/
WatchFieldsOperator.ts
32 lines (29 loc) · 1.17 KB
/
WatchFieldsOperator.ts
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// Copyright 2015-2019 SWIM.AI 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 {KeyEffect} from "../KeyEffect";
import {AbstractMapInlet} from "../AbstractMapInlet";
export abstract class WatchFieldsOperator<K, V, O> extends AbstractMapInlet<K, V, O> {
protected onReconcileOutputKey(key: K, effect: KeyEffect, version: number): void {
if (effect === KeyEffect.Update) {
if (this._input !== null) {
this.evaluate(key, this._input.get(key));
} else {
this.evaluate(key, void 0);
}
} else if (effect === KeyEffect.Remove) {
this.evaluate(key, void 0);
}
}
abstract evaluate(key: K, value: V | undefined): void;
}