| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 {BehaviorSubject, Subject} from 'rxjs'; |
| import {scan, tap} from 'rxjs/operators'; |
| |
| export default class ConfigureState { |
| actions$: Subject<{type: string}>; |
| |
| constructor() { |
| this.actions$ = new Subject(); |
| this.state$ = new BehaviorSubject({}); |
| this._combinedReducer = (state, action) => state; |
| |
| const reducer = (state = {}, action) => { |
| try { |
| return this._combinedReducer(state, action); |
| } |
| catch (e) { |
| console.error(e); |
| |
| return state; |
| } |
| }; |
| |
| this.actions$.pipe( |
| scan(reducer, {}), |
| tap((v) => this.state$.next(v)) |
| ).subscribe(); |
| } |
| |
| addReducer(combineFn) { |
| const old = this._combinedReducer; |
| |
| this._combinedReducer = (state, action) => combineFn(old(state, action), action); |
| |
| return this; |
| } |
| |
| dispatchAction(action) { |
| if (typeof action === 'function') |
| return action((a) => this.actions$.next(a), () => this.state$.getValue()); |
| |
| this.actions$.next(action); |
| |
| return action; |
| } |
| } |