brewman/overlord/src/app/purchase-return/purchase-return-resolver.service.ts

import {Injectable} from '@angular/core';
import {ActivatedRouteSnapshot, Resolve, RouterStateSnapshot} from '@angular/router';
import {Observable} from 'rxjs/internal/Observable';
import {Voucher} from '../core/voucher';
import {VoucherService} from '../core/voucher.service';

@Injectable({
  providedIn: 'root'
})
export class PurchaseReturnResolver implements Resolve<Voucher> {

  constructor(private ser: VoucherService) {
  }

  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<Voucher> {
    const id = route.paramMap.get('id');
    if (id === null) {
      return this.ser.getOfType('Purchase Return');
    } else {
      return this.ser.get(id, 'Purchase Return');
    }
  }
}