63945: Edit bitstream tab intermediate commit

src/app/+item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts

@@ -1,4 +1,11 @@
-import { Component } from '@angular/core';
+import { Component, OnDestroy } from '@angular/core';
+import { AbstractItemUpdateComponent } from '../abstract-item-update/abstract-item-update.component';
+import { switchMap, take } from 'rxjs/operators';
+import { Bitstream } from '../../../core/shared/bitstream.model';
+import { getBundleNames, toBitstreamsArray, toBundleMap } from '../../../core/shared/item-bitstreams-utils';
+import { Observable } from 'rxjs/internal/Observable';
+import { FieldUpdates } from '../../../core/data/object-updates/object-updates.reducer';
+import { Subscription } from 'rxjs/internal/Subscription';
 
 @Component({
   selector: 'ds-item-bitstreams',
@@ -8,6 +15,56 @@ import { Component } from '@angular/core';
 /**
  * Component for displaying an item's bitstreams edit page
  */
-export class ItemBitstreamsComponent {
-  /* TODO implement */
+export class ItemBitstreamsComponent extends AbstractItemUpdateComponent implements OnDestroy {
+
+  bundleNames$: Observable<string[]>;
+
+  updatesMap: Map<string, Observable<FieldUpdates>>;
+
+  updatesMapSub: Subscription;
+
+  /**
+   * Set up and initialize all fields
+   */
+  ngOnInit(): void {
+    super.ngOnInit();
+    this.bundleNames$ = this.item.bitstreams.pipe(getBundleNames());
+  }
+
+  initializeNotificationsPrefix(): void {
+    this.notificationsPrefix = 'item.edit.bitstreams.notifications.';
+  }
+
+  initializeOriginalFields(): void {
+    this.item.bitstreams.pipe(
+      toBitstreamsArray(),
+      take(1)
+    ).subscribe((bitstreams: Bitstream[]) => {
+      this.objectUpdatesService.initialize(this.url, bitstreams, this.item.lastModified);
+    });
+  }
+
+  initializeUpdates(): void {
+    this.updates$ = this.item.bitstreams.pipe(
+      toBitstreamsArray(),
+      switchMap((bitstreams: Bitstream[]) => this.objectUpdatesService.getFieldUpdates(this.url, bitstreams))
+    );
+    this.updatesMapSub = this.item.bitstreams.pipe(
+      toBundleMap()
+    ).subscribe((bundleMap: Map<string, Bitstream[]>) => {
+      const updatesMap = new Map();
+      bundleMap.forEach((bitstreams: Bitstream[], bundleName: string) => {
+        updatesMap.set(bundleName, this.objectUpdatesService.getFieldUpdatesExclusive(this.url, bitstreams));
+      });
+      this.updatesMap = updatesMap;
+    });
+  }
+
+  submit() {
+    // TODO: submit changes
+  }
+
+  ngOnDestroy(): void {
+    this.updatesMapSub.unsubscribe();
+  }
 }