org.jfree.data.time

Class RegularTimePeriod

java.lang.Object

org.jfree.data.time.RegularTimePeriod

All Implemented Interfaces:

Comparable, MonthConstants, TimePeriod

Direct Known Subclasses:

Day, FixedMillisecond, Hour, Millisecond, Minute, Month, Quarter, Second, Week, Year

public abstract class RegularTimePeriod
extends Object
implements TimePeriod, Comparable, MonthConstants

An abstract class representing a unit of time. Convenient methods are provided for calculating the next and previous time periods. Conversion methods are defined that return the first and last milliseconds of the time period. The results from these methods are timezone dependent.

This class is immutable, and all subclasses should be immutable also.

Field Summary

Fields inherited from interface org.jfree.chart.date.MonthConstants

APRIL, AUGUST, DECEMBER, FEBRUARY, JANUARY, JULY, JUNE, MARCH, MAY, NOVEMBER, OCTOBER, SEPTEMBER

Constructor Summary

Constructors

Constructor and Description
RegularTimePeriod()

Method Summary

Modifier and Type	Method and Description
static RegularTimePeriod	createInstance(Class c, Date millisecond, TimeZone zone, Locale locale) Creates a time period that includes the specified millisecond, assuming the given time zone.
static Class	downsize(Class c) Returns a subclass of RegularTimePeriod that is smaller than the specified class.
Date	getEnd() Returns the date/time that marks the end of the time period.
abstract long	getFirstMillisecond() Returns the first millisecond of the time period.
abstract long	getFirstMillisecond(Calendar calendar) Returns the first millisecond of the time period, evaluated using the supplied calendar (which incorporates a timezone).
abstract long	getLastMillisecond() Returns the last millisecond of the time period.
abstract long	getLastMillisecond(Calendar calendar) Returns the last millisecond of the time period, evaluated using the supplied calendar (which incorporates a timezone).
long	getMiddleMillisecond() Returns the millisecond closest to the middle of the time period.
long	getMiddleMillisecond(Calendar calendar) Returns the millisecond closest to the middle of the time period, evaluated using the supplied calendar (which incorporates a timezone).
long	getMillisecond(TimePeriodAnchor anchor, Calendar calendar) Returns the millisecond (relative to the epoch) corresponding to the specified anchor using the supplied calendar (which incorporates a time zone).
abstract long	getSerialIndex() Returns a serial index number for the time unit.
Date	getStart() Returns the date/time that marks the start of the time period.
abstract RegularTimePeriod	next() Returns the time period following this one, or null if some limit has been reached.
abstract void	peg(Calendar calendar) Recalculates the start date/time and end date/time for this time period relative to the supplied calendar (which incorporates a time zone).
abstract RegularTimePeriod	previous() Returns the time period preceding this one, or null if some lower limit has been reached.
String	toString() Returns a string representation of the time period.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Comparable

compareTo

Constructor Detail

RegularTimePeriod

public RegularTimePeriod()

Method Detail

createInstance

public static RegularTimePeriod createInstance(Class c,
                                               Date millisecond,
                                               TimeZone zone,
                                               Locale locale)

Creates a time period that includes the specified millisecond, assuming the given time zone.

Parameters:

c - the time period class.

millisecond - the time.

zone - the time zone.

locale - the locale.

Returns:

The time period.

downsize

public static Class downsize(Class c)

Returns a subclass of RegularTimePeriod that is smaller than the specified class.

Parameters:

c - a subclass of RegularTimePeriod.

Returns:

A class.

previous

public abstract RegularTimePeriod previous()

Returns the time period preceding this one, or null if some lower limit has been reached.

Returns:

The previous time period (possibly null).

next

public abstract RegularTimePeriod next()

Returns the time period following this one, or null if some limit has been reached.

Returns:

The next time period (possibly null).

getSerialIndex

public abstract long getSerialIndex()

Returns a serial index number for the time unit.

Returns:

The serial index number.

peg

public abstract void peg(Calendar calendar)

Recalculates the start date/time and end date/time for this time period relative to the supplied calendar (which incorporates a time zone).

Parameters:

calendar - the calendar (null not permitted).

Since:

1.0.3

getStart

public Date getStart()

Returns the date/time that marks the start of the time period. This method returns a new Date instance every time it is called.

Specified by:

getStart in interface TimePeriod

Returns:

The start date/time.

See Also:

getFirstMillisecond()

getEnd

public Date getEnd()

Returns the date/time that marks the end of the time period. This method returns a new Date instance every time it is called.

Specified by:

getEnd in interface TimePeriod

Returns:

The end date/time.

See Also:

getLastMillisecond()

getFirstMillisecond

public abstract long getFirstMillisecond()

Returns the first millisecond of the time period. This will be determined relative to the time zone specified in the constructor, or in the calendar instance passed in the most recent call to the peg(Calendar) method.

Returns:

The first millisecond of the time period.

See Also:

getLastMillisecond()

getFirstMillisecond

public abstract long getFirstMillisecond(Calendar calendar)

Returns the first millisecond of the time period, evaluated using the supplied calendar (which incorporates a timezone).

Parameters:

calendar - the calendar (null not permitted).

Returns:

The first millisecond of the time period.

Throws:

NullPointerException - if calendar is null.

See Also:

getLastMillisecond(Calendar)

getLastMillisecond

public abstract long getLastMillisecond()

Returns the last millisecond of the time period. This will be determined relative to the time zone specified in the constructor, or in the calendar instance passed in the most recent call to the peg(Calendar) method.

Returns:

The last millisecond of the time period.

See Also:

getFirstMillisecond()

getLastMillisecond

public abstract long getLastMillisecond(Calendar calendar)

Returns the last millisecond of the time period, evaluated using the supplied calendar (which incorporates a timezone).

Parameters:

calendar - the calendar (null not permitted).

Returns:

The last millisecond of the time period.

See Also:

getFirstMillisecond(Calendar)

getMiddleMillisecond

public long getMiddleMillisecond()

Returns the millisecond closest to the middle of the time period.

Returns:

The middle millisecond.

getMiddleMillisecond

public long getMiddleMillisecond(Calendar calendar)

Returns the millisecond closest to the middle of the time period, evaluated using the supplied calendar (which incorporates a timezone).

Parameters:

calendar - the calendar.

Returns:

The middle millisecond.

getMillisecond

public long getMillisecond(TimePeriodAnchor anchor,
                           Calendar calendar)

Returns the millisecond (relative to the epoch) corresponding to the specified anchor using the supplied calendar (which incorporates a time zone).

Parameters:

anchor - the anchor (null not permitted).

calendar - the calendar (null not permitted).

Returns:

Milliseconds since the epoch.

Since:

1.0.18

toString

public String toString()

Returns a string representation of the time period.

Overrides:

toString in class Object

Returns:

The string.