org.jfree.date
Class SerialDate

java.lang.Object
  org.jfree.date.SerialDate

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable, MonthConstants

Direct Known Subclasses:

SpreadsheetDate

public abstract class SerialDate
extends java.lang.Object
implements java.lang.Comparable, java.io.Serializable, MonthConstants

An abstract class that defines our requirements for manipulating dates, without tying down a particular implementation.

Requirement 1 : match at least what Excel does for dates; Requirement 2 : the date represented by the class is immutable;

Why not just use java.util.Date? We will, when it makes sense. At times, java.util.Date can be *too* precise - it represents an instant in time, accurate to 1/1000th of a second (with the date itself depending on the time-zone). Sometimes we just want to represent a particular day (e.g. 21 January 2015) without concerning ourselves about the time of day, or the time-zone, or anything else. That's what we've defined SerialDate for.

You can call getInstance() to get a concrete subclass of SerialDate, without worrying about the exact implementation.

Author:

David Gilbert

See Also:

Serialized Form

Field Summary

static java.text.DateFormatSymbols	DATE_FORMAT_SYMBOLS Date format symbols.
static int	FIRST_WEEK_IN_MONTH A useful constant for referring to the first week in a month.
static int	FOLLOWING Useful constant for specifying a day of the week relative to a fixed date.
static int	FOURTH_WEEK_IN_MONTH A useful constant for referring to the fourth week in a month.
static int	FRIDAY Useful constant for Friday.
static int	INCLUDE_BOTH Useful range constant.
static int	INCLUDE_FIRST Useful range constant.
static int	INCLUDE_NONE Useful range constant.
static int	INCLUDE_SECOND Useful range constant.
static int	LAST_WEEK_IN_MONTH A useful constant for referring to the last week in a month.
static int	MAXIMUM_YEAR_SUPPORTED The highest year value supported by this date format.
static int	MINIMUM_YEAR_SUPPORTED The lowest year value supported by this date format.
static int	MONDAY Useful constant for Monday.
static int	NEAREST Useful constant for specifying a day of the week relative to a fixed date.
static int	PRECEDING Useful constant for specifying a day of the week relative to a fixed date.
static int	SATURDAY Useful constant for Saturday.
static int	SECOND_WEEK_IN_MONTH A useful constant for referring to the second week in a month.
static int	SERIAL_LOWER_BOUND The serial number for 1 January 1900.
static int	SERIAL_UPPER_BOUND The serial number for 31 December 9999.
static int	SUNDAY Useful constant for Sunday.
static int	THIRD_WEEK_IN_MONTH A useful constant for referring to the third week in a month.
static int	THURSDAY Useful constant for Thrusday.
static int	TUESDAY Useful constant for Tuesday.
static int	WEDNESDAY Useful constant for Wednesday.

Fields inherited from interface org.jfree.date.MonthConstants

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

Constructor Summary

protected

SerialDate() Default constructor.

