public class FastDatePrinter extends Object implements DatePrinter, Serializable
FastDatePrinter is a fast and thread-safe version of
SimpleDateFormat
.
This class can be used as a direct replacement to
SimpleDateFormat
in most formatting 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.
Only formatting is supported, but all patterns are compatible with SimpleDateFormat (except time zones and some year patterns - see below).
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
ISO8601 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. FastDatePrinter implements the behavior of Java 7.
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.
|
Modifier | Constructor and Description |
---|---|
protected |
FastDatePrinter(String pattern,
TimeZone timeZone,
Locale locale)
Constructs a new FastDatePrinter.
|
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 milliseond
long value into the
supplied StringBuffer . |
StringBuffer |
format(Object obj,
StringBuffer toAppendTo,
FieldPosition pos)
Formats a
Date , Calendar or
Long (milliseconds) object. |
Locale |
getLocale()
Gets the locale used by this printer.
|
int |
getMaxLengthEstimate()
Gets an estimate for the maximum string length that the
formatter will produce.
|
String |
getPattern()
Gets the pattern used by this printer.
|
TimeZone |
getTimeZone()
Gets the time zone used by this printer.
|
int |
hashCode()
Returns a hashcode compatible with equals.
|
protected List<org.apache.commons.lang3.time.FastDatePrinter.Rule> |
parsePattern()
Returns a list of Rules given a pattern.
|
protected String |
parseToken(String pattern,
int[] indexRef)
Performs the parsing of tokens.
|
protected org.apache.commons.lang3.time.FastDatePrinter.NumberRule |
selectNumberRule(int field,
int padding)
Gets an appropriate rule for the padding required.
|
String |
toString()
Gets a debugging string version of this formatter.
|
public static final int FULL
public static final int LONG
public static final int MEDIUM
public static final int SHORT
protected FastDatePrinter(String pattern, TimeZone timeZone, Locale locale)
Constructs a new FastDatePrinter.
pattern
- SimpleDateFormat
compatible patterntimeZone
- non-null time zone to uselocale
- non-null locale to useNullPointerException
- if pattern, timeZone, or locale is null.protected List<org.apache.commons.lang3.time.FastDatePrinter.Rule> parsePattern()
Returns a list of Rules given a pattern.
List
of Rule objectsIllegalArgumentException
- if pattern is invalidprotected String parseToken(String pattern, int[] indexRef)
Performs the parsing of tokens.
pattern
- the patternindexRef
- index referencesprotected org.apache.commons.lang3.time.FastDatePrinter.NumberRule selectNumberRule(int field, int padding)
Gets an appropriate rule for the padding required.
field
- the field to get a rule forpadding
- the padding requiredpublic StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
Formats a Date
, Calendar
or
Long
(milliseconds) object.
format
in interface DatePrinter
obj
- the object to formattoAppendTo
- the buffer to append topos
- the position - ignoredpublic String format(long millis)
DatePrinter
Formats a millisecond long
value.
format
in interface DatePrinter
millis
- the millisecond value to formatpublic String format(Date date)
DatePrinter
Formats a Date
object using a GregorianCalendar
.
format
in interface DatePrinter
date
- the date to formatpublic String format(Calendar calendar)
DatePrinter
Formats a Calendar
object.
format
in interface DatePrinter
calendar
- the calendar to formatpublic StringBuffer format(long millis, StringBuffer buf)
DatePrinter
Formats a milliseond long
value into the
supplied StringBuffer
.
format
in interface DatePrinter
millis
- the millisecond value to formatbuf
- the buffer to format intopublic StringBuffer format(Date date, StringBuffer buf)
DatePrinter
Formats a Date
object into the
supplied StringBuffer
using a GregorianCalendar
.
format
in interface DatePrinter
date
- the date to formatbuf
- the buffer to format intopublic StringBuffer format(Calendar calendar, StringBuffer buf)
DatePrinter
Formats a Calendar
object into the
supplied StringBuffer
.
format
in interface DatePrinter
calendar
- the calendar to formatbuf
- the buffer to format intoprotected StringBuffer applyRules(Calendar calendar, StringBuffer buf)
Performs the formatting by applying the rules to the specified calendar.
calendar
- the calendar to formatbuf
- the buffer to format intopublic String getPattern()
DatePrinter
Gets the pattern used by this printer.
getPattern
in interface DatePrinter
SimpleDateFormat
compatiblepublic TimeZone getTimeZone()
DatePrinter
Gets the time zone used by this printer.
This zone is always used for Date
printing.
getTimeZone
in interface DatePrinter
public Locale getLocale()
DatePrinter
Gets the locale used by this printer.
getLocale
in interface DatePrinter
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.
public int hashCode()
Returns a hashcode compatible with equals.
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