1 files changed, 41 insertions, 0 deletions
diff --git a/gae/frontend/src/app/shared/servicebase.ts b/gae/frontend/src/app/shared/servicebase.ts
new file mode 100644
index 0000000..9eaecf8
--- /dev/null
+++ b/gae/frontend/src/app/shared/servicebase.ts
@@ -0,0 +1,41 @@
+/**
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { HttpClient, HttpErrorResponse, HttpParams, HttpResponse } from '@angular/common/http';
+import { Observable, throwError } from 'rxjs';
+
+export class ServiceBase {
+  url: string;
+  protected constructor(public httpClient: HttpClient) {
+  }
+  protected handleError(error: HttpErrorResponse) {
+    if (error.error instanceof ErrorEvent) {
+      // A client-side or network error occurred. Handle it accordingly.
+      console.error('An error occurred:', error.error.message);
+    } else {
+      // The backend returned an unsuccessful response code.
+      // The response body may contain clues as to what went wrong,
+      console.error(
+        `Backend returned code ${error.status}, ` +
+        `body was: ${error.error}`);
+    }
+    // return an observable with a user-facing error message
+    return throwError(error);
+  }
+  public getCount(filterInfo: string): Observable<number> {
+    const url = this.url + 'count';
+    return this.httpClient.post<number>(url, {filter: filterInfo});
+  }
+}