@appolo/inject/lib/methods/instances/_get.ts

dependency injection for node js

import {Injector} from "../../inject/inject";
import {_createObjectInstance} from "./_createObjectInstance";
import {IDefinition} from "../../interfaces/IDefinition";

export function _get<T>(this: Injector, objectID: string, runtimeArgs?: any[]): T {

    let instance = this._instances[objectID] as T;

    if (instance) {
        return instance;
    }

    let def = this._definitions[objectID];

    if (def) {
        return _getFromDefinition.call(this, def, objectID, runtimeArgs) as T
    }

    if (this.parent) {
        return this.parent.getObject(objectID, runtimeArgs);
    }

    throw new Error(`Injector:can't find object definition for objectID:${objectID}`);
}

export function _getFromDefinition<T>(this: Injector, def: IDefinition, objectID: string, runtimeArgs?: any[]): T {
    return def.injector && def.injector !== this
        ? def.injector.getObject(def.refName || objectID, runtimeArgs)
        : _createObjectInstance.call(this, objectID, def, runtimeArgs) as T;
}