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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
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package java.time.format;
import static java.time.temporal.ChronoField.DAY_OF_MONTH;
import static java.time.temporal.ChronoField.DAY_OF_WEEK;
import static java.time.temporal.ChronoField.DAY_OF_YEAR;
import static java.time.temporal.ChronoField.HOUR_OF_DAY;
import static java.time.temporal.ChronoField.MINUTE_OF_HOUR;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoField.SECOND_OF_MINUTE;
import static java.time.temporal.ChronoField.YEAR;
import java.io.IOException;
import java.text.FieldPosition;
import java.text.Format;
import java.text.ParseException;
import java.text.ParsePosition;
import java.time.DateTimeException;
import java.time.Period;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.chrono.Chronology;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatterBuilder.CompositePrinterParser;
import java.time.temporal.ChronoField;
import java.time.temporal.IsoFields;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQuery;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
/**
* Formatter for printing and parsing date-time objects.
* <p>
* This class provides the main application entry point for printing and parsing
* and provides common implementations of {@code DateTimeFormatter}:
* <ul>
* <li>Using predefined constants, such as {@link #ISO_LOCAL_DATE}</li>
* <li>Using pattern letters, such as {@code uuuu-MMM-dd}</li>
* <li>Using localized styles, such as {@code long} or {@code medium}</li>
* </ul>
* <p>
* More complex formatters are provided by
* {@link DateTimeFormatterBuilder DateTimeFormatterBuilder}.
*
* <p>
* The main date-time classes provide two methods - one for formatting,
* {@code format(DateTimeFormatter formatter)}, and one for parsing,
* {@code parse(CharSequence text, DateTimeFormatter formatter)}.
* <p>For example:
* <blockquote><pre>
* LocalDate date = LocalDate.now();
* String text = date.format(formatter);
* LocalDate parsedDate = LocalDate.parse(text, formatter);
* </pre></blockquote>
* <p>
* In addition to the format, formatters can be created with desired Locale,
* Chronology, ZoneId, and DecimalStyle.
* <p>
* The {@link #withLocale withLocale} method returns a new formatter that
* overrides the locale. The locale affects some aspects of formatting and
* parsing. For example, the {@link #ofLocalizedDate ofLocalizedDate} provides a
* formatter that uses the locale specific date format.
* <p>
* The {@link #withChronology withChronology} method returns a new formatter
* that overrides the chronology. If overridden, the date-time value is
* converted to the chronology before formatting. During parsing the date-time
* value is converted to the chronology before it is returned.
* <p>
* The {@link #withZone withZone} method returns a new formatter that overrides
* the zone. If overridden, the date-time value is converted to a ZonedDateTime
* with the requested ZoneId before formatting. During parsing the ZoneId is
* applied before the value is returned.
* <p>
* The {@link #withDecimalStyle withDecimalStyle} method returns a new formatter that
* overrides the {@link DecimalStyle}. The DecimalStyle symbols are used for
* formatting and parsing.
* <p>
* Some applications may need to use the older {@link Format java.text.Format}
* class for formatting. The {@link #toFormat()} method returns an
* implementation of {@code java.text.Format}.
*
* <h3 id="predefined">Predefined Formatters</h3>
* <table summary="Predefined Formatters" cellpadding="2" cellspacing="3" border="0" >
* <thead>
* <tr class="tableSubHeadingColor">
* <th class="colFirst" align="left">Formatter</th>
* <th class="colFirst" align="left">Description</th>
* <th class="colLast" align="left">Example</th>
* </tr>
* </thead>
* <tbody>
* <tr class="rowColor">
* <td>{@link #ofLocalizedDate ofLocalizedDate(dateStyle)} </td>
* <td> Formatter with date style from the locale </td>
* <td> '2011-12-03'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ofLocalizedTime ofLocalizedTime(timeStyle)} </td>
* <td> Formatter with time style from the locale </td>
* <td> '10:15:30'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ofLocalizedDateTime ofLocalizedDateTime(dateTimeStyle)} </td>
* <td> Formatter with a style for date and time from the locale</td>
* <td> '3 Jun 2008 11:05:30'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ofLocalizedDateTime ofLocalizedDateTime(dateStyle,timeStyle)}
* </td>
* <td> Formatter with date and time styles from the locale </td>
* <td> '3 Jun 2008 11:05'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #BASIC_ISO_DATE}</td>
* <td>Basic ISO date </td> <td>'20111203'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ISO_LOCAL_DATE}</td>
* <td> ISO Local Date </td>
* <td>'2011-12-03'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ISO_OFFSET_DATE}</td>
* <td> ISO Date with offset </td>
* <td>'2011-12-03+01:00'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ISO_DATE}</td>
* <td> ISO Date with or without offset </td>
* <td> '2011-12-03+01:00'; '2011-12-03'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ISO_LOCAL_TIME}</td>
* <td> Time without offset </td>
* <td>'10:15:30'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ISO_OFFSET_TIME}</td>
* <td> Time with offset </td>
* <td>'10:15:30+01:00'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ISO_TIME}</td>
* <td> Time with or without offset </td>
* <td>'10:15:30+01:00'; '10:15:30'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ISO_LOCAL_DATE_TIME}</td>
* <td> ISO Local Date and Time </td>
* <td>'2011-12-03T10:15:30'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ISO_OFFSET_DATE_TIME}</td>
* <td> Date Time with Offset
* </td><td>2011-12-03T10:15:30+01:00'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ISO_ZONED_DATE_TIME}</td>
* <td> Zoned Date Time </td>
* <td>'2011-12-03T10:15:30+01:00[Europe/Paris]'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ISO_DATE_TIME}</td>
* <td> Date and time with ZoneId </td>
* <td>'2011-12-03T10:15:30+01:00[Europe/Paris]'</td>
* </tr>
* <tr class="altColor">
* <td> {@link #ISO_ORDINAL_DATE}</td>
* <td> Year and day of year </td>
* <td>'2012-337'</td>
* </tr>
* <tr class="rowColor">
* <td> {@link #ISO_WEEK_DATE}</td>
* <td> Year and Week </td>
* <td>2012-W48-6'</td></tr>
* <tr class="altColor">
* <td> {@link #ISO_INSTANT}</td>
* <td> Date and Time of an Instant </td>
* <td>'2011-12-03T10:15:30Z' </td>
* </tr>
* <tr class="rowColor">
* <td> {@link #RFC_1123_DATE_TIME}</td>
* <td> RFC 1123 / RFC 822 </td>
* <td>'Tue, 3 Jun 2008 11:05:30 GMT'</td>
* </tr>
* </tbody>
* </table>
*
* <h3 id="patterns">Patterns for Formatting and Parsing</h3>
* Patterns are based on a simple sequence of letters and symbols.
* A pattern is used to create a Formatter using the
* {@link #ofPattern(String)} and {@link #ofPattern(String, Locale)} methods.
* For example,
* {@code "d MMM uuuu"} will format 2011-12-03 as '3 Dec 2011'.
* A formatter created from a pattern can be used as many times as necessary,
* it is immutable and is thread-safe.
* <p>
* For example:
* <blockquote><pre>
* LocalDate date = LocalDate.now();
* DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy MM dd");
* String text = date.format(formatter);
* LocalDate parsedDate = LocalDate.parse(text, formatter);
* </pre></blockquote>
* <p>
* All letters 'A' to 'Z' and 'a' to 'z' are reserved as pattern letters. The
* following pattern letters are defined:
* <pre>
* Symbol Meaning Presentation Examples
* ------ ------- ------------ -------
* G era text AD; Anno Domini; A
* u year year 2004; 04
* y year-of-era year 2004; 04
* D day-of-year number 189
* M/L month-of-year number/text 7; 07; Jul; July; J
* d day-of-month number 10
*
* Q/q quarter-of-year number/text 3; 03; Q3; 3rd quarter
* Y week-based-year year 1996; 96
* w week-of-week-based-year number 27
* W week-of-month number 4
* E day-of-week text Tue; Tuesday; T
* e/c localized day-of-week number/text 2; 02; Tue; Tuesday; T
* F week-of-month number 3
*
* a am-pm-of-day text PM
* h clock-hour-of-am-pm (1-12) number 12
* K hour-of-am-pm (0-11) number 0
* k clock-hour-of-am-pm (1-24) number 0
*
* H hour-of-day (0-23) number 0
* m minute-of-hour number 30
* s second-of-minute number 55
* S fraction-of-second fraction 978
* A milli-of-day number 1234
* n nano-of-second number 987654321
* N nano-of-day number 1234000000
*
* V time-zone ID zone-id America/Los_Angeles; Z; -08:30
* z time-zone name zone-name Pacific Standard Time; PST
* O localized zone-offset offset-O GMT+8; GMT+08:00; UTC-08:00;
* X zone-offset 'Z' for zero offset-X Z; -08; -0830; -08:30; -083015; -08:30:15;
* x zone-offset offset-x +0000; -08; -0830; -08:30; -083015; -08:30:15;
* Z zone-offset offset-Z +0000; -0800; -08:00;
*
* p pad next pad modifier 1
*
* ' escape for text delimiter
* '' single quote literal '
* [ optional section start
* ] optional section end
* # reserved for future use
* { reserved for future use
* } reserved for future use
* </pre>
* <p>
* The count of pattern letters determines the format.
