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/*
* @copyright (c) 2016, Philipp Thürwächter & Pattrick Hüper
* @copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
* @license BSD-3-Clause (see LICENSE in the root directory of this source tree)
*/
import { ZoneId } from './ZoneId';
import { ZoneRulesProvider } from './zone/ZoneRulesProvider';
/**
* A geographical region where the same time-zone rules apply.
*
* Time-zone information is categorized as a set of rules defining when and
* how the offset from UTC/Greenwich changes. These rules are accessed using
* identifiers based on geographical regions, such as countries or states.
* The most common region classification is the Time Zone Database (TZDB),
* which defines regions such as 'Europe/Paris' and 'Asia/Tokyo'.
*
* The region identifier, modeled by this class, is distinct from the
* underlying rules, modeled by {@link ZoneRules}.
* The rules are defined by governments and change frequently.
* By contrast, the region identifier is well-defined and long-lived.
* This separation also allows rules to be shared between regions if appropriate.
*
* ### Specification for implementors
*
* This class is immutable and thread-safe.
*/
export class ZoneRegion extends ZoneId {
/**
* @param {string} zoneId
* @return {ZoneId}
*/
static ofId(zoneId){
const rules = ZoneRulesProvider.getRules(zoneId);
return new ZoneRegion(zoneId, rules);
}
//-------------------------------------------------------------------------
/**
* Constructor.
*
* @param {string} id the time-zone ID, not null
* @param {ZoneRules} rules the rules, null for lazy lookup
* @private
*/
constructor(id, rules) {
super();
this._id = id;
this._rules = rules;
}
//-----------------------------------------------------------------------
/**
*
* @returns {string}
*/
id() {
return this._id;
}
/**
*
* @returns {ZoneRules}
*/
rules() {
return this._rules;
}
}