107 lines
2.7 KiB
TypeScript
107 lines
2.7 KiB
TypeScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {BaseObservableMap} from "./index";
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import {SubscriptionHandle} from "../BaseObservable";
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/*
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This class MUST never be imported directly from here.
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Instead, it MUST be imported from index.ts. See the
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top level comment in index.ts for details.
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*/
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export class ApplyMap<K, V> extends BaseObservableMap<K, V> {
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private _source: BaseObservableMap<K, V>;
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private _subscription?: SubscriptionHandle;
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private _apply?: Apply<K, V>;
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constructor(source: BaseObservableMap<K, V>, apply?: Apply<K, V>) {
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super();
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this._source = source;
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this._apply = apply;
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}
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hasApply(): boolean {
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return !!this._apply;
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}
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setApply(apply?: Apply<K, V>): void {
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this._apply = apply;
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if (this._apply) {
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this.applyOnce(this._apply);
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}
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}
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applyOnce(apply: Apply<K, V>): void {
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for (const [key, value] of this._source) {
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apply(key, value);
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}
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}
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onAdd(key: K, value: V): void {
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if (this._apply) {
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this._apply(key, value);
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}
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this.emitAdd(key, value);
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}
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onRemove(key: K, value: V): void {
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this.emitRemove(key, value);
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}
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onUpdate(key: K, value: V, params: any): void {
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if (this._apply) {
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this._apply(key, value, params);
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}
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this.emitUpdate(key, value, params);
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}
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onSubscribeFirst(): void {
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this._subscription = this._source.subscribe(this);
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if (this._apply) {
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this.applyOnce(this._apply);
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}
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super.onSubscribeFirst();
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}
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onUnsubscribeLast(): void {
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super.onUnsubscribeLast();
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if (this._subscription) {
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this._subscription = this._subscription();
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}
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}
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onReset(): void {
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if (this._apply) {
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this.applyOnce(this._apply);
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}
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this.emitReset();
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}
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[Symbol.iterator](): Iterator<[K, V]> {
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return this._source[Symbol.iterator]();
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}
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get size(): number {
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return this._source.size;
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}
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get(key: K): V | undefined {
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return this._source.get(key);
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}
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}
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type Apply<K, V> = (key: K, value: V, params?: any) => void; |