* <p>
* <b>Text</b>: The text style is determined based on the number of pattern
* letters used. Less than 4 pattern letters will use the
* {@link TextStyle#SHORT short form}. Exactly 4 pattern letters will use the
* {@link TextStyle#FULL full form}. Exactly 5 pattern letters will use the
* {@link TextStyle#NARROW narrow form}.
* Pattern letters 'L', 'c', and 'q' specify the stand-alone form of the text styles.
* <p>
* <b>Number</b>: If the count of letters is one, then the value is output using
* the minimum number of digits and without padding. Otherwise, the count of digits
* is used as the width of the output field, with the value zero-padded as necessary.
* The following pattern letters have constraints on the count of letters.
* Only one letter of 'c' and 'F' can be specified.
* Up to two letters of 'd', 'H', 'h', 'K', 'k', 'm', and 's' can be specified.
* Up to three letters of 'D' can be specified.
* <p>
* <b>Number/Text</b>: If the count of pattern letters is 3 or greater, use the
* Text rules above. Otherwise use the Number rules above.
* <p>
* <b>Fraction</b>: Outputs the nano-of-second field as a fraction-of-second.
* The nano-of-second value has nine digits, thus the count of pattern letters
* is from 1 to 9. If it is less than 9, then the nano-of-second value is
* truncated, with only the most significant digits being output.
* <p>
* <b>Year</b>: The count of letters determines the minimum field width below
* which padding is used. If the count of letters is two, then a
* {@link DateTimeFormatterBuilder#appendValueReduced reduced} two digit form is
* used. For printing, this outputs the rightmost two digits. For parsing, this
* will parse using the base value of 2000, resulting in a year within the range
* 2000 to 2099 inclusive. If the count of letters is less than four (but not
* two), then the sign is only output for negative years as per
* {@link SignStyle#NORMAL}. Otherwise, the sign is output if the pad width is
* exceeded, as per {@link SignStyle#EXCEEDS_PAD}.
* <p>
* <b>ZoneId</b>: This outputs the time-zone ID, such as 'Europe/Paris'. If the
* count of letters is two, then the time-zone ID is output. Any other count of
* letters throws {@code IllegalArgumentException}.
* <p>
* <b>Zone names</b>: This outputs the display name of the time-zone ID. If the
* count of letters is one, two or three, then the short name is output. If the
* count of letters is four, then the full name is output. Five or more letters
* throws {@code IllegalArgumentException}.
* <p>
* <b>Offset X and x</b>: This formats the offset based on the number of pattern
* letters. One letter outputs just the hour, such as '+01', unless the minute
* is non-zero in which case the minute is also output, such as '+0130'. Two
* letters outputs the hour and minute, without a colon, such as '+0130'. Three
* letters outputs the hour and minute, with a colon, such as '+01:30'. Four
* letters outputs the hour and minute and optional second, without a colon,
* such as '+013015'. Five letters outputs the hour and minute and optional
* second, with a colon, such as '+01:30:15'. Six or more letters throws
* {@code IllegalArgumentException}. Pattern letter 'X' (upper case) will output
* 'Z' when the offset to be output would be zero, whereas pattern letter 'x'
* (lower case) will output '+00', '+0000', or '+00:00'.
* <p>
* <b>Offset O</b>: This formats the localized offset based on the number of
* pattern letters. One letter outputs the {@linkplain TextStyle#SHORT short}
* form of the localized offset, which is localized offset text, such as 'GMT',
* with hour without leading zero, optional 2-digit minute and second if
* non-zero, and colon, for example 'GMT+8'. Four letters outputs the
* {@linkplain TextStyle#FULL full} form, which is localized offset text,
* such as 'GMT, with 2-digit hour and minute field, optional second field
* if non-zero, and colon, for example 'GMT+08:00'. Any other count of letters
* throws {@code IllegalArgumentException}.
* <p>
* <b>Offset Z</b>: This formats the offset based on the number of pattern
* letters. One, two or three letters outputs the hour and minute, without a
* colon, such as '+0130'. The output will be '+0000' when the offset is zero.
* Four letters outputs the {@linkplain TextStyle#FULL full} form of localized
* offset, equivalent to four letters of Offset-O. The output will be the
* corresponding localized offset text if the offset is zero. Five
* letters outputs the hour, minute, with optional second if non-zero, with
* colon. It outputs 'Z' if the offset is zero.
* Six or more letters throws {@code IllegalArgumentException}.
* <p>
* <b>Optional section</b>: The optional section markers work exactly like
* calling {@link DateTimeFormatterBuilder#optionalStart()} and
* {@link DateTimeFormatterBuilder#optionalEnd()}.
* <p>
* <b>Pad modifier</b>: Modifies the pattern that immediately follows to be
* padded with spaces. The pad width is determined by the number of pattern
* letters. This is the same as calling
* {@link DateTimeFormatterBuilder#padNext(int)}.
* <p>
* For example, 'ppH' outputs the hour-of-day padded on the left with spaces to
* a width of 2.
* <p>
* Any unrecognized letter is an error. Any non-letter character, other than
* '[', ']', '{', '}', '#' and the single quote will be output directly.
* Despite this, it is recommended to use single quotes around all characters
* that you want to output directly to ensure that future changes do not break
* your application.
*
* <h3 id="resolving">Resolving</h3>
* Parsing is implemented as a two-phase operation.
* First, the text is parsed using the layout defined by the formatter, producing
* a {@code Map} of field to value, a {@code ZoneId} and a {@code Chronology}.
* Second, the parsed data is <em>resolved</em>, by validating, combining and
* simplifying the various fields into more useful ones.
* <p>
* Five parsing methods are supplied by this class.
* Four of these perform both the parse and resolve phases.
* The fifth method, {@link #parseUnresolved(CharSequence, ParsePosition)},
* only performs the first phase, leaving the result unresolved.
* As such, it is essentially a low-level operation.
* <p>
* The resolve phase is controlled by two parameters, set on this class.
* <p>
* The {@link ResolverStyle} is an enum that offers three different approaches,
* strict, smart and lenient. The smart option is the default.
* It can be set using {@link #withResolverStyle(ResolverStyle)}.
* <p>
* The {@link #withResolverFields(TemporalField...)} parameter allows the
* set of fields that will be resolved to be filtered before resolving starts.
* For example, if the formatter has parsed a year, month, day-of-month
* and day-of-year, then there are two approaches to resolve a date:
* (year + month + day-of-month) and (year + day-of-year).
* The resolver fields allows one of the two approaches to be selected.
* If no resolver fields are set then both approaches must result in the same date.
* <p>
* Resolving separate fields to form a complete date and time is a complex
* process with behaviour distributed across a number of classes.
* It follows these steps:
* <ol>
* <li>The chronology is determined.
* The chronology of the result is either the chronology that was parsed,
* or if no chronology was parsed, it is the chronology set on this class,
* or if that is null, it is {@code IsoChronology}.
* <li>The {@code ChronoField} date fields are resolved.
* This is achieved using {@link Chronology#resolveDate(Map, ResolverStyle)}.
* Documentation about field resolution is located in the implementation
* of {@code Chronology}.
* <li>The {@code ChronoField} time fields are resolved.
* This is documented on {@link ChronoField} and is the same for all chronologies.
* <li>Any fields that are not {@code ChronoField} are processed.
* This is achieved using {@link TemporalField#resolve(Map, TemporalAccessor, ResolverStyle)}.
* Documentation about field resolution is located in the implementation
* of {@code TemporalField}.
* <li>The {@code ChronoField} date and time fields are re-resolved.
* This allows fields in step four to produce {@code ChronoField} values
* and have them be processed into dates and times.
* <li>A {@code LocalTime} is formed if there is at least an hour-of-day available.
* This involves providing default values for minute, second and fraction of second.
* <li>Any remaining unresolved fields are cross-checked against any
* date and/or time that was resolved. Thus, an earlier stage would resolve
* (year + month + day-of-month) to a date, and this stage would check that
* day-of-week was valid for the date.
* <li>If an {@linkplain #parsedExcessDays() excess number of days}
* was parsed then it is added to the date if a date is available.
* </ol>
*
* @implSpec
* This class is immutable and thread-safe.
*
* @since 1.8
*/
public final class DateTimeFormatter {
/**
* The printer and/or parser to use, not null.
*/
private final CompositePrinterParser printerParser;
/**
* The locale to use for formatting, not null.
*/
private final Locale locale;
/**
* The symbols to use for formatting, not null.
*/
private final DecimalStyle decimalStyle;
/**
* The resolver style to use, not null.
*/
private final ResolverStyle resolverStyle;
/**
* The fields to use in resolving, null for all fields.
*/
private final Set<TemporalField> resolverFields;
/**
* The chronology to use for formatting, null for no override.
*/
private final Chronology chrono;
/**
* The zone to use for formatting, null for no override.
*/
private final ZoneId zone;
//-----------------------------------------------------------------------
/**
* Creates a formatter using the specified pattern.
