Standard libraries that lift up your code.
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1 year ago
import {Canonical} from "./Canonical";
import {Singleton} from "../di";
1 year ago
/**
* Error throw when a duplicate canonical key is registered.
* @extends Error
*/
export class DuplicateResolverKeyError extends Error {
constructor(key: string) {
super(`There is already a canonical unit with the scope ${key} registered.`)
}
}
/**
* Error throw when a key that isn't registered with the service.
* @extends Error
*/
export class NoSuchCanonicalResolverKeyError extends Error {
constructor(key: string) {
super(`There is no such canonical unit with the scope ${key} registered.`)
}
}
/**
* Service used to access various canonical resources.
*/
@Singleton()
export class Canon {
/**
* The resources registered with this service. Map of canonical service name
* to canonical service instance.
* @type object
*/
protected resources: { [key: string]: Canonical<any> } = {}
/**
* Get a canonical resource by its name key.
* @param {string} key
* @return Canonical
*/
resource<T>(key: string): Canonical<T> {
if ( !this.resources[key] ) throw new NoSuchCanonicalResolverKeyError(key)
return this.resources[key] as Canonical<T>
}
/**
* Register a canonical resource.
* @param {Canonical} unit
*/
registerCanonical(unit: Canonical<any>) {
const key = unit.canonicalItems
if ( this.resources[key] ) throw new DuplicateResolverKeyError(key)
this.resources[key] = unit
}
}