/
MapOutput.ts
64 lines (59 loc) · 1.9 KB
/
MapOutput.ts
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// Copyright 2015-2021 Swim inc.
//
// 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 type {Map} from "@swim/util";
import {BTree} from "@swim/collections";
import {KeyEffect} from "./KeyEffect";
import {AbstractMapInlet} from "./AbstractMapInlet";
export class MapOutput<K, V> extends AbstractMapInlet<K, V, Map<K, V>> {
constructor() {
super();
Object.defineProperty(this, "state", {
value: new BTree(),
enumerable: true,
configurable: true,
});
}
/** @hidden */
readonly state!: BTree<K, V>;
get(): Map<K, V> {
return this.state;
}
protected override onRecohereOutputKey(key: K, effect: KeyEffect, version: number): void {
if (effect === KeyEffect.Update) {
const input = this.input;
if (input !== null) {
const value = input.get(key);
if (value !== void 0) {
Object.defineProperty(this, "state", {
value: this.state.updated(key, value),
enumerable: true,
configurable: true,
});
} else {
Object.defineProperty(this, "state", {
value: this.state.removed(key),
enumerable: true,
configurable: true,
});
}
}
} else if (effect === KeyEffect.Remove) {
Object.defineProperty(this, "state", {
value: this.state.removed(key),
enumerable: true,
configurable: true,
});
}
}
}