* <p>
* This method will create a formatter based on a simple
* <a href="#patterns">pattern of letters and symbols</a>
* as described in the class documentation.
* For example, {@code d MMM uuuu} will format 2011-12-03 as '3 Dec 2011'.
* <p>
* The formatter will use the {@link Locale#getDefault(Locale.Category) default FORMAT locale}.
* This can be changed using {@link DateTimeFormatter#withLocale(Locale)} on the returned formatter
* Alternatively use the {@link #ofPattern(String, Locale)} variant of this method.
* <p>
* The returned formatter has no override chronology or zone.
* It uses {@link ResolverStyle#SMART SMART} resolver style.
*
* @param pattern the pattern to use, not null
* @return the formatter based on the pattern, not null
* @throws IllegalArgumentException if the pattern is invalid
* @see DateTimeFormatterBuilder#appendPattern(String)
*/
public static DateTimeFormatter ofPattern(String pattern) {
return new DateTimeFormatterBuilder().appendPattern(pattern).toFormatter();
}
/**
* Creates a formatter using the specified pattern and locale.
* <p>
* This method will create a formatter based on a simple
* <a href="#patterns">pattern of letters and symbols</a>
* as described in the class documentation.
* For example, {@code d MMM uuuu} will format 2011-12-03 as '3 Dec 2011'.
* <p>
* The formatter will use the specified locale.
* This can be changed using {@link DateTimeFormatter#withLocale(Locale)} on the returned formatter
* <p>
* The returned formatter has no override chronology or zone.
* It uses {@link ResolverStyle#SMART SMART} resolver style.
*
* @param pattern the pattern to use, not null
* @param locale the locale to use, not null
* @return the formatter based on the pattern, not null
* @throws IllegalArgumentException if the pattern is invalid
* @see DateTimeFormatterBuilder#appendPattern(String)
*/
public static DateTimeFormatter ofPattern(String pattern, Locale locale) {
return new DateTimeFormatterBuilder().appendPattern(pattern).toFormatter(locale);
}
//-----------------------------------------------------------------------
/**
* Returns a locale specific date format for the ISO chronology.
* <p>
* This returns a formatter that will format or parse a date.
* The exact format pattern used varies by locale.
* <p>
* The locale is determined from the formatter. The formatter returned directly by
* this method will use the {@link Locale#getDefault(Locale.Category) default FORMAT locale}.
* The locale can be controlled using {@link DateTimeFormatter#withLocale(Locale) withLocale(Locale)}
* on the result of this method.
* <p>
* Note that the localized pattern is looked up lazily.
* This {@code DateTimeFormatter} holds the style required and the locale,
* looking up the pattern required on demand.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#SMART SMART} resolver style.
*
* @param dateStyle the formatter style to obtain, not null
* @return the date formatter, not null
*/
public static DateTimeFormatter ofLocalizedDate(FormatStyle dateStyle) {
Objects.requireNonNull(dateStyle, "dateStyle");
return new DateTimeFormatterBuilder().appendLocalized(dateStyle, null)
.toFormatter(ResolverStyle.SMART, IsoChronology.INSTANCE);
}
/**
* Returns a locale specific time format for the ISO chronology.
* <p>
* This returns a formatter that will format or parse a time.
* The exact format pattern used varies by locale.
* <p>
* The locale is determined from the formatter. The formatter returned directly by
* this method will use the {@link Locale#getDefault(Locale.Category) default FORMAT locale}.
* The locale can be controlled using {@link DateTimeFormatter#withLocale(Locale) withLocale(Locale)}
* on the result of this method.
* <p>
* Note that the localized pattern is looked up lazily.
* This {@code DateTimeFormatter} holds the style required and the locale,
* looking up the pattern required on demand.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#SMART SMART} resolver style.
*
* @param timeStyle the formatter style to obtain, not null
* @return the time formatter, not null
*/
public static DateTimeFormatter ofLocalizedTime(FormatStyle timeStyle) {
Objects.requireNonNull(timeStyle, "timeStyle");
return new DateTimeFormatterBuilder().appendLocalized(null, timeStyle)
.toFormatter(ResolverStyle.SMART, IsoChronology.INSTANCE);
}
/**
* Returns a locale specific date-time formatter for the ISO chronology.
* <p>
* This returns a formatter that will format or parse a date-time.
* The exact format pattern used varies by locale.
* <p>
* The locale is determined from the formatter. The formatter returned directly by
* this method will use the {@link Locale#getDefault(Locale.Category) default FORMAT locale}.
* The locale can be controlled using {@link DateTimeFormatter#withLocale(Locale) withLocale(Locale)}
* on the result of this method.
* <p>
* Note that the localized pattern is looked up lazily.
* This {@code DateTimeFormatter} holds the style required and the locale,
* looking up the pattern required on demand.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#SMART SMART} resolver style.
*
* @param dateTimeStyle the formatter style to obtain, not null
* @return the date-time formatter, not null
*/
public static DateTimeFormatter ofLocalizedDateTime(FormatStyle dateTimeStyle) {
Objects.requireNonNull(dateTimeStyle, "dateTimeStyle");
return new DateTimeFormatterBuilder().appendLocalized(dateTimeStyle, dateTimeStyle)
.toFormatter(ResolverStyle.SMART, IsoChronology.INSTANCE);
}
/**
* Returns a locale specific date and time format for the ISO chronology.
* <p>
* This returns a formatter that will format or parse a date-time.
* The exact format pattern used varies by locale.
* <p>
* The locale is determined from the formatter. The formatter returned directly by
* this method will use the {@link Locale#getDefault() default FORMAT locale}.
* The locale can be controlled using {@link DateTimeFormatter#withLocale(Locale) withLocale(Locale)}
* on the result of this method.
* <p>
* Note that the localized pattern is looked up lazily.
* This {@code DateTimeFormatter} holds the style required and the locale,
* looking up the pattern required on demand.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#SMART SMART} resolver style.
*
* @param dateStyle the date formatter style to obtain, not null
* @param timeStyle the time formatter style to obtain, not null
* @return the date, time or date-time formatter, not null
*/
public static DateTimeFormatter ofLocalizedDateTime(FormatStyle dateStyle, FormatStyle timeStyle) {
Objects.requireNonNull(dateStyle, "dateStyle");
Objects.requireNonNull(timeStyle, "timeStyle");
return new DateTimeFormatterBuilder().appendLocalized(dateStyle, timeStyle)
.toFormatter(ResolverStyle.SMART, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO date formatter that formats or parses a date without an
* offset, such as '2011-12-03'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended local date format.
* The format consists of:
* <ul>
* <li>Four digits or more for the {@link ChronoField#YEAR year}.
* Years in the range 0000 to 9999 will be pre-padded by zero to ensure four digits.
* Years outside that range will have a prefixed positive or negative symbol.
* <li>A dash
* <li>Two digits for the {@link ChronoField#MONTH_OF_YEAR month-of-year}.
* This is pre-padded by zero to ensure two digits.
* <li>A dash
* <li>Two digits for the {@link ChronoField#DAY_OF_MONTH day-of-month}.
* This is pre-padded by zero to ensure two digits.
* </ul>
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_LOCAL_DATE;
static {
ISO_LOCAL_DATE = new DateTimeFormatterBuilder()
.appendValue(YEAR, 4, 10, SignStyle.EXCEEDS_PAD)
.appendLiteral('-')
.appendValue(MONTH_OF_YEAR, 2)
.appendLiteral('-')
.appendValue(DAY_OF_MONTH, 2)
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO date formatter that formats or parses a date with an
* offset, such as '2011-12-03+01:00'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended offset date format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_DATE}
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_OFFSET_DATE;
static {
ISO_OFFSET_DATE = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_DATE)
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO date formatter that formats or parses a date with the
* offset if available, such as '2011-12-03' or '2011-12-03+01:00'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended date format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_DATE}
* <li>If the offset is not available then the format is complete.
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* As this formatter has an optional element, it may be necessary to parse using
* {@link DateTimeFormatter#parseBest}.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_DATE;
static {
ISO_DATE = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_DATE)
.optionalStart()
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO time formatter that formats or parses a time without an
* offset, such as '10:15' or '10:15:30'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended local time format.
* The format consists of:
* <ul>
* <li>Two digits for the {@link ChronoField#HOUR_OF_DAY hour-of-day}.
* This is pre-padded by zero to ensure two digits.
* <li>A colon
* <li>Two digits for the {@link ChronoField#MINUTE_OF_HOUR minute-of-hour}.
* This is pre-padded by zero to ensure two digits.
* <li>If the second-of-minute is not available then the format is complete.
* <li>A colon
* <li>Two digits for the {@link ChronoField#SECOND_OF_MINUTE second-of-minute}.
* This is pre-padded by zero to ensure two digits.
* <li>If the nano-of-second is zero or not available then the format is complete.
* <li>A decimal point
* <li>One to nine digits for the {@link ChronoField#NANO_OF_SECOND nano-of-second}.
* As many digits will be output as required.
* </ul>
* <p>
* The returned formatter has no override chronology or zone.
