/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.i18n.client;
import com.google.gwt.i18n.client.constants.DateTimeConstants;
import com.google.gwt.i18n.client.impl.DateRecord;
import java.util.ArrayList;
import java.util.Date;
/**
* Formats and parses dates and times using locale-sensitive patterns.
*
* <h3>Patterns</h3>
*
* <table>
* <tr>
* <th>Symbol</th>
* <th>Meaning</th>
* <th>Presentation</th>
* <th>Example</th>
* </tr>
*
* <tr>
* <td><code>G</code></td>
* <td>era designator</td>
* <td>Text</td>
* <td><code>AD</code></td>
* </tr>
*
* <tr>
* <td><code>y</code></td>
* <td>year</td>
* <td>Number</td>
* <td><code>1996</code></td>
* </tr>
*
* <tr>
* <td><code>L</code></td>
* <td>standalone month in year</td>
* <td>Text or Number</td>
* <td><code>July (or) 07</code></td>
* </tr>
*
* <tr>
* <td><code>M</code></td>
* <td>month in year</td>
* <td>Text or Number</td>
* <td><code>July (or) 07</code></td>
* </tr>
*
* <tr>
* <td><code>d</code></td>
* <td>day in month</td>
* <td>Number</td>
* <td><code>10</code></td>
* </tr>
*
* <tr>
* <td><code>h</code></td>
* <td>hour in am/pm (1-12)</td>
* <td>Number</td>
* <td><code>12</code></td>
* </tr>
*
* <tr>
* <td><code>H</code></td>
* <td>hour in day (0-23)</td>
* <td>Number</td>
* <td><code>0</code></td>
* </tr>
*
* <tr>
* <td><code>m</code></td>
* <td>minute in hour</td>
* <td>Number</td>
* <td><code>30</code></td>
* </tr>
*
* <tr>
* <td><code>s</code></td>
* <td>second in minute</td>
* <td>Number</td>
* <td><code>55</code></td>
* </tr>
*
* <tr>
* <td><code>S</code></td>
* <td>fractional second</td>
* <td>Number</td>
* <td><code>978</code></td>
* </tr>
*
* <tr>
* <td><code>E</code></td>
* <td>day of week</td>
* <td>Text</td>
* <td><code>Tuesday</code></td>
* </tr>
*
* <tr>
* <td><code>c</code></td>
* <td>standalone day of week</td>
* <td>Text</td>
* <td><code>Tuesday</code></td>
* </tr>
*
* <tr>
* <td><code>a</code></td>
* <td>am/pm marker</td>
* <td>Text</td>
* <td><code>PM</code></td>
* </tr>
*
* <tr>
* <td><code>k</code></td>
* <td>hour in day (1-24)</td>
* <td>Number</td>
* <td><code>24</code></td>
* </tr>
*
* <tr>
* <td><code>K</code></td>
* <td>hour in am/pm (0-11)</td>
* <td>Number</td>
* <td><code>0</code></td>
* </tr>
*
* <tr>
* <td><code>z</code></td>
* <td>time zone</td>
* <td>Text</td>
* <td><code>Pacific Standard Time(see comment)</code></td>
* </tr>
*
* <tr>
* <td><code>Z</code></td>
* <td>time zone (RFC 822)</td>
* <td>Text</td>
* <td><code>-0800(See comment)</code></td>
* </tr>
*
* <tr>
* <td><code>v</code></td>
* <td>time zone id</td>
* <td>Text</td>
* <td><code>America/Los_Angeles(See comment)</code></td>
* </tr>
*
* <tr>
* <td><code>'</code></td>
* <td>escape for text</td>
* <td>Delimiter</td>
* <td><code>'Date='</code></td>
* </tr>
*
* <tr>
* <td><code>''</code></td>
* <td>single quote</td>
* <td>Literal</td>
* <td><code>'o''clock'</code></td>
* </tr>
* </table>
*
* <p>
* The number of pattern letters influences the format, as follows:
* </p>
*
* <dl>
* <dt>Text</dt>
* <dd>if 4 or more, then use the full form; if less than 4, use short or
* abbreviated form if it exists (e.g., <code>"EEEE"</code> produces
* <code>"Monday"</code>, <code>"EEE"</code> produces <code>"Mon"</code>)</dd>
*
* <dt>Number</dt>
* <dd>the minimum number of digits. Shorter numbers are zero-padded to this
* amount (e.g. if <code>"m"</code> produces <code>"6"</code>, <code>"mm"</code>
* produces <code>"06"</code>). Year is handled specially; that is, if the count
* of 'y' is 2, the Year will be truncated to 2 digits. (e.g., if
* <code>"yyyy"</code> produces <code>"1997"</code>, <code>"yy"</code> produces
* <code>"97"</code>.) Unlike other fields, fractional seconds are padded on the
* right with zero.</dd>
*
* <dt>Text or Number</dt>
* <dd>3 or more, use text, otherwise use number. (e.g. <code>"M"</code>
* produces <code>"1"</code>, <code>"MM"</code> produces <code>"01"</code>,
* <code>"MMM"</code> produces <code>"Jan"</code>, and <code>"MMMM"</code>
* produces <code>"January"</code>. Some pattern letters also treat a count
* of 5 specially, meaning a single-letter abbreviation: <code>L</code>,
* <code>M</code>, <code>E</code>, and <code>c</code>.</dd>
* </dl>
*
* <p>
* Any characters in the pattern that are not in the ranges of ['<code>a</code>
* '..'<code>z</code>'] and ['<code>A</code>'..'<code>Z</code>'] will be treated
* as quoted text. For instance, characters like '<code>:</code>', '
* <code>.</code>', '<code> </code>' (space), '<code>#</code>' and '
* <code>@</code>' will appear in the resulting time text even they are not
* embraced within single quotes.
* </p>
*
* <p>
* [Time Zone Handling] Web browsers don't provide all the information we need
* for proper time zone formating -- so GWT has a copy of the required data, for
* your convenience. For simpler cases, one can also use a fallback
* implementation that only keeps track of the current timezone offset. These
* two approaches are called, respectively, Common TimeZones and Simple
* TimeZones, although both are implemented with the same TimeZone class.
*
* "TimeZone createTimeZone(String timezoneData)" returns a Common TimeZone
* object, and "TimeZone createTimeZone(int timeZoneOffsetInMinutes)" returns a
* Simple TimeZone object. The one provided by OS fall into to Simple TimeZone
* category. For formatting purpose, following table shows the behavior of GWT
* DateTimeFormat.
