"use strict";
/**
* Copyright 2023 Google LLC.
* Copyright (c) Microsoft Corporation.
*
* 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.DefaultMap = void 0;
/**
* A subclass of Map whose functionality is almost the same as its parent
* except for the fact that DefaultMap never returns undefined. It provides a
* default value for keys that do not exist.
*/
class DefaultMap extends Map {
/** The default value to return whenever a key is not present in the map. */
#getDefaultValue;
constructor(getDefaultValue, entries) {
super(entries);
this.#getDefaultValue = getDefaultValue;
}
get(key) {
if (!this.has(key)) {
this.set(key, this.#getDefaultValue(key));
}
return super.get(key);
}
}
exports.DefaultMap = DefaultMap;
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