1 files changed, 85 insertions, 0 deletions
diff --git a/portal-FE-common/src/app/shared/plugin/transfer-state.service.ts b/portal-FE-common/src/app/shared/plugin/transfer-state.service.ts
new file mode 100644
index 00000000..e42abcb8
--- /dev/null
+++ b/portal-FE-common/src/app/shared/plugin/transfer-state.service.ts
@@ -0,0 +1,85 @@
+/*-
+ * ============LICENSE_START==========================================
+ * ONAP Portal
+ * ===================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ===================================================================
+ *
+ * Unless otherwise specified, all software contained herein is licensed
+ * under the Apache License, Version 2.0 (the "License");
+ * you may not use this software 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.
+ *
+ * Unless otherwise specified, all documentation contained herein is licensed
+ * under the Creative Commons License, Attribution 4.0 Intl. (the "License");
+ * you may not use this documentation except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *             https://creativecommons.org/licenses/by/4.0/
+ *
+ * Unless required by applicable law or agreed to in writing, documentation
+ * 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.
+ *
+ * ============LICENSE_END============================================
+ *
+ * 
+ */
+ 
+import { Inject, Injectable, PLATFORM_ID } from '@angular/core';
+import { makeStateKey, TransferState } from '@angular/platform-browser';
+import { isPlatformBrowser, isPlatformServer } from '@angular/common';
+import { of } from 'rxjs';
+import { tap } from 'rxjs/operators';
+
+let isBrowser: boolean;
+let isServer: boolean;
+let transferState: TransferState;
+
+@Injectable({
+  providedIn: 'root'
+})
+export class TransferStateService {
+  constructor(
+    private state: TransferState,
+    @Inject(PLATFORM_ID) private platformId: any
+  ) {
+    transferState = state;
+    isBrowser = isPlatformBrowser(this.platformId);
+    isServer = isPlatformServer(this.platformId);
+  }
+}
+
+export const preserveServerState = (
+  keyName: string,
+  emptyResult: any = null
+) => {
+  const key = makeStateKey(keyName);
+  return (target: any, propertyKey: string, descriptor: PropertyDescriptor) => {
+    const method = descriptor.value;
+    descriptor.value = function() {
+      if (isBrowser && transferState.hasKey(key)) {
+        const state = transferState.get(key, emptyResult);
+        return of(state);
+      }
+
+      return method.apply(this, arguments).pipe(
+        tap(res => {
+         // if (isServer) {
+            transferState.set(key, res);
+        //  }
+        })
+      );
+    };
+  };
+};