* It uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_LOCAL_TIME;
static {
ISO_LOCAL_TIME = new DateTimeFormatterBuilder()
.appendValue(HOUR_OF_DAY, 2)
.appendLiteral(':')
.appendValue(MINUTE_OF_HOUR, 2)
.optionalStart()
.appendLiteral(':')
.appendValue(SECOND_OF_MINUTE, 2)
.optionalStart()
.appendFraction(NANO_OF_SECOND, 0, 9, true)
.toFormatter(ResolverStyle.STRICT, null);
}
//-----------------------------------------------------------------------
/**
* The ISO time formatter that formats or parses a time with an
* offset, such as '10:15+01:00' or '10:15:30+01:00'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended offset time format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_TIME}
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* The returned formatter has no override chronology or zone.
* It uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_OFFSET_TIME;
static {
ISO_OFFSET_TIME = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_TIME)
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, null);
}
//-----------------------------------------------------------------------
/**
* The ISO time formatter that formats or parses a time, with the
* offset if available, such as '10:15', '10:15:30' or '10:15:30+01:00'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended offset time format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_TIME}
* <li>If the offset is not available then the format is complete.
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* As this formatter has an optional element, it may be necessary to parse using
* {@link DateTimeFormatter#parseBest}.
* <p>
* The returned formatter has no override chronology or zone.
* It uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_TIME;
static {
ISO_TIME = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_TIME)
.optionalStart()
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, null);
}
//-----------------------------------------------------------------------
/**
* The ISO date-time formatter that formats or parses a date-time without
* an offset, such as '2011-12-03T10:15:30'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended offset date-time format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_DATE}
* <li>The letter 'T'. Parsing is case insensitive.
* <li>The {@link #ISO_LOCAL_TIME}
* </ul>
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_LOCAL_DATE_TIME;
static {
ISO_LOCAL_DATE_TIME = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_DATE)
.appendLiteral('T')
.append(ISO_LOCAL_TIME)
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO date-time formatter that formats or parses a date-time with an
* offset, such as '2011-12-03T10:15:30+01:00'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended offset date-time format.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_DATE_TIME}
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_OFFSET_DATE_TIME;
static {
ISO_OFFSET_DATE_TIME = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.append(ISO_LOCAL_DATE_TIME)
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO-like date-time formatter that formats or parses a date-time with
* offset and zone, such as '2011-12-03T10:15:30+01:00[Europe/Paris]'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* a format that extends the ISO-8601 extended offset date-time format
* to add the time-zone.
* The section in square brackets is not part of the ISO-8601 standard.
* The format consists of:
* <ul>
* <li>The {@link #ISO_OFFSET_DATE_TIME}
* <li>If the zone ID is not available or is a {@code ZoneOffset} then the format is complete.
* <li>An open square bracket '['.
* <li>The {@link ZoneId#getId() zone ID}. This is not part of the ISO-8601 standard.
* Parsing is case sensitive.
* <li>A close square bracket ']'.
* </ul>
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_ZONED_DATE_TIME;
static {
ISO_ZONED_DATE_TIME = new DateTimeFormatterBuilder()
.append(ISO_OFFSET_DATE_TIME)
.optionalStart()
.appendLiteral('[')
.parseCaseSensitive()
.appendZoneRegionId()
.appendLiteral(']')
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO-like date-time formatter that formats or parses a date-time with
* the offset and zone if available, such as '2011-12-03T10:15:30',
* '2011-12-03T10:15:30+01:00' or '2011-12-03T10:15:30+01:00[Europe/Paris]'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended local or offset date-time format, as well as the
* extended non-ISO form specifying the time-zone.
* The format consists of:
* <ul>
* <li>The {@link #ISO_LOCAL_DATE_TIME}
* <li>If the offset is not available to format or parse then the format is complete.
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* <li>If the zone ID is not available or is a {@code ZoneOffset} then the format is complete.
* <li>An open square bracket '['.
* <li>The {@link ZoneId#getId() zone ID}. This is not part of the ISO-8601 standard.
* Parsing is case sensitive.
* <li>A close square bracket ']'.
* </ul>
* <p>
* As this formatter has an optional element, it may be necessary to parse using
* {@link DateTimeFormatter#parseBest}.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_DATE_TIME;
static {
ISO_DATE_TIME = new DateTimeFormatterBuilder()
.append(ISO_LOCAL_DATE_TIME)
.optionalStart()
.appendOffsetId()
.optionalStart()
.appendLiteral('[')
.parseCaseSensitive()
.appendZoneRegionId()
.appendLiteral(']')
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO date formatter that formats or parses the ordinal date
* without an offset, such as '2012-337'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended ordinal date format.
* The format consists of:
* <ul>
* <li>Four digits or more for the {@link ChronoField#YEAR year}.
* Years in the range 0000 to 9999 will be pre-padded by zero to ensure four digits.
* Years outside that range will have a prefixed positive or negative symbol.
* <li>A dash
* <li>Three digits for the {@link ChronoField#DAY_OF_YEAR day-of-year}.
* This is pre-padded by zero to ensure three digits.
* <li>If the offset is not available to format or parse then the format is complete.
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* As this formatter has an optional element, it may be necessary to parse using
* {@link DateTimeFormatter#parseBest}.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_ORDINAL_DATE;
static {
ISO_ORDINAL_DATE = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.appendValue(YEAR, 4, 10, SignStyle.EXCEEDS_PAD)
.appendLiteral('-')
.appendValue(DAY_OF_YEAR, 3)
.optionalStart()
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO date formatter that formats or parses the week-based date
* without an offset, such as '2012-W48-6'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 extended week-based date format.
* The format consists of:
* <ul>
* <li>Four digits or more for the {@link IsoFields#WEEK_BASED_YEAR week-based-year}.
* Years in the range 0000 to 9999 will be pre-padded by zero to ensure four digits.
* Years outside that range will have a prefixed positive or negative symbol.
* <li>A dash
* <li>The letter 'W'. Parsing is case insensitive.
* <li>Two digits for the {@link IsoFields#WEEK_OF_WEEK_BASED_YEAR week-of-week-based-year}.
* This is pre-padded by zero to ensure three digits.
* <li>A dash
* <li>One digit for the {@link ChronoField#DAY_OF_WEEK day-of-week}.
* The value run from Monday (1) to Sunday (7).
* <li>If the offset is not available to format or parse then the format is complete.
* <li>The {@link ZoneOffset#getId() offset ID}. If the offset has seconds then
* they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* As this formatter has an optional element, it may be necessary to parse using
* {@link DateTimeFormatter#parseBest}.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_WEEK_DATE;
static {
ISO_WEEK_DATE = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.appendValue(IsoFields.WEEK_BASED_YEAR, 4, 10, SignStyle.EXCEEDS_PAD)
.appendLiteral("-W")
.appendValue(IsoFields.WEEK_OF_WEEK_BASED_YEAR, 2)
.appendLiteral('-')
.appendValue(DAY_OF_WEEK, 1)
.optionalStart()
.appendOffsetId()
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The ISO instant formatter that formats or parses an instant in UTC,
* such as '2011-12-03T10:15:30Z'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 instant format.
* When formatting, the second-of-minute is always output.
* The nano-of-second outputs zero, three, six or nine digits digits as necessary.
* When parsing, time to at least the seconds field is required.
* Fractional seconds from zero to nine are parsed.
* The localized decimal style is not used.
* <p>
* This is a special case formatter intended to allow a human readable form
* of an {@link java.time.Instant}. The {@code Instant} class is designed to
* only represent a point in time and internally stores a value in nanoseconds
* from a fixed epoch of 1970-01-01Z. As such, an {@code Instant} cannot be
* formatted as a date or time without providing some form of time-zone.
* This formatter allows the {@code Instant} to be formatted, by providing
* a suitable conversion using {@code ZoneOffset.UTC}.
* <p>
* The format consists of:
* <ul>
* <li>The {@link #ISO_OFFSET_DATE_TIME} where the instant is converted from
* {@link ChronoField#INSTANT_SECONDS} and {@link ChronoField#NANO_OF_SECOND}
* using the {@code UTC} offset. Parsing is case insensitive.
* </ul>
* <p>
* The returned formatter has no override chronology or zone.
* It uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter ISO_INSTANT;
static {
ISO_INSTANT = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.appendInstant()
.toFormatter(ResolverStyle.STRICT, null);
}
//-----------------------------------------------------------------------
/**
* The ISO date formatter that formats or parses a date without an
* offset, such as '20111203'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* the ISO-8601 basic local date format.
* The format consists of:
* <ul>
* <li>Four digits for the {@link ChronoField#YEAR year}.
* Only years in the range 0000 to 9999 are supported.
* <li>Two digits for the {@link ChronoField#MONTH_OF_YEAR month-of-year}.
* This is pre-padded by zero to ensure two digits.
* <li>Two digits for the {@link ChronoField#DAY_OF_MONTH day-of-month}.
* This is pre-padded by zero to ensure two digits.
* <li>If the offset is not available to format or parse then the format is complete.
* <li>The {@link ZoneOffset#getId() offset ID} without colons. If the offset has
* seconds then they will be handled even though this is not part of the ISO-8601 standard.
* Parsing is case insensitive.
