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/*-
* ============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);
// }
})
);
};
};
};
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