code>; <code>07</code> * <tr> * <th scope="row"><code>L</code> * <td>Month in year (standalone form) * <td><a href="#month">Month</a> * <td><code>July</code>; <code>Jul</code>; <code>07</code> * <tr> * <th scope="row"><code>w</code> * <td>Week in year * <td><a href="#number">Number</a> * <td><code>27</code> * <tr> * <th scope="row"><code>W</code> * <td>Week in month * <td><a href="#number">Number</a> * <td><code>2</code> * <tr> * <th scope="row"><code>D</code> * <td>Day in year * <td><a href="#number">Number</a> * <td><code>189</code> * <tr> * <th scope="row"><code>d</code> * <td>Day in month * <td><a href="#number">Number</a> * <td><code>10</code> * <tr> * <th scope="row"><code>F</code> * <td>Day of week in month * <td><a href="#number">Number</a> * <td><code>2</code> * <tr> * <th scope="row"><code>E</code> * <td>Day name in week * <td><a href="#text">Text</a> * <td><code>Tuesday</code>; <code>Tue</code> * <tr> * <th scope="row"><code>u</code> * <td>Day number of week (1 = Monday, ..., 7 = Sunday) * <td><a href="#number">Number</a> * <td><code>1</code> * <tr> * <th scope="row"><code>a</code> * <td>Am/pm marker * <td><a href="#text">Text</a> * <td><code>PM</code> * <tr> * <th scope="row"><code>H</code> * <td>Hour in day (0-23) * <td><a href="#number">Number</a> * <td><code>0</code> * <tr> * <th scope="row"><code>k</code> * <td>Hour in day (1-24) * <td><a href="#number">Number</a> * <td><code>24</code> * <tr> * <th scope="row"><code>K</code> * <td>Hour in am/pm (0-11) * <td><a href="#number">Number</a> * <td><code>0</code> * <tr> * <th scope="row"><code>h</code> * <td>Hour in am/pm (1-12) * <td><a href="#number">Number</a> * <td><code>12</code> * <tr> * <th scope="row"><code>m</code> * <td>Minute in hour * <td><a href="#number">Number</a> * <td><code>30</code> * <tr> * <th scope="row"><code>s</code> * <td>Second in minute * <td><a href="#number">Number</a> * <td><code>55</code> * <tr> * <th scope="row"><code>S</code> * <td>Millisecond * <td><a href="#number">Number</a> * <td><code>978</code> * <tr> * <th scope="row"><code>z</code> * <td>Time zone * <td><a href="#timezone">General time zone</a> * <td><code>Pacific Standard Time</code>; <code>PST</code>; <code>GMT-08:00</code> * <tr> * <th scope="row"><code>Z</code> * <td>Time zone * <td><a href="#rfc822timezone">RFC 822 time zone</a> * <td><code>-0800</code> * <tr> * <th scope="row"><code>X</code> * <td>Time zone * <td><a href="#iso8601timezone">ISO 8601 time zone</a> * <td><code>-08</code>; <code>-0800</code>; <code>-08:00</code> * </tbody> * </table> * </blockquote> * Pattern letters are usually repeated, as their number determines the * exact presentation: * <ul> * <li><strong><a id="text">Text:</a></strong> * For formatting, if the number of pattern letters is 4 or more, * the full form is used; otherwise a short or abbreviated form * is used if available. * For parsing, both forms are accepted, independent of the number * of pattern letters.<br><br></li> * <li><strong><a id="number">Number:</a></strong> * For formatting, the number of pattern letters is the minimum * number of digits, and shorter numbers are zero-padded to this amount. * For parsing, the number of pattern letters is ignored unless * it's needed to separate two adjacent fields.<br><br></li> * <li><strong><a id="year">Year:</a></strong> * If the formatter's {@link #getCalendar() Calendar} is the Gregorian * calendar, the following rules are applied.<br> * <ul> * <li>For formatting, if the number of pattern letters is 2, the year * is truncated to 2 digits; otherwise it is interpreted as a * <a href="#number">number</a>. * <li>For parsing, if the number of pattern letters is more than 2, * the year is interpreted literally, regardless of the number of * digits. So using the pattern "MM/dd/yyyy", "01/11/12" parses to * Jan 11, 12 A.D. * <li>For parsing with the abbreviated year pattern ("y" or "yy"), * <code>SimpleDateFormat</code> must interpret the abbreviated year * relative to some century. It does this by adjusting dates to be * within 80 years before and 20 years after the time the <code>SimpleDateFormat</code> * instance is created. For example, using a pattern of "MM/dd/yy" and a * <code>SimpleDateFormat</code> instance created on Jan 1, 1997, the string * "01/11/12" would be interpreted as Jan 11, 2012 while the string "05/04/64" * would be interpreted as May 4, 1964. * During parsing, only strings consisting of exactly two digits, as defined by * {@link Character#isDigit(char)}, will be parsed into the default century. * Any other numeric string, such as a one digit string, a three or more digit * string, or a two digit string that isn't all digits (for example, "-1"), is * interpreted literally. So "01/02/3" or "01/02/003" are parsed, using the * same pattern, as Jan 2, 3 AD. Likewise, "01/02/-3" is parsed as Jan 2, 4 BC. * </ul> * Otherwise, calendar system specific forms are applied. * For both formatting and parsing, if the number of pattern * letters is 4 or more, a calendar specific {@linkplain * Calendar#LONG long form} is used. Otherwise, a calendar * specific {@linkplain Calendar#SHORT short or abbreviated form} * is used.<br> * <br> * If week year {@code 'Y'} is specified and the {@linkplain * #getCalendar() calendar} doesn't support any <a * href="../util/GregorianCalendar.html#week_year"> week * years</a>, the calendar year ({@code 'y'}) is used instead. The * support of week years can be tested with a call to {@link * DateFormat#getCalendar() getCalendar()}.{@link * java.util.Calendar#isWeekDateSupported() * isWeekDateSupported()}.<br><br></li> * <li><strong><a id="month">Month:</a></strong> * If the number of pattern letters is 3 or more, the month is * interpreted as <a href="#text">text</a>; otherwise, * it is interpreted as a <a href="#number">number</a>.<br> * <ul> * <li>Letter <em>M</em> produces context-sensitive month names, such as the * embedded form of names. Letter <em>M</em> is context-sensitive in the * sense that when it is used in the standalone pattern, for example, * "MMMM", it gives the standalone form of a month name and when it is * used in the pattern containing other field(s), for example, "d MMMM", * it gives the format form of a month name. For example, January in the * Catalan language is "de gener" in the format form while it is "gener" * in the standalone form. In this case, "MMMM" will produce "gener" and * the month part of the "d MMMM" will produce "de gener". If a * {@code DateFormatSymbols} has been set explicitly with constructor * {@link #SimpleDateFormat(String,DateFormatSymbols)} or method {@link * #setDateFormatSymbols(DateFormatSymbols)}, the month names given by * the {@code DateFormatSymbols} are used.</li> * <li>Letter <em>L</em> produces the standalone form of month names.</li> * </ul> * <br></li> * <li><strong><a id="timezone">General time zone:</a></strong> * Time zones are interpreted as <a href="#text">text</a> if they have * names. For time zones representing a GMT offset value, the * following syntax is used: * <pre> * <a id="GMTOffsetTimeZone"><i>GMTOffsetTimeZone:</i></a> * <code>GMT</code> <i>Sign</i> <i>Hours</i> <code>:</code> <i>Minutes</i> * <i>Sign:</i> one of * <code>+ -</code> * <i>Hours:</i> * <i>Digit</i> * <i>Digit</i> <i>Digit</i> * <i>Minutes:</i> * <i>Digit</i> <i>Digit</i> * <i>Digit:</i> one of * <code>0 1 2 3 4 5 6 7 8 9</code></pre> * <i>Hours</i> must be between 0 and 23, and <i>Minutes</i> must be between * 00 and 59. The format is locale independent and digits must be taken * from the Basic Latin block of the Unicode standard. * <p>For parsing, <a href="#rfc822timezone">RFC 822 time zones</a> are also * accepted.