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75 lines
2.6 KiB
75 lines
2.6 KiB
import {
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AbstractFactory,
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Container,
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DependencyRequirement,
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PropertyDependency,
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isInstantiable,
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DEPENDENCY_KEYS_METADATA_KEY,
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DEPENDENCY_KEYS_PROPERTY_METADATA_KEY
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} from "@extollo/di"
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import {Collection, ErrorWithContext} from "@extollo/util"
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import {Logging} from "../service/Logging";
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import {Config} from "../service/Config";
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import {ViewEngine} from "./ViewEngine";
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import {PugViewEngine} from "./PugViewEngine";
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/**
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* Dependency factory whose token matches the abstract ViewEngine class, but produces
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* a particular ViewEngine implementation based on the configuration.
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*/
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export class ViewEngineFactory extends AbstractFactory {
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protected readonly logging: Logging
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protected readonly config: Config
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constructor() {
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super({})
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this.logging = Container.getContainer().make<Logging>(Logging)
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this.config = Container.getContainer().make<Config>(Config)
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}
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produce(dependencies: any[], parameters: any[]): ViewEngine {
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return new (this.getViewEngineClass())
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}
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match(something: any) {
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return something === ViewEngine
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}
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getDependencyKeys(): Collection<DependencyRequirement> {
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const meta = Reflect.getMetadata(DEPENDENCY_KEYS_METADATA_KEY, this.getViewEngineClass())
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if ( meta ) return meta
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return new Collection<DependencyRequirement>()
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}
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getInjectedProperties(): Collection<PropertyDependency> {
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const meta = new Collection<PropertyDependency>()
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let currentToken = this.getViewEngineClass()
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do {
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const loadedMeta = Reflect.getMetadata(DEPENDENCY_KEYS_PROPERTY_METADATA_KEY, currentToken)
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if ( loadedMeta ) meta.concat(loadedMeta)
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currentToken = Object.getPrototypeOf(currentToken)
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} while (Object.getPrototypeOf(currentToken) !== Function.prototype && Object.getPrototypeOf(currentToken) !== Object.prototype)
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return meta
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}
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/**
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* Using the config, get the implementation of the ViewEngine that should be used in the application.
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* @protected
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*/
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protected getViewEngineClass() {
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const ViewEngineClass = this.config.get('server.view_engine.driver', PugViewEngine)
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if ( !isInstantiable(ViewEngineClass) || !(ViewEngineClass.prototype instanceof ViewEngine) ) {
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const e = new ErrorWithContext('Provided session class does not extend from @extollo/lib.ViewEngine');
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e.context = {
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config_key: 'server.view_engine.driver',
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class: ViewEngineClass.toString(),
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}
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}
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return ViewEngineClass
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}
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}
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