+/*-
+ * ========================LICENSE_START=================================
+ * O-RAN-SC
+ * %%
+ * Copyright (C) 2019 AT&T Intellectual Property and Nokia
+ * %%
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ========================LICENSE_END===================================
+ */
+
+import { CollectionViewer, DataSource } from '@angular/cdk/collections';
+import { MatSort } from '@angular/material';
+import { merge } from 'rxjs';
+import { BehaviorSubject } from 'rxjs/BehaviorSubject';
+import { Observable } from 'rxjs/Observable';
+import { of } from 'rxjs/observable/of';
+import { catchError, finalize, map } from 'rxjs/operators';
+import { DashboardUser } from '../interfaces/dashboard.types';
+import { DashboardService } from '../services/dashboard/dashboard.service';
+
+export class UserDataSource extends DataSource<DashboardUser> {
+
+ private usersSubject = new BehaviorSubject<DashboardUser[]>([]);
+
+ private loadingSubject = new BehaviorSubject<boolean>(false);
+
+ public loading$ = this.loadingSubject.asObservable();
+
+ constructor(private dashboardSvc: DashboardService, private sort: MatSort) {
+ super();
+ };
+
+ loadTable() {
+ this.loadingSubject.next(true);
+ this.dashboardSvc.getUsers()
+ .pipe(
+ catchError(() => of([])),
+ finalize(() => this.loadingSubject.next(false))
+ )
+ .subscribe(Users => this.usersSubject.next(Users))
+ }
+
+ connect(collectionViewer: CollectionViewer): Observable<DashboardUser[]> {
+ const dataMutations = [
+ this.usersSubject.asObservable(),
+ this.sort.sortChange
+ ];
+ return merge(...dataMutations).pipe(map(() => {
+ return this.getSortedData([...this.usersSubject.getValue()]);
+ }));
+ }
+
+ disconnect(collectionViewer: CollectionViewer): void {
+ this.usersSubject.complete();
+ this.loadingSubject.complete();
+ }
+
+ private getSortedData(data: DashboardUser[]) {
+ if (!this.sort.active || this.sort.direction === '') {
+ return data;
+ }
+
+ return data.sort((a: DashboardUser, b: DashboardUser) => {
+ const isAsc = this.sort.direction === 'asc';
+ switch (this.sort.active) {
+ case 'id': return compare(a.id, b.id, isAsc);
+ case 'firstName': return compare(a.firstName, b.firstName, isAsc);
+ case 'lastName': return compare(a.lastName, b.lastName, isAsc);
+ case 'status': return compare(a.status, b.status, isAsc);
+ default: return 0;
+ }
+ });
+ }
+}
+
+function compare(a, b, isAsc: boolean) {
+ return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
+}