* </ul>
* <p>
* As this formatter has an optional element, it may be necessary to parse using
* {@link DateTimeFormatter#parseBest}.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#STRICT STRICT} resolver style.
*/
public static final DateTimeFormatter BASIC_ISO_DATE;
static {
BASIC_ISO_DATE = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.appendValue(YEAR, 4)
.appendValue(MONTH_OF_YEAR, 2)
.appendValue(DAY_OF_MONTH, 2)
.optionalStart()
.appendOffset("+HHMMss", "Z")
.toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* The RFC-1123 date-time formatter, such as 'Tue, 3 Jun 2008 11:05:30 GMT'.
* <p>
* This returns an immutable formatter capable of formatting and parsing
* most of the RFC-1123 format.
* RFC-1123 updates RFC-822 changing the year from two digits to four.
* This implementation requires a four digit year.
* This implementation also does not handle North American or military zone
* names, only 'GMT' and offset amounts.
* <p>
* The format consists of:
* <ul>
* <li>If the day-of-week is not available to format or parse then jump to day-of-month.
* <li>Three letter {@link ChronoField#DAY_OF_WEEK day-of-week} in English.
* <li>A comma
* <li>A space
* <li>One or two digits for the {@link ChronoField#DAY_OF_MONTH day-of-month}.
* <li>A space
* <li>Three letter {@link ChronoField#MONTH_OF_YEAR month-of-year} in English.
* <li>A space
* <li>Four digits for the {@link ChronoField#YEAR year}.
* Only years in the range 0000 to 9999 are supported.
* <li>A space
* <li>Two digits for the {@link ChronoField#HOUR_OF_DAY hour-of-day}.
* This is pre-padded by zero to ensure two digits.
* <li>A colon
* <li>Two digits for the {@link ChronoField#MINUTE_OF_HOUR minute-of-hour}.
* This is pre-padded by zero to ensure two digits.
* <li>If the second-of-minute is not available then jump to the next space.
* <li>A colon
* <li>Two digits for the {@link ChronoField#SECOND_OF_MINUTE second-of-minute}.
* This is pre-padded by zero to ensure two digits.
* <li>A space
* <li>The {@link ZoneOffset#getId() offset ID} without colons or seconds.
* An offset of zero uses "GMT". North American zone names and military zone names are not handled.
* </ul>
* <p>
* Parsing is case insensitive.
* <p>
* The returned formatter has a chronology of ISO set to ensure dates in
* other calendar systems are correctly converted.
* It has no override zone and uses the {@link ResolverStyle#SMART SMART} resolver style.
*/
public static final DateTimeFormatter RFC_1123_DATE_TIME;
static {
// manually code maps to ensure correct data always used
// (locale data can be changed by application code)
Map<Long, String> dow = new HashMap<>();
dow.put(1L, "Mon");
dow.put(2L, "Tue");
dow.put(3L, "Wed");
dow.put(4L, "Thu");
dow.put(5L, "Fri");
dow.put(6L, "Sat");
dow.put(7L, "Sun");
Map<Long, String> moy = new HashMap<>();
moy.put(1L, "Jan");
moy.put(2L, "Feb");
moy.put(3L, "Mar");
moy.put(4L, "Apr");
moy.put(5L, "May");
moy.put(6L, "Jun");
moy.put(7L, "Jul");
moy.put(8L, "Aug");
moy.put(9L, "Sep");
moy.put(10L, "Oct");
moy.put(11L, "Nov");
moy.put(12L, "Dec");
RFC_1123_DATE_TIME = new DateTimeFormatterBuilder()
.parseCaseInsensitive()
.parseLenient()
.optionalStart()
.appendText(DAY_OF_WEEK, dow)
.appendLiteral(", ")
.optionalEnd()
.appendValue(DAY_OF_MONTH, 1, 2, SignStyle.NOT_NEGATIVE)
.appendLiteral(' ')
.appendText(MONTH_OF_YEAR, moy)
.appendLiteral(' ')
.appendValue(YEAR, 4) // 2 digit year not handled
.appendLiteral(' ')
.appendValue(HOUR_OF_DAY, 2)
.appendLiteral(':')
.appendValue(MINUTE_OF_HOUR, 2)
.optionalStart()
.appendLiteral(':')
.appendValue(SECOND_OF_MINUTE, 2)
.optionalEnd()
.appendLiteral(' ')
.appendOffset("+HHMM", "GMT") // should handle UT/Z/EST/EDT/CST/CDT/MST/MDT/PST/MDT
.toFormatter(ResolverStyle.SMART, IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* A query that provides access to the excess days that were parsed.
* <p>
* This returns a singleton {@linkplain TemporalQuery query} that provides
* access to additional information from the parse. The query always returns
* a non-null period, with a zero period returned instead of null.
* <p>
* There are two situations where this query may return a non-zero period.
* <ul>
* <li>If the {@code ResolverStyle} is {@code LENIENT} and a time is parsed
* without a date, then the complete result of the parse consists of a
* {@code LocalTime} and an excess {@code Period} in days.
*
* <li>If the {@code ResolverStyle} is {@code SMART} and a time is parsed
* without a date where the time is 24:00:00, then the complete result of
* the parse consists of a {@code LocalTime} of 00:00:00 and an excess
* {@code Period} of one day.
* </ul>
* <p>
* In both cases, if a complete {@code ChronoLocalDateTime} or {@code Instant}
* is parsed, then the excess days are added to the date part.
* As a result, this query will return a zero period.
* <p>
* The {@code SMART} behaviour handles the common "end of day" 24:00 value.
* Processing in {@code LENIENT} mode also produces the same result:
* <pre>
* Text to parse Parsed object Excess days
* "2012-12-03T00:00" LocalDateTime.of(2012, 12, 3, 0, 0) ZERO
* "2012-12-03T24:00" LocalDateTime.of(2012, 12, 4, 0, 0) ZERO
* "00:00" LocalTime.of(0, 0) ZERO
* "24:00" LocalTime.of(0, 0) Period.ofDays(1)
* </pre>
* The query can be used as follows:
* <pre>
* TemporalAccessor parsed = formatter.parse(str);
* LocalTime time = parsed.query(LocalTime::from);
* Period extraDays = parsed.query(DateTimeFormatter.parsedExcessDays());
* </pre>
* @return a query that provides access to the excess days that were parsed
*/
public static final TemporalQuery<Period> parsedExcessDays() {
return PARSED_EXCESS_DAYS;
}
private static final TemporalQuery<Period> PARSED_EXCESS_DAYS = t -> {
if (t instanceof Parsed) {
return ((Parsed) t).excessDays;
} else {
return Period.ZERO;
}
};
/**
* A query that provides access to whether a leap-second was parsed.
* <p>
* This returns a singleton {@linkplain TemporalQuery query} that provides
* access to additional information from the parse. The query always returns
* a non-null boolean, true if parsing saw a leap-second, false if not.
* <p>
* Instant parsing handles the special "leap second" time of '23:59:60'.
* Leap seconds occur at '23:59:60' in the UTC time-zone, but at other
* local times in different time-zones. To avoid this potential ambiguity,
* the handling of leap-seconds is limited to
* {@link DateTimeFormatterBuilder#appendInstant()}, as that method
* always parses the instant with the UTC zone offset.
* <p>
* If the time '23:59:60' is received, then a simple conversion is applied,
* replacing the second-of-minute of 60 with 59. This query can be used
* on the parse result to determine if the leap-second adjustment was made.
* The query will return {@code true} if it did adjust to remove the
* leap-second, and {@code false} if not. Note that applying a leap-second
* smoothing mechanism, such as UTC-SLS, is the responsibility of the
* application, as follows:
* <pre>
* TemporalAccessor parsed = formatter.parse(str);
* Instant instant = parsed.query(Instant::from);
* if (parsed.query(DateTimeFormatter.parsedLeapSecond())) {
* // validate leap-second is correct and apply correct smoothing
* }
* </pre>
* @return a query that provides access to whether a leap-second was parsed
*/
public static final TemporalQuery<Boolean> parsedLeapSecond() {
return PARSED_LEAP_SECOND;
}
private static final TemporalQuery<Boolean> PARSED_LEAP_SECOND = t -> {
if (t instanceof Parsed) {
return ((Parsed) t).leapSecond;
} else {
return Boolean.FALSE;
}
};
//-----------------------------------------------------------------------
/**
* Constructor.
*
* @param printerParser the printer/parser to use, not null
* @param locale the locale to use, not null
* @param decimalStyle the DecimalStyle to use, not null
* @param resolverStyle the resolver style to use, not null
* @param resolverFields the fields to use during resolving, null for all fields
* @param chrono the chronology to use, null for no override
* @param zone the zone to use, null for no override
*/
DateTimeFormatter(CompositePrinterParser printerParser,
Locale locale, DecimalStyle decimalStyle,
ResolverStyle resolverStyle, Set<TemporalField> resolverFields,
Chronology chrono, ZoneId zone) {
this.printerParser = Objects.requireNonNull(printerParser, "printerParser");
this.resolverFields = resolverFields;
this.locale = Objects.requireNonNull(locale, "locale");
this.decimalStyle = Objects.requireNonNull(decimalStyle, "decimalStyle");
this.resolverStyle = Objects.requireNonNull(resolverStyle, "resolverStyle");
this.chrono = chrono;
this.zone = zone;
}
//-----------------------------------------------------------------------
/**
* Gets the locale to be used during formatting.