Method Summary

static SerialDate	addDays(int days, SerialDate base) Creates a new date by adding the specified number of days to the base date.
static SerialDate	addMonths(int months, SerialDate base) Creates a new date by adding the specified number of months to the base date.
static SerialDate	addYears(int years, SerialDate base) Creates a new date by adding the specified number of years to the base date.
abstract int	compare(SerialDate other) Returns the difference (in days) between this date and the specified 'other' date.
static SerialDate	createInstance(java.util.Date date) Factory method that returns an instance of a subclass of SerialDate.
static SerialDate	createInstance(int serial) Factory method that returns an instance of some concrete subclass of SerialDate.
static SerialDate	createInstance(int day, int month, int yyyy) Factory method that returns an instance of some concrete subclass of SerialDate.
abstract int	getDayOfMonth() Returns the day of the month.
abstract int	getDayOfWeek() Returns the day of the week.
java.lang.String	getDescription() Returns the description that is attached to the date.
SerialDate	getEndOfCurrentMonth(SerialDate base) Rolls the date forward to the last day of the month.
SerialDate	getFollowingDayOfWeek(int targetDOW) Returns the earliest date that falls on the specified day-of-the-week and is AFTER this date.
static SerialDate	getFollowingDayOfWeek(int targetWeekday, SerialDate base) Returns the earliest date that falls on the specified day-of-the-week and is AFTER the base date.
abstract int	getMonth() Returns the month (January = 1, February = 2, March = 3).
static java.lang.String[]	getMonths() Returns an array of month names.
static java.lang.String[]	getMonths(boolean shortened) Returns an array of month names.
SerialDate	getNearestDayOfWeek(int targetDOW) Returns the nearest date that falls on the specified day-of-the-week.
static SerialDate	getNearestDayOfWeek(int targetDOW, SerialDate base) Returns the date that falls on the specified day-of-the-week and is CLOSEST to the base date.
SerialDate	getPreviousDayOfWeek(int targetDOW) Returns the latest date that falls on the specified day-of-the-week and is BEFORE this date.
static SerialDate	getPreviousDayOfWeek(int targetWeekday, SerialDate base) Returns the latest date that falls on the specified day-of-the-week and is BEFORE the base date.
abstract int	getYYYY() Returns the year (assume a valid range of 1900 to 9999).
abstract boolean	isAfter(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
abstract boolean	isBefore(SerialDate other) Returns true if this SerialDate represents an earlier date compared to the specified SerialDate.
abstract boolean	isInRange(SerialDate d1, SerialDate d2) Returns true if this SerialDate is within the specified range (INCLUSIVE).
abstract boolean	isInRange(SerialDate d1, SerialDate d2, int include) Returns true if this SerialDate is within the specified range (caller specifies whether or not the end-points are included).
static boolean	isLeapYear(int yyyy) Determines whether or not the specified year is a leap year.
abstract boolean	isOn(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
abstract boolean	isOnOrAfter(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
abstract boolean	isOnOrBefore(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
static boolean	isValidMonthCode(int code) Returns true if the supplied integer code represents a valid month.
static boolean	isValidWeekdayCode(int code) Returns true if the supplied integer code represents a valid day-of-the-week, and false otherwise.
static boolean	isValidWeekInMonthCode(int code) Returns true if the supplied integer code represents a valid week-in-the-month, and false otherwise.
static int	lastDayOfMonth(int month, int yyyy) Returns the number of the last day of the month, taking into account leap years.
static int	leapYearCount(int yyyy) Returns the number of leap years from 1900 to the specified year INCLUSIVE.
static int	monthCodeToQuarter(int code) Returns the quarter for the specified month.
static java.lang.String	monthCodeToString(int month) Returns a string representing the supplied month.
static java.lang.String	monthCodeToString(int month, boolean shortened) Returns a string representing the supplied month.
static java.lang.String	relativeToString(int relative) Returns a string representing the supplied 'relative'.
void	setDescription(java.lang.String description) Sets the description for the date.
static int	stringToMonthCode(java.lang.String s) Converts a string to a month code.
static int	stringToWeekdayCode(java.lang.String s) Converts the supplied string to a day of the week.
abstract java.util.Date	toDate() Returns a java.util.Date.
abstract int	toSerial() Returns the serial number for the date, where 1 January 1900 = 2 (this corresponds, almost, to the numbering system used in Microsoft Excel for Windows and Lotus 1-2-3).
java.lang.String	toString() Converts the date to a string.
static java.lang.String	weekdayCodeToString(int weekday) Returns a string representing the supplied day-of-the-week.
static java.lang.String	weekInMonthToString(int count) Returns a string corresponding to the week-in-the-month code.

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

Field Detail

DATE_FORMAT_SYMBOLS

public static final java.text.DateFormatSymbols DATE_FORMAT_SYMBOLS

Date format symbols.

SERIAL_LOWER_BOUND

public static final int SERIAL_LOWER_BOUND

The serial number for 1 January 1900.

See Also:

Constant Field Values

SERIAL_UPPER_BOUND

public static final int SERIAL_UPPER_BOUND

The serial number for 31 December 9999.

See Also:

Constant Field Values

MINIMUM_YEAR_SUPPORTED

public static final int MINIMUM_YEAR_SUPPORTED

The lowest year value supported by this date format.

See Also:

Constant Field Values

MAXIMUM_YEAR_SUPPORTED

public static final int MAXIMUM_YEAR_SUPPORTED

The highest year value supported by this date format.

See Also:

Constant Field Values

MONDAY

public static final int MONDAY

Useful constant for Monday. Equivalent to java.util.Calendar.MONDAY.

See Also:

Constant Field Values

TUESDAY

public static final int TUESDAY

Useful constant for Tuesday. Equivalent to java.util.Calendar.TUESDAY.

See Also:

Constant Field Values

WEDNESDAY

public static final int WEDNESDAY

Useful constant for Wednesday. Equivalent to java.util.Calendar.WEDNESDAY.

