com.fr.third.apache.log4j.pattern

类 CachedDateFormat

java.lang.Object

java.text.Format

java.text.DateFormat

com.fr.third.apache.log4j.pattern.CachedDateFormat

所有已实现的接口:

java.io.Serializable, java.lang.Cloneable

public final class CachedDateFormat
extends java.text.DateFormat

CachedDateFormat optimizes the performance of a wrapped DateFormat. The implementation is not thread-safe. If the millisecond pattern is not recognized, the class will only use the cache if the same value is requested.

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 java.text.DateFormat

java.text.DateFormat.Field

字段概要

字段

限定符和类型	字段和说明
static int	NO_MILLISECONDS Constant used to represent that there was no change observed when changing the millisecond count.
static int	UNRECOGNIZED_MILLISECONDS Constant used to represent that there was an observed change, but was an expected change.

从类继承的字段 java.text.DateFormat

AM_PM_FIELD, calendar, DATE_FIELD, DAY_OF_WEEK_FIELD, DAY_OF_WEEK_IN_MONTH_FIELD, DAY_OF_YEAR_FIELD, DEFAULT, ERA_FIELD, FULL, HOUR_OF_DAY0_FIELD, HOUR_OF_DAY1_FIELD, HOUR0_FIELD, HOUR1_FIELD, LONG, MEDIUM, MILLISECOND_FIELD, MINUTE_FIELD, MONTH_FIELD, numberFormat, SECOND_FIELD, SHORT, TIMEZONE_FIELD, WEEK_OF_MONTH_FIELD, WEEK_OF_YEAR_FIELD, YEAR_FIELD

构造器概要

构造器

构造器和说明
CachedDateFormat(java.text.DateFormat dateFormat, int expiration) Creates a new CachedDateFormat object.

方法概要

方法

限定符和类型	方法和说明
static int	findMillisecondStart(long time, java.lang.String formatted, java.text.DateFormat formatter) Finds start of millisecond field in formatted time.
java.lang.StringBuffer	format(java.util.Date date, java.lang.StringBuffer sbuf, java.text.FieldPosition fieldPosition) Formats a Date into a date/time string.
java.lang.StringBuffer	format(long now, java.lang.StringBuffer buf) Formats a millisecond count into a date/time string.
static int	getMaximumCacheValidity(java.lang.String pattern) Gets maximum cache validity for the specified SimpleDateTime conversion pattern.
java.text.NumberFormat	getNumberFormat() Gets number formatter.
java.util.Date	parse(java.lang.String s, java.text.ParsePosition pos) This method is delegated to the formatter which most likely returns null.
void	setTimeZone(java.util.TimeZone timeZone) Set timezone.

从类继承的方法 java.text.DateFormat

clone, equals, format, format, getAvailableLocales, getCalendar, getDateInstance, getDateInstance, getDateInstance, getDateTimeInstance, getDateTimeInstance, getDateTimeInstance, getInstance, getTimeInstance, getTimeInstance, getTimeInstance, getTimeZone, hashCode, isLenient, parse, parseObject, setCalendar, setLenient, setNumberFormat

从类继承的方法 java.text.Format

format, formatToCharacterIterator, parseObject

从类继承的方法 java.lang.Object

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

字段详细资料

NO_MILLISECONDS

public static final int NO_MILLISECONDS

Constant used to represent that there was no change observed when changing the millisecond count.

另请参阅:

常量字段值

UNRECOGNIZED_MILLISECONDS

public static final int UNRECOGNIZED_MILLISECONDS

Constant used to represent that there was an observed change, but was an expected change.

另请参阅:

常量字段值

构造器详细资料

CachedDateFormat

public CachedDateFormat(java.text.DateFormat dateFormat,
                int expiration)

Creates a new CachedDateFormat object.

参数:

dateFormat - Date format, may not be null.

expiration - maximum cached range in milliseconds. If the dateFormat is known to be incompatible with the caching algorithm, use a value of 0 to totally disable caching or 1 to only use cache for duplicate requests.

方法详细资料

findMillisecondStart

public static int findMillisecondStart(long time,
                       java.lang.String formatted,
                       java.text.DateFormat formatter)

Finds start of millisecond field in formatted time.

参数:

time - long time, must be integral number of seconds

formatted - String corresponding formatted string

formatter - DateFormat date format

返回:

int position in string of first digit of milliseconds, -1 indicates no millisecond field, -2 indicates unrecognized field (likely RelativeTimeDateFormat)

format

public java.lang.StringBuffer format(java.util.Date date,
                            java.lang.StringBuffer sbuf,
                            java.text.FieldPosition fieldPosition)

Formats a Date into a date/time string.

指定者:

format 在类中 java.text.DateFormat

参数:

date - the date to format.

sbuf - the string buffer to write to.

fieldPosition - remains untouched.

返回:

the formatted time string.

format

public java.lang.StringBuffer format(long now,
                            java.lang.StringBuffer buf)

Formats a millisecond count into a date/time string.

参数:

now - Number of milliseconds after midnight 1 Jan 1970 GMT.

buf - the string buffer to write to.

返回:

the formatted time string.

setTimeZone

public void setTimeZone(java.util.TimeZone timeZone)

Set timezone. Setting the timezone using getCalendar().setTimeZone() will likely cause caching to misbehave.

覆盖:

setTimeZone 在类中 java.text.DateFormat

参数:

timeZone - TimeZone new timezone

parse

public java.util.Date parse(java.lang.String s,
                   java.text.ParsePosition pos)

This method is delegated to the formatter which most likely returns null.

指定者:

parse 在类中 java.text.DateFormat

参数:

s - string representation of date.

pos - field position, unused.

返回:

parsed date, likely null.

getNumberFormat

public java.text.NumberFormat getNumberFormat()

Gets number formatter.

覆盖:

getNumberFormat 在类中 java.text.DateFormat

返回:

NumberFormat number formatter

getMaximumCacheValidity

public static int getMaximumCacheValidity(java.lang.String pattern)

Gets maximum cache validity for the specified SimpleDateTime conversion pattern.

参数:

pattern - conversion pattern, may not be null.

返回:

Duration in milliseconds from an integral second that the cache will return consistent results.