* <p>
* This is used to lookup any part of the formatter needing specific
* localization, such as the text or localized pattern.
*
* @return the locale of this formatter, not null
*/
public Locale getLocale() {
return locale;
}
/**
* Returns a copy of this formatter with a new locale.
* <p>
* This is used to lookup any part of the formatter needing specific
* localization, such as the text or localized pattern.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param locale the new locale, not null
* @return a formatter based on this formatter with the requested locale, not null
*/
public DateTimeFormatter withLocale(Locale locale) {
if (this.locale.equals(locale)) {
return this;
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, resolverFields, chrono, zone);
}
//-----------------------------------------------------------------------
/**
* Gets the DecimalStyle to be used during formatting.
*
* @return the locale of this formatter, not null
*/
public DecimalStyle getDecimalStyle() {
return decimalStyle;
}
/**
* Returns a copy of this formatter with a new DecimalStyle.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param decimalStyle the new DecimalStyle, not null
* @return a formatter based on this formatter with the requested DecimalStyle, not null
*/
public DateTimeFormatter withDecimalStyle(DecimalStyle decimalStyle) {
if (this.decimalStyle.equals(decimalStyle)) {
return this;
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, resolverFields, chrono, zone);
}
//-----------------------------------------------------------------------
/**
* Gets the overriding chronology to be used during formatting.
* <p>
* This returns the override chronology, used to convert dates.
* By default, a formatter has no override chronology, returning null.
* See {@link #withChronology(Chronology)} for more details on overriding.
*
* @return the override chronology of this formatter, null if no override
*/
public Chronology getChronology() {
return chrono;
}
/**
* Returns a copy of this formatter with a new override chronology.
* <p>
* This returns a formatter with similar state to this formatter but
* with the override chronology set.
* By default, a formatter has no override chronology, returning null.
* <p>
* If an override is added, then any date that is formatted or parsed will be affected.
* <p>
* When formatting, if the temporal object contains a date, then it will
* be converted to a date in the override chronology.
* Whether the temporal contains a date is determined by querying the
* {@link ChronoField#EPOCH_DAY EPOCH_DAY} field.
* Any time or zone will be retained unaltered unless overridden.
* <p>
* If the temporal object does not contain a date, but does contain one
* or more {@code ChronoField} date fields, then a {@code DateTimeException}
* is thrown. In all other cases, the override chronology is added to the temporal,
* replacing any previous chronology, but without changing the date/time.
* <p>
* When parsing, there are two distinct cases to consider.
* If a chronology has been parsed directly from the text, perhaps because
* {@link DateTimeFormatterBuilder#appendChronologyId()} was used, then
* this override chronology has no effect.
* If no zone has been parsed, then this override chronology will be used
* to interpret the {@code ChronoField} values into a date according to the
* date resolving rules of the chronology.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param chrono the new chronology, null if no override
* @return a formatter based on this formatter with the requested override chronology, not null
*/
public DateTimeFormatter withChronology(Chronology chrono) {
if (Objects.equals(this.chrono, chrono)) {
return this;
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, resolverFields, chrono, zone);
}
//-----------------------------------------------------------------------
/**
* Gets the overriding zone to be used during formatting.
* <p>
* This returns the override zone, used to convert instants.
* By default, a formatter has no override zone, returning null.
* See {@link #withZone(ZoneId)} for more details on overriding.
*
* @return the override zone of this formatter, null if no override
*/
public ZoneId getZone() {
return zone;
}
/**
* Returns a copy of this formatter with a new override zone.
* <p>
* This returns a formatter with similar state to this formatter but
* with the override zone set.
* By default, a formatter has no override zone, returning null.
* <p>
* If an override is added, then any instant that is formatted or parsed will be affected.
* <p>
* When formatting, if the temporal object contains an instant, then it will
* be converted to a zoned date-time using the override zone.
* Whether the temporal is an instant is determined by querying the
* {@link ChronoField#INSTANT_SECONDS INSTANT_SECONDS} field.
* If the input has a chronology then it will be retained unless overridden.
* If the input does not have a chronology, such as {@code Instant}, then
* the ISO chronology will be used.
* <p>
* If the temporal object does not contain an instant, but does contain
* an offset then an additional check is made. If the normalized override
* zone is an offset that differs from the offset of the temporal, then
* a {@code DateTimeException} is thrown. In all other cases, the override
* zone is added to the temporal, replacing any previous zone, but without
* changing the date/time.
* <p>
* When parsing, there are two distinct cases to consider.
* If a zone has been parsed directly from the text, perhaps because
* {@link DateTimeFormatterBuilder#appendZoneId()} was used, then
* this override zone has no effect.
* If no zone has been parsed, then this override zone will be included in
* the result of the parse where it can be used to build instants and date-times.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param zone the new override zone, null if no override
* @return a formatter based on this formatter with the requested override zone, not null
*/
public DateTimeFormatter withZone(ZoneId zone) {
if (Objects.equals(this.zone, zone)) {
return this;
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, resolverFields, chrono, zone);
}
//-----------------------------------------------------------------------
/**
* Gets the resolver style to use during parsing.
* <p>
* This returns the resolver style, used during the second phase of parsing
* when fields are resolved into dates and times.
* By default, a formatter has the {@link ResolverStyle#SMART SMART} resolver style.
* See {@link #withResolverStyle(ResolverStyle)} for more details.
*
* @return the resolver style of this formatter, not null
*/
public ResolverStyle getResolverStyle() {
return resolverStyle;
}
/**
* Returns a copy of this formatter with a new resolver style.
* <p>
* This returns a formatter with similar state to this formatter but
* with the resolver style set. By default, a formatter has the
* {@link ResolverStyle#SMART SMART} resolver style.
* <p>
* Changing the resolver style only has an effect during parsing.
* Parsing a text string occurs in two phases.
* Phase 1 is a basic text parse according to the fields added to the builder.
* Phase 2 resolves the parsed field-value pairs into date and/or time objects.
* The resolver style is used to control how phase 2, resolving, happens.
* See {@code ResolverStyle} for more information on the options available.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param resolverStyle the new resolver style, not null
* @return a formatter based on this formatter with the requested resolver style, not null
*/
public DateTimeFormatter withResolverStyle(ResolverStyle resolverStyle) {
Objects.requireNonNull(resolverStyle, "resolverStyle");
if (Objects.equals(this.resolverStyle, resolverStyle)) {
return this;
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, resolverFields, chrono, zone);
}
//-----------------------------------------------------------------------
/**
* Gets the resolver fields to use during parsing.
* <p>
* This returns the resolver fields, used during the second phase of parsing
* when fields are resolved into dates and times.
* By default, a formatter has no resolver fields, and thus returns null.
* See {@link #withResolverFields(Set)} for more details.
*
* @return the immutable set of resolver fields of this formatter, null if no fields
*/
public Set<TemporalField> getResolverFields() {
return resolverFields;
}
/**
* Returns a copy of this formatter with a new set of resolver fields.
* <p>
* This returns a formatter with similar state to this formatter but with
* the resolver fields set. By default, a formatter has no resolver fields.
* <p>
* Changing the resolver fields only has an effect during parsing.
* Parsing a text string occurs in two phases.
* Phase 1 is a basic text parse according to the fields added to the builder.
* Phase 2 resolves the parsed field-value pairs into date and/or time objects.
* The resolver fields are used to filter the field-value pairs between phase 1 and 2.
* <p>
* This can be used to select between two or more ways that a date or time might
* be resolved. For example, if the formatter consists of year, month, day-of-month
* and day-of-year, then there are two ways to resolve a date.
* Calling this method with the arguments {@link ChronoField#YEAR YEAR} and
* {@link ChronoField#DAY_OF_YEAR DAY_OF_YEAR} will ensure that the date is
* resolved using the year and day-of-year, effectively meaning that the month
* and day-of-month are ignored during the resolving phase.
* <p>
* In a similar manner, this method can be used to ignore secondary fields that
* would otherwise be cross-checked. For example, if the formatter consists of year,
* month, day-of-month and day-of-week, then there is only one way to resolve a
* date, but the parsed value for day-of-week will be cross-checked against the
* resolved date. Calling this method with the arguments {@link ChronoField#YEAR YEAR},
* {@link ChronoField#MONTH_OF_YEAR MONTH_OF_YEAR} and
* {@link ChronoField#DAY_OF_MONTH DAY_OF_MONTH} will ensure that the date is
* resolved correctly, but without any cross-check for the day-of-week.
* <p>
* In implementation terms, this method behaves as follows. The result of the
* parsing phase can be considered to be a map of field to value. The behavior
* of this method is to cause that map to be filtered between phase 1 and 2,
* removing all fields other than those specified as arguments to this method.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param resolverFields the new set of resolver fields, null if no fields
* @return a formatter based on this formatter with the requested resolver style, not null
*/
public DateTimeFormatter withResolverFields(TemporalField... resolverFields) {
Set<TemporalField> fields = null;
if (resolverFields != null) {
fields = Collections.unmodifiableSet(new HashSet<>(Arrays.asList(resolverFields)));
}
if (Objects.equals(this.resolverFields, fields)) {
return this;
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, fields, chrono, zone);
}
/**
* Returns a copy of this formatter with a new set of resolver fields.