* </p>
* <table>
* <tr>
* <th>Pattern</th>
* <th>Common TimeZone</th>
* <th>Simple TimeZone</th>
* </tr>
* <tr>
* <td>z, zz, zzz</td>
* <td>PDT</td>
* <td>UTC-7</td>
* </tr>
* <tr>
* <td>zzzz</td>
* <td>Pacific Daylight Time</td>
* <td>UTC-7</td>
* </tr>
* <tr>
* <td>Z, ZZ, ZZZ</td>
* <td>-0700</td>
* <td>-0700</td>
* </tr>
* <tr>
* <td>ZZZZ</td>
* <td>GMT-07:00</td>
* <td>GMT-07:00</td>
* </tr>
* <tr>
* <td>v, vv, vvv, vvvv</td>
* <td>America/Los_Angeles</td>
* <td>Etc/GMT+7</td>
* </tr>
* </table>
*
* <h3>Parsing Dates and Times</h3>
* <p>
* The pattern does not need to specify every field. If the year, month, or
* day is missing from the pattern, the corresponding value will be taken from
* the current date. If the hour, minute, or second is missing, the value
* defaults to zero.
* </p>
*
* <p>
* As with formatting (described above), the count of pattern letters determines
* the parsing behavior.
* </p>
*
* <dl>
* <dt>Text</dt>
* <dd>4 or more pattern letters--use full form, less than 4--use short or
* abbreviated form if one exists. In parsing, we will always try long format,
* then short.</dd>
*
* <dt>Number</dt>
* <dd>the minimum number of digits.</dd>
*
* <dt>Text or Number</dt>
* <dd>3 or more characters means use text, otherwise use number</dd>
* </dl>
*
* <p>
* Although the current pattern specification doesn't not specify behavior for
* all letters, it may in the future. It is strongly discouraged to use
* unspecified letters as literal text without quoting them.
* </p>
* <p>
* [Note on TimeZone] The time zone support for parsing is limited. Only
* standard GMT and RFC format are supported. Time zone specification using time
* zone id (like America/Los_Angeles), time zone names (like PST, Pacific
* Standard Time) are not supported. Normally, it is too much a burden for a
* client application to load all the time zone symbols. And in almost all those
* cases, it is a better choice to do such parsing on server side through
* certain RPC mechanism. This decision is based on particular use cases we have
* studied; in principle, it could be changed in future versions.
* </p>
*
* <h3>Examples</h3>
* <table>
* <tr>
* <th>Pattern</th>
* <th>Formatted Text</th>
* </tr>
*
* <tr>
* <td><code>"yyyy.MM.dd G 'at' HH:mm:ss vvvv"</code></td>
* <td><code>1996.07.10 AD at 15:08:56 America/Los_Angeles</code></td>
* </tr>
*
* <tr>
* <td><code>"EEE, MMM d, ''yy"</code></td>
* <td><code>Wed, July 10, '96</code></td>
* </tr>
*
* <tr>
* <td><code>"h:mm a"</code></td>
* <td><code>12:08 PM</code></td>
* </tr>
*
* <tr>
* <td><code>"hh 'o''clock' a, zzzz"</code></td>
* <td><code> 12 o'clock PM, Pacific Daylight Time</code></td>
* </tr>
*
* <tr>
* <td><code>"K:mm a, vvvv"</code></td>
* <td><code> 0:00 PM, America/Los_Angeles</code></td>
* </tr>
*
* <tr>
* <td><code>"yyyyy.MMMMM.dd GGG hh:mm aaa"</code></td>
* <td><code>01996.July.10 AD 12:08 PM</code></td>
* </tr>
* </table>
*
* <h3>Additional Parsing Considerations</h3>
* <p>
* When parsing a date string using the abbreviated year pattern (
* <code>"yy"</code>), the parser 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 parser instance is created. For example,
* using a pattern of <code>"MM/dd/yy"</code> and a <code>DateTimeFormat</code>
* object created on Jan 1, 1997, the string <code>"01/11/12"</code> would be
* interpreted as Jan 11, 2012 while the string <code>"05/04/64"</code> would be
* interpreted as May 4, 1964. During parsing, only strings consisting of
* exactly two digits, as defined by {@link java.lang.Character#isDigit(char)},
* will be parsed into the default century. If the year pattern does not have
* exactly two 'y' characters, the year is interpreted literally, regardless of
* the number of digits. For example, using the pattern
* <code>"MM/dd/yyyy"</code>, "01/11/12" parses to Jan 11, 12 A.D.
* </p>
*
* <p>
* When numeric fields abut one another directly, with no intervening delimiter
* characters, they constitute a run of abutting numeric fields. Such runs are
* parsed specially. For example, the format "HHmmss" parses the input text
* "123456" to 12:34:56, parses the input text "12345" to 1:23:45, and fails to
* parse "1234". In other words, the leftmost field of the run is flexible,
* while the others keep a fixed width. If the parse fails anywhere in the run,
* then the leftmost field is shortened by one character, and the entire run is
* parsed again. This is repeated until either the parse succeeds or the
* leftmost field is one character in length. If the parse still fails at that
* point, the parse of the run fails.
* </p>
*
* <p>
* In the current implementation, timezone parsing only supports
* <code>GMT:hhmm</code>, <code>GMT:+hhmm</code>, and <code>GMT:-hhmm</code>.
* </p>
*
* <h3>Example</h3> {@example com.google.gwt.examples.DateTimeFormatExample}
*
*/
@SuppressWarnings("deprecation")
public class DateTimeFormat {
/**
* Class PatternPart holds a "compiled" pattern part.
*/
private static class PatternPart {
public String text;
public int count; // 0 has a special meaning, it stands for literal
public boolean abutStart;
public PatternPart(String txt, int cnt) {
text = txt;
count = cnt;
abutStart = false;
}
}
private static final int FULL_DATE_FORMAT = 0;
private static final int LONG_DATE_FORMAT = 1;
private static final int MEDIUM_DATE_FORMAT = 2;
private static final int SHORT_DATE_FORMAT = 3;
private static final int FULL_TIME_FORMAT = 0;
private static final int LONG_TIME_FORMAT = 1;
private static final int MEDIUM_TIME_FORMAT = 2;
private static final int SHORT_TIME_FORMAT = 3;
private static final int NUMBER_BASE = 10;
private static final int JS_START_YEAR = 1900;
private static DateTimeFormat cachedFullDateFormat;
private static DateTimeFormat cachedLongDateFormat;
private static DateTimeFormat cachedMediumDateFormat;
private static DateTimeFormat cachedShortDateFormat;
private static DateTimeFormat cachedFullTimeFormat;
private static DateTimeFormat cachedLongTimeFormat;
private static DateTimeFormat cachedMediumTimeFormat;
private static DateTimeFormat cachedShortTimeFormat;
private static DateTimeFormat cachedFullDateTimeFormat;
private static DateTimeFormat cachedLongDateTimeFormat;
private static DateTimeFormat cachedMediumDateTimeFormat;
private static DateTimeFormat cachedShortDateTimeFormat;
private static final int NUM_MILLISECONDS_IN_DAY = 24 * 60 * 60000;
private static final String PATTERN_CHARS = "GyMLdkHmsSEcDahKzZv";
// Note: M & L must be the first two characters
private static final String NUMERIC_FORMAT_CHARS = "MLydhHmsSDkK";
private static final String WHITE_SPACE = " \t\r\n";
private static final String GMT = "GMT";
private static final int MINUTES_PER_HOUR = 60;
/**
* Returns a DateTimeFormat object using the specified pattern. If you need to
* format or parse repeatedly using the same pattern, it is highly recommended
* that you cache the returned <code>DateTimeFormat</code> object and reuse it
* rather than calling this method repeatedly.
