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| 1 // Protocol Buffers - Google's data interchange format | |
| 2 // Copyright 2008 Google Inc. All rights reserved. | |
| 3 // https://developers.google.com/protocol-buffers/ | |
| 4 // | |
| 5 // Redistribution and use in source and binary forms, with or without | |
| 6 // modification, are permitted provided that the following conditions are | |
| 7 // met: | |
| 8 // | |
| 9 // * Redistributions of source code must retain the above copyright | |
| 10 // notice, this list of conditions and the following disclaimer. | |
| 11 // * Redistributions in binary form must reproduce the above | |
| 12 // copyright notice, this list of conditions and the following disclaimer | |
| 13 // in the documentation and/or other materials provided with the | |
| 14 // distribution. | |
| 15 // * Neither the name of Google Inc. nor the names of its | |
| 16 // contributors may be used to endorse or promote products derived from | |
| 17 // this software without specific prior written permission. | |
| 18 // | |
| 19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 30 | |
| 31 // This header file is protobuf internal. Users should not include this | |
| 32 // file directly. | |
| 33 #ifndef GOOGLE_PROTOBUF_REPEATED_FIELD_REFLECTION_H__ | |
| 34 #define GOOGLE_PROTOBUF_REPEATED_FIELD_REFLECTION_H__ | |
| 35 | |
| 36 #include <memory> | |
| 37 #ifndef _SHARED_PTR_H | |
| 38 #include <google/protobuf/stubs/shared_ptr.h> | |
| 39 #endif | |
| 40 | |
| 41 #include <google/protobuf/generated_enum_reflection.h> | |
| 42 | |
| 43 namespace google { | |
| 44 namespace protobuf { | |
| 45 namespace internal { | |
| 46 // Interfaces used to implement reflection RepeatedFieldRef API. | |
| 47 // Reflection::GetRepeatedAccessor() should return a pointer to an singleton | |
| 48 // object that implements the below interface. | |
| 49 // | |
| 50 // This interface passes/returns values using void pointers. The actual type | |
| 51 // of the value depends on the field's cpp_type. Following is a mapping from | |
| 52 // cpp_type to the type that should be used in this interface: | |
| 53 // | |
| 54 // field->cpp_type() T Actual type of void* | |
| 55 // CPPTYPE_INT32 int32 int32 | |
| 56 // CPPTYPE_UINT32 uint32 uint32 | |
| 57 // CPPTYPE_INT64 int64 int64 | |
| 58 // CPPTYPE_UINT64 uint64 uint64 | |
| 59 // CPPTYPE_DOUBLE double double | |
| 60 // CPPTYPE_FLOAT float float | |
| 61 // CPPTYPE_BOOL bool bool | |
| 62 // CPPTYPE_ENUM generated enum type int32 | |
| 63 // CPPTYPE_STRING string string | |
| 64 // CPPTYPE_MESSAGE generated message type google::protobuf::Message | |
| 65 // or google::protobuf::Message | |
| 66 // | |
| 67 // Note that for enums we use int32 in the interface. | |
| 68 // | |
| 69 // You can map from T to the actual type using RefTypeTraits: | |
| 70 // typedef RefTypeTraits<T>::AccessorValueType ActualType; | |
| 71 class LIBPROTOBUF_EXPORT RepeatedFieldAccessor { | |
| 72 public: | |
| 73 // Typedefs for clarity. | |
| 74 typedef void Field; | |
| 75 typedef void Value; | |
| 76 typedef void Iterator; | |
| 77 | |
| 78 virtual ~RepeatedFieldAccessor(); | |
| 79 virtual bool IsEmpty(const Field* data) const = 0; | |
| 80 virtual int Size(const Field* data) const = 0; | |
| 81 // Depends on the underlying representation of the repeated field, this | |
| 82 // method can return a pointer to the underlying object if such an object | |
| 83 // exists, or fill the data into scratch_space and return scratch_space. | |
| 84 // Callers of this method must ensure scratch_space is a valid pointer | |
