Class FastDatePrinter
- java.lang.Object
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- org.sqlite.date.FastDatePrinter
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- All Implemented Interfaces:
Serializable
,DatePrinter
public class FastDatePrinter extends Object implements DatePrinter, Serializable
FastDatePrinter is a fast and thread-safe version ofSimpleDateFormat
.To obtain a FastDatePrinter, use
FastDateFormat.getInstance(String, TimeZone, Locale)
or another variation of the factory methods ofFastDateFormat
.Since FastDatePrinter is thread safe, you can use a static member instance:
private static final DatePrinter DATE_PRINTER = FastDateFormat.getInstance("yyyy-MM-dd");
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 by this class, 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 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.Starting with JDK7, ISO 8601 support was added using the pattern
'X'
. To maintain compatibility,'ZZ'
will continue to be supported, but using one of the'X'
formats is recommended.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.
- Since:
- 3.2
- Version:
- $Id$
- See Also:
FastDateParser
, Serialized Form
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Constructor Summary
Constructors Modifier Constructor Description protected
FastDatePrinter(String pattern, TimeZone timeZone, Locale locale)
Constructs a new FastDatePrinter.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method 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(long millis)
Formats a millisecondlong
value.StringBuffer
format(long millis, StringBuffer buf)
Formats a millisecondlong
value into the suppliedStringBuffer
.StringBuffer
format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
Formats aDate
,Calendar
orLong
(milliseconds) object.String
format(Calendar calendar)
Formats aCalendar
object.StringBuffer
format(Calendar calendar, StringBuffer buf)
Formats aCalendar
object into the suppliedStringBuffer
.String
format(Date date)
Formats aDate
object using aGregorianCalendar
.StringBuffer
format(Date date, StringBuffer buf)
Formats aDate
object into the suppliedStringBuffer
using aGregorianCalendar
.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.sqlite.date.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.sqlite.date.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.
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Field Detail
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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
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MEDIUM
public static final int MEDIUM
MEDIUM locale dependent date or time style.- See Also:
- Constant Field Values
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SHORT
public static final int SHORT
SHORT locale dependent date or time style.- See Also:
- Constant Field Values
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Constructor Detail
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FastDatePrinter
protected FastDatePrinter(String pattern, TimeZone timeZone, Locale locale)
Constructs a new FastDatePrinter. UseFastDateFormat.getInstance(String, TimeZone, Locale)
or another variation of the factory methods ofFastDateFormat
to get a cached FastDatePrinter instance.- Parameters:
pattern
-SimpleDateFormat
compatible patterntimeZone
- non-null time zone to uselocale
- non-null locale to use- Throws:
NullPointerException
- if pattern, timeZone, or locale is null.
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Method Detail
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parsePattern
protected List<org.sqlite.date.FastDatePrinter.Rule> parsePattern()
Returns a list of Rules given a pattern.- Returns:
- a
List
of Rule objects - Throws:
IllegalArgumentException
- if pattern is invalid
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parseToken
protected String parseToken(String pattern, int[] indexRef)
Performs the parsing of tokens.- Parameters:
pattern
- the patternindexRef
- index references- Returns:
- parsed token
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selectNumberRule
protected org.sqlite.date.FastDatePrinter.NumberRule selectNumberRule(int field, int padding)
Gets an appropriate rule for the padding required.- Parameters:
field
- the field to get a rule forpadding
- the padding required- Returns:
- a new rule with the correct padding
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format
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
Formats aDate
,Calendar
orLong
(milliseconds) object.- Specified by:
format
in interfaceDatePrinter
- Parameters:
obj
- the object to formattoAppendTo
- the buffer to append topos
- the position - ignored- Returns:
- the buffer passed in
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format
public String format(long millis)
Description copied from interface:DatePrinter
Formats a millisecondlong
value.- Specified by:
format
in interfaceDatePrinter
- Parameters:
millis
- the millisecond value to format- Returns:
- the formatted string
-
format
public String format(Date date)
Description copied from interface:DatePrinter
Formats aDate
object using aGregorianCalendar
.- Specified by:
format
in interfaceDatePrinter
- Parameters:
date
- the date to format- Returns:
- the formatted string
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format
public String format(Calendar calendar)
Description copied from interface:DatePrinter
Formats aCalendar
object.- Specified by:
format
in interfaceDatePrinter
- Parameters:
calendar
- the calendar to format- Returns:
- the formatted string
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format
public StringBuffer format(long millis, StringBuffer buf)
Description copied from interface:DatePrinter
Formats a millisecondlong
value into the suppliedStringBuffer
.- Specified by:
format
in interfaceDatePrinter
- Parameters:
millis
- the millisecond value to formatbuf
- the buffer to format into- Returns:
- the specified string buffer
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format
public StringBuffer format(Date date, StringBuffer buf)
Description copied from interface:DatePrinter
Formats aDate
object into the suppliedStringBuffer
using aGregorianCalendar
.- Specified by:
format
in interfaceDatePrinter
- Parameters:
date
- the date to formatbuf
- the buffer to format into- Returns:
- the specified string buffer
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format
public StringBuffer format(Calendar calendar, StringBuffer buf)
Description copied from interface:DatePrinter
Formats aCalendar
object into the suppliedStringBuffer
.- Specified by:
format
in interfaceDatePrinter
- Parameters:
calendar
- the calendar to formatbuf
- the buffer to format into- Returns:
- the specified string buffer
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applyRules
protected StringBuffer applyRules(Calendar calendar, StringBuffer buf)
Performs the formatting by applying the rules to the specified calendar.- Parameters:
calendar
- the calendar to formatbuf
- the buffer to format into- Returns:
- the specified string buffer
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getPattern
public String getPattern()
Description copied from interface:DatePrinter
Gets the pattern used by this printer.- Specified by:
getPattern
in interfaceDatePrinter
- Returns:
- the pattern,
SimpleDateFormat
compatible
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getTimeZone
public TimeZone getTimeZone()
Description copied from interface:DatePrinter
Gets the time zone used by this printer.This zone is always used for
Date
printing.- Specified by:
getTimeZone
in interfaceDatePrinter
- Returns:
- the time zone
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getLocale
public Locale getLocale()
Description copied from interface:DatePrinter
Gets the locale used by this printer.- Specified by:
getLocale
in interfaceDatePrinter
- Returns:
- the locale
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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
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equals
public boolean equals(Object obj)
Compares two objects for equality.
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hashCode
public int hashCode()
Returns a hashcode compatible with equals.
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