* <p>
* This returns a formatter with similar state to this formatter but with
* the resolver fields set. By default, a formatter has no resolver fields.
* <p>
* Changing the resolver fields only has an effect during parsing.
* Parsing a text string occurs in two phases.
* Phase 1 is a basic text parse according to the fields added to the builder.
* Phase 2 resolves the parsed field-value pairs into date and/or time objects.
* The resolver fields are used to filter the field-value pairs between phase 1 and 2.
* <p>
* This can be used to select between two or more ways that a date or time might
* be resolved. For example, if the formatter consists of year, month, day-of-month
* and day-of-year, then there are two ways to resolve a date.
* Calling this method with the arguments {@link ChronoField#YEAR YEAR} and
* {@link ChronoField#DAY_OF_YEAR DAY_OF_YEAR} will ensure that the date is
* resolved using the year and day-of-year, effectively meaning that the month
* and day-of-month are ignored during the resolving phase.
* <p>
* In a similar manner, this method can be used to ignore secondary fields that
* would otherwise be cross-checked. For example, if the formatter consists of year,
* month, day-of-month and day-of-week, then there is only one way to resolve a
* date, but the parsed value for day-of-week will be cross-checked against the
* resolved date. Calling this method with the arguments {@link ChronoField#YEAR YEAR},
* {@link ChronoField#MONTH_OF_YEAR MONTH_OF_YEAR} and
* {@link ChronoField#DAY_OF_MONTH DAY_OF_MONTH} will ensure that the date is
* resolved correctly, but without any cross-check for the day-of-week.
* <p>
* In implementation terms, this method behaves as follows. The result of the
* parsing phase can be considered to be a map of field to value. The behavior
* of this method is to cause that map to be filtered between phase 1 and 2,
* removing all fields other than those specified as arguments to this method.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param resolverFields the new set of resolver fields, null if no fields
* @return a formatter based on this formatter with the requested resolver style, not null
*/
public DateTimeFormatter withResolverFields(Set<TemporalField> resolverFields) {
if (Objects.equals(this.resolverFields, resolverFields)) {
return this;
}
if (resolverFields != null) {
resolverFields = Collections.unmodifiableSet(new HashSet<>(resolverFields));
}
return new DateTimeFormatter(printerParser, locale, decimalStyle, resolverStyle, resolverFields, chrono, zone);
}
//-----------------------------------------------------------------------
/**
* Formats a date-time object using this formatter.
* <p>
* This formats the date-time to a String using the rules of the formatter.
*
* @param temporal the temporal object to format, not null
* @return the formatted string, not null
* @throws DateTimeException if an error occurs during formatting
*/
public String format(TemporalAccessor temporal) {
StringBuilder buf = new StringBuilder(32);
formatTo(temporal, buf);
return buf.toString();
}
//-----------------------------------------------------------------------
/**
* Formats a date-time object to an {@code Appendable} using this formatter.
* <p>
* This outputs the formatted date-time to the specified destination.
* {@link Appendable} is a general purpose interface that is implemented by all
* key character output classes including {@code StringBuffer}, {@code StringBuilder},
* {@code PrintStream} and {@code Writer}.
* <p>
* Although {@code Appendable} methods throw an {@code IOException}, this method does not.
* Instead, any {@code IOException} is wrapped in a runtime exception.
*
* @param temporal the temporal object to format, not null
* @param appendable the appendable to format to, not null
* @throws DateTimeException if an error occurs during formatting
*/
public void formatTo(TemporalAccessor temporal, Appendable appendable) {
Objects.requireNonNull(temporal, "temporal");
Objects.requireNonNull(appendable, "appendable");
try {
DateTimePrintContext context = new DateTimePrintContext(temporal, this);
if (appendable instanceof StringBuilder) {
printerParser.format(context, (StringBuilder) appendable);
} else {
// buffer output to avoid writing to appendable in case of error
StringBuilder buf = new StringBuilder(32);
printerParser.format(context, buf);
appendable.append(buf);
}
} catch (IOException ex) {
throw new DateTimeException(ex.getMessage(), ex);
}
}
//-----------------------------------------------------------------------
/**
* Fully parses the text producing a temporal object.
* <p>
* This parses the entire text producing a temporal object.
* It is typically more useful to use {@link #parse(CharSequence, TemporalQuery)}.
* The result of this method is {@code TemporalAccessor} which has been resolved,
* applying basic validation checks to help ensure a valid date-time.
* <p>
* If the parse completes without reading the entire length of the text,
* or a problem occurs during parsing or merging, then an exception is thrown.
*
* @param text the text to parse, not null
* @return the parsed temporal object, not null
* @throws DateTimeParseException if unable to parse the requested result
*/
public TemporalAccessor parse(CharSequence text) {
Objects.requireNonNull(text, "text");
try {
return parseResolved0(text, null);
} catch (DateTimeParseException ex) {
throw ex;
} catch (RuntimeException ex) {
throw createError(text, ex);
}
}
/**
* Parses the text using this formatter, providing control over the text position.
* <p>
* This parses the text without requiring the parse to start from the beginning
* of the string or finish at the end.
* The result of this method is {@code TemporalAccessor} which has been resolved,
* applying basic validation checks to help ensure a valid date-time.
* <p>
* The text will be parsed from the specified start {@code ParsePosition}.
* The entire length of the text does not have to be parsed, the {@code ParsePosition}
* will be updated with the index at the end of parsing.
* <p>
* The operation of this method is slightly different to similar methods using
* {@code ParsePosition} on {@code java.text.Format}. That class will return
* errors using the error index on the {@code ParsePosition}. By contrast, this
* method will throw a {@link DateTimeParseException} if an error occurs, with
* the exception containing the error index.
* This change in behavior is necessary due to the increased complexity of
* parsing and resolving dates/times in this API.
* <p>
* If the formatter parses the same field more than once with different values,
* the result will be an error.
*
* @param text the text to parse, not null
* @param position the position to parse from, updated with length parsed
* and the index of any error, not null
* @return the parsed temporal object, not null
* @throws DateTimeParseException if unable to parse the requested result
* @throws IndexOutOfBoundsException if the position is invalid
*/
public TemporalAccessor parse(CharSequence text, ParsePosition position) {
Objects.requireNonNull(text, "text");
Objects.requireNonNull(position, "position");
try {
return parseResolved0(text, position);
} catch (DateTimeParseException | IndexOutOfBoundsException ex) {
throw ex;
} catch (RuntimeException ex) {
throw createError(text, ex);
}
}
//-----------------------------------------------------------------------
/**
* Fully parses the text producing an object of the specified type.
* <p>
* Most applications should use this method for parsing.
* It parses the entire text to produce the required date-time.
* The query is typically a method reference to a {@code from(TemporalAccessor)} method.
* For example:
* <pre>
* LocalDateTime dt = parser.parse(str, LocalDateTime::from);
* </pre>
* If the parse completes without reading the entire length of the text,
* or a problem occurs during parsing or merging, then an exception is thrown.
*
* @param <T> the type of the parsed date-time
* @param text the text to parse, not null
* @param query the query defining the type to parse to, not null
* @return the parsed date-time, not null
* @throws DateTimeParseException if unable to parse the requested result
*/
public <T> T parse(CharSequence text, TemporalQuery<T> query) {
Objects.requireNonNull(text, "text");
Objects.requireNonNull(query, "query");
try {
return parseResolved0(text, null).query(query);
} catch (DateTimeParseException ex) {
throw ex;
} catch (RuntimeException ex) {
throw createError(text, ex);
}
}
/**
* Fully parses the text producing an object of one of the specified types.
* <p>
* This parse method is convenient for use when the parser can handle optional elements.
* For example, a pattern of 'uuuu-MM-dd HH.mm[ VV]' can be fully parsed to a {@code ZonedDateTime},
* or partially parsed to a {@code LocalDateTime}.
* The queries must be specified in order, starting from the best matching full-parse option
* and ending with the worst matching minimal parse option.
* The query is typically a method reference to a {@code from(TemporalAccessor)} method.
* <p>
* The result is associated with the first type that successfully parses.
* Normally, applications will use {@code instanceof} to check the result.
* For example:
* <pre>
* TemporalAccessor dt = parser.parseBest(str, ZonedDateTime::from, LocalDateTime::from);
* if (dt instanceof ZonedDateTime) {
* ...
* } else {
* ...
* }
* </pre>
* If the parse completes without reading the entire length of the text,
* or a problem occurs during parsing or merging, then an exception is thrown.