| 85 // to a mutable object of the correct type. | |
| 86 virtual const Value* Get( | |
| 87 const Field* data, int index, Value* scratch_space) const = 0; | |
| 88 | |
| 89 virtual void Clear(Field* data) const = 0; | |
| 90 virtual void Set(Field* data, int index, const Value* value) const = 0; | |
| 91 virtual void Add(Field* data, const Value* value) const = 0; | |
| 92 virtual void RemoveLast(Field* data) const = 0; | |
| 93 virtual void SwapElements(Field* data, int index1, int index2) const = 0; | |
| 94 virtual void Swap(Field* data, const RepeatedFieldAccessor* other_mutator, | |
| 95 Field* other_data) const = 0; | |
| 96 | |
| 97 // Create an iterator that points at the begining of the repeated field. | |
| 98 virtual Iterator* BeginIterator(const Field* data) const = 0; | |
| 99 // Create an iterator that points at the end of the repeated field. | |
| 100 virtual Iterator* EndIterator(const Field* data) const = 0; | |
| 101 // Make a copy of an iterator and return the new copy. | |
| 102 virtual Iterator* CopyIterator(const Field* data, | |
| 103 const Iterator* iterator) const = 0; | |
| 104 // Move an iterator to point to the next element. | |
| 105 virtual Iterator* AdvanceIterator(const Field* data, | |
| 106 Iterator* iterator) const = 0; | |
| 107 // Compare whether two iterators point to the same element. | |
| 108 virtual bool EqualsIterator(const Field* data, const Iterator* a, | |
| 109 const Iterator* b) const = 0; | |
| 110 // Delete an iterator created by BeginIterator(), EndIterator() and | |
| 111 // CopyIterator(). | |
| 112 virtual void DeleteIterator(const Field* data, Iterator* iterator) const = 0; | |
| 113 // Like Get() but for iterators. | |
| 114 virtual const Value* GetIteratorValue(const Field* data, | |
| 115 const Iterator* iterator, | |
| 116 Value* scratch_space) const = 0; | |
| 117 | |
| 118 // Templated methods that make using this interface easier for non-message | |
| 119 // types. | |
| 120 template<typename T> | |
| 121 T Get(const Field* data, int index) const { | |
| 122 typedef typename RefTypeTraits<T>::AccessorValueType ActualType; | |
| 123 ActualType scratch_space; | |
| 124 return static_cast<T>( | |
| 125 *reinterpret_cast<const ActualType*>( | |
| 126 Get(data, index, static_cast<Value*>(&scratch_space)))); | |
| 127 } | |
| 128 | |
| 129 template<typename T, typename ValueType> | |
| 130 void Set(Field* data, int index, const ValueType& value) const { | |
| 131 typedef typename RefTypeTraits<T>::AccessorValueType ActualType; | |
| 132 // In this RepeatedFieldAccessor interface we pass/return data using | |
| 133 // raw pointers. Type of the data these raw pointers point to should | |
| 134 // be ActualType. Here we have a ValueType object and want a ActualType | |
| 135 // pointer. We can't cast a ValueType pointer to an ActualType pointer | |
| 136 // directly because their type might be different (for enums ValueType | |
| 137 // may be a generated enum type while ActualType is int32). To be safe | |
| 138 // we make a copy to get a temporary ActualType object and use it. | |
| 139 ActualType tmp = static_cast<ActualType>(value); | |
| 140 Set(data, index, static_cast<const Value*>(&tmp)); | |
| 141 } | |
| 142 | |
| 143 template<typename T, typename ValueType> | |
| 144 void Add(Field* data, const ValueType& value) const { | |
| 145 typedef typename RefTypeTraits<T>::AccessorValueType ActualType; | |
| 146 // In this RepeatedFieldAccessor interface we pass/return data using | |
| 147 // raw pointers. Type of the data these raw pointers point to should | |
| 148 // be ActualType. Here we have a ValueType object and want a ActualType | |
