From e3fdd3a4fd8e37660cfd89644cf2cc4521220df7 Mon Sep 17 00:00:00 2001 From: Bruno Windels Date: Tue, 6 Oct 2020 12:20:28 +0200 Subject: [PATCH] ApplyMap, your observable map collection for applying side-effects --- src/observable/map/ApplyMap.js | 81 ++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 src/observable/map/ApplyMap.js diff --git a/src/observable/map/ApplyMap.js b/src/observable/map/ApplyMap.js new file mode 100644 index 00000000..2a2dc19c --- /dev/null +++ b/src/observable/map/ApplyMap.js @@ -0,0 +1,81 @@ +/* +Copyright 2020 Bruno Windels + +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 {BaseObservableMap} from "./BaseObservableMap.js"; + +export class ApplyMap extends BaseObservableMap { + constructor(source, apply) { + super(); + this._source = source; + this._apply = apply; + this._subscription = null; + } + + setApply(apply) { + this._apply = apply; + if (apply) { + this.applyOnce(this._apply); + } + } + + applyOnce(apply) { + for (const [key, value] of this._source) { + apply(key, value); + } + } + + onAdd(key, value) { + if (this._apply) { + this._apply(key, value); + } + this.emitAdd(key, value); + } + + onRemove(key, value) { + this.emitRemove(key, value); + } + + onUpdate(key, value, params) { + if (this._apply) { + this._apply(key, value, params); + } + this.emitUpdate(key, value, params); + } + + onSubscribeFirst() { + this._subscription = this._source.subscribe(this); + if (this._apply) { + this.applyOnce(this._apply); + } + super.onSubscribeFirst(); + } + + onUnsubscribeLast() { + super.onUnsubscribeLast(); + this._subscription = this._subscription(); + } + + onReset() { + if (this._apply) { + this.applyOnce(this._apply); + } + this.emitReset(); + } + + [Symbol.iterator]() { + return this._source[Symbol.iterator](); + } +}