org.apache.commons.lang3.time

Class FastDateFormat

java.lang.Object

java.text.Format

org.apache.commons.lang3.time.FastDateFormat

All Implemented Interfaces:

Serializable, Cloneable, DateParser, DatePrinter

public class FastDateFormat
extends Format
implements DateParser, DatePrinter

FastDateFormat is a fast and thread-safe version of SimpleDateFormat.

To obtain an instance of FastDateFormat, use one of the static factory methods: getInstance(String, TimeZone, Locale), getDateInstance(int, TimeZone, Locale), getTimeInstance(int, TimeZone, Locale), or getDateTimeInstance(int, int, TimeZone, Locale)

Since FastDateFormat is thread safe, you can use a static member instance:

private static final FastDateFormat DATE_FORMATTER = FastDateFormat.getDateTimeInstance(FastDateFormat.LONG, FastDateFormat.SHORT);

This class can be used as a direct replacement to SimpleDateFormat in most formatting and parsing situations. This class is especially useful in multi-threaded server environments. SimpleDateFormat is not thread-safe in any JDK version, nor will it be as Sun have closed the bug/RFE.

All patterns are compatible with SimpleDateFormat (except time zones and some year patterns - see below).

Since 3.2, FastDateFormat supports parsing as well as printing.

Java 1.4 introduced a new pattern letter, 'Z', to represent time zones in RFC822 format (eg. +0800 or -1100). This pattern letter can be used here (on all JDK versions).

In addition, the pattern 'ZZ' has been made to represent ISO 8601 full format time zones (eg. +08:00 or -11:00). This introduces a minor incompatibility with Java 1.4, but at a gain of useful functionality.

Javadoc cites for the year pattern: For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number. Starting with Java 1.7 a pattern of 'Y' or 'YYY' will be formatted as '2003', while it was '03' in former Java versions. FastDateFormat implements the behavior of Java 7.

Since:

2.0

Version:

$Id: FastDateFormat.java 1591488 2014-04-30 21:49:35Z ggregory $

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.text.Format

Format.Field

Field Summary

Fields

Modifier and Type	Field and Description
static int	FULL FULL locale dependent date or time style.
static int	LONG LONG locale dependent date or time style.
static int	MEDIUM MEDIUM locale dependent date or time style.
static int	SHORT SHORT locale dependent date or time style.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FastDateFormat(String pattern, TimeZone timeZone, Locale locale) Constructs a new FastDateFormat.
protected	FastDateFormat(String pattern, TimeZone timeZone, Locale locale, Date centuryStart) Constructs a new FastDateFormat.

Method Summary

Methods

Modifier and Type	Method and Description
protected StringBuffer	applyRules(Calendar calendar, StringBuffer buf) Performs the formatting by applying the rules to the specified calendar.
boolean	equals(Object obj) Compares two objects for equality.
String	format(Calendar calendar) Formats a Calendar object.
StringBuffer	format(Calendar calendar, StringBuffer buf) Formats a Calendar object into the supplied StringBuffer.
String	format(Date date) Formats a Date object using a GregorianCalendar.
StringBuffer	format(Date date, StringBuffer buf) Formats a Date object into the supplied StringBuffer using a GregorianCalendar.
String	format(long millis) Formats a millisecond long value.
StringBuffer	format(long millis, StringBuffer buf) Formats a millisecond long value into the supplied StringBuffer.
StringBuffer	format(Object obj, StringBuffer toAppendTo, FieldPosition pos) Formats a Date, Calendar or Long (milliseconds) object.
static FastDateFormat	getDateInstance(int style) Gets a date formatter instance using the specified style in the default time zone and locale.
static FastDateFormat	getDateInstance(int style, Locale locale) Gets a date formatter instance using the specified style and locale in the default time zone.
static FastDateFormat	getDateInstance(int style, TimeZone timeZone) Gets a date formatter instance using the specified style and time zone in the default locale.
static FastDateFormat	getDateInstance(int style, TimeZone timeZone, Locale locale) Gets a date formatter instance using the specified style, time zone and locale.
static FastDateFormat	getDateTimeInstance(int dateStyle, int timeStyle) Gets a date/time formatter instance using the specified style in the default time zone and locale.
static FastDateFormat	getDateTimeInstance(int dateStyle, int timeStyle, Locale locale) Gets a date/time formatter instance using the specified style and locale in the default time zone.
static FastDateFormat	getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone) Gets a date/time formatter instance using the specified style and time zone in the default locale.
static FastDateFormat	getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone, Locale locale) Gets a date/time formatter instance using the specified style, time zone and locale.
static FastDateFormat	getInstance() Gets a formatter instance using the default pattern in the default locale.
static FastDateFormat	getInstance(String pattern) Gets a formatter instance using the specified pattern in the default locale.
static FastDateFormat	getInstance(String pattern, Locale locale) Gets a formatter instance using the specified pattern and locale.
static FastDateFormat	getInstance(String pattern, TimeZone timeZone) Gets a formatter instance using the specified pattern and time zone.
static FastDateFormat	getInstance(String pattern, TimeZone timeZone, Locale locale) Gets a formatter instance using the specified pattern, time zone and locale.
Locale	getLocale() Gets the locale used by this formatter.
int	getMaxLengthEstimate() Gets an estimate for the maximum string length that the formatter will produce.
String	getPattern() Gets the pattern used by this formatter.
static FastDateFormat	getTimeInstance(int style) Gets a time formatter instance using the specified style in the default time zone and locale.
static FastDateFormat	getTimeInstance(int style, Locale locale) Gets a time formatter instance using the specified style and locale in the default time zone.
static FastDateFormat	getTimeInstance(int style, TimeZone timeZone) Gets a time formatter instance using the specified style and time zone in the default locale.
static FastDateFormat	getTimeInstance(int style, TimeZone timeZone, Locale locale) Gets a time formatter instance using the specified style, time zone and locale.
TimeZone	getTimeZone() Gets the time zone used by this formatter.
int	hashCode() Returns a hashcode compatible with equals.
Date	parse(String source) Equivalent to DateFormat.parse(String).
Date	parse(String source, ParsePosition pos) Equivalent to DateFormat.parse(String, ParsePosition).
Object	parseObject(String source, ParsePosition pos) Parse a date/time string according to the given parse position.
String	toString() Gets a debugging string version of this formatter.