*
* @param pattern string to specify how the date should be formatted
*
* @return a <code>DateTimeFormat</code> object that can be used for format or
* parse date/time values matching the specified pattern
*
* @throws IllegalArgumentException if the specified pattern could not be
* parsed
*/
public static DateTimeFormat getFormat(String pattern) {
return new DateTimeFormat(pattern, getDefaultDateTimeConstants());
}
/**
* Retrieve the DateTimeFormat object for full date format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getFullDateFormat() {
if (cachedFullDateFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[FULL_DATE_FORMAT];
cachedFullDateFormat = new DateTimeFormat(pattern);
}
return cachedFullDateFormat;
}
/**
* Retrieve the DateTimeFormat object for full date and time format. The
* pattern for this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getFullDateTimeFormat() {
if (cachedFullDateTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[FULL_DATE_FORMAT]
+ " " + getDefaultDateTimeConstants().timeFormats()[FULL_TIME_FORMAT];
cachedFullDateTimeFormat = new DateTimeFormat(pattern);
}
return cachedFullDateTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for full time format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getFullTimeFormat() {
if (cachedFullTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().timeFormats()[FULL_TIME_FORMAT];
cachedFullTimeFormat = new DateTimeFormat(pattern);
}
return cachedFullTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for long date format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getLongDateFormat() {
if (cachedLongDateFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[LONG_DATE_FORMAT];
cachedLongDateFormat = new DateTimeFormat(pattern);
}
return cachedLongDateFormat;
}
/**
* Retrieve the DateTimeFormat object for long date and time format. The
* pattern for this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getLongDateTimeFormat() {
if (cachedLongDateTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[LONG_DATE_FORMAT]
+ " " + getDefaultDateTimeConstants().timeFormats()[LONG_TIME_FORMAT];
cachedLongDateTimeFormat = new DateTimeFormat(pattern);
}
return cachedLongDateTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for long time format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getLongTimeFormat() {
if (cachedLongTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().timeFormats()[LONG_TIME_FORMAT];
cachedLongTimeFormat = new DateTimeFormat(pattern);
}
return cachedLongTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for medium date format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getMediumDateFormat() {
if (cachedMediumDateFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[MEDIUM_DATE_FORMAT];
cachedMediumDateFormat = new DateTimeFormat(pattern);
}
return cachedMediumDateFormat;
}
/**
* Retrieve the DateTimeFormat object for medium date and time format. The
* pattern for this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getMediumDateTimeFormat() {
if (cachedMediumDateTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[MEDIUM_DATE_FORMAT]
+ " " + getDefaultDateTimeConstants().timeFormats()[MEDIUM_TIME_FORMAT];
cachedMediumDateTimeFormat = new DateTimeFormat(pattern);
}
return cachedMediumDateTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for medium time format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getMediumTimeFormat() {
if (cachedMediumTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().timeFormats()[MEDIUM_TIME_FORMAT];
cachedMediumTimeFormat = new DateTimeFormat(pattern);
}
return cachedMediumTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for short date format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getShortDateFormat() {
if (cachedShortDateFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[SHORT_DATE_FORMAT];
cachedShortDateFormat = new DateTimeFormat(pattern);
}
return cachedShortDateFormat;
}
/**
* Retrieve the DateTimeFormat object for short date and time format. The
* pattern for this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getShortDateTimeFormat() {
if (cachedShortDateTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().dateFormats()[SHORT_DATE_FORMAT]
+ " " + getDefaultDateTimeConstants().timeFormats()[SHORT_TIME_FORMAT];
cachedShortDateTimeFormat = new DateTimeFormat(pattern);
}
return cachedShortDateTimeFormat;
}
/**
* Retrieve the DateTimeFormat object for short time format. The pattern for
* this format is predefined for each locale.
*
* @return A DateTimeFormat object.
*/
public static DateTimeFormat getShortTimeFormat() {
if (cachedShortTimeFormat == null) {
String pattern = getDefaultDateTimeConstants().timeFormats()[SHORT_TIME_FORMAT];
cachedShortTimeFormat = new DateTimeFormat(pattern);
}
return cachedShortTimeFormat;
}
private static DateTimeConstants getDefaultDateTimeConstants() {
return LocaleInfo.getCurrentLocale().getDateTimeConstants();
}
private final ArrayList<PatternPart> patternParts = new ArrayList<PatternPart>();
private final DateTimeConstants dateTimeConstants;
private final String pattern;
/**
* Constructs a format object using the specified pattern and the date time
* constants for the default locale.
*
* @param pattern string pattern specification
*/
protected DateTimeFormat(String pattern) {
this(pattern, getDefaultDateTimeConstants());
}
/**
* Constructs a format object using the specified pattern and user-supplied
* date time constants.
*
* @param pattern string pattern specification
* @param dateTimeConstants locale specific symbol collection
*/
protected DateTimeFormat(String pattern, DateTimeConstants dateTimeConstants) {
this.pattern = pattern;
this.dateTimeConstants = dateTimeConstants;
/*
* Even though the pattern is only compiled for use in parsing and parsing
* is far less common than formatting, the pattern is still parsed eagerly
* here to fail fast in case the pattern itself is malformed.
*/
parsePattern(pattern);
}
/**
* Format a date object.
*
* @param date the date object being formatted
*
* @return string representation for this date in desired format
*/
public String format(Date date) {
TimeZone timeZone = TimeZone.createTimeZone(date.getTimezoneOffset());
return format(date, timeZone);
}
/**
* Format a date object using specified time zone.
*
* @param date the date object being formatted
* @param timeZone a TimeZone object that holds time zone information
*
* @return string representation for this date in the format defined by this
* object
*/
public String format(Date date, TimeZone timeZone) {
// We use the Date class to calculate each date/time field in order
// to maximize performance and minimize code size.
// JavaScript only provides an API for rendering local time (in the os time
// zone). Here we want to render time in any timezone. So suppose we try to
// render the date (20:00 GMT0000, or 16:00 GMT-0400, or 12:00 GMT-0800) for
// time zone GMT-0400, and OS has time zone GMT-0800. By adding the
// difference between OS time zone (GMT-0800) and target time zone
// (GMT-0400) to "date", we end up with 16:00 GMT-0800. This date object
// has the same date/time fields (year, month, date, hour, minutes, etc)
// in GMT-0800 as original date in our target time zone (GMT-0400). We
// just need to take care of time zone display, but that's needed anyway.
