1/*
2 * Copyright (c) 2022-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16export function mergeArrayMaps<K, V>(lhs: Map<K, V[]>, rhs: Map<K, V[]>): Map<K, V[]> {
17  if (lhs.size === 0) {
18    return rhs;
19  }
20  if (rhs.size === 0) {
21    return lhs;
22  }
23
24  rhs.forEach((values, key) => {
25    if (values.length !== 0) {
26      if (lhs.has(key)) {
27        lhs.get(key)!.push(...values);
28      } else {
29        lhs.set(key, values);
30      }
31    }
32  });
33  return lhs;
34}
35