Module org.holiday.calendar.western

Package org.holiday.calendar.observance.christian

Class OrthodoxEaster

java.lang.Object

org.holiday.calendar.observance.AbstractObservance

org.holiday.calendar.observance.christian.OrthodoxEaster

All Implemented Interfaces:

Function<Integer,LocalDate>, Predicate<Integer>, Observance, EasterObservance

public class OrthodoxEaster
extends AbstractObservance
implements EasterObservance

Observance of Orthodox Easter as recognized by the Orthodox church. This class implements the algorithm for Easter calculation as published by Carl Friedrich Gauss.

Due to the evolution of the computation of Easter Sunday during the early-to-medieval period of the Christian church, this implementation of the Gauss algorithm is only valid for years 530 - 3399 AD.

Author:

Dave Joyce

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_VALID_YEAR
static final int	MIN_VALID_YEAR
protected static final int[][]	YEAR_RANGE_ADJUSTMENT_MATRIX

Constructor Summary

Constructors

Constructor	Description
OrthodoxEaster()

Method Summary

Modifier and Type	Method	Description
protected LocalDate	computeDate(int year)	Compute the date for this observance in the given year.
protected boolean	isValidYear(int year)	Determine whether this observance applies in the given year.

Methods inherited from class org.holiday.calendar.observance.AbstractObservance

apply, test

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, apply, compose

Methods inherited from interface org.holiday.calendar.function.Observance

test

Methods inherited from interface java.util.function.Predicate

and, negate, or

Field Details

MIN_VALID_YEAR

public static final int MIN_VALID_YEAR

See Also:

• Constant Field Values

MAX_VALID_YEAR

public static final int MAX_VALID_YEAR

See Also:

• Constant Field Values

YEAR_RANGE_ADJUSTMENT_MATRIX

protected static final int[][] YEAR_RANGE_ADJUSTMENT_MATRIX

Constructor Details

OrthodoxEaster

public OrthodoxEaster()

Method Details

computeDate

protected LocalDate computeDate(int year)

Description copied from class: AbstractObservance

Compute the date for this observance in the given year. Only called when AbstractObservance.isValidYear(int) returns true.

Specified by:

computeDate in class AbstractObservance

Parameters:

year - the year for which to compute the date

Returns:

computed holiday date

isValidYear

protected boolean isValidYear(int year)

Description copied from class: AbstractObservance

Determine whether this observance applies in the given year. Defaults to true (all years are valid).

Overrides:

isValidYear in class AbstractObservance

Parameters:

year - the year to test

Returns:

true if this observance applies