<br><br></li> * <li><strong><a id="rfc822timezone">RFC 822 time zone:</a></strong> * For formatting, the RFC 822 4-digit time zone format is used: * * <pre> * <i>RFC822TimeZone:</i> * <i>Sign</i> <i>TwoDigitHours</i> <i>Minutes</i> * <i>TwoDigitHours:</i> * <i>Digit Digit</i></pre> * <i>TwoDigitHours</i> must be between 00 and 23. Other definitions * are as for <a href="#timezone">general time zones</a>. * * <p>For parsing, <a href="#timezone">general time zones</a> are also * accepted. * <li><strong><a id="iso8601timezone">ISO 8601 Time zone:</a></strong> * The number of pattern letters designates the format for both formatting * and parsing as follows: * <pre> * <i>ISO8601TimeZone:</i> * <i>OneLetterISO8601TimeZone</i> * <i>TwoLetterISO8601TimeZone</i> * <i>ThreeLetterISO8601TimeZone</i> * <i>OneLetterISO8601TimeZone:</i> * <i>Sign</i> <i>TwoDigitHours</i> * {@code Z} * <i>TwoLetterISO8601TimeZone:</i> * <i>Sign</i> <i>TwoDigitHours</i> <i>Minutes</i> * {@code Z} * <i>ThreeLetterISO8601TimeZone:</i> * <i>Sign</i> <i>TwoDigitHours</i> {@code :} <i>Minutes</i> * {@code Z}</pre> * Other definitions are as for <a href="#timezone">general time zones</a> or * <a href="#rfc822timezone">RFC 822 time zones</a>. * * <p>For formatting, if the offset value from GMT is 0, {@code "Z"} is * produced. If the number of pattern letters is 1, any fraction of an hour * is ignored. For example, if the pattern is {@code "X"} and the time zone is * {@code "GMT+05:30"}, {@code "+05"} is produced. * * <p>For parsing, {@code "Z"} is parsed as the UTC time zone designator. * <a href="#timezone">General time zones</a> are <em>not</em> accepted. * * <p>If the number of pattern letters is 4 or more, {@link * IllegalArgumentException} is thrown when constructing a {@code * SimpleDateFormat} or {@linkplain #applyPattern(String) applying a * pattern}. * </ul> * <code>SimpleDateFormat</code> also supports <em>localized date and time * pattern</em> strings. In these strings, the pattern letters described above * may be replaced with other, locale dependent, pattern letters. * <code>SimpleDateFormat</code> does not deal with the localization of text * other than the pattern letters; that's up to the client of the class. * * <h3>Examples</h3> * * The following examples show how date and time patterns are interpreted in * the U.S. locale. The given date and time are 2001-07-04 12:08:56 local time * in the U.S. Pacific Time time zone. * <blockquote> * <table class="striped"> * <caption style="display:none">Examples of date and time patterns interpreted in the U.S. locale</caption> * <thead> * <tr> * <th scope="col" style="text-align:left">Date and Time Pattern * <th scope="col" style="text-align:left">Result * </thead> * <tbody> * <tr> * <th scope="row"><code>"yyyy.MM.dd G 'at' HH:mm:ss z"</code> * <td><code>2001.07.04 AD at 12:08:56 PDT</code> * <tr> * <th scope="row"><code>"EEE, MMM d, ''yy"</code> * <td><code>Wed, Jul 4, '01</code> * <tr> * <th scope="row"><code>"h:mm a"</code> * <td><code>12:08 PM</code> * <tr> * <th scope="row"><code>"hh 'o''clock' a, zzzz"</code> * <td><code>12 o'clock PM, Pacific Daylight Time</code> * <tr> * <th scope="row"><code>"K:mm a, z"</code> * <td><code>0:08 PM, PDT</code> * <tr> * <th scope="row"><code>"yyyyy.MMMMM.dd GGG hh:mm aaa"</code> * <td><code>02001.July.04 AD 12:08 PM</code> * <tr> * <th scope="row"><code>"EEE, d MMM yyyy HH:mm:ss Z"</code> * <td><code>Wed, 4 Jul 2001 12:08:56 -0700</code> * <tr> * <th scope="row"><code>"yyMMddHHmmssZ"</code> * <td><code>010704120856-0700</code> * <tr> * <th scope="row"><code>"yyyy-MM-dd'T'HH:mm:ss.SSSZ"</code> * <td><code>2001-07-04T12:08:56.235-0700</code> * <tr> * <th scope="row"><code>"yyyy-MM-dd'T'HH:mm:ss.SSSXXX"</code> * <td><code>2001-07-04T12:08:56.235-07:00</code> * <tr> * <th scope="row"><code>"YYYY-'W'ww-u"</code> * <td><code>2001-W27-3</code> * </tbody> * </table> * </blockquote> * * <h3><a id="synchronization">Synchronization</a></h3> * * <p> * Date formats are not synchronized. * It is recommended to create separate format instances for each thread. * If multiple threads access a format concurrently, it must be synchronized * externally. * * @see <a href="http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html">Java Tutorial</a> * @see java.util.Calendar * @see java.util.TimeZone * @see DateFormat * @see DateFormatSymbols * @author Mark Davis, Chen-Lieh Huang, Alan Liu * @since 1.1 */ public class SimpleDateFormat extends DateFormat { // the official serial version ID which says cryptically // which version we're compatible with static final long serialVersionUID = 4774881970558875024L; // the internal serial version which says which version was written // - 0 (default) for version up to JDK 1.1.3 // - 1 for version from JDK 1.1.4, which includes a new field static final int currentSerialVersion = 1; /** * The version of the serialized data on the stream. Possible values: * <ul> * <li><b>0</b> or not present on stream: JDK 1.1.3. This version * has no <code>defaultCenturyStart</code> on stream. * <li><b>1</b> JDK 1.1.4 or later. This version adds * <code>defaultCenturyStart</code>. * </ul> * When streaming out this class, the most recent format * and the highest allowable <code>serialVersionOnStream</code> * is written. * @serial * @since 1.1.4 */ private int serialVersionOnStream = currentSerialVersion; /** * The pattern string of this formatter. This is always a non-localized * pattern. May not be null. See class documentation for details. * @serial */ private String pattern; /** * Saved numberFormat and pattern. * @see SimpleDateFormat#checkNegativeNumberExpression */ private transient NumberFormat originalNumberFormat; private transient String originalNumberPattern; /** * The minus sign to be used with format and parse. */ private transient char minusSign = '-'; /** * True when a negative sign follows a number. * (True as default in Arabic.) */ private transient boolean hasFollowingMinusSign = false; /** * True if standalone form needs to be used. */ private transient boolean forceStandaloneForm = false; /** * The compiled pattern. */ private transient char[] compiledPattern; /** * Tags for the compiled pattern. */ private static final int TAG_QUOTE_ASCII_CHAR = 100; private static final int TAG_QUOTE_CHARS = 101; /** * Locale dependent digit zero. * @see #zeroPaddingNumber * @see java.text.DecimalFormatSymbols#getZeroDigit */ private transient char zeroDigit; /** * The symbols used by this formatter for week names, month names, * etc. May not be null. * @serial * @see java.text.DateFormatSymbols */ private DateFormatSymbols formatData; /** * We map dates with two-digit years into the century starting at * <code>defaultCenturyStart</code>, which may be any date. May * not be null. * @serial * @since 1.1.4 */ private Date defaultCenturyStart; private transient int defaultCenturyStartYear; private static final int MILLIS_PER_MINUTE = 60 * 1000; // For time zones that have no names, use strings GMT+minutes and // GMT-minutes. For instance, in France the time zone is GMT+60. private static final String GMT = "GMT"; /** * Cache NumberFormat instances with Locale key. */ private static final ConcurrentMap<Locale, NumberFormat> cachedNumberFormatData = new ConcurrentHashMap<>(3); /** * The Locale used to instantiate this * <code>SimpleDateFormat</code>. The value may be null if this object * has been created by an older <code>SimpleDateFormat</code> and * deserialized. * * @serial * @since 1.6 */ private Locale locale; /** * Indicates whether this <code>SimpleDateFormat</code> should use * the DateFormatSymbols. If true, the format and parse methods * use the DateFormatSymbols values. If false, the format and * parse methods call Calendar.getDisplayName or * Calendar.getDisplayNames. */ transient boolean useDateFormatSymbols; /** * Constructs a <code>SimpleDateFormat</code> using the default pattern and * date format symbols for the default * {@link java.util.Locale.Category#FORMAT FORMAT} locale. * <b>Note:</b> This constructor may not support all locales. * For full coverage, use the factory methods in the {@link DateFormat} * class. */ public SimpleDateFormat() { this("", Locale.getDefault(Locale.Category.FORMAT)); applyPatternImpl(LocaleProviderAdapter.getResourceBundleBased().getLocaleResources(locale) .getDateTimePattern(SHORT, SHORT, calendar)); } /** * Constructs a <code>SimpleDateFormat</code> using the given pattern and * the default date format symbols for the default * {@link java.util.Locale.Category#FORMAT FORMAT} locale. * <b>Note:</b> This constructor may not support all locales. * For full coverage, use the factory methods in the {@link DateFormat} * class. * <p>This is equivalent to calling * {@link #SimpleDateFormat(String, Locale) * SimpleDateFormat(pattern, Locale.getDefault(Locale.Category.FORMAT))}. * * @see java.util.Locale#getDefault(java.util.Locale.Category) * @see java.util.Locale.Category#FORMAT * @param pattern the pattern describing the date and time format * @exception NullPointerException if the given pattern is null * @exception IllegalArgumentException if the given pattern is invalid */ public SimpleDateFormat(String pattern) { this(pattern, Locale.getDefault(Locale.Category.FORMAT)); } /** * Constructs a <code>SimpleDateFormat</code> using the given pattern and * the default date format symbols for the given locale. * <b>Note:</b> This constructor may not support all locales. * For full coverage, use the factory methods in the {@link DateFormat} * class. * * @param pattern the pattern describing the date and time format * @param locale the locale whose date format symbols should be used * @exception NullPointerException if the given pattern or locale is null * @exception IllegalArgumentException if the given pattern is invalid */ public SimpleDateFormat(String