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
18 namespace 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 */
26 template<typename T>
27 class CreateFunctor {
28 public:
operator ()(const typename T::SpecificInfoType & specific) const29 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
36 template<typename T>
37 class CheckFunctor {
38 public:
operator ()(const typename T::SpecificInfoType & specific) const39 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
46 template<template<typename> typename Functor, typename ...Component>
47 class Visitor : Functor<Component>... {
48 public:
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()...;
Visit(const UxViewInfo & info) const55 auto Visit(const UxViewInfo &info) const
56 {
57 return std::visit(*this, info.specificInfo)(info);
58 }
59 };
60
CreateUxComponent(const UxViewInfo & info)61 std::unique_ptr<ComponentInterface> ComponentFactory::CreateUxComponent(const UxViewInfo &info)
62 {
63 return Visitor<CreateFunctor, COMPONENT_TYPE_LIST> {}.Visit(info);
64 }
65
CheckUxComponent(const UxViewInfo & info)66 bool ComponentFactory::CheckUxComponent(const UxViewInfo &info)
67 {
68 return Visitor<CheckFunctor, COMPONENT_TYPE_LIST> {}.Visit(info);
69 }
70 } // namespace Updater
71