Methods inherited from class java.text.Format

clone, format, formatToCharacterIterator, parseObject

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.lang3.time.DateParser

parseObject

Field Detail

FULL

public static final int FULL

FULL locale dependent date or time style.

See Also:

Constant Field Values

LONG

public static final int LONG

LONG locale dependent date or time style.

See Also:

Constant Field Values

MEDIUM

public static final int MEDIUM

MEDIUM locale dependent date or time style.

See Also:

Constant Field Values

SHORT

public static final int SHORT

SHORT locale dependent date or time style.

See Also:

Constant Field Values

Constructor Detail

FastDateFormat

protected FastDateFormat(String pattern,
              TimeZone timeZone,
              Locale locale)

Constructs a new FastDateFormat.

Parameters:

pattern - SimpleDateFormat compatible pattern

timeZone - non-null time zone to use

locale - non-null locale to use

Throws:

NullPointerException - if pattern, timeZone, or locale is null.

FastDateFormat

protected FastDateFormat(String pattern,
              TimeZone timeZone,
              Locale locale,
              Date centuryStart)

Constructs a new FastDateFormat.

Parameters:

pattern - SimpleDateFormat compatible pattern

timeZone - non-null time zone to use

locale - non-null locale to use

centuryStart - The start of the 100 year period to use as the "default century" for 2 digit year parsing. If centuryStart is null, defaults to now - 80 years

Throws:

NullPointerException - if pattern, timeZone, or locale is null.

Method Detail

getInstance

public static FastDateFormat getInstance()

Gets a formatter instance using the default pattern in the default locale.

Returns:

a date/time formatter

getInstance

public static FastDateFormat getInstance(String pattern)

Gets a formatter instance using the specified pattern in the default locale.

Parameters:

pattern - SimpleDateFormat compatible pattern

Returns:

a pattern based date/time formatter

Throws:

IllegalArgumentException - if pattern is invalid

getInstance

public static FastDateFormat getInstance(String pattern,
                         TimeZone timeZone)

Gets a formatter instance using the specified pattern and time zone.

Parameters:

pattern - SimpleDateFormat compatible pattern

timeZone - optional time zone, overrides time zone of formatted date

Returns:

a pattern based date/time formatter

Throws:

IllegalArgumentException - if pattern is invalid

getInstance

public static FastDateFormat getInstance(String pattern,
                         Locale locale)

Gets a formatter instance using the specified pattern and locale.

Parameters:

pattern - SimpleDateFormat compatible pattern

locale - optional locale, overrides system locale

Returns:

a pattern based date/time formatter

Throws:

IllegalArgumentException - if pattern is invalid

getInstance

public static FastDateFormat getInstance(String pattern,
                         TimeZone timeZone,
                         Locale locale)

Gets a formatter instance using the specified pattern, time zone and locale.

Parameters:

pattern - SimpleDateFormat compatible pattern

timeZone - optional time zone, overrides time zone of formatted date

locale - optional locale, overrides system locale

Returns:

a pattern based date/time formatter

Throws:

IllegalArgumentException - if pattern is invalid or null

getDateInstance

public static FastDateFormat getDateInstance(int style)

Gets a date formatter instance using the specified style in the default time zone and locale.

