net.time4j.history

Enum Computus

java.lang.Object

java.lang.Enum<Computus>

net.time4j.history.Computus

All Implemented Interfaces:

Serializable, Comparable<Computus>

public enum Computus
extends Enum<Computus>

Provides procedures how to determine Easter Sunday.

The algorithms are based on the work of Heiner Lichtenberg in 1997.

Since:

3.16/4.13

Author:

Meno Hochschild

Enum Constant Summary

Enum Constants

Enum Constant and Description
EASTERN Applies the Julian calendar and is used by Orthodox church in East Europe.
WESTERN Applies the Julian/Gregorian calendar and is used by catholic and protestantic churches.

Method Summary

Modifier and Type	Method and Description
PlainDate	easterSunday(int annoDomini) Calculates the date of Easter Sunday.
static Computus	valueOf(String name) Returns the enum constant of this type with the specified name.
static Computus[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

WESTERN

public static final Computus WESTERN

Applies the Julian/Gregorian calendar and is used by catholic and protestantic churches.

EASTERN

public static final Computus EASTERN

Applies the Julian calendar and is used by Orthodox church in East Europe.

Method Detail

values

public static Computus[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Computus c : Computus.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static Computus valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

easterSunday

public PlainDate easterSunday(int annoDomini)

Calculates the date of Easter Sunday.

Parameters:

annoDomini - calendar year related to era AD

Returns:

calendar date of Easter Sunday (ISO-8601)

Throws:

IllegalArgumentException - if given year is before AD 532 (the first table from Beda Venerabilis)

Since:

3.16/4.13