Module org.holiday.calendar.core

Package org.holiday.calendar.observance

package org.holiday.calendar.observance
Base classes for Observance implementations, used throughout the regional calendar modules.

AbstractObservance supplies standard null-guard handling and a year-validity hook, leaving subclasses to implement only computeDate(int): 


 public class Juneteenth extends AbstractObservance {
     protected LocalDate computeDate(int year) {
         return LocalDate.of(year, Month.JUNE, 19);
     }
     protected boolean isValidYear(int year) {
         return year >= 2021;
     }
 }

CompositeObservance extends AbstractObservance for holidays computed relative to another observance (most commonly an Easter algorithm), delegating year validity to that base observance — see the observance.christian package in the western module for examples such as Good Friday and Easter Monday.

Author:
Dave Joyce