Parameters:

style - date style: FULL, LONG, MEDIUM, or SHORT

Returns:

a localized standard date formatter

Throws:

IllegalArgumentException - if the Locale has no date pattern defined

Since:

2.1

getDateInstance

public static FastDateFormat getDateInstance(int style,
                             Locale locale)

Gets a date formatter instance using the specified style and locale in the default time zone.

Parameters:

style - date style: FULL, LONG, MEDIUM, or SHORT

locale - optional locale, overrides system locale

Returns:

a localized standard date formatter

Throws:

IllegalArgumentException - if the Locale has no date pattern defined

Since:

2.1

getDateInstance

public static FastDateFormat getDateInstance(int style,
                             TimeZone timeZone)

Gets a date formatter instance using the specified style and time zone in the default locale.

Parameters:

style - date style: FULL, LONG, MEDIUM, or SHORT

timeZone - optional time zone, overrides time zone of formatted date

Returns:

a localized standard date formatter

Throws:

IllegalArgumentException - if the Locale has no date pattern defined

Since:

2.1

getDateInstance

public static FastDateFormat getDateInstance(int style,
                             TimeZone timeZone,
                             Locale locale)

Gets a date formatter instance using the specified style, time zone and locale.

Parameters:

style - date style: FULL, LONG, MEDIUM, or SHORT

timeZone - optional time zone, overrides time zone of formatted date

locale - optional locale, overrides system locale

Returns:

a localized standard date formatter

Throws:

IllegalArgumentException - if the Locale has no date pattern defined

getTimeInstance

public static FastDateFormat getTimeInstance(int style)

Gets a time formatter instance using the specified style in the default time zone and locale.

Parameters:

style - time style: FULL, LONG, MEDIUM, or SHORT

Returns:

a localized standard time formatter

Throws:

IllegalArgumentException - if the Locale has no time pattern defined

Since:

2.1

getTimeInstance

public static FastDateFormat getTimeInstance(int style,
                             Locale locale)

Gets a time formatter instance using the specified style and locale in the default time zone.

Parameters:

style - time style: FULL, LONG, MEDIUM, or SHORT

locale - optional locale, overrides system locale

Returns:

a localized standard time formatter

Throws:

IllegalArgumentException - if the Locale has no time pattern defined

Since:

2.1

getTimeInstance

public static FastDateFormat getTimeInstance(int style,
                             TimeZone timeZone)

Gets a time formatter instance using the specified style and time zone in the default locale.

Parameters:

style - time style: FULL, LONG, MEDIUM, or SHORT

timeZone - optional time zone, overrides time zone of formatted time

Returns:

a localized standard time formatter

Throws:

IllegalArgumentException - if the Locale has no time pattern defined

Since:

2.1

getTimeInstance

public static FastDateFormat getTimeInstance(int style,
                             TimeZone timeZone,
                             Locale locale)

Gets a time formatter instance using the specified style, time zone and locale.

Parameters:

style - time style: FULL, LONG, MEDIUM, or SHORT

timeZone - optional time zone, overrides time zone of formatted time

locale - optional locale, overrides system locale

Returns:

a localized standard time formatter

Throws:

IllegalArgumentException - if the Locale has no time pattern defined

getDateTimeInstance

public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle)

Gets a date/time formatter instance using the specified style in the default time zone and locale.

Parameters:

dateStyle - date style: FULL, LONG, MEDIUM, or SHORT

timeStyle - time style: FULL, LONG, MEDIUM, or SHORT

Returns:

a localized standard date/time formatter

Throws:

IllegalArgumentException - if the Locale has no date/time pattern defined

Since:

2.1

getDateTimeInstance

public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle,
                                 Locale locale)

Gets a date/time formatter instance using the specified style and locale in the default time zone.

Parameters:

dateStyle - date style: FULL, LONG, MEDIUM, or SHORT

timeStyle - time style: FULL, LONG, MEDIUM, or SHORT

locale - optional locale, overrides system locale

Returns:

a localized standard date/time formatter

Throws:

IllegalArgumentException - if the Locale has no date/time pattern defined

Since:

2.1

getDateTimeInstance

public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle,
                                 TimeZone timeZone)

Gets a date/time formatter instance using the specified style and time zone in the default locale.

Parameters:

dateStyle - date style: FULL, LONG, MEDIUM, or SHORT

timeStyle - time style: FULL, LONG, MEDIUM, or SHORT

timeZone - optional time zone, overrides time zone of formatted date

Returns:

a localized standard date/time formatter

Throws:

IllegalArgumentException - if the Locale has no date/time pattern defined

Since:

2.1

getDateTimeInstance

public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle,
                                 TimeZone timeZone,
                                 Locale locale)

Gets a date/time formatter instance using the specified style, time zone and locale.

