FastDatePrinter (library API)

java.lang.Object
- com.qiniu.android.utils.FastDatePrinter

```
public final class FastDatePrinter
extends java.lang.Object
```
FastDatePrinter is a fast and thread-safe version of SimpleDateFormat.

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 extended 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

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
Constructor and Description
`FastDatePrinter(java.lang.String pattern, java.util.TimeZone timeZone, java.util.Locale locale)` Constructs a new FastDatePrinter.

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`protected java.lang.StringBuffer`	`applyRules(java.util.Calendar calendar, java.lang.StringBuffer buf)` Deprecated. use `format(Calendar)` or `format(Calendar, Appendable)`
`boolean`	`equals(java.lang.Object obj)` Compares two objects for equality.
`java.lang.String`	`format(java.util.Calendar calendar)`
`<B extends java.lang.Appendable> B`	`format(java.util.Calendar calendar, B buf)`
`java.lang.StringBuffer`	`format(java.util.Calendar calendar, java.lang.StringBuffer buf)`
`java.lang.String`	`format(java.util.Date date)`
`<B extends java.lang.Appendable> B`	`format(java.util.Date date, B buf)`
`java.lang.StringBuffer`	`format(java.util.Date date, java.lang.StringBuffer buf)`
`java.lang.String`	`format(long millis)`
`<B extends java.lang.Appendable> B`	`format(long millis, B buf)`
`java.lang.StringBuffer`	`format(long millis, java.lang.StringBuffer buf)`
`java.lang.StringBuffer`	`format(java.lang.Object obj, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos)` Deprecated. Use {`format(Date)`, {`format(Calendar)`, {`format(long)`, or {`format(Object)`
`java.util.Locale`	`getLocale()`
`int`	`getMaxLengthEstimate()` Gets an estimate for the maximum string length that the formatter will produce.
`java.lang.String`	`getPattern()`
`java.util.TimeZone`	`getTimeZone()`
`int`	`hashCode()` Returns a hash code compatible with equals.
`protected java.util.List<com.qiniu.android.utils.FastDatePrinter.Rule>`	`parsePattern()` Returns a list of Rules given a pattern.
`protected java.lang.String`	`parseToken(java.lang.String pattern, int[] indexRef)` Performs the parsing of tokens.
`protected com.qiniu.android.utils.FastDatePrinter.NumberRule`	`selectNumberRule(int field, int padding)` Gets an appropriate rule for the padding required.
`java.lang.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
```
public FastDatePrinter(java.lang.String pattern,
                       java.util.TimeZone timeZone,
                       java.util.Locale locale)
```
    Constructs a new FastDatePrinter.
    
    Parameters:
    
    pattern - SimpleDateFormat compatible pattern
    
    timeZone - non-null time zone to use
    
    locale - non-null locale to use
    
    Throws:
    
    java.lang.NullPointerException - if pattern, timeZone, or locale is null.
- Method Detail
  - parsePattern
```
protected java.util.List<com.qiniu.android.utils.FastDatePrinter.Rule> parsePattern()
```
    Returns a list of Rules given a pattern.
    
    Returns:
    
    a List of Rule objects
    
    Throws:
    
    java.lang.IllegalArgumentException - if pattern is invalid
  - parseToken
```
protected java.lang.String parseToken(java.lang.String pattern,
                                      int[] indexRef)
```
    Performs the parsing of tokens.
    
    Parameters:
    
    pattern - the pattern
    
    indexRef - index references
    
    Returns:
    
    parsed token
  - selectNumberRule
```
protected com.qiniu.android.utils.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
```
@Deprecated
public java.lang.StringBuffer format(java.lang.Object obj,
                                                 java.lang.StringBuffer toAppendTo,
                                                 java.text.FieldPosition pos)
```
    Deprecated. Use {format(Date), {format(Calendar), {format(long), or {format(Object)
    
    Formats a Date, Calendar or Long (milliseconds) object.
    
    Parameters:
    
    obj - the object to format
    
    toAppendTo - the buffer to append to
    
    pos - the position - ignored
    
    Returns:
    
    the buffer passed in
  - format
```
public java.lang.String format(long millis)
```
  - format
```
public java.lang.String format(java.util.Date date)
```
  - format
```
public java.lang.String format(java.util.Calendar calendar)
```
  - format
```
public java.lang.StringBuffer format(long millis,
                                     java.lang.StringBuffer buf)
```
  - format
```
public java.lang.StringBuffer format(java.util.Date date,
                                     java.lang.StringBuffer buf)
```
  - format
```
public java.lang.StringBuffer format(java.util.Calendar calendar,
                                     java.lang.StringBuffer buf)
```
  - format
```
public <B extends java.lang.Appendable> B format(long millis,
                                                 B buf)
```
  - format
```
public <B extends java.lang.Appendable> B format(java.util.Date date,
                                                 B buf)
```
  - format
```
public <B extends java.lang.Appendable> B format(java.util.Calendar calendar,
                                                 B buf)
```
  - applyRules
```
@Deprecated
protected java.lang.StringBuffer applyRules(java.util.Calendar calendar,
                                                        java.lang.StringBuffer buf)
```
    Deprecated. use format(Calendar) or format(Calendar, Appendable)
    
    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 java.lang.String getPattern()
```
  - getTimeZone
```
public java.util.TimeZone getTimeZone()
```
  - getLocale
```
public java.util.Locale getLocale()
```
  - 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(java.lang.Object obj)
```
    Compares two objects for equality.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    obj - the object to compare to
    
    Returns:
    
    true if equal
  - hashCode
```
public int hashCode()
```
    Returns a hash code compatible with equals.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    a hash code compatible with equals
  - toString
```
public java.lang.String toString()
```
    Gets a debugging string version of this formatter.
    
    Overrides:
    
    toString in class java.lang.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

format

format

format

applyRules

getPattern

getTimeZone

getLocale

getMaxLengthEstimate

equals

hashCode

toString