2 * ========================LICENSE_START=================================
5 * Copyright (C) 2019 Nordix Foundation
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 { HttpErrorResponse } from '@angular/common/http';
23 import { MatSort } from '@angular/material';
24 import { Observable } from 'rxjs/Observable';
25 import { BehaviorSubject } from 'rxjs/BehaviorSubject';
26 import { merge } from 'rxjs';
27 import { of } from 'rxjs/observable/of';
28 import { catchError, finalize, map } from 'rxjs/operators';
29 import { PolicyType } from '../interfaces/policy.types';
30 import { PolicyService } from '../services/policy/policy.service';
31 import { NotificationService } from '../services/ui/notification.service';
33 export class PolicyTypeDataSource extends DataSource<PolicyType> {
35 private policyTypeSubject = new BehaviorSubject<PolicyType[]>([]);
37 private loadingSubject = new BehaviorSubject<boolean>(false);
39 public loading$ = this.loadingSubject.asObservable();
41 public rowCount = 1; // hide footer during intial load
43 constructor(private policySvc: PolicyService,
44 private sort: MatSort,
45 private notificationService: NotificationService) {
50 this.loadingSubject.next(true);
51 this.policySvc.getPolicyTypes()
53 catchError((her: HttpErrorResponse) => {
54 this.notificationService.error('Failed to get policy types: ' + her.message);
57 finalize(() => this.loadingSubject.next(false))
59 .subscribe((types: PolicyType[]) => {
60 this.rowCount = types.length;
61 this.policyTypeSubject.next(types);
65 connect(collectionViewer: CollectionViewer): Observable<PolicyType[]> {
66 const dataMutations = [
67 this.policyTypeSubject.asObservable(),
70 return merge(...dataMutations).pipe(map(() => {
71 return this.getSortedData([...this.policyTypeSubject.getValue()]);
75 disconnect(collectionViewer: CollectionViewer): void {
76 this.policyTypeSubject.complete();
77 this.loadingSubject.complete();
80 private getSortedData(data: PolicyType[]) {
81 if (!this.sort.active || this.sort.direction === '') {
85 return data.sort((a, b) => {
86 const isAsc = this.sort.direction === 'asc';
87 switch (this.sort.active) {
88 case 'name': return compare(a.name, b.name, isAsc);
95 function compare(a: any, b: any, isAsc: boolean) {
96 return (a < b ? -1 : 1) * (isAsc ? 1 : -1);