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73 lines
2.0 KiB
73 lines
2.0 KiB
import {Canonical} from './Canonical'
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import {Singleton} from '../di'
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import {Maybe} from '../util'
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/**
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* Error throw when a duplicate canonical key is registered.
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* @extends Error
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*/
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export class DuplicateResolverKeyError extends Error {
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constructor(key: string) {
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super(`There is already a canonical unit with the scope ${key} registered.`)
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}
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}
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/**
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* Error throw when a key that isn't registered with the service.
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* @extends Error
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*/
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export class NoSuchCanonicalResolverKeyError extends Error {
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constructor(key: string) {
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super(`There is no such canonical unit with the scope ${key} registered.`)
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}
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}
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/**
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* Service used to access various canonical resources.
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*/
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@Singleton()
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export class Canon {
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/**
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* The resources registered with this service. Map of canonical service name
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* to canonical service instance.
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* @type object
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*/
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protected resources: { [key: string]: Canonical<any> } = {}
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/**
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* Get a canonical resource by its name key.
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* @param {string} key
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* @return Canonical
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*/
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resource<T>(key: string): Canonical<T> {
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if ( !this.resources[key] ) {
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throw new NoSuchCanonicalResolverKeyError(key)
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}
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return this.resources[key] as Canonical<T>
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}
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/**
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* Get a canonical item from a fully-qualified canonical name.
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* This is just a quality-of-life wrapper around `this.resource(...).get(...)`.
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* @param key
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*/
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getFromFullyQualified(key: string): Maybe<any> {
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const [namespace, ...parts] = key.split('::')
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const unqualified = parts.join('::')
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return this.resource(namespace).get(unqualified)
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}
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/**
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* Register a canonical resource.
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* @param {Canonical} unit
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*/
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registerCanonical(unit: Canonical<any>): void {
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const key = unit.canonicalItems
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if ( this.resources[key] ) {
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throw new DuplicateResolverKeyError(key)
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}
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this.resources[key] = unit
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}
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}
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