JDK8/Java8源码在线阅读
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/*
* (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;
/**
* <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}.
*
* <h3>Date and Time Patterns</h3>
* <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 border=0 cellspacing=3 cellpadding=0 summary="Chart shows pattern letters, date/time component, presentation, and examples.">
* <tr style="background-color: rgb(204, 204, 255);">
* <th align=left>Letter
* <th align=left>Date or Time Component
* <th align=left>Presentation
* <th align=left>Examples
* <tr>
* <td><code>G</code>
* <td>Era designator
* <td><a href="#text">Text</a>
* <td><code>AD</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>y</code>
* <td>Year
* <td><a href="#year">Year</a>
* <td><code>1996</code>; <code>96</code>
* <tr>
* <td><code>Y</code>
* <td>Week year
* <td><a href="#year">Year</a>
* <td><code>2009</code>; <code>09</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><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>
* <td><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 style="background-color: rgb(238, 238, 255);">
* <td><code>w</code>
* <td>Week in year
* <td><a href="#number">Number</a>
* <td><code>27</code>
* <tr>
* <td><code>W</code>
* <td>Week in month
* <td><a href="#number">Number</a>
* <td><code>2</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>D</code>
* <td>Day in year
* <td><a href="#number">Number</a>
* <td><code>189</code>
* <tr>
* <td><code>d</code>
* <td>Day in month
* <td><a href="#number">Number</a>
* <td><code>10</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>F</code>
* <td>Day of week in month
* <td><a href="#number">Number</a>
* <td><code>2</code>
* <tr>
* <td><code>E</code>
* <td>Day name in week
* <td><a href="#text">Text</a>
* <td><code>Tuesday</code>; <code>Tue</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>u</code>
* <td>Day number of week (1 = Monday, ..., 7 = Sunday)
* <td><a href="#number">Number</a>
* <td><code>1</code>
* <tr>
* <td><code>a</code>
* <td>Am/pm marker
* <td><a href="#text">Text</a>
* <td><code>PM</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>H</code>
* <td>Hour in day (0-23)
* <td><a href="#number">Number</a>
* <td><code>0</code>
* <tr>
* <td><code>k</code>
* <td>Hour in day (1-24)
* <td><a href="#number">Number</a>
* <td><code>24</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>K</code>
* <td>Hour in am/pm (0-11)
* <td><a href="#number">Number</a>
* <td><code>0</code>
* <tr>
* <td><code>h</code>
* <td>Hour in am/pm (1-12)
* <td><a href="#number">Number</a>
* <td><code>12</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>m</code>
* <td>Minute in hour
* <td><a href="#number">Number</a>
* <td><code>30</code>
* <tr>
* <td><code>s</code>
* <td>Second in minute
* <td><a href="#number">Number</a>
* <td><code>55</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>S</code>
* <td>Millisecond
* <td><a href="#number">Number</a>
* <td><code>978</code>
* <tr>
* <td><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 style="background-color: rgb(238, 238, 255);">
* <td><code>Z</code>
* <td>Time zone
* <td><a href="#rfc822timezone">RFC 822 time zone</a>
* <td><code>-0800</code>
* <tr>
* <td><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>
* </table>
* </blockquote>
* Pattern letters are usually repeated, as their number determines the
* exact presentation:
* <ul>
* <li><strong><a name="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 name="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 name="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 name="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. 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 name="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 name="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 name="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 name="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.
*
* <h4>Examples</h4>
*
* 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 border=0 cellspacing=3 cellpadding=0 summary="Examples of date and time patterns interpreted in the U.S. locale">
* <tr style="background-color: rgb(204, 204, 255);">
* <th align=left>Date and Time Pattern
* <th align=left>Result
* <tr>
* <td><code>"yyyy.MM.dd G 'at' HH:mm:ss z"</code>
* <td><code>2001.07.04 AD at 12:08:56 PDT</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>"EEE, MMM d, ''yy"</code>
* <td><code>Wed, Jul 4, '01</code>
* <tr>
* <td><code>"h:mm a"</code>
* <td><code>12:08 PM</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>"hh 'o''clock' a, zzzz"</code>
* <td><code>12 o'clock PM, Pacific Daylight Time</code>
* <tr>
* <td><code>"K:mm a, z"</code>
* <td><code>0:08 PM, PDT</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>"yyyyy.MMMMM.dd GGG hh:mm aaa"</code>
* <td><code>02001.July.04 AD 12:08 PM</code>
* <tr>
* <td><code>"EEE, d MMM yyyy HH:mm:ss Z"</code>
* <td><code>Wed, 4 Jul 2001 12:08:56 -0700</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>"yyMMddHHmmssZ"</code>
* <td><code>010704120856-0700</code>
* <tr>
* <td><code>"yyyy-MM-dd'T'HH:mm:ss.SSSZ"</code>
* <td><code>2001-07-04T12:08:56.235-0700</code>
* <tr style="background-color: rgb(238, 238, 255);">
* <td><code>"yyyy-MM-dd'T'HH:mm:ss.SSSXXX"</code>
* <td><code>2001-07-04T12:08:56.235-07:00</code>
* <tr>
* <td><code>"YYYY-'W'ww-u"</code>
* <td><code>2001-W27-3</code>
* </table>
* </blockquote>
*
* <h4><a name="synchronization">Synchronization</a></h4>
*
* <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="https://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
*/
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 JDK1.1.4
*/
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
*/
transient private NumberFormat originalNumberFormat;
transient private String originalNumberPattern;
/**
* The minus sign to be used with format and parse.
*/
transient private char minusSign = '-';
/**
* True when a negative sign follows a number.
* (True as default in Arabic.)
*/
transient private boolean hasFollowingMinusSign = false;
/**
* True if standalone form needs to be used.
*/
transient private boolean forceStandaloneForm = false;
/**
* The compiled pattern.
*/
transient private char[] compiledPattern;
/**
* Tags for the compiled pattern.
*/
private final static int TAG_QUOTE_ASCII_CHAR = 100;
private final static int TAG_QUOTE_CHARS = 101;
/**
* Locale dependent digit zero.
* @see #zeroPaddingNumber
* @see java.text.DecimalFormatSymbols#getZeroDigit
*/
transient private 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 JDK1.1.4
*/
private Date defaultCenturyStart;
transient private 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(TimeZone.getDefault(), 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;
}
}
compiledCode.append((char)(TAG_QUOTE_CHARS << 8 | (j - i)));
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
* @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 the formatting position. On input: an alignment field,
* if desired. On output: the offsets of the alignment field.
* @return the formatted date-time string.
* @exception NullPointerException if the given {@code date} 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 seinsive)
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;
if (!(nextTag == TAG_QUOTE_ASCII_CHAR ||
nextTag == TAG_QUOTE_CHARS)) {
obeyCount = true;
}
if (hasFollowingMinusSign &&
(nextTag == TAG_QUOTE_ASCII_CHAR ||
nextTag == TAG_QUOTE_CHARS)) {
int c;
if (nextTag == TAG_QUOTE_ASCII_CHAR) {
c = compiledPattern[i] & 0xff;
} else {
c = compiledPattern[i+1];
}
if (c == 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;
}
/**
* 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 (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 0;
}
/**
* 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_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 = getDisplayNamesMap(field, locale);
if ((index = matchString(text, start, field, map, 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();
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