pattern, Locale locale) { if (pattern == null || locale == null) { throw new NullPointerException(); } initializeCalendar(locale); this.pattern = pattern; this.formatData = DateFormatSymbols.getInstanceRef(locale); this.locale = locale; initialize(locale); } /** * Constructs a <code>SimpleDateFormat</code> using the given pattern and * date format symbols. * * @param pattern the pattern describing the date and time format * @param formatSymbols the date format symbols to be used for formatting * @exception NullPointerException if the given pattern or formatSymbols is null * @exception IllegalArgumentException if the given pattern is invalid */ public SimpleDateFormat(String pattern, DateFormatSymbols formatSymbols) { if (pattern == null || formatSymbols == null) { throw new NullPointerException(); } this.pattern = pattern; this.formatData = (DateFormatSymbols) formatSymbols.clone(); this.locale = Locale.getDefault(Locale.Category.FORMAT); initializeCalendar(this.locale); initialize(this.locale); useDateFormatSymbols = true; } /* Initialize compiledPattern and numberFormat fields */ private void initialize(Locale loc) { // Verify and compile the given pattern. compiledPattern = compile(pattern); /* try the cache first */ numberFormat = cachedNumberFormatData.get(loc); if (numberFormat == null) { /* cache miss */ numberFormat = NumberFormat.getIntegerInstance(loc); numberFormat.setGroupingUsed(false); /* update cache */ cachedNumberFormatData.putIfAbsent(loc, numberFormat); } numberFormat = (NumberFormat) numberFormat.clone(); initializeDefaultCentury(); } private void initializeCalendar(Locale loc) { if (calendar == null) { assert loc != null; // The format object must be constructed using the symbols for this zone. // However, the calendar should use the current default TimeZone. // If this is not contained in the locale zone strings, then the zone // will be formatted using generic GMT+/-H:MM nomenclature. calendar = Calendar.getInstance(loc); } } /** * Returns the compiled form of the given pattern. The syntax of * the compiled pattern is: * <blockquote> * CompiledPattern: * EntryList * EntryList: * Entry * EntryList Entry * Entry: * TagField * TagField data * TagField: * Tag Length * TaggedData * Tag: * pattern_char_index * TAG_QUOTE_CHARS * Length: * short_length * long_length * TaggedData: * TAG_QUOTE_ASCII_CHAR ascii_char * * </blockquote> * * where `short_length' is an 8-bit unsigned integer between 0 and * 254. `long_length' is a sequence of an 8-bit integer 255 and a * 32-bit signed integer value which is split into upper and lower * 16-bit fields in two char's. `pattern_char_index' is an 8-bit * integer between 0 and 18. `ascii_char' is an 7-bit ASCII * character value. `data' depends on its Tag value. * <p> * If Length is short_length, Tag and short_length are packed in a * single char, as illustrated below. * <blockquote> * char[0] = (Tag << 8) | short_length; * </blockquote> * * If Length is long_length, Tag and 255 are packed in the first * char and a 32-bit integer, as illustrated below. * <blockquote> * char[0] = (Tag << 8) | 255; * char[1] = (char) (long_length >>> 16); * char[2] = (char) (long_length & 0xffff); * </blockquote> * <p> * If Tag is a pattern_char_index, its Length is the number of * pattern characters. For example, if the given pattern is * "yyyy", Tag is 1 and Length is 4, followed by no data. * <p> * If Tag is TAG_QUOTE_CHARS, its Length is the number of char's * following the TagField. For example, if the given pattern is * "'o''clock'", Length is 7 followed by a char sequence of * <code>o&nbs;'&nbs;c&nbs;l&nbs;o&nbs;c&nbs;k</code>. * <p> * TAG_QUOTE_ASCII_CHAR is a special tag and has an ASCII * character in place of Length. For example, if the given pattern * is "'o'", the TaggedData entry is * <code>((TAG_QUOTE_ASCII_CHAR&nbs;<<&nbs;8)&nbs;|&nbs;'o')</code>. * * @exception NullPointerException if the given pattern is null * @exception IllegalArgumentException if the given pattern is invalid */ private char[] compile(String pattern) { int length = pattern.length(); boolean inQuote = false; StringBuilder compiledCode = new StringBuilder(length * 2); StringBuilder tmpBuffer = null; int count = 0, tagcount = 0; int lastTag = -1, prevTag = -1; for (int i = 0; i < length; i++) { char c = pattern.charAt(i); if (c == '\'') { // '' is treated as a single quote regardless of being // in a quoted section. if ((i + 1) < length) { c = pattern.charAt(i + 1); if (c == '\'') { i++; if (count != 0) { encode(lastTag, count, compiledCode); tagcount++; prevTag = lastTag; lastTag = -1; count = 0; } if (inQuote) { tmpBuffer.append(c); } else { compiledCode.append((char) (TAG_QUOTE_ASCII_CHAR << 8 | c)); } continue; } } if (!inQuote) { if (count != 0) { encode(lastTag, count, compiledCode); tagcount++; prevTag = lastTag; lastTag = -1; count = 0; } if (tmpBuffer == null) { tmpBuffer = new StringBuilder(length); } else { tmpBuffer.setLength(0); } inQuote = true; } else { int len = tmpBuffer.length(); if (len == 1) { char ch = tmpBuffer.charAt(0); if (ch < 128) { compiledCode.append((char) (TAG_QUOTE_ASCII_CHAR << 8 | ch)); } else { compiledCode.append((char) (TAG_QUOTE_CHARS << 8 | 1)); compiledCode.append(ch); } } else { encode(TAG_QUOTE_CHARS, len, compiledCode); compiledCode.append(tmpBuffer); } inQuote = false; } continue; } if (inQuote) { tmpBuffer.append(c); continue; } if (!(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z')) { if (count != 0) { encode(lastTag, count, compiledCode); tagcount++; prevTag = lastTag; lastTag = -1; count = 0; } if (c < 128) { // In most cases, c would be a delimiter, such as ':'. compiledCode.append((char) (TAG_QUOTE_ASCII_CHAR << 8 | c)); } else { // Take any contiguous non-ASCII alphabet characters and // put them in a single TAG_QUOTE_CHARS. int j; for (j = i + 1; j < length; j++) { char d = pattern.charAt(j); if (d == '\'' || (d >= 'a' && d <= 'z' || d >= 'A' && d <= 'Z')) { break; } } encode(TAG_QUOTE_CHARS, j - i, compiledCode); for (; i < j; i++) { compiledCode.append(pattern.charAt(i)); } i--; } continue; } int tag; if ((tag = DateFormatSymbols.patternChars.indexOf(c)) == -1) { throw new IllegalArgumentException("Illegal pattern character " + "'" + c + "'"); } if (lastTag == -1 || lastTag == tag) { lastTag = tag; count++; continue; } encode(lastTag, count, compiledCode); tagcount++; prevTag = lastTag; lastTag = tag; count = 1; } if (inQuote) { throw new IllegalArgumentException("Unterminated quote"); } if (count != 0) { encode(lastTag, count, compiledCode); tagcount++; prevTag = lastTag; } forceStandaloneForm = (tagcount == 1 && prevTag == PATTERN_MONTH); // Copy the compiled pattern to a char array int len = compiledCode.length(); char[] r = new char[len]; compiledCode.getChars(0, len, r, 0); return r; } /** * Encodes the given tag and length and puts encoded char(s) into buffer. */ private static void encode(int tag, int length, StringBuilder buffer) { if (tag == PATTERN_ISO_ZONE && length >= 4) { throw new IllegalArgumentException("invalid ISO 8601 format: length=" + length); } if (length < 255) { buffer.append((char) (tag << 8 | length)); } else { buffer.append((char) ((tag << 8) | 0xff)); buffer.append((char) (length >>> 16)); buffer.append((char) (length & 0xffff)); } } /* Initialize the fields we use to disambiguate ambiguous years. Separate * so we can call it from readObject(). */ private void initializeDefaultCentury() { calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.YEAR, -80); parseAmbiguousDatesAsAfter(calendar.getTime()); } /* Define one-century window into which to disambiguate dates using * two-digit years. */ private void parseAmbiguousDatesAsAfter(Date startDate) { defaultCenturyStart = startDate; calendar.setTime(startDate); defaultCenturyStartYear = calendar.get(Calendar.YEAR); } /** * Sets the 100-year period 2-digit years will be interpreted as being in * to begin on the date the user specifies. * * @param startDate During parsing, two digit years will be placed in the range * <code>startDate</code> to <code>startDate + 100 years</code>. * @see #get2DigitYearStart * @throws NullPointerException if {@code startDate} is {@code null}. * @since 1.2 */ public void set2DigitYearStart(Date startDate) { parseAmbiguousDatesAsAfter(new Date(startDate.getTime())); } /** * Returns the beginning date of the 100-year period 2-digit years are interpreted * as being within. * * @return the start of the 100-year period into which two digit years are * parsed * @see #set2DigitYearStart * @since 1.2 */ public Date get2DigitYearStart() { return (Date) defaultCenturyStart.clone(); } /** * Formats the given <code>Date</code> into a date/time string and appends * the result to the given <code>StringBuffer</code>. * * @param