Krzysztof Grobelny | 09b88f2 | 2020-09-02 14:49:01 +0200 | [diff] [blame] | 1 | #pragma once |
| 2 | |
| 3 | #include <sdbusplus/exception.hpp> |
| 4 | #include <sdbusplus/utility/type_traits.hpp> |
| 5 | |
| 6 | #include <algorithm> |
| 7 | #include <bitset> |
| 8 | #include <optional> |
| 9 | #include <stdexcept> |
| 10 | #include <string> |
| 11 | #include <string_view> |
| 12 | #include <variant> |
| 13 | |
| 14 | namespace sdbusplus |
| 15 | { |
| 16 | namespace detail |
| 17 | { |
| 18 | |
| 19 | template <typename Variant, typename ValueType> |
| 20 | bool getIf(Variant&& variant, ValueType& outValue) |
| 21 | { |
| 22 | if (auto value = std::get_if<ValueType>(&variant)) |
| 23 | { |
| 24 | outValue = std::move(*value); |
| 25 | return true; |
| 26 | } |
| 27 | |
| 28 | return false; |
| 29 | } |
| 30 | |
| 31 | template <typename Container> |
| 32 | auto findProperty(Container&& container, const std::string& key) |
| 33 | { |
| 34 | if constexpr (utility::has_member_find_v<Container>) |
| 35 | { |
| 36 | return container.find(key); |
| 37 | } |
| 38 | else |
| 39 | { |
| 40 | return std::find_if( |
| 41 | std::begin(container), std::end(container), |
| 42 | [&key](const auto& keyValue) { return keyValue.first == key; }); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | template <typename Container> |
| 47 | bool containsProperty(Container&& container, const std::string& key) |
| 48 | { |
| 49 | if constexpr (utility::has_member_contains_v<Container>) |
| 50 | { |
| 51 | return container.contains(key); |
| 52 | } |
| 53 | else |
| 54 | { |
| 55 | return findProperty(std::forward<Container>(container), key) != |
| 56 | std::end(container); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | template <size_t Index, typename Container, size_t N, typename ValueType, |
| 61 | typename... Args> |
| 62 | void readProperties(Container&& container, std::bitset<N>& assigned, |
| 63 | const std::string& expectedKey, ValueType& outValue, |
| 64 | Args&&... args) |
| 65 | { |
| 66 | static_assert(Index < N); |
| 67 | |
| 68 | auto it = findProperty(std::forward<Container>(container), expectedKey); |
| 69 | |
| 70 | if (it != std::end(container)) |
| 71 | { |
| 72 | if (getIf(it->second, outValue)) |
| 73 | { |
| 74 | assigned.set(Index); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | if constexpr (sizeof...(Args) > 0) |
| 79 | { |
| 80 | readProperties<Index + 1>(std::forward<Container>(container), assigned, |
| 81 | std::forward<Args>(args)...); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | template <size_t Index, size_t N, typename ValueType, typename... Args> |
| 86 | std::string findMissingProperty(std::bitset<N>& assigned, |
| 87 | const std::string& key, ValueType&, |
| 88 | Args&&... args) |
| 89 | { |
| 90 | static_assert(Index < N); |
| 91 | |
| 92 | if (!assigned.test(Index)) |
| 93 | { |
| 94 | return key; |
| 95 | } |
| 96 | |
| 97 | if constexpr (sizeof...(Args) > 0) |
| 98 | { |
| 99 | return findMissingProperty<Index + 1>(assigned, |
| 100 | std::forward<Args>(args)...); |
| 101 | } |
| 102 | |
| 103 | return {}; |
| 104 | } |
| 105 | |
| 106 | } // namespace detail |
| 107 | |
| 108 | template <typename Container, typename... Args> |
| 109 | void unpackProperties(Container&& input, Args&&... args) |
| 110 | { |
| 111 | static_assert(sizeof...(Args) % 2 == 0); |
| 112 | |
| 113 | auto assigned = std::bitset<sizeof...(Args) / 2>(); |
| 114 | |
| 115 | detail::readProperties<0>(input, assigned, std::forward<Args>(args)...); |
| 116 | |
| 117 | if (!assigned.all()) |
| 118 | { |
| 119 | std::string missingProperty = detail::findMissingProperty<0>( |
| 120 | assigned, std::forward<Args>(args)...); |
| 121 | |
| 122 | if (detail::containsProperty(std::forward<Container>(input), |
| 123 | missingProperty)) |
| 124 | { |
| 125 | throw exception::UnpackPropertyError( |
| 126 | missingProperty, |
| 127 | exception::UnpackPropertyError::reasonTypeNotMatched); |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | throw exception::UnpackPropertyError( |
| 132 | missingProperty, |
| 133 | exception::UnpackPropertyError::reasonMissingProperty); |
| 134 | } |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | } // namespace sdbusplus |