Added PIDService

src/app/core/core.module.ts

@@ -20,6 +20,7 @@ import { CollectionDataService } from './data/collection-data.service';
 import { CommunityDataService } from './data/community-data.service';
 import { DebugResponseParsingService } from './data/debug-response-parsing.service';
 import { DSOResponseParsingService } from './data/dso-response-parsing.service';
+import { PIDService } from './data/pid.service';
 import { SearchResponseParsingService } from './data/search-response-parsing.service';
 import { DSpaceRESTv2Service } from './dspace-rest-v2/dspace-rest-v2.service';
 import { HostWindowService } from '../shared/host-window.service';
@@ -110,6 +111,7 @@ const PROVIDERS = [
   SubmissionFormsConfigService,
   SubmissionSectionsConfigService,
   UUIDService,
+  PIDService,
   // register AuthInterceptor as HttpInterceptor
   {
     provide: HTTP_INTERCEPTORS,

src/app/core/data/pid.service.spec.ts

+import { cold, getTestScheduler } from 'jasmine-marbles';
+import { TestScheduler } from '../../../../node_modules/rxjs';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { DSpaceObject } from '../shared/dspace-object.model';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { PIDService } from './pid.service';
+import { FindByIDRequest } from './request.models';
+import { RequestService } from './request.service';
+
+fdescribe('PIDService', () => {
+  let scheduler: TestScheduler;
+  let service: PIDService;
+  let halService: HALEndpointService;
+  let requestService: RequestService;
+  let rdbService: RemoteDataBuildService;
+  const testObject = {
+    id: '9b4f22f4-164a-49db-8817-3316b6ee5746'
+  } as DSpaceObject;
+  const pidLink = 'https://rest.api/rest/api/pid/find{?id}';
+  const requestURL = `https://rest.api/rest/api/pid/find?id=${testObject.id}`;
+  const requestUUID = '34cfed7c-f597-49ef-9cbe-ea351f0023c2';
+
+  beforeEach(() => {
+    scheduler = getTestScheduler();
+
+    halService = jasmine.createSpyObj('halService', {
+      getEndpoint: cold('a', { a: pidLink })
+    });
+    requestService = jasmine.createSpyObj('requestService', {
+      generateRequestId: requestUUID,
+      configure: true
+    });
+    rdbService = jasmine.createSpyObj('rdbService', {
+      buildSingle: cold('a', {
+        a: {
+          payload: testObject
+        }
+      })
+    });
+
+    service = new PIDService(
+      requestService,
+      rdbService,
+      halService
+    )
+  });
+
+  describe('findById', () => {
+    it('should call HALEndpointService with the path to the pid endpoint', () => {
+      scheduler.schedule(() => service.findById(testObject.id));
+      scheduler.flush();
+
+      expect(halService.getEndpoint).toHaveBeenCalledWith('pid');
+    });
+
+    it('should configure the proper FindByIDRequest', () => {
+      scheduler.schedule(() => service.findById(testObject.id));
+      scheduler.flush();
+
+      expect(requestService.configure).toHaveBeenCalledWith(new FindByIDRequest(requestUUID, requestURL, testObject.id));
+    });
+
+    it('should return a RemoteData<DSpaceObject> for the object with the given ID', () => {
+      const result = service.findById(testObject.id);
+      const expected = cold('a', {
+        a: {
+          payload: testObject
+        }
+      });
+      expect(result).toBeObservable(expected);
+    });
+  });
+});

src/app/core/data/pid.service.ts

+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs/Observable';
+import { hasValue } from '../../shared/empty.util';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { NormalizedDSpaceObject } from '../cache/models/normalized-dspace-object.model';
+import { DSpaceObject } from '../shared/dspace-object.model';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { RemoteData } from './remote-data';
+import { FindByIDRequest } from './request.models';
+import { RequestService } from './request.service';
+
+@Injectable()
+export class PIDService {
+  protected linkPath = 'pid';
+
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected halService: HALEndpointService) {
+  }
+
+  findById(id: string): Observable<RemoteData<DSpaceObject>> {
+    const hrefObs = this.halService.getEndpoint(this.linkPath)
+      .map((endpoint: string) => endpoint.replace(/\{\?id\}/,`?id=${id}`));
+
+    hrefObs
+      .filter((href: string) => hasValue(href))
+      .take(1)
+      .subscribe((href: string) => {
+        const request = new FindByIDRequest(this.requestService.generateRequestId(), href, id);
+        this.requestService.configure(request);
+      });
+
+    return this.rdbService.buildSingle<NormalizedDSpaceObject, DSpaceObject>(hrefObs);
+  }
+}