// Things get a little bit more tricky when a daylight time transition
// happens. For example, if the OS timezone is America/Los_Angeles,
// it is just impossible to have a Date represent 2006/4/2 02:30, because
// 2:00 to 3:00 on that day does not exist in US Pacific time zone because
// of the daylight time switch.
// But we can use 2 separate date objects, one to represent 2006/4/2, one
// to represent 02:30. Of course, for the 2nd date object its date can be
// any other day in that year, except 2006/4/2. So we end up have 3 Date
// objects: one for resolving "Year, month, day", one for time within that
// day, and the original date object, which is needed for figuring out
// actual time zone offset.
int diff = (date.getTimezoneOffset() - timeZone.getOffset(date)) * 60000;
Date keepDate = new Date(date.getTime() + diff);
Date keepTime = keepDate;
if (keepDate.getTimezoneOffset() != date.getTimezoneOffset()) {
if (diff > 0) {
diff -= NUM_MILLISECONDS_IN_DAY;
} else {
diff += NUM_MILLISECONDS_IN_DAY;
}
keepTime = new Date(date.getTime() + diff);
}
StringBuffer toAppendTo = new StringBuffer(64);
int j, n = pattern.length();
for (int i = 0; i < n;) {
char ch = pattern.charAt(i);
if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
// ch is a date-time pattern character to be interpreted by subFormat().
// Count the number of times it is repeated.
for (j = i + 1; j < n && pattern.charAt(j) == ch; ++j) {
}
subFormat(toAppendTo, ch, j - i, date, keepDate, keepTime, timeZone);
i = j;
} else if (ch == '\'') {
// Handle an entire quoted string, included embedded
// doubled apostrophes (as in 'o''clock').
// i points after '.
++i;
// If start with '', just add ' and continue.
if (i < n && pattern.charAt(i) == '\'') {
toAppendTo.append('\'');
++i;
continue;
}
// Otherwise add the quoted string.
boolean trailQuote = false;
while (!trailQuote) {
// j points to next ' or EOS.
j = i;
while (j < n && pattern.charAt(j) != '\'') {
++j;
}
if (j >= n) {
// Trailing ' (pathological).
throw new IllegalArgumentException("Missing trailing \'");
}
// Look ahead to detect '' within quotes.
if (j + 1 < n && pattern.charAt(j + 1) == '\'') {
++j;
} else {
trailQuote = true;
}
toAppendTo.append(pattern.substring(i, j));
i = j + 1;
}
} else {
// Append unquoted literal characters.
toAppendTo.append(ch);
++i;
}
}
return toAppendTo.toString();
}
/**
* Retrieve the pattern used in this DateTimeFormat object.
*
* @return pattern string
*/
public String getPattern() {
return pattern;
}
/**
* Parses text to produce a {@link Date} value. An
* {@link IllegalArgumentException} is thrown if either the text is empty or
* if the parse does not consume all characters of the text.
*
* Dates are parsed leniently, so invalid dates will be wrapped around as
* needed. For example, February 30 will wrap to March 2.
*
* @param text the string being parsed
* @return a parsed date/time value
* @throws IllegalArgumentException if the entire text could not be converted
* into a number
*/
public Date parse(String text) throws IllegalArgumentException {
return parse(text, false);
}
/**
* This method modifies a {@link Date} object to reflect the date that is
* parsed from an input string.
*
* Dates are parsed leniently, so invalid dates will be wrapped around as
* needed. For example, February 30 will wrap to March 2.
*
* @param text the string that need to be parsed
* @param start the character position in "text" where parsing should start
* @param date the date object that will hold parsed value
*
* @return 0 if parsing failed, otherwise the number of characters advanced
*/
public int parse(String text, int start, Date date) {
return parse(text, start, date, false);
}
/**
* Parses text to produce a {@link Date} value. An
* {@link IllegalArgumentException} is thrown if either the text is empty or
* if the parse does not consume all characters of the text.
*
* Dates are parsed strictly, so invalid dates will result in an
* {@link IllegalArgumentException}.
*
* @param text the string being parsed
* @return a parsed date/time value
* @throws IllegalArgumentException if the entire text could not be converted
* into a number
*/
public Date parseStrict(String text) throws IllegalArgumentException {
return parse(text, true);
}
/**
* This method modifies a {@link Date} object to reflect the date that is
* parsed from an input string.
*
* Dates are parsed strictly, so invalid dates will return 0. For example,
* February 30 will return 0 because February only has 28 days.
*
* @param text the string that need to be parsed
* @param start the character position in "text" where parsing should start
* @param date the date object that will hold parsed value
*
* @return 0 if parsing failed, otherwise the number of characters advanced
*/
public int parseStrict(String text, int start, Date date) {
return parse(text, start, date, true);
}
/**
* Method append current content in buf as pattern part if there is any, and
* clear buf for next part.
*
* @param buf pattern part text specification
* @param count pattern part repeat count
*/
private void addPart(StringBuffer buf, int count) {
if (buf.length() > 0) {
patternParts.add((new PatternPart(buf.toString(), count)));
buf.setLength(0);
}
}
/**
* Formats (0..11) Hours field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void format0To11Hours(StringBuffer buf, int count, Date date) {
int value = date.getHours() % 12;
zeroPaddingNumber(buf, value, count);
}
/**
* Formats (0..23) Hours field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void format0To23Hours(StringBuffer buf, int count, Date date) {
int value = date.getHours();
zeroPaddingNumber(buf, value, count);
}
/**
* Formats (1..12) Hours field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void format1To12Hours(StringBuffer buf, int count, Date date) {
int value = date.getHours() % 12;
if (value == 0) {
zeroPaddingNumber(buf, 12, count);
} else {
zeroPaddingNumber(buf, value, count);
}
}
/**
* Formats (1..24) Hours field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void format24Hours(StringBuffer buf, int count, Date date) {
int value = date.getHours();
if (value == 0) {
zeroPaddingNumber(buf, 24, count);
} else {
zeroPaddingNumber(buf, value, count);
}
}
/**
* Formats AM/PM field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param date hold the date object to be formatted
*/
private void formatAmPm(StringBuffer buf, Date date) {
if (date.getHours() >= 12 && date.getHours() < 24) {
buf.append(dateTimeConstants.ampms()[1]);
} else {
buf.append(dateTimeConstants.ampms()[0]);
}
}
/**
* Formats Date field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatDate(StringBuffer buf, int count, Date date) {
int value = date.getDate();
zeroPaddingNumber(buf, value, count);
}
/**
* Formats Day of week field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatDayOfWeek(StringBuffer buf, int count, Date date) {
int value = date.getDay();
if (count == 5) {
buf.append(dateTimeConstants.narrowWeekdays()[value]);
} else if (count == 4) {
buf.append(dateTimeConstants.weekdays()[value]);
} else {
buf.append(dateTimeConstants.shortWeekdays()[value]);
}
}
/**
* Formats Era field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatEra(StringBuffer buf, int count, Date date) {
int value = date.getYear() >= -JS_START_YEAR ? 1 : 0;
if (count >= 4) {
buf.append(dateTimeConstants.eraNames()[value]);
} else {
buf.append(dateTimeConstants.eras()[value]);
}
}
/**
* Formats Fractional seconds field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatFractionalSeconds(StringBuffer buf, int count, Date date) {
/*
* Fractional seconds should be left-justified, ie. zero must be padded from
* left. For example, if the value in milliseconds is 5, and the count is 3,
* the output will be "005".