See Also:

Constant Field Values

THURSDAY

public static final int THURSDAY

Useful constant for Thrusday. Equivalent to java.util.Calendar.THURSDAY.

See Also:

Constant Field Values

FRIDAY

public static final int FRIDAY

Useful constant for Friday. Equivalent to java.util.Calendar.FRIDAY.

See Also:

Constant Field Values

SATURDAY

public static final int SATURDAY

Useful constant for Saturday. Equivalent to java.util.Calendar.SATURDAY.

See Also:

Constant Field Values

SUNDAY

public static final int SUNDAY

Useful constant for Sunday. Equivalent to java.util.Calendar.SUNDAY.

See Also:

Constant Field Values

FIRST_WEEK_IN_MONTH

public static final int FIRST_WEEK_IN_MONTH

A useful constant for referring to the first week in a month.

See Also:

Constant Field Values

SECOND_WEEK_IN_MONTH

public static final int SECOND_WEEK_IN_MONTH

A useful constant for referring to the second week in a month.

See Also:

Constant Field Values

THIRD_WEEK_IN_MONTH

public static final int THIRD_WEEK_IN_MONTH

A useful constant for referring to the third week in a month.

See Also:

Constant Field Values

FOURTH_WEEK_IN_MONTH

public static final int FOURTH_WEEK_IN_MONTH

A useful constant for referring to the fourth week in a month.

See Also:

Constant Field Values

LAST_WEEK_IN_MONTH

public static final int LAST_WEEK_IN_MONTH

A useful constant for referring to the last week in a month.

See Also:

Constant Field Values

INCLUDE_NONE

public static final int INCLUDE_NONE

Useful range constant.

See Also:

Constant Field Values

INCLUDE_FIRST

public static final int INCLUDE_FIRST

Useful range constant.

See Also:

Constant Field Values

INCLUDE_SECOND

public static final int INCLUDE_SECOND

Useful range constant.

See Also:

Constant Field Values

INCLUDE_BOTH

public static final int INCLUDE_BOTH

Useful range constant.

See Also:

Constant Field Values

PRECEDING

public static final int PRECEDING

Useful constant for specifying a day of the week relative to a fixed date.

See Also:

Constant Field Values

NEAREST

public static final int NEAREST

Useful constant for specifying a day of the week relative to a fixed date.

See Also:

Constant Field Values

FOLLOWING

public static final int FOLLOWING

Useful constant for specifying a day of the week relative to a fixed date.

See Also:

Constant Field Values

Constructor Detail

SerialDate

protected SerialDate()

Default constructor.

Method Detail

isValidWeekdayCode

public static boolean isValidWeekdayCode(int code)

Returns true if the supplied integer code represents a valid day-of-the-week, and false otherwise.

Parameters:

code - the code being checked for validity.

Returns:

true if the supplied integer code represents a valid day-of-the-week, and false otherwise.

stringToWeekdayCode

public static int stringToWeekdayCode(java.lang.String s)

Converts the supplied string to a day of the week.

Parameters:

s - a string representing the day of the week.

Returns:

-1 if the string is not convertable, the day of the week otherwise.

weekdayCodeToString

public static java.lang.String weekdayCodeToString(int weekday)

Returns a string representing the supplied day-of-the-week.

Need to find a better approach.

Parameters:

weekday - the day of the week.

Returns:

a string representing the supplied day-of-the-week.

getMonths

public static java.lang.String[] getMonths()

Returns an array of month names.

Returns:

an array of month names.

getMonths

public static java.lang.String[] getMonths(boolean shortened)

Returns an array of month names.

Parameters:

shortened - a flag indicating that shortened month names should be returned.

Returns:

an array of month names.

isValidMonthCode

public static boolean isValidMonthCode(int code)

Returns true if the supplied integer code represents a valid month.

Parameters:

code - the code being checked for validity.

Returns:

true if the supplied integer code represents a valid month.

monthCodeToQuarter

public static int monthCodeToQuarter(int code)

Returns the quarter for the specified month.

Parameters:

code - the month code (1-12).

Returns:

the quarter that the month belongs to.

monthCodeToString

public static java.lang.String monthCodeToString(int month)

Returns a string representing the supplied month.

The string returned is the long form of the month name taken from the default locale.

Parameters:

month - the month.

Returns:

a string representing the supplied month.

monthCodeToString

public static java.lang.String monthCodeToString(int month,
                                                 boolean shortened)

Returns a string representing the supplied month.

