org.joda.time
Class DateTimeUtils

java.lang.Object
  org.joda.time.DateTimeUtils

public class DateTimeUtils

extends java.lang.Object

DateTimeUtils provide public utility methods for the datetime library.

DateTimeUtils is thread-safe although shared static variables are used.

Since:

1.0

Author:

Stephen Colebourne

Constructor Summary

protected

DateTimeUtils() Restrictive constructor

Method Summary

static long	currentTimeMillis() Gets the current time in milliseconds.
static Chronology	getChronology(Chronology chrono) Gets the chronology handling null.
static long	getDurationMillis(ReadableDuration duration) Gets the millisecond duration from the specified duration object handling null.
static Chronology	getInstantChronology(ReadableInstant instant) Gets the chronology from the specified instant object handling null.
static long	getInstantMillis(ReadableInstant instant) Gets the millisecond instant from the specified instant object handling null.
static Chronology	getIntervalChronology(ReadableInstant start, ReadableInstant end) Gets the chronology from the specified instant based interval handling null.
static Chronology	getIntervalChronology(ReadableInterval interval) Gets the chronology from the specified interval object handling null.
static PeriodType	getPeriodType(PeriodType type) Gets the period type handling null.
static ReadableInterval	getReadableInterval(ReadableInterval interval) Gets the interval handling null.
static DateTimeZone	getZone(DateTimeZone zone) Gets the zone handling null.
static boolean	isContiguous(ReadablePartial partial) Checks whether the partial is contiguous.
static void	setCurrentMillisFixed(long fixedMillis) Sets the current time to return a fixed millisecond time.
static void	setCurrentMillisOffset(long offsetMillis) Sets the current time to return the system time plus an offset.
static void	setCurrentMillisSystem() Resets the current time to return the system time.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DateTimeUtils

protected DateTimeUtils()

Restrictive constructor

Method Detail

currentTimeMillis

public static final long currentTimeMillis()

Gets the current time in milliseconds.

By default this returns System.currentTimeMillis(). This may be changed using other methods in this class.

Returns:

the current time in milliseconds from 1970-01-01T00:00:00Z

setCurrentMillisSystem

public static final void setCurrentMillisSystem()
                                         throws java.lang.SecurityException

Resets the current time to return the system time.

This method changes the behaviour of currentTimeMillis(). Whenever the current time is queried, System.currentTimeMillis() is used.

Throws:

java.lang.SecurityException - if the application does not have sufficient security rights

setCurrentMillisFixed

public static final void setCurrentMillisFixed(long fixedMillis)
                                        throws java.lang.SecurityException

Sets the current time to return a fixed millisecond time.

This method changes the behaviour of currentTimeMillis(). Whenever the current time is queried, the same millisecond time will be returned.

Parameters:

fixedMillis - the fixed millisecond time to use

Throws:

java.lang.SecurityException - if the application does not have sufficient security rights

setCurrentMillisOffset

public static final void setCurrentMillisOffset(long offsetMillis)
                                         throws java.lang.SecurityException

Sets the current time to return the system time plus an offset.

This method changes the behaviour of currentTimeMillis(). Whenever the current time is queried, System.currentTimeMillis() is used and then offset by adding the millisecond value specified here.

Parameters:

offsetMillis - the fixed millisecond time to use

Throws:

java.lang.SecurityException - if the application does not have sufficient security rights

getInstantMillis

public static final long getInstantMillis(ReadableInstant instant)

Gets the millisecond instant from the specified instant object handling null.

If the instant object is null, the currentTimeMillis() will be returned. Otherwise, the millis from the object are returned.

Parameters:

instant - the instant to examine, null means now

Returns:

the time in milliseconds from 1970-01-01T00:00:00Z

getInstantChronology

public static final Chronology getInstantChronology(ReadableInstant instant)

Gets the chronology from the specified instant object handling null.

If the instant object is null, or the instant's chronology is null, ISOChronology.getInstance() will be returned. Otherwise, the chronology from the object is returned.

Parameters:

instant - the instant to examine, null means ISO in the default zone

Returns:

the chronology, never null

getIntervalChronology

public static final Chronology getIntervalChronology(ReadableInstant start,
                                                     ReadableInstant end)

Gets the chronology from the specified instant based interval handling null.

The chronology is obtained from the start if that is not null, or from the end if the start is null. The result is additionally checked, and if still null then ISOChronology.getInstance() will be returned.

Parameters:

start - the instant to examine and use as the primary source of the chronology

end - the instant to examine and use as the secondary source of the chronology

Returns:

the chronology, never null

getIntervalChronology

public static final Chronology getIntervalChronology(ReadableInterval interval)

Gets the chronology from the specified interval object handling null.

If the interval object is null, or the interval's chronology is null, ISOChronology.getInstance() will be returned. Otherwise, the chronology from the object is returned.

Parameters:

interval - the interval to examine, null means ISO in the default zone

Returns:

the chronology, never null

getReadableInterval

public static final ReadableInterval getReadableInterval(ReadableInterval interval)

Gets the interval handling null.

If the interval is null, an interval representing now to now in the ISOChronology will be returned. Otherwise, the interval specified is returned.

Parameters:

interval - the interval to use, null means now to now

Returns:

the interval, never null

Since:

1.1

getChronology

public static final Chronology getChronology(Chronology chrono)

Gets the chronology handling null.

If the chronology is null, ISOChronology.getInstance() will be returned. Otherwise, the chronology is returned.

Parameters:

chrono - the chronology to use, null means ISO in the default zone

Returns:

the chronology, never null

getZone

public static final DateTimeZone getZone(DateTimeZone zone)

Gets the zone handling null.

If the zone is null, DateTimeZone.getDefault() will be returned. Otherwise, the zone specified is returned.

Parameters:

zone - the time zone to use, null means the default zone

Returns:

the time zone, never null

getPeriodType

public static final PeriodType getPeriodType(PeriodType type)

Gets the period type handling null.

If the zone is null, PeriodType.standard() will be returned. Otherwise, the type specified is returned.

Parameters:

type - the time zone to use, null means the standard type

Returns:

the type to use, never null

getDurationMillis

public static final long getDurationMillis(ReadableDuration duration)

Gets the millisecond duration from the specified duration object handling null.

If the duration object is null, zero will be returned. Otherwise, the millis from the object are returned.

Parameters:

duration - the duration to examine, null means zero

Returns:

the duration in milliseconds

isContiguous

public static final boolean isContiguous(ReadablePartial partial)

Checks whether the partial is contiguous.

A partial is contiguous if one field starts where another ends.

For example LocalDate is contiguous because DayOfMonth has the same range (Month) as the unit of the next field (MonthOfYear), and MonthOfYear has the same range (Year) as the unit of the next field (Year).

Similarly, LocalTime is contiguous, as it consists of MillisOfSecond, SecondOfMinute, MinuteOfHour and HourOfDay (note how the names of each field 'join up').

However, a Year/HourOfDay partial is not contiguous because the range field Day is not equal to the next field Year. Similarly, a DayOfWeek/DayOfMonth partial is not contiguous because the range Month is not equal to the next field Day.

Parameters:

partial - the partial to check

Returns:

true if the partial is contiguous

Throws:

java.lang.IllegalArgumentException - if the partial is null

Since:

1.1