FastDatePrinter (Apache Commons Lang 3.4 API)

java.lang.Object
- org.apache.commons.lang3.time.FastDatePrinter

All Implemented Interfaces:

Serializable, DatePrinter
```
public class FastDatePrinter
extends Object
implements DatePrinter, Serializable
```
FastDatePrinter is a fast and thread-safe version of SimpleDateFormat.

To obtain a FastDatePrinter, use FastDateFormat.getInstance(String, TimeZone, Locale) or another variation of the factory methods of FastDateFormat.

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: FastDatePrinter.java 1669774 2015-03-28 13:39:38Z britter $

See Also:
FastDateParser, Serialized Form

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`	`FastDatePrinter(String pattern, TimeZone timeZone, Locale locale)` Constructs a new FastDatePrinter.

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 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.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 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
  - FastDatePrinter
```
protected FastDatePrinter(String pattern,
               TimeZone timeZone,
               Locale locale)
```
    Constructs a new FastDatePrinter.
    Use FastDateFormat.getInstance(String, TimeZone, Locale) or another variation of the factory methods of FastDateFormat to get a cached FastDatePrinter instance.
    
    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.
- Method Detail
  - parsePattern
```
protected List<org.apache.commons.lang3.time.FastDatePrinter.Rule> parsePattern()
```
    Returns a list of Rules given a pattern.
    
    Returns:
    a List of Rule objects
    
    Throws:
    
    IllegalArgumentException - if pattern is invalid
  - parseToken
```
protected String parseToken(String pattern,
                int[] indexRef)
```
    Performs the parsing of tokens.
    
    Parameters:
    pattern - the pattern
    indexRef - index references
    
    Returns:
    parsed token
  - selectNumberRule
```
protected org.apache.commons.lang3.time.FastDatePrinter.NumberRule selectNumberRule(int field,
                                                                        int padding)
```
    Gets an appropriate rule for the padding required.
    
    Parameters:
    field - the field to get a rule for
    padding - the padding required
    
    Returns:
    a new rule with the correct padding
  - format
```
public StringBuffer format(Object obj,
                  StringBuffer toAppendTo,
                  FieldPosition pos)
```
    Formats a Date, Calendar or Long (milliseconds) object.
    
    Specified by:
    
    format in interface DatePrinter
    
    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)
```
    Description copied from interface: DatePrinter
    
    Formats a millisecond long value.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    millis - the millisecond value to format
    
    Returns:
    the formatted string
  - format
```
public String format(Date date)
```
    Description copied from interface: DatePrinter
    
    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)
```
    Description copied from interface: DatePrinter
    
    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)
```
    Description copied from interface: DatePrinter
    
    Formats a milliseond 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
  - format
```
public StringBuffer format(Date date,
                  StringBuffer buf)
```
    Description copied from interface: DatePrinter
    
    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)
```
    Description copied from interface: DatePrinter
    
    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
  - 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
  - getPattern
```
public String getPattern()
```
    Description copied from interface: DatePrinter
    
    Gets the pattern used by this printer.
    
    Specified by:
    
    getPattern in interface DatePrinter
    
    Returns:
    the pattern, SimpleDateFormat compatible
  - 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 interface DatePrinter
    
    Returns:
    the time zone
  - getLocale
```
public Locale getLocale()
```
    Description copied from interface: DatePrinter
    
    Gets the locale used by this printer.
    
    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

Class FastDatePrinter

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

FULL

LONG

MEDIUM

SHORT

Constructor Detail

FastDatePrinter

Method Detail

parsePattern

parseToken

selectNumberRule

format

format

format

format

format

format

format

applyRules

getPattern

getTimeZone

getLocale

getMaxLengthEstimate

equals

hashCode

toString