*
* @param text the text to parse, not null
* @param queries the queries defining the types to attempt to parse to,
* must implement {@code TemporalAccessor}, not null
* @return the parsed date-time, not null
* @throws IllegalArgumentException if less than 2 types are specified
* @throws DateTimeParseException if unable to parse the requested result
*/
public TemporalAccessor parseBest(CharSequence text, TemporalQuery<?>... queries) {
Objects.requireNonNull(text, "text");
Objects.requireNonNull(queries, "queries");
if (queries.length < 2) {
throw new IllegalArgumentException("At least two queries must be specified");
}
try {
TemporalAccessor resolved = parseResolved0(text, null);
for (TemporalQuery<?> query : queries) {
try {
return (TemporalAccessor) resolved.query(query);
} catch (RuntimeException ex) {
// continue
}
}
throw new DateTimeException("Unable to convert parsed text using any of the specified queries");
} catch (DateTimeParseException ex) {
throw ex;
} catch (RuntimeException ex) {
throw createError(text, ex);
}
}
private DateTimeParseException createError(CharSequence text, RuntimeException ex) {
String abbr;
if (text.length() > 64) {
abbr = text.subSequence(0, 64).toString() + "...";
} else {
abbr = text.toString();
}
return new DateTimeParseException("Text '" + abbr + "' could not be parsed: " + ex.getMessage(), text, 0, ex);
}
//-----------------------------------------------------------------------
/**
* Parses and resolves the specified text.
* <p>
* This parses to a {@code TemporalAccessor} ensuring that the text is fully parsed.
*
* @param text the text to parse, not null
* @param position the position to parse from, updated with length parsed
* and the index of any error, null if parsing whole string
* @return the resolved result of the parse, not null
* @throws DateTimeParseException if the parse fails
* @throws DateTimeException if an error occurs while resolving the date or time
* @throws IndexOutOfBoundsException if the position is invalid
*/
private TemporalAccessor parseResolved0(final CharSequence text, final ParsePosition position) {
ParsePosition pos = (position != null ? position : new ParsePosition(0));
DateTimeParseContext context = parseUnresolved0(text, pos);
if (context == null || pos.getErrorIndex() >= 0 || (position == null && pos.getIndex() < text.length())) {
String abbr;
if (text.length() > 64) {
abbr = text.subSequence(0, 64).toString() + "...";
} else {
abbr = text.toString();
}
if (pos.getErrorIndex() >= 0) {
throw new DateTimeParseException("Text '" + abbr + "' could not be parsed at index " +
pos.getErrorIndex(), text, pos.getErrorIndex());
} else {
throw new DateTimeParseException("Text '" + abbr + "' could not be parsed, unparsed text found at index " +
pos.getIndex(), text, pos.getIndex());
}
}
return context.toResolved(resolverStyle, resolverFields);
}
/**
* Parses the text using this formatter, without resolving the result, intended
* for advanced use cases.
* <p>
* Parsing is implemented as a two-phase operation.
* First, the text is parsed using the layout defined by the formatter, producing
* a {@code Map} of field to value, a {@code ZoneId} and a {@code Chronology}.
* Second, the parsed data is <em>resolved</em>, by validating, combining and
* simplifying the various fields into more useful ones.
* This method performs the parsing stage but not the resolving stage.
* <p>
* The result of this method is {@code TemporalAccessor} which represents the
* data as seen in the input. Values are not validated, thus parsing a date string
* of '2012-00-65' would result in a temporal with three fields - year of '2012',
* month of '0' and day-of-month of '65'.
* <p>
* The text will be parsed from the specified start {@code ParsePosition}.
* The entire length of the text does not have to be parsed, the {@code ParsePosition}
* will be updated with the index at the end of parsing.
* <p>
* Errors are returned using the error index field of the {@code ParsePosition}
* instead of {@code DateTimeParseException}.
* The returned error index will be set to an index indicative of the error.
* Callers must check for errors before using the result.
* <p>
* If the formatter parses the same field more than once with different values,
* the result will be an error.
* <p>
* This method is intended for advanced use cases that need access to the
* internal state during parsing. Typical application code should use
* {@link #parse(CharSequence, TemporalQuery)} or the parse method on the target type.
*
* @param text the text to parse, not null
* @param position the position to parse from, updated with length parsed
* and the index of any error, not null
* @return the parsed text, null if the parse results in an error
* @throws DateTimeException if some problem occurs during parsing
* @throws IndexOutOfBoundsException if the position is invalid
*/
public TemporalAccessor parseUnresolved(CharSequence text, ParsePosition position) {
DateTimeParseContext context = parseUnresolved0(text, position);
if (context == null) {
return null;
}
return context.toUnresolved();
}
private DateTimeParseContext parseUnresolved0(CharSequence text, ParsePosition position) {
Objects.requireNonNull(text, "text");
Objects.requireNonNull(position, "position");
DateTimeParseContext context = new DateTimeParseContext(this);
int pos = position.getIndex();
pos = printerParser.parse(context, text, pos);
if (pos < 0) {
position.setErrorIndex(~pos); // index not updated from input
return null;
}
position.setIndex(pos); // errorIndex not updated from input
return context;
}
//-----------------------------------------------------------------------
/**
* Returns the formatter as a composite printer parser.
*
* @param optional whether the printer/parser should be optional
* @return the printer/parser, not null
*/
CompositePrinterParser toPrinterParser(boolean optional) {
return printerParser.withOptional(optional);
}
/**
* Returns this formatter as a {@code java.text.Format} instance.
* <p>
* The returned {@link Format} instance will format any {@link TemporalAccessor}
* and parses to a resolved {@link TemporalAccessor}.
* <p>
* Exceptions will follow the definitions of {@code Format}, see those methods
* for details about {@code IllegalArgumentException} during formatting and
* {@code ParseException} or null during parsing.
* The format does not support attributing of the returned format string.
*
* @return this formatter as a classic format instance, not null
*/
public Format toFormat() {
return new ClassicFormat(this, null);
}
/**
* Returns this formatter as a {@code java.text.Format} instance that will
* parse using the specified query.
* <p>
* The returned {@link Format} instance will format any {@link TemporalAccessor}
* and parses to the type specified.
* The type must be one that is supported by {@link #parse}.
* <p>
* Exceptions will follow the definitions of {@code Format}, see those methods
* for details about {@code IllegalArgumentException} during formatting and
* {@code ParseException} or null during parsing.
* The format does not support attributing of the returned format string.
*
* @param parseQuery the query defining the type to parse to, not null
* @return this formatter as a classic format instance, not null
*/
public Format toFormat(TemporalQuery<?> parseQuery) {
Objects.requireNonNull(parseQuery, "parseQuery");
return new ClassicFormat(this, parseQuery);
}
//-----------------------------------------------------------------------
/**
* Returns a description of the underlying formatters.
*
* @return a description of this formatter, not null
*/
@Override
public String toString() {
String pattern = printerParser.toString();
pattern = pattern.startsWith("[") ? pattern : pattern.substring(1, pattern.length() - 1);
return pattern;
// TODO: Fix tests to not depend on toString()
// return "DateTimeFormatter[" + locale +
// (chrono != null ? "," + chrono : "") +
// (zone != null ? "," + zone : "") +
// pattern + "]";
}
//-----------------------------------------------------------------------
/**
* Implements the classic Java Format API.
* @serial exclude
*/
@SuppressWarnings("serial") // not actually serializable
static class ClassicFormat extends Format {
/** The formatter. */
private final DateTimeFormatter formatter;
/** The type to be parsed. */
private final TemporalQuery<?> parseType;
/** Constructor. */
public ClassicFormat(DateTimeFormatter formatter, TemporalQuery<?> parseType) {
this.formatter = formatter;
this.parseType = parseType;
}
@Override
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
Objects.requireNonNull(obj, "obj");
Objects.requireNonNull(toAppendTo, "toAppendTo");
Objects.requireNonNull(pos, "pos");
if (obj instanceof TemporalAccessor == false) {
throw new IllegalArgumentException("Format target must implement TemporalAccessor");
}
pos.setBeginIndex(0);
pos.setEndIndex(0);
try {
formatter.formatTo((TemporalAccessor) obj, toAppendTo);
} catch (RuntimeException ex) {
throw new IllegalArgumentException(ex.getMessage(), ex);
}
return toAppendTo;
}
@Override
public Object parseObject(String text) throws ParseException {
Objects.requireNonNull(text, "text");
try {
if (parseType == null) {
return formatter.parseResolved0(text, null);
}
return formatter.parse(text, parseType);
} catch (DateTimeParseException ex) {
throw new ParseException(ex.getMessage(), ex.getErrorIndex());
} catch (RuntimeException ex) {
throw (ParseException) new ParseException(ex.getMessage(), 0).initCause(ex);
}
}
@Override
public Object parseObject(String text, ParsePosition pos) {
Objects.requireNonNull(text, "text");
DateTimeParseContext context;
try {
context = formatter.parseUnresolved0(text, pos);
} catch (IndexOutOfBoundsException ex) {
if (pos.getErrorIndex() < 0) {
pos.setErrorIndex(0);
}
return null;
}
if (context == null) {
if (pos.getErrorIndex() < 0) {
pos.setErrorIndex(0);
}
return null;
}
try {
TemporalAccessor resolved = context.toResolved(formatter.resolverStyle, formatter.resolverFields);
if (parseType == null) {
return resolved;
}
return resolved.query(parseType);
} catch (RuntimeException ex) {
pos.setErrorIndex(0);
return null;
}
}
}
}
