1/*
2 * Copyright (c) 2022 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
16#ifndef ID_FACTORY_H
17#define ID_FACTORY_H
18
19#include <set>
20
21#include "nocopyable.h"
22
23namespace OHOS {
24namespace MMI {
25template<typename T>
26class IdFactory {
27public:
28    IdFactory() : IdFactory(1) {}
29    explicit IdFactory(T seed) : seed_(seed) {}
30    virtual ~IdFactory() = default;
31    DISALLOW_COPY_AND_MOVE(IdFactory);
32
33    T GenerateId()
34    {
35        if (ids_.empty()) {
36            if (seed_ == maxLimit_) {
37                return 0;
38            }
39            return seed_++;
40        }
41        T id = *ids_.begin();
42        ids_.erase(ids_.begin());
43        return id;
44    }
45    void RecoveryId(T id)
46    {
47        if (id > seed_) {
48            return;
49        }
50        ids_.insert(id);
51    }
52
53private:
54    T seed_ { 0 };
55    const T maxLimit_ = std::numeric_limits<T>::max();
56    std::set<T> ids_;
57};
58} // namespace MMI
59} // namespace OHOS
60#endif // ID_FACTORY_H
61