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#include "component_factory.h"
17
18namespace Updater {
19/*
20 * T is component, T::SpecificInfoType is the specific info of this component.
21 * ex. T is ImgViewAdapter, then T::SpecificInfoType is UxImageInfo
22 * T is LabelBtnAdapter, then T::SpecificInfoType is UxLabelBtnInfo
23 * T is BoxProgressAdapter, then T::SpecificInfoType is UxBoxProgressInfo
24 * T is TextLabelAdapter, then T::SpecificInfoType is UxLabelInfo
25 */
26template<typename T>
27class CreateFunctor {
28public:
29    auto operator()([[maybe_unused]] const typename T::SpecificInfoType &specific) const
30        -> std::function<std::unique_ptr<ComponentInterface>(const UxViewInfo &info)>
31    {
32        return [] (const UxViewInfo &info) { return std::make_unique<T>(info); };
33    }
34};
35
36template<typename T>
37class CheckFunctor {
38public:
39    auto operator()(const typename T::SpecificInfoType &specific) const
40        -> std::function<bool(const UxViewInfo &info)>
41    {
42        return [&specific] ([[maybe_unused]] const UxViewInfo &info) { return T::IsValid(specific); };
43    }
44};
45
46template<template<typename> typename Functor, typename ...Component>
47class Visitor : Functor<Component>... {
48public:
49    /*
50     * overloading only works within the same scope.
51     * so import overloaded operator() into this scope
52     * from base class
53     */
54    using Functor<Component>::operator()...;
55    auto Visit(const UxViewInfo &info) const
56    {
57        return std::visit(*this, info.specificInfo)(info);
58    }
59};
60
61std::unique_ptr<ComponentInterface> ComponentFactory::CreateUxComponent(const UxViewInfo &info)
62{
63    return Visitor<CreateFunctor, COMPONENT_TYPE_LIST> {}.Visit(info);
64}
65
66bool ComponentFactory::CheckUxComponent(const UxViewInfo &info)
67{
68    return Visitor<CheckFunctor, COMPONENT_TYPE_LIST> {}.Visit(info);
69}
70} // namespace Updater
71