*
* Values with less than three digits are rounded to the desired number of
* places, but the rounded values are truncated at 9 or 99 in order to avoid
* changing the values of seconds.
*/
long time = date.getTime();
int value;
if (time < 0) {
value = 1000 - (int) (-time % 1000);
} else {
value = (int) (time % 1000);
}
if (count == 1) {
value = Math.min((value + 50) / 100, 9); // Round to 100ms, clamp to 9
buf.append((char) ('0' + value));
} else if (count == 2) {
value = Math.min((value + 5) / 10, 99); // Round to 10ms, clamp to 99
zeroPaddingNumber(buf, value, 2);
} else {
zeroPaddingNumber(buf, value, 3);
if (count > 3) {
zeroPaddingNumber(buf, 0, count - 3);
}
}
}
/**
* Formats Minutes field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatMinutes(StringBuffer buf, int count, Date date) {
int value = date.getMinutes();
zeroPaddingNumber(buf, value, count);
}
/**
* Formats Month field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatMonth(StringBuffer buf, int count, Date date) {
int value = date.getMonth();
switch (count) {
case 5:
buf.append(dateTimeConstants.narrowMonths()[value]);
break;
case 4:
buf.append(dateTimeConstants.months()[value]);
break;
case 3:
buf.append(dateTimeConstants.shortMonths()[value]);
break;
default:
zeroPaddingNumber(buf, value + 1, count);
}
}
/**
* Formats Quarter field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatQuarter(StringBuffer buf, int count, Date date) {
int value = date.getMonth() / 3;
if (count < 4) {
buf.append(dateTimeConstants.shortQuarters()[value]);
} else {
buf.append(dateTimeConstants.quarters()[value]);
}
}
/**
* Formats Seconds field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatSeconds(StringBuffer buf, int count, Date date) {
int value = date.getSeconds();
zeroPaddingNumber(buf, value, count);
}
/**
* Formats Standalone weekday field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatStandaloneDay(StringBuffer buf, int count, Date date) {
int value = date.getDay();
if (count == 5) {
buf.append(dateTimeConstants.standaloneNarrowWeekdays()[value]);
} else if (count == 4) {
buf.append(dateTimeConstants.standaloneWeekdays()[value]);
} else if (count == 3) {
buf.append(dateTimeConstants.standaloneShortWeekdays()[value]);
} else {
zeroPaddingNumber(buf, value, 1);
}
}
/**
* Formats Standalone Month field according to pattern specified.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatStandaloneMonth(StringBuffer buf, int count, Date date) {
int value = date.getMonth();
if (count == 5) {
buf.append(dateTimeConstants.standaloneNarrowMonths()[value]);
} else if (count == 4) {
buf.append(dateTimeConstants.standaloneMonths()[value]);
} else if (count == 3) {
buf.append(dateTimeConstants.standaloneShortMonths()[value]);
} else {
zeroPaddingNumber(buf, value + 1, count);
}
}
/**
* Formats Timezone field.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatTimeZone(StringBuffer buf, int count, Date date,
TimeZone timeZone) {
if (count < 4) {
buf.append(timeZone.getShortName(date));
} else {
buf.append(timeZone.getLongName(date));
}
}
/**
* Formats Timezone field following RFC.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatTimeZoneRFC(StringBuffer buf, int count, Date date,
TimeZone timeZone) {
if (count < 4) {
buf.append(timeZone.getRFCTimeZoneString(date));
} else {
buf.append(timeZone.getGMTString(date));
}
}
/**
* Formats Year field according to pattern specified. Javascript Date object
* seems incapable handling 1BC and year before. It can show you year 0 which
* does not exists. following we just keep consistent with javascript's
* toString method. But keep in mind those things should be unsupported.
*
* @param buf where formatted string will be appended to
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date hold the date object to be formatted
*/
private void formatYear(StringBuffer buf, int count, Date date) {
int value = date.getYear() + JS_START_YEAR;
if (value < 0) {
value = -value;
}
if (count == 2) {
zeroPaddingNumber(buf, value % 100, 2);
} else {
// count != 2
buf.append(value);
}
}
/**
* Method getNextCharCountInPattern calculate character repeat count in
* pattern.
*
* @param pattern describe the format of date string that need to be parsed
* @param start the position of pattern character
* @return repeat count
*/
private int getNextCharCountInPattern(String pattern, int start) {
char ch = pattern.charAt(start);
int next = start + 1;
while (next < pattern.length() && pattern.charAt(next) == ch) {
++next;
}
return next - start;
}
/**
* Method identifies the start of a run of abutting numeric fields. Take the
* pattern "HHmmss" as an example. We will try to parse 2/2/2 characters of
* the input text, then if that fails, 1/2/2. We only adjust the width of the
* leftmost field; the others remain fixed. This allows "123456" => 12:34:56,
* but "12345" => 1:23:45. Likewise, for the pattern "yyyyMMdd" we try 4/2/2,
* 3/2/2, 2/2/2, and finally 1/2/2. The first field of connected numeric
* fields will be marked as abutStart, its width can be reduced to accomodate
* others.
*/
private void identifyAbutStart() {
// 'abut' parts are continuous numeric parts. abutStart is the switch
// point from non-abut to abut.
boolean abut = false;
int len = patternParts.size();
for (int i = 0; i < len; i++) {
if (isNumeric(patternParts.get(i))) {
// If next part is not following abut sequence, and isNumeric.
if (!abut && i + 1 < len && isNumeric(patternParts.get(i + 1))) {
abut = true;
patternParts.get(i).abutStart = true;
}
} else {
abut = false;
}
}
}
/**
* Method checks if the pattern part is a numeric field.
*
* @param part pattern part to be examined
* @return <code>true</code> if the pattern part is numberic field
*/
private boolean isNumeric(PatternPart part) {
if (part.count <= 0) {
return false;
}
int i = NUMERIC_FORMAT_CHARS.indexOf(part.text.charAt(0));
// M & L (index 0 and 1) are only numeric if there are less than 3 chars
return (i > 1 || (i >= 0 && part.count < 3));
}
/**
* Method attempts to match the text at a given position against an array of
* strings. Since multiple strings in the array may match (for example, if the
* array contains "a", "ab", and "abc", all will match the input string
* "abcd") the longest match is returned.