date the date-time value to be formatted into a date-time string. * @param toAppendTo where the new date-time text is to be appended. * @param pos keeps track on the position of the field within * the returned string. For example, given a date-time text * {@code "1996.07.10 AD at 15:08:56 PDT"}, if the given {@code fieldPosition} * is {@link DateFormat#YEAR_FIELD}, the begin index and end index of * {@code fieldPosition} will be set to 0 and 4, respectively. * Notice that if the same date-time field appears more than once in a * pattern, the {@code fieldPosition} will be set for the first occurrence * of that date-time field. For instance, formatting a {@code Date} to the * date-time string {@code "1 PM PDT (Pacific Daylight Time)"} using the * pattern {@code "h a z (zzzz)"} and the alignment field * {@link DateFormat#TIMEZONE_FIELD}, the begin index and end index of * {@code fieldPosition} will be set to 5 and 8, respectively, for the * first occurrence of the timezone pattern character {@code 'z'}. * @return the formatted date-time string. * @exception NullPointerException if any of the parameters is {@code null}. */ @Override public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition pos) { pos.beginIndex = pos.endIndex = 0; return format(date, toAppendTo, pos.getFieldDelegate()); } // Called from Format after creating a FieldDelegate private StringBuffer format(Date date, StringBuffer toAppendTo, FieldDelegate delegate) { // Convert input date to time field list calendar.setTime(date); boolean useDateFormatSymbols = useDateFormatSymbols(); for (int i = 0; i < compiledPattern.length;) { int tag = compiledPattern[i] >>> 8; int count = compiledPattern[i++] & 0xff; if (count == 255) { count = compiledPattern[i++] << 16; count |= compiledPattern[i++]; } switch (tag) { case TAG_QUOTE_ASCII_CHAR: toAppendTo.append((char) count); break; case TAG_QUOTE_CHARS: toAppendTo.append(compiledPattern, i, count); i += count; break; default: subFormat(tag, count, delegate, toAppendTo, useDateFormatSymbols); break; } } return toAppendTo; } /** * Formats an Object producing an <code>AttributedCharacterIterator</code>. * You can use the returned <code>AttributedCharacterIterator</code> * to build the resulting String, as well as to determine information * about the resulting String. * <p> * Each attribute key of the AttributedCharacterIterator will be of type * <code>DateFormat.Field</code>, with the corresponding attribute value * being the same as the attribute key. * * @exception NullPointerException if obj is null. * @exception IllegalArgumentException if the Format cannot format the * given object, or if the Format's pattern string is invalid. * @param obj The object to format * @return AttributedCharacterIterator describing the formatted value. * @since 1.4 */ @Override public AttributedCharacterIterator formatToCharacterIterator(Object obj) { StringBuffer sb = new StringBuffer(); CharacterIteratorFieldDelegate delegate = new CharacterIteratorFieldDelegate(); if (obj instanceof Date) { format((Date) obj, sb, delegate); } else if (obj instanceof Number) { format(new Date(((Number) obj).longValue()), sb, delegate); } else if (obj == null) { throw new NullPointerException("formatToCharacterIterator must be passed non-null object"); } else { throw new IllegalArgumentException("Cannot format given Object as a Date"); } return delegate.getIterator(sb.toString()); } // Map index into pattern character string to Calendar field number private static final int[] PATTERN_INDEX_TO_CALENDAR_FIELD = { Calendar.ERA, Calendar.YEAR, Calendar.MONTH, Calendar.DATE, Calendar.HOUR_OF_DAY, Calendar.HOUR_OF_DAY, Calendar.MINUTE, Calendar.SECOND, Calendar.MILLISECOND, Calendar.DAY_OF_WEEK, Calendar.DAY_OF_YEAR, Calendar.DAY_OF_WEEK_IN_MONTH, Calendar.WEEK_OF_YEAR, Calendar.WEEK_OF_MONTH, Calendar.AM_PM, Calendar.HOUR, Calendar.HOUR, Calendar.ZONE_OFFSET, Calendar.ZONE_OFFSET, CalendarBuilder.WEEK_YEAR, // Pseudo Calendar field CalendarBuilder.ISO_DAY_OF_WEEK, // Pseudo Calendar field Calendar.ZONE_OFFSET, Calendar.MONTH }; // Map index into pattern character string to DateFormat field number private static final int[] PATTERN_INDEX_TO_DATE_FORMAT_FIELD = { DateFormat.ERA_FIELD, DateFormat.YEAR_FIELD, DateFormat.MONTH_FIELD, DateFormat.DATE_FIELD, DateFormat.HOUR_OF_DAY1_FIELD, DateFormat.HOUR_OF_DAY0_FIELD, DateFormat.MINUTE_FIELD, DateFormat.SECOND_FIELD, DateFormat.MILLISECOND_FIELD, DateFormat.DAY_OF_WEEK_FIELD, DateFormat.DAY_OF_YEAR_FIELD, DateFormat.DAY_OF_WEEK_IN_MONTH_FIELD, DateFormat.WEEK_OF_YEAR_FIELD, DateFormat.WEEK_OF_MONTH_FIELD, DateFormat.AM_PM_FIELD, DateFormat.HOUR1_FIELD, DateFormat.HOUR0_FIELD, DateFormat.TIMEZONE_FIELD, DateFormat.TIMEZONE_FIELD, DateFormat.YEAR_FIELD, DateFormat.DAY_OF_WEEK_FIELD, DateFormat.TIMEZONE_FIELD, DateFormat.MONTH_FIELD }; // Maps from DecimalFormatSymbols index to Field constant private static final Field[] PATTERN_INDEX_TO_DATE_FORMAT_FIELD_ID = { Field.ERA, Field.YEAR, Field.MONTH, Field.DAY_OF_MONTH, Field.HOUR_OF_DAY1, Field.HOUR_OF_DAY0, Field.MINUTE, Field.SECOND, Field.MILLISECOND, Field.DAY_OF_WEEK, Field.DAY_OF_YEAR, Field.DAY_OF_WEEK_IN_MONTH, Field.WEEK_OF_YEAR, Field.WEEK_OF_MONTH, Field.AM_PM, Field.HOUR1, Field.HOUR0, Field.TIME_ZONE, Field.TIME_ZONE, Field.YEAR, Field.DAY_OF_WEEK, Field.TIME_ZONE, Field.MONTH }; /** * Private member function that does the real date/time formatting. */ private void subFormat(int patternCharIndex, int count, FieldDelegate delegate, StringBuffer buffer, boolean useDateFormatSymbols) { int maxIntCount = Integer.MAX_VALUE; String current = null; int beginOffset = buffer.length(); int field = PATTERN_INDEX_TO_CALENDAR_FIELD[patternCharIndex]; int value; if (field == CalendarBuilder.WEEK_YEAR) { if (calendar.isWeekDateSupported()) { value = calendar.getWeekYear(); } else { // use calendar year 'y' instead patternCharIndex = PATTERN_YEAR; field = PATTERN_INDEX_TO_CALENDAR_FIELD[patternCharIndex]; value = calendar.get(field); } } else if (field == CalendarBuilder.ISO_DAY_OF_WEEK) { value = CalendarBuilder.toISODayOfWeek(calendar.get(Calendar.DAY_OF_WEEK)); } else { value = calendar.get(field); } int style = (count >= 4) ? Calendar.LONG : Calendar.SHORT; if (!useDateFormatSymbols && field < Calendar.ZONE_OFFSET && patternCharIndex != PATTERN_MONTH_STANDALONE) { current = calendar.getDisplayName(field, style, locale); } // Note: zeroPaddingNumber() assumes that maxDigits is either // 2 or maxIntCount. If we make any changes to this, // zeroPaddingNumber() must be fixed. switch (patternCharIndex) { case PATTERN_ERA: // 'G' if (useDateFormatSymbols) { String[] eras = formatData.getEras(); if (value < eras.length) { current = eras[value]; } } if (current == null) { current = ""; } break; case PATTERN_WEEK_YEAR: // 'Y' case PATTERN_YEAR: // 'y' if (calendar instanceof GregorianCalendar) { if (count != 2) { zeroPaddingNumber(value, count, maxIntCount, buffer); } else { zeroPaddingNumber(value, 2, 2, buffer); } // clip 1996 to 96 } else { if (current == null) { zeroPaddingNumber(value, style == Calendar.LONG ? 1 : count, maxIntCount, buffer); } } break; case PATTERN_MONTH: // 'M' (context sensitive) if (useDateFormatSymbols) { String[] months; if (count >= 4) { months = formatData.getMonths(); current = months[value]; } else if (count == 3) { months = formatData.getShortMonths(); current = months[value]; } } else { if (count < 3) { current = null; } else if (forceStandaloneForm) { current = calendar.getDisplayName(field, style | 0x8000, locale); if (current == null) { current = calendar.getDisplayName(field, style, locale); } } } if (current == null) { zeroPaddingNumber(value + 1, count, maxIntCount, buffer); } break; case PATTERN_MONTH_STANDALONE: // 'L' assert current == null; if (locale == null) { String[] months; if (count >= 4) { months = formatData.getMonths(); current = months[value]; } else if (count == 3) { months = formatData.getShortMonths(); current = months[value]; } } else { if (count >= 3) { current = calendar.getDisplayName(field, style | 0x8000, locale); } } if (current == null) { zeroPaddingNumber(value + 1, count, maxIntCount, buffer); } break; case PATTERN_HOUR_OF_DAY1: // 'k' 1-based. eg, 23:59 + 1 hour =>> 24:59 if (current == null) { if (value == 0) { zeroPaddingNumber(calendar.getMaximum(Calendar.HOUR_OF_DAY) + 1, count, maxIntCount, buffer); } else { zeroPaddingNumber(value, count, maxIntCount, buffer); } } break; case PATTERN_DAY_OF_WEEK: // 'E' if (useDateFormatSymbols) { String[] weekdays; if (count >= 4) { weekdays = formatData.getWeekdays(); current = weekdays[value]; } else { // count < 4, use abbreviated form if exists weekdays = formatData.getShortWeekdays(); current = weekdays[value]; } } break; case PATTERN_AM_PM: // 'a' if (useDateFormatSymbols) { String[] ampm = formatData.getAmPmStrings(); current = ampm[value]; } break; case PATTERN_HOUR1: // 'h' 1-based. eg, 11PM + 1 hour =>> 12 AM if (current == null) { if (value == 0) { zeroPaddingNumber(calendar.getLeastMaximum(Calendar.HOUR) + 1, count, maxIntCount, buffer); } else { zeroPaddingNumber(value, count, maxIntCount, buffer); } } break; case PATTERN_ZONE_NAME: // 'z' if (current == null) { if (formatData.locale == null || formatData.isZoneStringsSet) { int zoneIndex = formatData.getZoneIndex(calendar.getTimeZone().getID()); if (zoneIndex == -1) { value = calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET); buffer.append(ZoneInfoFile.toCustomID(value)); } else { int index = (calendar.get(Calendar.DST_OFFSET) == 0) ? 