Initial commit for the Angular part. We are nowhere yet.

bookie/src/app/guest-book/guest-book.service.ts

@@ -0,0 +1,66 @@
+import {Injectable} from '@angular/core';
+import {Observable} from 'rxjs/internal/Observable';
+import {catchError} from 'rxjs/operators';
+import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http';
+import {GuestBook} from './guest-book';
+import {ErrorLoggerService} from '../core/error-logger.service';
+
+const httpOptions = {
+  headers: new HttpHeaders({'Content-Type': 'application/json'})
+};
+
+const url = '/v1/guest-book';
+const serviceName = 'GuestBookService';
+
+@Injectable({providedIn: 'root'})
+export class GuestBookService {
+
+  constructor(private http: HttpClient, private log: ErrorLoggerService) {
+  }
+
+  get(id: string): Observable<GuestBook> {
+    const getUrl: string = (id === null) ? `${url}/new` : `${url}/${id}`;
+    return <Observable<GuestBook>>this.http.get<GuestBook>(getUrl)
+      .pipe(
+        catchError(this.log.handleError(serviceName, `get id=${id}`))
+      );
+  }
+
+  list(date: string): Observable<GuestBook[]> {
+    const options = {params: new HttpParams().set('q', (date === null) ? '' : date)};
+    const listUrl: string = `${url}/list`;
+    return <Observable<GuestBook[]>>this.http.get<GuestBook[]>(listUrl, options)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'list'))
+      );
+  }
+
+  save(guestBook: GuestBook): Observable<GuestBook> {
+    return <Observable<GuestBook>>this.http.put<GuestBook>(`${url}/new`, guestBook, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'save'))
+      );
+  }
+
+  update(guestBook: GuestBook): Observable<GuestBook> {
+    return <Observable<GuestBook>>this.http.post<GuestBook>(`${url}/${guestBook.id}`, guestBook, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'update'))
+      );
+  }
+
+  saveOrUpdate(guestBook: GuestBook): Observable<GuestBook> {
+    if (!guestBook.id) {
+      return this.save(guestBook);
+    } else {
+      return this.update(guestBook);
+    }
+  }
+
+  delete(id: string): Observable<GuestBook> {
+    return <Observable<GuestBook>>this.http.delete<GuestBook>(`${url}/${id}`, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'delete'))
+      );
+  }
+}