Module org.holiday.calendar.core

module org.holiday.calendar.core
Holiday Calendar core API module.

Provides the core abstractions for defining, building, and calculating holiday calendars: Holiday (and its permitted subtypes, including the EarlyCloseHoliday half-day close), HolidayCalendar, HolidayCalendarService, HolidayCalendarFactory, and the Observance/DateRoll functional interfaces used to plug in per-region date calculation and weekend-rolling behavior. Regional implementations (the western, apac, and mena modules) depend on this module and register their HolidayCalendarService providers via ServiceLoader.

Typical read-only usage — locate a calendar by code and calculate a year's holidays without depending on which module provides it: 


 HolidayCalendarFactory factory = new HolidayCalendarFactory();
 HolidayCalendar xnys = factory.create("XNYS");
 List<HolidayDate> holidays = xnys.calculate(2026);
 List<HolidayDate> earlyCloses = xnys.calculateEarlyCloses(2026);