1 : 3; if (count < 4) { // Use the short name index++; } String[][] zoneStrings = formatData.getZoneStringsWrapper(); buffer.append(zoneStrings[zoneIndex][index]); } } else { TimeZone tz = calendar.getTimeZone(); boolean daylight = (calendar.get(Calendar.DST_OFFSET) != 0); int tzstyle = (count < 4 ? TimeZone.SHORT : TimeZone.LONG); buffer.append(tz.getDisplayName(daylight, tzstyle, formatData.locale)); } } break; case PATTERN_ZONE_VALUE: // 'Z' ("-/+hhmm" form) value = (calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET)) / 60000; int width = 4; if (value >= 0) { buffer.append('+'); } else { width++; } int num = (value / 60) * 100 + (value % 60); CalendarUtils.sprintf0d(buffer, num, width); break; case PATTERN_ISO_ZONE: // 'X' value = calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET); if (value == 0) { buffer.append('Z'); break; } value /= 60000; if (value >= 0) { buffer.append('+'); } else { buffer.append('-'); value = -value; } CalendarUtils.sprintf0d(buffer, value / 60, 2); if (count == 1) { break; } if (count == 3) { buffer.append(':'); } CalendarUtils.sprintf0d(buffer, value % 60, 2); break; default: // case PATTERN_DAY_OF_MONTH: // 'd' // case PATTERN_HOUR_OF_DAY0: // 'H' 0-based. eg, 23:59 + 1 hour =>> 00:59 // case PATTERN_MINUTE: // 'm' // case PATTERN_SECOND: // 's' // case PATTERN_MILLISECOND: // 'S' // case PATTERN_DAY_OF_YEAR: // 'D' // case PATTERN_DAY_OF_WEEK_IN_MONTH: // 'F' // case PATTERN_WEEK_OF_YEAR: // 'w' // case PATTERN_WEEK_OF_MONTH: // 'W' // case PATTERN_HOUR0: // 'K' eg, 11PM + 1 hour =>> 0 AM // case PATTERN_ISO_DAY_OF_WEEK: // 'u' pseudo field, Monday = 1, ..., Sunday = 7 if (current == null) { zeroPaddingNumber(value, count, maxIntCount, buffer); } break; } // switch (patternCharIndex) if (current != null) { buffer.append(current); } int fieldID = PATTERN_INDEX_TO_DATE_FORMAT_FIELD[patternCharIndex]; Field f = PATTERN_INDEX_TO_DATE_FORMAT_FIELD_ID[patternCharIndex]; delegate.formatted(fieldID, f, f, beginOffset, buffer.length(), buffer); } /** * Formats a number with the specified minimum and maximum number of digits. */ private void zeroPaddingNumber(int value, int minDigits, int maxDigits, StringBuffer buffer) { // Optimization for 1, 2 and 4 digit numbers. This should // cover most cases of formatting date/time related items. // Note: This optimization code assumes that maxDigits is // either 2 or Integer.MAX_VALUE (maxIntCount in format()). try { if (zeroDigit == 0) { zeroDigit = ((DecimalFormat) numberFormat).getDecimalFormatSymbols().getZeroDigit(); } if (value >= 0) { if (value < 100 && minDigits >= 1 && minDigits <= 2) { if (value < 10) { if (minDigits == 2) { buffer.append(zeroDigit); } buffer.append((char) (zeroDigit + value)); } else { buffer.append((char) (zeroDigit + value / 10)); buffer.append((char) (zeroDigit + value % 10)); } return; } else if (value >= 1000 && value < 10000) { if (minDigits == 4) { buffer.append((char) (zeroDigit + value / 1000)); value %= 1000; buffer.append((char) (zeroDigit + value / 100)); value %= 100; buffer.append((char) (zeroDigit + value / 10)); buffer.append((char) (zeroDigit + value % 10)); return; } if (minDigits == 2 && maxDigits == 2) { zeroPaddingNumber(value % 100, 2, 2, buffer); return; } } } } catch (Exception e) { } numberFormat.setMinimumIntegerDigits(minDigits); numberFormat.setMaximumIntegerDigits(maxDigits); numberFormat.format((long) value, buffer, DontCareFieldPosition.INSTANCE); } /** * Parses text from a string to produce a <code>Date</code>. * <p> * The method attempts to parse text starting at the index given by * <code>pos</code>. * If parsing succeeds, then the index of <code>pos</code> is updated * to the index after the last character used (parsing does not necessarily * use all characters up to the end of the string), and the parsed * date is returned. The updated <code>pos</code> can be used to * indicate the starting point for the next call to this method. * If an error occurs, then the index of <code>pos</code> is not * changed, the error index of <code>pos</code> is set to the index of * the character where the error occurred, and null is returned. * * <p>This parsing operation uses the {@link DateFormat#calendar * calendar} to produce a {@code Date}. All of the {@code * calendar}'s date-time fields are {@linkplain Calendar#clear() * cleared} before parsing, and the {@code calendar}'s default * values of the date-time fields are used for any missing * date-time information. For example, the year value of the * parsed {@code Date} is 1970 with {@link GregorianCalendar} if * no year value is given from the parsing operation. The {@code * TimeZone} value may be overwritten, depending on the given * pattern and the time zone value in {@code text}. Any {@code * TimeZone} value that has previously been set by a call to * {@link #setTimeZone(java.util.TimeZone) setTimeZone} may need * to be restored for further operations. * * @param text A <code>String</code>, part of which should be parsed. * @param pos A <code>ParsePosition</code> object with index and error * index information as described above. * @return A <code>Date</code> parsed from the string. In case of * error, returns null. * @exception NullPointerException if <code>text</code> or <code>pos</code> is null. */ @Override public Date parse(String text, ParsePosition pos) { checkNegativeNumberExpression(); int start = pos.index; int oldStart = start; int textLength = text.length(); boolean[] ambiguousYear = { false }; CalendarBuilder calb = new CalendarBuilder(); for (int i = 0; i < compiledPattern.length;) { int tag = compiledPattern[i] >>> 8; int count = compiledPattern[i++] & 0xff; if (count == 255) { count = compiledPattern[i++] << 16; count |= compiledPattern[i++]; } switch (tag) { case TAG_QUOTE_ASCII_CHAR: if (start >= textLength || text.charAt(start) != (char) count) { pos.index = oldStart; pos.errorIndex = start; return null; } start++; break; case TAG_QUOTE_CHARS: while (count-- > 0) { if (start >= textLength || text.charAt(start) != compiledPattern[i++]) { pos.index = oldStart; pos.errorIndex = start; return null; } start++; } break; default: // Peek the next pattern to determine if we need to // obey the number of pattern letters for // parsing. It's required when parsing contiguous // digit text (e.g., "20010704") with a pattern which // has no delimiters between fields, like "yyyyMMdd". boolean obeyCount = false; // In Arabic, a minus sign for a negative number is put after // the number. Even in another locale, a minus sign can be // put after a number using DateFormat.setNumberFormat(). // If both the minus sign and the field-delimiter are '-', // subParse() needs to determine whether a '-' after a number // in the given text is a delimiter or is a minus sign for the // preceding number. We give subParse() a clue based on the // information in compiledPattern. boolean useFollowingMinusSignAsDelimiter = false; if (i < compiledPattern.length) { int nextTag = compiledPattern[i] >>> 8; int nextCount = compiledPattern[i] & 0xff; obeyCount = shouldObeyCount(nextTag, nextCount); if (hasFollowingMinusSign && (nextTag == TAG_QUOTE_ASCII_CHAR || nextTag == TAG_QUOTE_CHARS)) { if (nextTag != TAG_QUOTE_ASCII_CHAR) { nextCount = compiledPattern[i + 1]; } if (nextCount == minusSign) { useFollowingMinusSignAsDelimiter = true; } } } start = subParse(text, start, tag, count, obeyCount, ambiguousYear, pos, useFollowingMinusSignAsDelimiter, calb); if (start < 0) { pos.index = oldStart; return null; } } } // At this point the fields of Calendar have been set. Calendar // will fill in default values for missing fields when the time // is computed. pos.index = start; Date parsedDate; try { parsedDate = calb.establish(calendar).getTime(); // If the year value is ambiguous, // then the two-digit year == the default start year if (ambiguousYear[0]) { if (parsedDate.before(defaultCenturyStart)) { parsedDate = calb.addYear(100).establish(calendar).getTime(); } } } // An IllegalArgumentException will be thrown by Calendar.getTime() // if any fields are out of range, e.g., MONTH == 17. catch (IllegalArgumentException e) { pos.errorIndex = start; pos.index = oldStart; return null; } return parsedDate; } /* If the next tag/pattern is a <Numeric_Field> then the parser * should consider the count of digits while parsing the contigous digits * for the current tag/pattern */ private boolean shouldObeyCount(int tag, int count) { switch (tag) { case PATTERN_MONTH: case PATTERN_MONTH_STANDALONE: return count <= 2; case PATTERN_YEAR: case PATTERN_DAY_OF_MONTH: case PATTERN_HOUR_OF_DAY1: case PATTERN_HOUR_OF_DAY0: case PATTERN_MINUTE: case PATTERN_SECOND: case PATTERN_MILLISECOND: case PATTERN_DAY_OF_YEAR: case PATTERN_DAY_OF_WEEK_IN_MONTH: case PATTERN_WEEK_OF_YEAR: case PATTERN_WEEK_OF_MONTH: case PATTERN_HOUR1: case PATTERN_HOUR0: case PATTERN_WEEK_YEAR: case PATTERN_ISO_DAY_OF_WEEK: return true; default: return false; } } /** * Private code-size reduction function used by subParse. * @param text the time text being parsed. * @param start where to start parsing. * @param field the date field being parsed. * @param data the string array to parsed. * @return the new start position if matching succeeded; a negative number * indicating matching failure, otherwise. */ private int matchString(String text, int start, int field, String[] data, CalendarBuilder calb) { int i = 0; int count = data.length; if (field == Calendar.DAY_OF_WEEK) { i = 1; } // There may be multiple strings in the data[] array which begin with // the same prefix (e.g., Cerven and Cervenec (June and July) in Czech). // We keep track of the longest match, and return that. Note that this // unfortunately requires us to test all array elements. int bestMatchLength = 0, bestMatch = -1; for (; i < count; ++i) { int length = data[i].length(); // Always compare if we have no match yet; otherwise only compare // against potentially better matches (longer strings). if (length > bestMatchLength && text.regionMatches(true, start, data[i], 0, length)) { bestMatch = i; bestMatchLength = length; } } if (bestMatch >= 0) { calb.set(field, bestMatch); return start + bestMatchLength; } return -start; } /** * Performs the same thing as matchString(String, int, int, * String[]). This method takes a Map<String, Integer> instead of * String[]. */ private int matchString(String text, int start, int field, Map<String, Integer> data, CalendarBuilder calb) { if (data != null) { // TODO: make this default when it's in the spec. if (data instanceof SortedMap) { for (String name : data.keySet()) { if (text.regionMatches(true, start, name, 0, name.length())) { calb.set(field, data.get(name)); return start + name.length(); } } return -start; } String bestMatch = null; for (String name : data.keySet()) { int length = name.length(); if (bestMatch == null || length > bestMatch.length()) { if (text.regionMatches(true, start, name, 0, length)) { bestMatch = name; } } } if (bestMatch != null) { calb.set(field, data.get(bestMatch)); return start + bestMatch.length(); } } return -start; } private int matchZoneString(String text, int start, String[] zoneNames) { for (int i = 1; i <= 4; ++i) { // Checking long and short zones [1 & 2], // and long and short daylight [3 & 4]. String zoneName = zoneNames[i]; if (zoneName.isEmpty()) { // fill in by retrieving single name zoneName = TimeZoneNameUtility.retrieveDisplayName(zoneNames[0], i >= 3, i % 2, locale); zoneNames[i] = zoneName; } if (text.regionMatches(true, start, zoneName, 0, zoneName.length())) { return i; } } return -1; } private boolean matchDSTString(String text, int start, int zoneIndex, int standardIndex, String[][] zoneStrings) { int index = standardIndex + 2; String zoneName = zoneStrings[zoneIndex][index]; if (text.regionMatches(true, start, zoneName, 0, zoneName.length())) { return true; } return false; } /** * find time zone 'text' matched zoneStrings and set to internal * calendar. */ private int subParseZoneString(String text, int start, CalendarBuilder calb) { boolean useSameName = false; // true if standard and daylight time use the same abbreviation. TimeZone currentTimeZone = getTimeZone(); // At this point, check for named time zones by looking through // the locale data from the TimeZoneNames strings. // Want to be able to parse both short and long forms. int zoneIndex = formatData.getZoneIndex(currentTimeZone.getID()); TimeZone tz = null; String[][] zoneStrings = formatData.getZoneStringsWrapper(); String[] zoneNames = null; int nameIndex = 0; if (zoneIndex != -1) { zoneNames = zoneStrings[zoneIndex]; if ((nameIndex = matchZoneString(text, start, zoneNames)) > 0) { if (nameIndex <= 2) { // Check if the standard name (abbr) and the daylight name are the same. useSameName = zoneNames[nameIndex].equalsIgnoreCase(zoneNames[nameIndex + 2]); } tz = TimeZone.getTimeZone(zoneNames[0]); } } if (tz == null) { zoneIndex = formatData.getZoneIndex(TimeZone.getDefault().getID()); if (zoneIndex != -1) { zoneNames = zoneStrings[zoneIndex]; if ((nameIndex = matchZoneString(text, start, zoneNames)) > 0) { if (nameIndex <= 2) { useSameName = zoneNames[nameIndex].equalsIgnoreCase(zoneNames[nameIndex + 2]); } tz = TimeZone.getTimeZone(zoneNames[0]); } } } if (tz == null) { int len = zoneStrings.length; for (int i = 0; i < len; i++) { zoneNames = zoneStrings[i]; if ((nameIndex = matchZoneString(text, start, zoneNames)) > 0) { if (nameIndex <= 2) { useSameName = zoneNames[nameIndex].equalsIgnoreCase(zoneNames[nameIndex + 2]); } tz = TimeZone.getTimeZone(zoneNames[0]); break; } } } if (tz != null) { // Matched any ? if (!tz.equals(currentTimeZone)) { setTimeZone(tz); } // If the time zone matched uses the same name // (abbreviation) for both standard and daylight time, // let the time zone in the Calendar decide which one. // // Also if tz.getDSTSaving() returns 0 for DST, use tz to // determine the local time. (6645292) int dstAmount = (nameIndex >= 3) ? tz.getDSTSavings() : 0; if (!(useSameName || (nameIndex >= 3 && dstAmount == 0))) { calb.clear(Calendar.ZONE_OFFSET).set(Calendar.DST_OFFSET, dstAmount); } return (start + zoneNames[nameIndex].length()); } return -start; } /** * Parses numeric forms of time zone offset, such as "hh:mm", and * sets calb to the parsed value. * * @param text the text to be parsed * @param start the character position to start parsing * @param sign 1: positive; -1: negative * @param count 0: 'Z' or "GMT+hh:mm" parsing; 1 - 3: the number of 'X's * @param colon true - colon required between hh and mm; false - no colon required * @param calb a CalendarBuilder in which the parsed value is stored * @return updated parsed position, or its negative value to indicate a parsing error */ private int subParseNumericZone(String text, int start, int sign, int count, boolean colon, CalendarBuilder calb) { int index = start; parse: try { char c = text.charAt(index++); // Parse hh int hours; if (!isDigit(c)) { break parse; } hours = c - '0'; c = text.charAt(index++); if (isDigit(c)) { hours = hours * 10 + (c - '0'); } else { // If no colon in RFC 822 or 'X' (ISO), two digits are // required. if (count > 0 || !colon) { break parse; } --index; } if (hours > 23) { break parse; } int minutes = 0; if (count != 1) { // Proceed with parsing mm c = text.charAt(index++); if (colon) { if (c != ':') { break parse; } c = text.charAt(index++); } if (!isDigit(c)) { break parse; } minutes = c - '0'; c = text.charAt(index++); if (!isDigit(c)) { break parse; } minutes = minutes * 10 + (c - '0'); if (minutes > 59) { break parse; } } minutes += hours * 60; calb.set(Calendar.ZONE_OFFSET, minutes * MILLIS_PER_MINUTE * sign).set(Calendar.DST_OFFSET, 0); return index; } catch (IndexOutOfBoundsException e) { } return 1 - index; // -(index - 1) } private boolean isDigit(char c) { return c >= '0' && c <= '9'; } /** * Private member function that converts the parsed date strings into * timeFields. Returns -start (for ParsePosition) if failed. * @param text the time text to be parsed. * @param start where to start parsing. * @param patternCharIndex the index of the pattern character. * @param count the count of a pattern character. * @param obeyCount if true, then the next field directly abuts this one, * and we should use the count to know when to stop parsing. * @param ambiguousYear return parameter; upon return, if ambiguousYear[0] * is true, then a two-digit year was parsed and may need to be readjusted. * @param origPos origPos.errorIndex is used to return an error index * at which a parse error occurred, if matching failure occurs. * @return the new start position if matching succeeded; -1 indicating * matching failure, otherwise. In case matching