forked from hazza/dspace-angular
85 lines
3.0 KiB
TypeScript
85 lines
3.0 KiB
TypeScript
import { Component, Inject, Input, OnInit } from '@angular/core';
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import { BehaviorSubject } from 'rxjs';
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import { BitstreamDataService } from '../../../../core/data/bitstream-data.service';
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import { Bitstream } from '../../../../core/shared/bitstream.model';
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import { Item } from '../../../../core/shared/item.model';
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import { RemoteData } from '../../../../core/data/remote-data';
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import { hasValue } from '../../../../shared/empty.util';
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import { PaginatedList } from '../../../../core/data/paginated-list.model';
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import { NotificationsService } from '../../../../shared/notifications/notifications.service';
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import { TranslateService } from '@ngx-translate/core';
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import { getFirstCompletedRemoteData } from '../../../../core/shared/operators';
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import { AppConfig, APP_CONFIG } from 'src/config/app-config.interface';
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/**
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* This component renders the file section of the item
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* inside a 'ds-metadata-field-wrapper' component.
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*/
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@Component({
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selector: 'ds-item-page-file-section',
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templateUrl: './file-section.component.html'
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})
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export class FileSectionComponent implements OnInit {
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@Input() item: Item;
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label = 'item.page.files';
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separator = '<br/>';
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bitstreams$: BehaviorSubject<Bitstream[]>;
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currentPage: number;
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isLoading: boolean;
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isLastPage: boolean;
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pageSize: number;
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constructor(
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protected bitstreamDataService: BitstreamDataService,
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protected notificationsService: NotificationsService,
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protected translateService: TranslateService,
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@Inject(APP_CONFIG) protected appConfig: AppConfig
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) {
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this.pageSize = this.appConfig.item.bitstream.pageSize;
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}
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ngOnInit(): void {
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this.getNextPage();
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}
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/**
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* This method will retrieve the next page of Bitstreams from the external BitstreamDataService call.
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* It'll retrieve the currentPage from the class variables and it'll add the next page of bitstreams with the
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* already existing one.
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* If the currentPage variable is undefined, we'll set it to 1 and retrieve the first page of Bitstreams
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*/
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getNextPage(): void {
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this.isLoading = true;
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if (this.currentPage === undefined) {
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this.currentPage = 1;
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this.bitstreams$ = new BehaviorSubject([]);
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} else {
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this.currentPage++;
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}
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this.bitstreamDataService.findAllByItemAndBundleName(this.item, 'ORIGINAL', {
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currentPage: this.currentPage,
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elementsPerPage: this.pageSize
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}).pipe(
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getFirstCompletedRemoteData(),
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).subscribe((bitstreamsRD: RemoteData<PaginatedList<Bitstream>>) => {
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if (bitstreamsRD.errorMessage) {
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this.notificationsService.error(this.translateService.get('file-section.error.header'), `${bitstreamsRD.statusCode} ${bitstreamsRD.errorMessage}`);
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} else if (hasValue(bitstreamsRD.payload)) {
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const current: Bitstream[] = this.bitstreams$.getValue();
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this.bitstreams$.next([...current, ...bitstreamsRD.payload.page]);
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this.isLoading = false;
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this.isLastPage = this.currentPage === bitstreamsRD.payload.totalPages;
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}
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});
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}
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}
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