Parameters:

dateStyle - date style: FULL, LONG, MEDIUM, or SHORT

timeStyle - time style: FULL, LONG, MEDIUM, or SHORT

timeZone - optional time zone, overrides time zone of formatted date

locale - optional locale, overrides system locale

Returns:

a localized standard date/time formatter

Throws:

IllegalArgumentException - if the Locale has no date/time pattern defined

format

public StringBuffer format(Object obj,
                  StringBuffer toAppendTo,
                  FieldPosition pos)

Formats a Date, Calendar or Long (milliseconds) object.

Specified by:

format in interface DatePrinter

Specified by:

format in class Format

Parameters:

obj - the object to format

toAppendTo - the buffer to append to

pos - the position - ignored

Returns:

the buffer passed in

format

public String format(long millis)

Formats a millisecond long value.

Specified by:

format in interface DatePrinter

Parameters:

millis - the millisecond value to format

Returns:

the formatted string

Since:

2.1

format

public String format(Date date)

Formats a Date object using a GregorianCalendar.

Specified by:

format in interface DatePrinter

Parameters:

date - the date to format

Returns:

the formatted string

format

public String format(Calendar calendar)

Formats a Calendar object.

Specified by:

format in interface DatePrinter

Parameters:

calendar - the calendar to format

Returns:

the formatted string

format

public StringBuffer format(long millis,
                  StringBuffer buf)

Formats a millisecond long value into the supplied StringBuffer.

Specified by:

format in interface DatePrinter

Parameters:

millis - the millisecond value to format

buf - the buffer to format into

Returns:

the specified string buffer

Since:

2.1

format

public StringBuffer format(Date date,
                  StringBuffer buf)

Formats a Date object into the supplied StringBuffer using a GregorianCalendar.

Specified by:

format in interface DatePrinter

Parameters:

date - the date to format

buf - the buffer to format into

Returns:

the specified string buffer

format

public StringBuffer format(Calendar calendar,
                  StringBuffer buf)

Formats a Calendar object into the supplied StringBuffer.

Specified by:

format in interface DatePrinter

Parameters:

calendar - the calendar to format

buf - the buffer to format into

Returns:

the specified string buffer

parse

public Date parse(String source)
           throws ParseException

Description copied from interface: DateParser

Equivalent to DateFormat.parse(String). See DateFormat.parse(String) for more information.

Specified by:

parse in interface DateParser

Parameters:

source - A String whose beginning should be parsed.

Returns:

A Date parsed from the string

Throws:

ParseException - if the beginning of the specified string cannot be parsed.

parse

public Date parse(String source,
         ParsePosition pos)

Description copied from interface: DateParser

Equivalent to DateFormat.parse(String, ParsePosition). See DateFormat.parse(String, ParsePosition) for more information.

Specified by:

parse in interface DateParser

Parameters:

source - A String, part of which should be parsed.

pos - A ParsePosition object with index and error index information as described above.

Returns:

A Date parsed from the string. In case of error, returns null.

parseObject

public Object parseObject(String source,
                 ParsePosition pos)

Description copied from interface: DateParser

Parse a date/time string according to the given parse position.

Specified by:

parseObject in interface DateParser

Specified by:

parseObject in class Format

Parameters:

source - A String whose beginning should be parsed.

pos - the parse position

Returns:

a java.util.Date object

See Also:

DateFormat.parseObject(String, ParsePosition)

getPattern

public String getPattern()

Gets the pattern used by this formatter.

Specified by:

getPattern in interface DateParser

Specified by:

getPattern in interface DatePrinter

Returns:

the pattern, SimpleDateFormat compatible

getTimeZone

public TimeZone getTimeZone()

Gets the time zone used by this formatter.

This zone is always used for Date formatting.

Specified by:

getTimeZone in interface DateParser

Specified by:

getTimeZone in interface DatePrinter

Returns:

the time zone

getLocale

public Locale getLocale()

Gets the locale used by this formatter.

Specified by:

getLocale in interface DateParser

Specified by:

getLocale in interface DatePrinter

Returns:

the locale

getMaxLengthEstimate

public int getMaxLengthEstimate()

Gets an estimate for the maximum string length that the formatter will produce.

The actual formatted length will almost always be less than or equal to this amount.

Returns:

the maximum formatted length

equals

public boolean equals(Object obj)

Compares two objects for equality.

Overrides:

equals in class Object

Parameters:

obj - the object to compare to

Returns:

true if equal

hashCode

public int hashCode()

Returns a hashcode compatible with equals.

Overrides:

hashCode in class Object

Returns:

a hashcode compatible with equals

toString

public String toString()

Gets a debugging string version of this formatter.

Overrides:

toString in class Object

Returns:

a debugging string

applyRules

protected StringBuffer applyRules(Calendar calendar,
                      StringBuffer buf)

Performs the formatting by applying the rules to the specified calendar.

Parameters:

calendar - the calendar to format

buf - the buffer to format into

Returns:

the specified string buffer