*
* @param text the time text being parsed
* @param start where to start parsing
* @param data the string array to parsed
* @param pos to receive where the match stopped
* @return the new start position if matching succeeded; a negative number
* indicating matching failure
*/
private int matchString(String text, int start, String[] data, int[] pos) {
int count = data.length;
// 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;
String textInLowerCase = text.substring(start).toLowerCase();
for (int i = 0; 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
&& textInLowerCase.startsWith(data[i].toLowerCase())) {
bestMatch = i;
bestMatchLength = length;
}
}
if (bestMatch >= 0) {
pos[0] = start + bestMatchLength;
}
return bestMatch;
}
/**
* Parses text to produce a {@link Date} value. An
* {@link IllegalArgumentException} is thrown if either the text is empty or
* if the parse does not consume all characters of the text.
*
* If using lenient parsing, certain invalid dates and times will be parsed.
* For example, February 32nd would be parsed as March 4th in lenient mode,
* but would throw an exception in non-lenient mode.
*
* @param text the string being parsed
* @param strict true to be strict when parsing, false to be lenient
* @return a parsed date/time value
* @throws IllegalArgumentException if the entire text could not be converted
* into a number
*/
private Date parse(String text, boolean strict) {
Date curDate = new Date();
Date date = new Date(curDate.getYear(), curDate.getMonth(),
curDate.getDate());
int charsConsumed = parse(text, 0, date, strict);
if (charsConsumed == 0 || charsConsumed < text.length()) {
throw new IllegalArgumentException(text);
}
return date;
}
/**
* This method parses the input string and fills its value into a {@link Date}
* .
*
* If using lenient parsing, certain invalid dates and times will be parsed.
* For example, February 32nd would be parsed as March 4th in lenient mode,
* but would return 0 in non-lenient mode.
*
* @param text the string that need to be parsed
* @param start the character position in "text" where parsing should start
* @param date the date object that will hold parsed value
* @param strict true to be strict when parsingm false to be lenient
*
* @return 0 if parsing failed, otherwise the number of characters advanced
*/
private int parse(String text, int start, Date date, boolean strict) {
DateRecord cal = new DateRecord();
int[] parsePos = {start};
// For parsing abutting numeric fields. 'abutPat' is the
// offset into 'pattern' of the first of 2 or more abutting
// numeric fields. 'abutStart' is the offset into 'text'
// where parsing the fields begins. 'abutPass' starts off as 0
// and increments each time we try to parse the fields.
int abutPat = -1; // If >=0, we are in a run of abutting numeric fields.
int abutStart = 0;
int abutPass = 0;
for (int i = 0; i < patternParts.size(); ++i) {
PatternPart part = patternParts.get(i);
if (part.count > 0) {
if (abutPat < 0 && part.abutStart) {
abutPat = i;
abutStart = start;
abutPass = 0;
}
// Handle fields within a run of abutting numeric fields. Take
// the pattern "HHmmss" as an example. We will try to parse
// 2/2/2 characters of the input text, then if that fails,
// 1/2/2. We only adjust the width of the leftmost field; the
// others remain fixed. This allows "123456" => 12:34:56, but
// "12345" => 1:23:45. Likewise, for the pattern "yyyyMMdd" we
// try 4/2/2, 3/2/2, 2/2/2, and finally 1/2/2.
if (abutPat >= 0) {
// If we are at the start of a run of abutting fields, then
// shorten this field in each pass. If we can't shorten
// this field any more, then the parse of this set of
// abutting numeric fields has failed.
int count = part.count;
if (i == abutPat) {
count -= abutPass++;
if (count == 0) {
return 0;
}
}
if (!subParse(text, parsePos, part, count, cal)) {
// If the parse fails anywhere in the run, back up to the
// start of the run and retry.
i = abutPat - 1;
parsePos[0] = abutStart;
continue;
}
} else {
// Handle non-numeric fields and non-abutting numeric fields.
abutPat = -1;
if (!subParse(text, parsePos, part, 0, cal)) {
return 0;
}
}
} else {
// Handle literal pattern characters. These are any
// quoted characters and non-alphabetic unquoted characters.
abutPat = -1;
// A run of white space in the pattern matches a run
// of white space in the input text.
if (part.text.charAt(0) == ' ') {
// Advance over run in input text.
int s = parsePos[0];
skipSpace(text, parsePos);
// Must see at least one white space char in input.
if (parsePos[0] > s) {
continue;
}
} else if (text.startsWith(part.text, parsePos[0])) {
parsePos[0] += part.text.length();
continue;
}
// We fall through to this point if the match fails.
return 0;
}
}
// Calculate the date from the parts
if (!cal.calcDate(date, strict)) {
return 0;
}
// Return progress.
return parsePos[0] - start;
}
/**
* Method parses a integer string and return integer value.
*
* @param text string being parsed
* @param pos parse position
*
* @return integer value
*/
private int parseInt(String text, int[] pos) {
int ret = 0;
int ind = pos[0];
char ch = text.charAt(ind);
while (ch >= '0' && ch <= '9') {
ret = ret * 10 + (ch - '0');
ind++;
if (ind >= text.length()) {
break;
}
ch = text.charAt(ind);
}
if (ind > pos[0]) {
pos[0] = ind;
} else {
ret = -1;
}
return ret;
}
/**
* Method parses the input pattern string a generate a vector of pattern
* parts.
*
* @param pattern describe the format of date string that need to be parsed
*/
private void parsePattern(String pattern) {
StringBuffer buf = new StringBuffer(32);
boolean inQuote = false;
for (int i = 0; i < pattern.length(); i++) {
char ch = pattern.charAt(i);
// Handle space, add literal part (if exist), and add space part.
if (ch == ' ') {
addPart(buf, 0);
buf.append(' ');
addPart(buf, 0);
while (i + 1 < pattern.length() && pattern.charAt(i + 1) == ' ') {
i++;
}
continue;
}
// If inside quote, except two quote connected, just copy or exit.
if (inQuote) {
if (ch == '\'') {
if (i + 1 < pattern.length() && pattern.charAt(i + 1) == '\'') {
// Quote appeared twice continuously, interpret as one quote.
buf.append(ch);
++i;
} else {
inQuote = false;
}
} else {
// Literal.
buf.append(ch);
}
continue;
}
// Outside quote now.
if (PATTERN_CHARS.indexOf(ch) > 0) {
addPart(buf, 0);
buf.append(ch);
int count = getNextCharCountInPattern(pattern, i);
addPart(buf, count);
i += count - 1;
continue;
}
// Two consecutive quotes is a quote literal, inside or outside of quotes.
if (ch == '\'') {
if (i + 1 < pattern.length() && pattern.charAt(i + 1) == '\'') {
buf.append('\'');
i++;
} else {
inQuote = true;
}
} else {
buf.append(ch);
}
}
addPart(buf, 0);
identifyAbutStart();
}
/**
* Method parses time zone offset.