failure occurred, * an error index is set to origPos.errorIndex. */ private int subParse(String text, int start, int patternCharIndex, int count, boolean obeyCount, boolean[] ambiguousYear, ParsePosition origPos, boolean useFollowingMinusSignAsDelimiter, CalendarBuilder calb) { Number number; int value = 0; ParsePosition pos = new ParsePosition(0); pos.index = start; if (patternCharIndex == PATTERN_WEEK_YEAR && !calendar.isWeekDateSupported()) { // use calendar year 'y' instead patternCharIndex = PATTERN_YEAR; } int field = PATTERN_INDEX_TO_CALENDAR_FIELD[patternCharIndex]; // If there are any spaces here, skip over them. If we hit the end // of the string, then fail. for (;;) { if (pos.index >= text.length()) { origPos.errorIndex = start; return -1; } char c = text.charAt(pos.index); if (c != ' ' && c != '\t') { break; } ++pos.index; } // Remember the actual start index int actualStart = pos.index; parsing: { // We handle a few special cases here where we need to parse // a number value. We handle further, more generic cases below. We need // to handle some of them here because some fields require extra processing on // the parsed value. if (patternCharIndex == PATTERN_HOUR_OF_DAY1 || patternCharIndex == PATTERN_HOUR1 || (patternCharIndex == PATTERN_MONTH && count <= 2) || (patternCharIndex == PATTERN_MONTH_STANDALONE && count <= 2) || patternCharIndex == PATTERN_YEAR || patternCharIndex == PATTERN_WEEK_YEAR) { // It would be good to unify this with the obeyCount logic below, // but that's going to be difficult. if (obeyCount) { if ((start + count) > text.length()) { break parsing; } number = numberFormat.parse(text.substring(0, start + count), pos); } else { number = numberFormat.parse(text, pos); } if (number == null) { if (patternCharIndex != PATTERN_YEAR || calendar instanceof GregorianCalendar) { break parsing; } } else { value = number.intValue(); if (useFollowingMinusSignAsDelimiter && (value < 0) && (((pos.index < text.length()) && (text.charAt(pos.index) != minusSign)) || ((pos.index == text.length()) && (text.charAt(pos.index - 1) == minusSign)))) { value = -value; pos.index--; } } } boolean useDateFormatSymbols = useDateFormatSymbols(); int index; switch (patternCharIndex) { case PATTERN_ERA: // 'G' if (useDateFormatSymbols) { if ((index = matchString(text, start, Calendar.ERA, formatData.getEras(), calb)) > 0) { return index; } } else { Map<String, Integer> map = getDisplayNamesMap(field, locale); if ((index = matchString(text, start, field, map, calb)) > 0) { return index; } } break parsing; case PATTERN_WEEK_YEAR: // 'Y' case PATTERN_YEAR: // 'y' if (!(calendar instanceof GregorianCalendar)) { // calendar might have text representations for year values, // such as "\u5143" in JapaneseImperialCalendar. int style = (count >= 4) ? Calendar.LONG : Calendar.SHORT; Map<String, Integer> map = calendar.getDisplayNames(field, style, locale); if (map != null) { if ((index = matchString(text, start, field, map, calb)) > 0) { return index; } } calb.set(field, value); return pos.index; } // If there are 3 or more YEAR pattern characters, this indicates // that the year value is to be treated literally, without any // two-digit year adjustments (e.g., from "01" to 2001). Otherwise // we made adjustments to place the 2-digit year in the proper // century, for parsed strings from "00" to "99". Any other string // is treated literally: "2250", "-1", "1", "002". if (count <= 2 && (pos.index - actualStart) == 2 && Character.isDigit(text.charAt(actualStart)) && Character.isDigit(text.charAt(actualStart + 1))) { // Assume for example that the defaultCenturyStart is 6/18/1903. // This means that two-digit years will be forced into the range // 6/18/1903 to 6/17/2003. As a result, years 00, 01, and 02 // correspond to 2000, 2001, and 2002. Years 04, 05, etc. correspond // to 1904, 1905, etc. If the year is 03, then it is 2003 if the // other fields specify a date before 6/18, or 1903 if they specify a // date afterwards. As a result, 03 is an ambiguous year. All other // two-digit years are unambiguous. int ambiguousTwoDigitYear = defaultCenturyStartYear % 100; ambiguousYear[0] = value == ambiguousTwoDigitYear; value += (defaultCenturyStartYear / 100) * 100 + (value < ambiguousTwoDigitYear ? 100 : 0); } calb.set(field, value); return pos.index; case PATTERN_MONTH: // 'M' if (count <= 2) // i.e., M or MM. { // Don't want to parse the month if it is a string // while pattern uses numeric style: M or MM. // [We computed 'value' above.] calb.set(Calendar.MONTH, value - 1); return pos.index; } if (useDateFormatSymbols) { // count >= 3 // i.e., MMM or MMMM // Want to be able to parse both short and long forms. // Try count == 4 first: int newStart; if ((newStart = matchString(text, start, Calendar.MONTH, formatData.getMonths(), calb)) > 0) { return newStart; } // count == 4 failed, now try count == 3 if ((index = matchString(text, start, Calendar.MONTH, formatData.getShortMonths(), calb)) > 0) { return index; } } else { Map<String, Integer> map = getDisplayContextNamesMap(field, locale); if ((index = matchString(text, start, field, map, calb)) > 0) { return index; } } break parsing; case PATTERN_MONTH_STANDALONE: // 'L' if (count <= 2) { // Don't want to parse the month if it is a string // while pattern uses numeric style: L or LL //[we computed 'value' above.] calb.set(Calendar.MONTH, value - 1); return pos.index; } Map<String, Integer> maps = getDisplayNamesMap(field, locale); if ((index = matchString(text, start, field, maps, calb)) > 0) { return index; } break parsing; case PATTERN_HOUR_OF_DAY1: // 'k' 1-based. eg, 23:59 + 1 hour =>> 24:59 if (!isLenient()) { // Validate the hour value in non-lenient if (value < 1 || value > 24) { break parsing; } } // [We computed 'value' above.] if (value == calendar.getMaximum(Calendar.HOUR_OF_DAY) + 1) { value = 0; } calb.set(Calendar.HOUR_OF_DAY, value); return pos.index; case PATTERN_DAY_OF_WEEK: // 'E' { if (useDateFormatSymbols) { // Want to be able to parse both short and long forms. // Try count == 4 (DDDD) first: int newStart; if ((newStart = matchString(text, start, Calendar.DAY_OF_WEEK, formatData.getWeekdays(), calb)) > 0) { return newStart; } // DDDD failed, now try DDD if ((index = matchString(text, start, Calendar.DAY_OF_WEEK, formatData.getShortWeekdays(), calb)) > 0) { return index; } } else { int[] styles = { Calendar.LONG, Calendar.SHORT }; for (int style : styles) { Map<String, Integer> map = calendar.getDisplayNames(field, style, locale); if ((index = matchString(text, start, field, map, calb)) > 0) { return index; } } } } break parsing; case PATTERN_AM_PM: // 'a' if (useDateFormatSymbols) { if ((index = matchString(text, start, Calendar.AM_PM, formatData.getAmPmStrings(), calb)) > 0) { return index; } } else { Map<String, Integer> map = getDisplayNamesMap(field, locale); if ((index = matchString(text, start, field, map, calb)) > 0) { return index; } } break parsing; case PATTERN_HOUR1: // 'h' 1-based. eg, 11PM + 1 hour =>> 12 AM if (!isLenient()) { // Validate the hour value in non-lenient if (value < 1 || value > 12) { break parsing; } } // [We computed 'value' above.] if (value == calendar.getLeastMaximum(Calendar.HOUR) + 1) { value = 0; } calb.set(Calendar.HOUR, value); return pos.index; case PATTERN_ZONE_NAME: // 'z' case PATTERN_ZONE_VALUE: // 'Z' { int sign = 0; try { char c = text.charAt(pos.index); if (c == '+') { sign = 1; } else if (c == '-') { sign = -1; } if (sign == 0) { // Try parsing a custom time zone "GMT+hh:mm" or "GMT". if ((c == 'G' || c == 'g') && (text.length() - start) >= GMT.length() && text.regionMatches(true, start, GMT, 0, GMT.length())) { pos.index = start + GMT.length(); if ((text.length() - pos.index) > 0) { c = text.charAt(pos.index); if (c == '+') { sign = 1; } else if (c == '-') { sign = -1; } } if (sign == 0) { /* "GMT" without offset */ calb.set(Calendar.ZONE_OFFSET, 0).set(Calendar.DST_OFFSET, 0); return pos.index; } // Parse the rest as "hh:mm" int i = subParseNumericZone(text, ++pos.index, sign, 0, true, calb); if (i > 0) { return i; } pos.index = -i; } else { // Try parsing the text as a time zone // name or abbreviation. int i = subParseZoneString(text, pos.index, calb); if (i > 0) { return i; } pos.index = -i; } } else { // Parse the rest as "hhmm" (RFC 822) int i = subParseNumericZone(text, ++pos.index, sign, 0, false, calb); if (i > 0) { return i; } pos.index = -i; } } catch (IndexOutOfBoundsException e) { } } break parsing; case PATTERN_ISO_ZONE: // 'X' { if ((text.length() - pos.index) <= 0) { break parsing; } int sign; char c = text.charAt(pos.index); if (c == 'Z') { calb.set(Calendar.ZONE_OFFSET, 0).set(Calendar.DST_OFFSET, 0); return ++pos.index; } // parse text as "+/-hh[[:]mm]" based on