The string returned is the long or short form of the month name taken from the default locale.

Parameters:

month - the month.

shortened - if true return the abbreviation of the month.

Returns:

a string representing the supplied month.

stringToMonthCode

public static int stringToMonthCode(java.lang.String s)

Converts a string to a month code.

This method will return one of the constants JANUARY, FEBRUARY, ..., DECEMBER that corresponds to the string. If the string is not recognised, this method returns -1.

Parameters:

s - the string to parse.

Returns:

-1 if the string is not parseable, the month of the year otherwise.

isValidWeekInMonthCode

public static boolean isValidWeekInMonthCode(int code)

Returns true if the supplied integer code represents a valid week-in-the-month, and false otherwise.

Parameters:

code - the code being checked for validity.

Returns:

true if the supplied integer code represents a valid week-in-the-month.

isLeapYear

public static boolean isLeapYear(int yyyy)

Determines whether or not the specified year is a leap year.

Parameters:

yyyy - the year (in the range 1900 to 9999).

Returns:

true if the specified year is a leap year.

leapYearCount

public static int leapYearCount(int yyyy)

Returns the number of leap years from 1900 to the specified year INCLUSIVE.

Note that 1900 is not a leap year.

Parameters:

yyyy - the year (in the range 1900 to 9999).

Returns:

the number of leap years from 1900 to the specified year.

lastDayOfMonth

public static int lastDayOfMonth(int month,
                                 int yyyy)

Returns the number of the last day of the month, taking into account leap years.

Parameters:

month - the month.

yyyy - the year (in the range 1900 to 9999).

Returns:

the number of the last day of the month.

addDays

public static SerialDate addDays(int days,
                                 SerialDate base)

Creates a new date by adding the specified number of days to the base date.

Parameters:

days - the number of days to add (can be negative).

base - the base date.

Returns:

a new date.

addMonths

public static SerialDate addMonths(int months,
                                   SerialDate base)

Creates a new date by adding the specified number of months to the base date.

If the base date is close to the end of the month, the day on the result may be adjusted slightly: 31 May + 1 month = 30 June.

Parameters:

months - the number of months to add (can be negative).

base - the base date.

Returns:

a new date.

addYears

public static SerialDate addYears(int years,
                                  SerialDate base)

Creates a new date by adding the specified number of years to the base date.

Parameters:

years - the number of years to add (can be negative).

base - the base date.

Returns:

A new date.

getPreviousDayOfWeek

public static SerialDate getPreviousDayOfWeek(int targetWeekday,
                                              SerialDate base)

Returns the latest date that falls on the specified day-of-the-week and is BEFORE the base date.

Parameters:

targetWeekday - a code for the target day-of-the-week.

base - the base date.

Returns:

the latest date that falls on the specified day-of-the-week and is BEFORE the base date.

getFollowingDayOfWeek

public static SerialDate getFollowingDayOfWeek(int targetWeekday,
                                               SerialDate base)

Returns the earliest date that falls on the specified day-of-the-week and is AFTER the base date.

Parameters:

targetWeekday - a code for the target day-of-the-week.

base - the base date.

Returns:

the earliest date that falls on the specified day-of-the-week and is AFTER the base date.

getNearestDayOfWeek

public static SerialDate getNearestDayOfWeek(int targetDOW,
                                             SerialDate base)

Returns the date that falls on the specified day-of-the-week and is CLOSEST to the base date.

Parameters:

targetDOW - a code for the target day-of-the-week.

base - the base date.

Returns:

the date that falls on the specified day-of-the-week and is CLOSEST to the base date.

getEndOfCurrentMonth

public SerialDate getEndOfCurrentMonth(SerialDate base)

Rolls the date forward to the last day of the month.

Parameters:

base - the base date.

Returns:

a new serial date.

weekInMonthToString

public static java.lang.String weekInMonthToString(int count)

Returns a string corresponding to the week-in-the-month code.

Need to find a better approach.

Parameters:

count - an integer code representing the week-in-the-month.

Returns:

a string corresponding to the week-in-the-month code.

relativeToString

public static java.lang.String relativeToString(int relative)

Returns a string representing the supplied 'relative'.

Need to find a better approach.

Parameters:

relative - a constant representing the 'relative'.

Returns:

a string representing the supplied 'relative'.

createInstance

public static SerialDate createInstance(int day,
                                        int month,
                                        int yyyy)

Factory method that returns an instance of some concrete subclass of SerialDate.

