import Singleton from "../patterns/Singleton";

export abstract class ApplicationResolver {
    protected constructor() {
        resolverProvider.addResolver(this);
    }
}

class GlobalResolverProvider extends Singleton{
    private resolvers:ApplicationResolver[] = [];

    public addResolver(resolver:ApplicationResolver){
        this.resolvers.push(resolver);
    }

    public getResolver<T extends ApplicationResolver>(args: new () => T):ApplicationResolver[]|undefined{
        let ret:ApplicationResolver[] = [];
        this.resolvers.forEach(rs=>{
            if (rs.constructor == args) {
                ret.push(rs);
            }
        });
        return ret;
    }
}

export const resolverProvider:GlobalResolverProvider = GlobalResolverProvider.getInstance();