count if (c == '+') { sign = 1; } else if (c == '-') { sign = -1; } else { ++pos.index; break parsing; } int i = subParseNumericZone(text, ++pos.index, sign, count, count == 3, calb); if (i > 0) { return i; } pos.index = -i; } break parsing; default: // case PATTERN_DAY_OF_MONTH: // 'd' // case PATTERN_HOUR_OF_DAY0: // 'H' 0-based. eg, 23:59 + 1 hour =>> 00:59 // case PATTERN_MINUTE: // 'm' // case PATTERN_SECOND: // 's' // case PATTERN_MILLISECOND: // 'S' // case PATTERN_DAY_OF_YEAR: // 'D' // case PATTERN_DAY_OF_WEEK_IN_MONTH: // 'F' // case PATTERN_WEEK_OF_YEAR: // 'w' // case PATTERN_WEEK_OF_MONTH: // 'W' // case PATTERN_HOUR0: // 'K' 0-based. eg, 11PM + 1 hour =>> 0 AM // case PATTERN_ISO_DAY_OF_WEEK: // 'u' (pseudo field); // Handle "generic" fields if (obeyCount) { if ((start + count) > text.length()) { break parsing; } number = numberFormat.parse(text.substring(0, start + count), pos); } else { number = numberFormat.parse(text, pos); } if (number != null) { value = number.intValue(); if (useFollowingMinusSignAsDelimiter && (value < 0) && (((pos.index < text.length()) && (text.charAt(pos.index) != minusSign)) || ((pos.index == text.length()) && (text.charAt(pos.index - 1) == minusSign)))) { value = -value; pos.index--; } calb.set(field, value); return pos.index; } break parsing; } } // Parsing failed. origPos.errorIndex = pos.index; return -1; } /** * Returns true if the DateFormatSymbols has been set explicitly or locale * is null. */ private boolean useDateFormatSymbols() { return useDateFormatSymbols || locale == null; } /** * Translates a pattern, mapping each character in the from string to the * corresponding character in the to string. * * @exception IllegalArgumentException if the given pattern is invalid */ private String translatePattern(String pattern, String from, String to) { StringBuilder result = new StringBuilder(); boolean inQuote = false; for (int i = 0; i < pattern.length(); ++i) { char c = pattern.charAt(i); if (inQuote) { if (c == '\'') { inQuote = false; } } else { if (c == '\'') { inQuote = true; } else if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) { int ci = from.indexOf(c); if (ci >= 0) { // patternChars is longer than localPatternChars due // to serialization compatibility. The pattern letters // unsupported by localPatternChars pass through. if (ci < to.length()) { c = to.charAt(ci); } } else { throw new IllegalArgumentException("Illegal pattern " + " character '" + c + "'"); } } } result.append(c); } if (inQuote) { throw new IllegalArgumentException("Unfinished quote in pattern"); } return result.toString(); } /** * Returns a pattern string describing this date format. * * @return a pattern string describing this date format. */ public String toPattern() { return pattern; } /** * Returns a localized pattern string describing this date format. * * @return a localized pattern string describing this date format. */ public String toLocalizedPattern() { return translatePattern(pattern, DateFormatSymbols.patternChars, formatData.getLocalPatternChars()); } /** * Applies the given pattern string to this date format. * * @param pattern the new date and time pattern for this date format * @exception NullPointerException if the given pattern is null * @exception IllegalArgumentException if the given pattern is invalid */ public void applyPattern(String pattern) { applyPatternImpl(pattern); } private void applyPatternImpl(String pattern) { compiledPattern = compile(pattern); this.pattern = pattern; } /** * Applies the given localized pattern string to this date format. * * @param pattern a String to be mapped to the new date and time format * pattern for this format * @exception NullPointerException if the given pattern is null * @exception IllegalArgumentException if the given pattern is invalid */ public void applyLocalizedPattern(String pattern) { String p = translatePattern(pattern, formatData.getLocalPatternChars(), DateFormatSymbols.patternChars); compiledPattern = compile(p); this.pattern = p; } /** * Gets a copy of the date and time format symbols of this date format. * * @return the date and time format symbols of this date format * @see #setDateFormatSymbols */ public DateFormatSymbols getDateFormatSymbols() { return (DateFormatSymbols) formatData.clone(); } /** * Sets the date and time format symbols of this date format. * * @param newFormatSymbols the new date and time format symbols * @exception NullPointerException if the given newFormatSymbols is null * @see #getDateFormatSymbols */ public void setDateFormatSymbols(DateFormatSymbols newFormatSymbols) { this.formatData = (DateFormatSymbols) newFormatSymbols.clone(); useDateFormatSymbols = true; } /** * Creates a copy of this <code>SimpleDateFormat</code>. This also * clones the format's date format symbols. * * @return a clone of this <code>SimpleDateFormat</code> */ @Override public Object clone() { SimpleDateFormat other = (SimpleDateFormat) super.clone(); other.formatData = (DateFormatSymbols) formatData.clone(); return other; } /** * Returns the hash code value for this <code>SimpleDateFormat</code> object. * * @return the hash code value for this <code>SimpleDateFormat</code> object. */ @Override public int hashCode() { return pattern.hashCode(); // just enough fields for a reasonable distribution } /** * Compares the given object with this <code>SimpleDateFormat</code> for * equality. * * @return true if the given object is equal to this * <code>SimpleDateFormat</code> */ @Override public boolean equals(Object obj) { if (!super.equals(obj)) { return false; // super does class check } SimpleDateFormat that = (SimpleDateFormat) obj; return (pattern.equals(that.pattern) && formatData.equals(that.formatData)); } private static final int[] REST_OF_STYLES = { Calendar.SHORT_STANDALONE, Calendar.LONG_FORMAT, Calendar.LONG_STANDALONE, }; private Map<String, Integer> getDisplayNamesMap(int field, Locale locale) { Map<String, Integer> map = calendar.getDisplayNames(field, Calendar.SHORT_FORMAT, locale); // Get all SHORT and LONG styles (avoid NARROW styles). for (int style : REST_OF_STYLES) { Map<String, Integer> m = calendar.getDisplayNames(field, style, locale); if (m != null) { map.putAll(m); } } return map; } /** * Obtains display names map, taking the context into account. Currently only * the month name pattern 'M' is context dependent. */ private Map<String, Integer> getDisplayContextNamesMap(int field, Locale locale) { Map<String, Integer> map = calendar.getDisplayNames(field, forceStandaloneForm ? Calendar.SHORT_STANDALONE : Calendar.SHORT_FORMAT, locale); // Get the LONG style Map<String, Integer> m = calendar.getDisplayNames(field, forceStandaloneForm ? Calendar.LONG_STANDALONE : Calendar.LONG_FORMAT, locale); if (m != null) { map.putAll(m); } return map; } /** * After reading an object from the input stream, the format * pattern in the object is verified. * * @exception InvalidObjectException if the pattern is invalid */ private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); try { compiledPattern = compile(pattern); } catch (Exception e) { throw new InvalidObjectException("invalid pattern"); } if (serialVersionOnStream < 1) { // didn't have defaultCenturyStart field initializeDefaultCentury(); } else { // fill in dependent transient field parseAmbiguousDatesAsAfter(defaultCenturyStart); } serialVersionOnStream = currentSerialVersion; // If the deserialized object has a SimpleTimeZone, try // to replace it with a ZoneInfo equivalent in order to // be compatible with the SimpleTimeZone-based // implementation as much as possible. TimeZone tz = getTimeZone(); if (tz instanceof SimpleTimeZone) { String id = tz.getID(); TimeZone zi = TimeZone.getTimeZone(id); if (zi != null && zi.hasSameRules(tz) && zi.getID().equals(id)) { setTimeZone(zi); } } } /** * Analyze the negative subpattern of DecimalFormat and set/update values * as necessary. */ private void checkNegativeNumberExpression() { if ((numberFormat instanceof DecimalFormat) && !numberFormat.equals(originalNumberFormat)) { String numberPattern = ((DecimalFormat) numberFormat).toPattern(); if (!numberPattern.equals(originalNumberPattern)) { hasFollowingMinusSign = false; int separatorIndex = numberPattern.indexOf(';'); // If the negative subpattern is not absent, we have to analayze // it in order to check if it has a following minus sign. if (separatorIndex > -1) { int minusIndex = numberPattern.indexOf('-', separatorIndex); if ((minusIndex > numberPattern.lastIndexOf('0')) && (minusIndex > numberPattern.lastIndexOf('#'))) { hasFollowingMinusSign = true; minusSign = ((DecimalFormat) numberFormat).getDecimalFormatSymbols().getMinusSign(); } } originalNumberPattern = numberPattern; } originalNumberFormat = numberFormat; } } }