2 * ========================LICENSE_START=================================
5 * Copyright (C) 2019 AT&T Intellectual Property and Nokia
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ========================LICENSE_END===================================
21 import { CollectionViewer, DataSource } from '@angular/cdk/collections';
22 import { MatSort } from '@angular/material';
23 import { merge } from 'rxjs';
24 import { BehaviorSubject } from 'rxjs/BehaviorSubject';
25 import { Observable } from 'rxjs/Observable';
26 import { of } from 'rxjs/observable/of';
27 import { catchError, finalize, map } from 'rxjs/operators';
28 import { DashboardUser } from '../interfaces/dashboard.types';
29 import { DashboardService } from '../services/dashboard/dashboard.service';
31 export class UserDataSource extends DataSource<DashboardUser> {
33 private usersSubject = new BehaviorSubject<DashboardUser[]>([]);
35 private loadingSubject = new BehaviorSubject<boolean>(false);
37 public loading$ = this.loadingSubject.asObservable();
39 constructor(private dashboardSvc: DashboardService, private sort: MatSort) {
44 this.loadingSubject.next(true);
45 this.dashboardSvc.getUsers()
47 catchError(() => of([])),
48 finalize(() => this.loadingSubject.next(false))
50 .subscribe(Users => this.usersSubject.next(Users))
53 connect(collectionViewer: CollectionViewer): Observable<DashboardUser[]> {
54 const dataMutations = [
55 this.usersSubject.asObservable(),
58 return merge(...dataMutations).pipe(map(() => {
59 return this.getSortedData([...this.usersSubject.getValue()]);
63 disconnect(collectionViewer: CollectionViewer): void {
64 this.usersSubject.complete();
65 this.loadingSubject.complete();
68 private getSortedData(data: DashboardUser[]) {
69 if (!this.sort.active || this.sort.direction === '') {
73 return data.sort((a: DashboardUser, b: DashboardUser) => {
74 const isAsc = this.sort.direction === 'asc';
75 switch (this.sort.active) {
76 case 'id': return compare(a.id, b.id, isAsc);
77 case 'firstName': return compare(a.firstName, b.firstName, isAsc);
78 case 'lastName': return compare(a.lastName, b.lastName, isAsc);
79 case 'status': return compare(a.status, b.status, isAsc);
86 function compare(a, b, isAsc: boolean) {
87 return (a < b ? -1 : 1) * (isAsc ? 1 : -1);