*
* @param text the time text to be parsed
* @param pos Parse position
* @param cal DateRecord object that holds parsed value
*
* @return <code>true</code> if parsing successful, otherwise
* <code>false</code>
*/
private boolean parseTimeZoneOffset(String text, int[] pos, DateRecord cal) {
if (pos[0] >= text.length()) {
cal.setTzOffset(0);
return true;
}
int sign;
switch (text.charAt(pos[0])) {
case '+':
sign = 1;
break;
case '-':
sign = -1;
break;
default:
cal.setTzOffset(0);
return true;
}
++(pos[0]);
// Look for hours:minutes or hhmm.
int st = pos[0];
int value = parseInt(text, pos);
if (value == 0 && pos[0] == st) {
return false;
}
int offset;
if (pos[0] < text.length() && text.charAt(pos[0]) == ':') {
// This is the hours:minutes case.
offset = value * MINUTES_PER_HOUR;
++(pos[0]);
st = pos[0];
value = parseInt(text, pos);
if (value == 0 && pos[0] == st) {
return false;
}
offset += value;
} else {
// This is the hhmm case.
offset = value;
// Assume "-23".."+23" refers to hours.
if (offset < 24 && (pos[0] - st) <= 2) {
offset *= MINUTES_PER_HOUR;
} else {
offset = offset % 100 + offset / 100 * MINUTES_PER_HOUR;
}
}
offset *= sign;
cal.setTzOffset(-offset);
return true;
}
/**
* Method skips space in the string as pointed by pos.
*
* @param text input string
* @param pos where skip start, and return back where skip stop
*/
private void skipSpace(String text, int[] pos) {
while (pos[0] < text.length()
&& WHITE_SPACE.indexOf(text.charAt(pos[0])) >= 0) {
++(pos[0]);
}
}
/**
* Formats a single field according to pattern specified.
*
* @param ch pattern character for this field
* @param count number of time pattern char repeats; this controls how a field
* should be formatted
* @param date the date object to be formatted
* @param adjustedDate holds the time zone adjusted date fields
* @param adjustedTime holds the time zone adjusted time fields
*
* @return <code>true</code> if pattern valid, otherwise <code>false</code>
*
*/
private boolean subFormat(StringBuffer buf, char ch, int count, Date date,
Date adjustedDate, Date adjustedTime, TimeZone timezone) {
switch (ch) {
case 'G':
formatEra(buf, count, adjustedDate);
break;
case 'y':
formatYear(buf, count, adjustedDate);
break;
case 'M':
formatMonth(buf, count, adjustedDate);
break;
case 'k':
format24Hours(buf, count, adjustedTime);
break;
case 'S':
formatFractionalSeconds(buf, count, adjustedTime);
break;
case 'E':
formatDayOfWeek(buf, count, adjustedDate);
break;
case 'a':
formatAmPm(buf, adjustedTime);
break;
case 'h':
format1To12Hours(buf, count, adjustedTime);
break;
case 'K':
format0To11Hours(buf, count, adjustedTime);
break;
case 'H':
format0To23Hours(buf, count, adjustedTime);
break;
case 'c':
formatStandaloneDay(buf, count, adjustedDate);
break;
case 'L':
formatStandaloneMonth(buf, count, adjustedDate);
break;
case 'Q':
formatQuarter(buf, count, adjustedDate);
break;
case 'd':
formatDate(buf, count, adjustedDate);
break;
case 'm':
formatMinutes(buf, count, adjustedTime);
break;
case 's':
formatSeconds(buf, count, adjustedTime);
break;
case 'z':
formatTimeZone(buf, count, date, timezone);
break;
case 'v':
buf.append(timezone.getID());
break;
case 'Z':
formatTimeZoneRFC(buf, count, date, timezone);
break;
default:
return false;
}
return true;
}
/**
* Converts one field of the input string into a numeric field value. Returns
* <code>false</code> if failed.
*
* @param text the time text to be parsed
* @param pos Parse position
* @param part the pattern part for this field
* @param digitCount when greater than 0, numeric parsing must obey the count
* @param cal DateRecord object that will hold parsed value
*
* @return <code>true</code> if parsing successful
*/
@SuppressWarnings("fallthrough")
private boolean subParse(String text, int[] pos, PatternPart part,
int digitCount, DateRecord cal) {
skipSpace(text, pos);
int start = pos[0];
char ch = part.text.charAt(0);
// Parse integer value if it is a numeric field.
int value = -1; // initialize value to be -1,
if (isNumeric(part)) {
if (digitCount > 0) {
if ((start + digitCount) > text.length()) {
return false;
}
value = parseInt(text.substring(0, start + digitCount), pos);
} else {
value = parseInt(text, pos);
}
}
switch (ch) {
case 'G': // era
value = matchString(text, start, dateTimeConstants.eras(), pos);
cal.setEra(value);
return true;
case 'M': // month
return subParseMonth(text, pos, cal, value, start);
case 'L': // standalone month
return subParseStandaloneMonth(text, pos, cal, value, start);
case 'E': // day of week
return subParseDayOfWeek(text, pos, start, cal);
case 'c': // standalone day of week
return subParseStandaloneDay(text, pos, start, cal);
case 'a': // AM/PM
value = matchString(text, start, dateTimeConstants.ampms(), pos);
cal.setAmpm(value);
return true;
case 'y': // year
return subParseYear(text, pos, start, value, part, cal);
case 'd': // day of month
if (value <= 0) {
return false;
}
cal.setDayOfMonth(value);
return true;
case 'S': // fractional seconds
return subParseFractionalSeconds(value, start, pos[0], cal);
case 'h': // hour (1..12)
if (value == 12) {
value = 0;
}
// fall through
case 'K': // hour (0..11)
case 'H': // hour (0..23)
cal.setHours(value);
return true;
case 'k': // hour (1..24)
cal.setHours(value);
return true;
case 'm': // minute
cal.setMinutes(value);
return true;
case 's': // second
cal.setSeconds(value);
return true;
case 'z': // time zone offset
case 'Z': // time zone RFC
case 'v': // time zone generic
return subParseTimeZoneInGMT(text, start, pos, cal);
default:
return false;
}
}
/**
* Method subParseDayOfWeek parses day of the week field.
*
* @param text the time text to be parsed
* @param pos Parse position
* @param start from where parse start
* @param cal DateRecord object that holds parsed value
*
* @return <code>true</code> if parsing successful, otherwise
* <code>false</code>
*/
private boolean subParseDayOfWeek(String text, int[] pos, int start,
DateRecord cal) {
int value;
// 'E' - DAY_OF_WEEK
// Want to be able to parse both short and long forms.
// Try count == 4 (DDDD) first:
value = matchString(text, start, dateTimeConstants.weekdays(), pos);
if (value < 0) {
value = matchString(text, start, dateTimeConstants.shortWeekdays(), pos);
}
if (value < 0) {
return false;
}
cal.setDayOfWeek(value);
return true;
}
/**
* Method subParseFractionalSeconds parses fractional seconds field.