Parameters:

day - the day (1-31).

month - the month (1-12).

yyyy - the year (in the range 1900 to 9999).

Returns:

An instance of SerialDate.

createInstance

public static SerialDate createInstance(int serial)

Factory method that returns an instance of some concrete subclass of SerialDate.

Parameters:

serial - the serial number for the day (1 January 1900 = 2).

Returns:

a instance of SerialDate.

createInstance

public static SerialDate createInstance(java.util.Date date)

Factory method that returns an instance of a subclass of SerialDate.

Parameters:

date - A Java date object.

Returns:

a instance of SerialDate.

toSerial

public abstract int toSerial()

Returns the serial number for the date, where 1 January 1900 = 2 (this corresponds, almost, to the numbering system used in Microsoft Excel for Windows and Lotus 1-2-3).

Returns:

the serial number for the date.

toDate

public abstract java.util.Date toDate()

Returns a java.util.Date. Since java.util.Date has more precision than SerialDate, we need to define a convention for the 'time of day'.

Returns:

this as java.util.Date.

getDescription

public java.lang.String getDescription()

Returns the description that is attached to the date. It is not required that a date have a description, but for some applications it is useful.

Returns:

The description (possibly null).

setDescription

public void setDescription(java.lang.String description)

Sets the description for the date.

Parameters:

description - the description for this date (null permitted).

toString

public java.lang.String toString()

Converts the date to a string.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of the date.

getYYYY

public abstract int getYYYY()

Returns the year (assume a valid range of 1900 to 9999).

Returns:

the year.

getMonth

public abstract int getMonth()

Returns the month (January = 1, February = 2, March = 3).

Returns:

the month of the year.

getDayOfMonth

public abstract int getDayOfMonth()

Returns the day of the month.

Returns:

the day of the month.

getDayOfWeek

public abstract int getDayOfWeek()

Returns the day of the week.

Returns:

the day of the week.

compare

public abstract int compare(SerialDate other)

Returns the difference (in days) between this date and the specified 'other' date.

The result is positive if this date is after the 'other' date and negative if it is before the 'other' date.

Parameters:

other - the date being compared to.

Returns:

the difference between this and the other date.

isOn

public abstract boolean isOn(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isBefore

public abstract boolean isBefore(SerialDate other)

Returns true if this SerialDate represents an earlier date compared to the specified SerialDate.

Parameters:

other - The date being compared to.

Returns:

true if this SerialDate represents an earlier date compared to the specified SerialDate.

isOnOrBefore

public abstract boolean isOnOrBefore(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isAfter

public abstract boolean isAfter(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isOnOrAfter

public abstract boolean isOnOrAfter(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isInRange

public abstract boolean isInRange(SerialDate d1,
                                  SerialDate d2)

Returns true if this SerialDate is within the specified range (INCLUSIVE). The date order of d1 and d2 is not important.

Parameters:

d1 - a boundary date for the range.

d2 - the other boundary date for the range.

Returns:

A boolean.

isInRange

public abstract boolean isInRange(SerialDate d1,
                                  SerialDate d2,
                                  int include)

Returns true if this SerialDate is within the specified range (caller specifies whether or not the end-points are included). The date order of d1 and d2 is not important.

Parameters:

d1 - a boundary date for the range.

d2 - the other boundary date for the range.

include - a code that controls whether or not the start and end dates are included in the range.

Returns:

A boolean.

getPreviousDayOfWeek

public SerialDate getPreviousDayOfWeek(int targetDOW)

Returns the latest date that falls on the specified day-of-the-week and is BEFORE this date.

Parameters:

targetDOW - a code for the target day-of-the-week.

Returns:

the latest date that falls on the specified day-of-the-week and is BEFORE this date.

getFollowingDayOfWeek

public SerialDate getFollowingDayOfWeek(int targetDOW)

Returns the earliest date that falls on the specified day-of-the-week and is AFTER this date.

Parameters:

targetDOW - a code for the target day-of-the-week.

Returns:

the earliest date that falls on the specified day-of-the-week and is AFTER this date.

getNearestDayOfWeek

public SerialDate getNearestDayOfWeek(int targetDOW)

Returns the nearest date that falls on the specified day-of-the-week.

Parameters:

targetDOW - a code for the target day-of-the-week.

Returns:

the nearest date that falls on the specified day-of-the-week.