*
* @param value parsed numberic value
* @param start
* @param end parse position
* @param cal DateRecord object that holds parsed value
* @return <code>true</code> if parsing successful, otherwise
* <code>false</code>
*/
private boolean subParseFractionalSeconds(int value, int start, int end,
DateRecord cal) {
// Fractional seconds left-justify.
int i = end - start;
if (i < 3) {
while (i < 3) {
value *= 10;
i++;
}
} else {
int a = 1;
while (i > 3) {
a *= 10;
i--;
}
value = (value + (a >> 1)) / a;
}
cal.setMilliseconds(value);
return true;
}
/**
* Parses Month field.
*
* @param text the time text to be parsed
* @param pos Parse position
* @param cal DateRecord object that will hold parsed value
* @param value numeric value if this field is expressed using numberic
* pattern
* @param start from where parse start
*
* @return <code>true</code> if parsing successful
*/
private boolean subParseMonth(String text, int[] pos, DateRecord cal,
int value, int start) {
// When month is symbols, i.e., MMM or MMMM, value will be -1.
if (value < 0) {
// Want to be able to parse both short and long forms.
// Try count == 4 first:
value = matchString(text, start, dateTimeConstants.months(), pos);
if (value < 0) { // count == 4 failed, now try count == 3.
value = matchString(text, start, dateTimeConstants.shortMonths(), pos);
}
if (value < 0) {
return false;
}
cal.setMonth(value);
return true;
} else if (value > 0) {
cal.setMonth(value - 1);
return true;
}
return false;
}
/**
* Parses standalone day of the week field.
*
* @param text the time text to be parsed
* @param pos Parse position
* @param start from where parse start
* @param cal DateRecord object that holds parsed value
*
* @return <code>true</code> if parsing successful, otherwise
* <code>false</code>
*/
private boolean subParseStandaloneDay(String text, int[] pos, int start,
DateRecord cal) {
int value;
// 'c' - DAY_OF_WEEK
// Want to be able to parse both short and long forms.
// Try count == 4 (cccc) first:
value = matchString(text, start, dateTimeConstants.standaloneWeekdays(),
pos);
if (value < 0) {
value = matchString(text, start,
dateTimeConstants.standaloneShortWeekdays(), pos);
}
if (value < 0) {
return false;
}
cal.setDayOfWeek(value);
return true;
}
/**
* Parses a standalone month field.
*
* @param text the time text to be parsed
* @param pos Parse position
* @param cal DateRecord object that will hold parsed value
* @param value numeric value if this field is expressed using numberic
* pattern
* @param start from where parse start
*
* @return <code>true</code> if parsing successful
*/
private boolean subParseStandaloneMonth(String text, int[] pos,
DateRecord cal, int value, int start) {
// When month is symbols, i.e., LLL or LLLL, value will be -1.
if (value < 0) {
// Want to be able to parse both short and long forms.
// Try count == 4 first:
value = matchString(text, start,
dateTimeConstants.standaloneMonths(), pos);
if (value < 0) { // count == 4 failed, now try count == 3.
value = matchString(text, start,
dateTimeConstants.standaloneShortMonths(), pos);
}
if (value < 0) {
return false;
}
cal.setMonth(value);
return true;
} else if (value > 0) {
cal.setMonth(value - 1);
return true;
}
return false;
}
/**
* Method parses GMT type timezone.
*
* @param text the time text to be parsed
* @param start from where parse start
* @param pos Parse position
* @param cal DateRecord object that holds parsed value
*
* @return <code>true</code> if parsing successful, otherwise
* <code>false</code>
*/
private boolean subParseTimeZoneInGMT(String text, int start, int[] pos,
DateRecord cal) {
// First try to parse generic forms such as GMT-07:00. Do this first
// in case localized DateFormatZoneData contains the string "GMT"
// for a zone; in that case, we don't want to match the first three
// characters of GMT+/-HH:MM etc.
// For time zones that have no known names, look for strings
// of the form:
// GMT[+-]hours:minutes or
// GMT[+-]hhmm or
// GMT.
if (text.startsWith(GMT, start)) {
pos[0] = start + GMT.length();
return parseTimeZoneOffset(text, pos, cal);
}
// At this point, check for named time zones by looking through
// the locale data from the DateFormatZoneData strings.
// Want to be able to parse both short and long forms.
/*
* i = subParseZoneString(text, start, cal); if (i != 0) return i;
*/
// As a last resort, look for numeric timezones of the form
// [+-]hhmm as specified by RFC 822. This code is actually
// a little more permissive than RFC 822. It will try to do
// its best with numbers that aren't strictly 4 digits long.
return parseTimeZoneOffset(text, pos, cal);
}
/**
* Method subParseYear parse year field. Year field is special because 1, two
* digit year need to be resolved. 2, we allow year to take a sign. 3, year
* field participate in abut processing. In my testing, negative year does not
* seem working due to JDK (or redpill implementation) limitation. It is not a
* big deal so we don't worry about it. But keep the logic here so that we
* might want to replace DateRecord with our a calendar class.
*
* @param text the time text to be parsed
* @param pos parse position
* @param start where this field star
* @param value integer value of yea
* @param part the pattern part for this field
* @param cal DateRecord object that will hold parsed value
*
* @return <code>true</code> if successful
*/
private boolean subParseYear(String text, int[] pos, int start, int value,
PatternPart part, DateRecord cal) {
char ch = ' ';
if (value < 0) {
ch = text.charAt(pos[0]);
// Check if it is a sign.
if (ch != '+' && ch != '-') {
return false;
}
++(pos[0]);
value = parseInt(text, pos);
if (value < 0) {
return false;
}
if (ch == '-') {
value = -value;
}
}
// no sign, only 2 digit was actually parsed, pattern say it has 2 digit.
if (ch == ' ' && (pos[0] - start) == 2 && part.count == 2) {
// 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.
Date date = new Date();
int defaultCenturyStartYear = date.getYear() + 1900 - 80;
int ambiguousTwoDigitYear = defaultCenturyStartYear % 100;
cal.setAmbiguousYear(value == ambiguousTwoDigitYear);
value += (defaultCenturyStartYear / 100) * 100
+ (value < ambiguousTwoDigitYear ? 100 : 0);
}
cal.setYear(value);
return true;
}
/**
* Formats a number with the specified minimum number of digits, using zero to
* fill the gap.
*
* @param buf where zero padded string will be written to
* @param value the number value being formatted
* @param minWidth minimum width of the formatted string; zero will be padded
* to reach this width
*/
private void zeroPaddingNumber(StringBuffer buf, int value, int minWidth) {
int b = NUMBER_BASE;
for (int i = 0; i < minWidth - 1; i++) {
if (value < b) {
buf.append('0');
}
b *= NUMBER_BASE;
}
buf.append(value);
}
}