| 149 // pointer. We can't cast a ValueType pointer to an ActualType pointer | |
| 150 // directly because their type might be different (for enums ValueType | |
| 151 // may be a generated enum type while ActualType is int32). To be safe | |
| 152 // we make a copy to get a temporary ActualType object and use it. | |
| 153 ActualType tmp = static_cast<ActualType>(value); | |
| 154 Add(data, static_cast<const Value*>(&tmp)); | |
| 155 } | |
| 156 }; | |
| 157 | |
| 158 // Implement (Mutable)RepeatedFieldRef::iterator | |
| 159 template<typename T> | |
| 160 class RepeatedFieldRefIterator | |
| 161 : public std::iterator<std::forward_iterator_tag, T> { | |
| 162 typedef typename RefTypeTraits<T>::AccessorValueType AccessorValueType; | |
| 163 typedef typename RefTypeTraits<T>::IteratorValueType IteratorValueType; | |
| 164 typedef typename RefTypeTraits<T>::IteratorPointerType IteratorPointerType; | |
| 165 | |
| 166 public: | |
| 167 // Constructor for non-message fields. | |
| 168 RepeatedFieldRefIterator(const void* data, | |
| 169 const RepeatedFieldAccessor* accessor, | |
| 170 bool begin) | |
| 171 : data_(data), accessor_(accessor), | |
| 172 iterator_(begin ? accessor->BeginIterator(data) : | |
| 173 accessor->EndIterator(data)), | |
| 174 scratch_space_(new AccessorValueType) { | |
| 175 } | |
| 176 // Constructor for message fields. | |
| 177 RepeatedFieldRefIterator(const void* data, | |
| 178 const RepeatedFieldAccessor* accessor, | |
| 179 bool begin, | |
| 180 AccessorValueType* scratch_space) | |
| 181 : data_(data), accessor_(accessor), | |
| 182 iterator_(begin ? accessor->BeginIterator(data) : | |
| 183 accessor->EndIterator(data)), | |
| 184 scratch_space_(scratch_space) { | |
| 185 } | |
| 186 ~RepeatedFieldRefIterator() { | |
| 187 accessor_->DeleteIterator(data_, iterator_); | |
| 188 } | |
| 189 RepeatedFieldRefIterator operator++(int) { | |
| 190 RepeatedFieldRefIterator tmp(*this); | |
| 191 iterator_ = accessor_->AdvanceIterator(data_, iterator_); | |
| 192 return tmp; | |
| 193 } | |
| 194 RepeatedFieldRefIterator& operator++() { | |
| 195 iterator_ = accessor_->AdvanceIterator(data_, iterator_); | |
| 196 return *this; | |
| 197 } | |
| 198 IteratorValueType operator*() const { | |
| 199 return static_cast<IteratorValueType>( | |
| 200 *static_cast<const AccessorValueType*>( | |
| 201 accessor_->GetIteratorValue( | |
| 202 data_, iterator_, scratch_space_.get()))); | |
| 203 } | |
| 204 IteratorPointerType operator->() const { | |
| 205 return static_cast<IteratorPointerType>( | |
| 206 accessor_->GetIteratorValue( | |
| 207 data_, iterator_, scratch_space_.get())); | |
| 208 } | |
| 209 bool operator!=(const RepeatedFieldRefIterator& other) const { | |
| 210 assert(data_ == other.data_); | |
| 211 assert(accessor_ == other.accessor_); | |
| 212 return !accessor_->EqualsIterator(data_, iterator_, other.iterator_); | |
| 213 } | |
| 214 bool operator==(const RepeatedFieldRefIterator& other) const { | |
| 215 return !this->operator!=(other); | |
| 216 } | |
| 217 | |
| 218 RepeatedFieldRefIterator(const RepeatedFieldRefIterator& other) | |
| 219 : data_(other.data_), accessor_(other.accessor_), | |
| 220 iterator_(accessor_->CopyIterator(data_, other.iterator_)) { | |
| 221 } | |
| 222 RepeatedFieldRefIterator& operator=(const RepeatedFieldRefIterator& other) { | |
| 223 if (this != &other) { | |
| 224 accessor_->DeleteIterator(data_, iterator_); | |
| 225 data_ = other.data_; | |
| 226 accessor_ = other.accessor_; | |
| 227 iterator_ = accessor_->CopyIterator(data_, other.iterator_); | |
| 228 } | |
| 229 return *this; | |
| 230 } | |
| 231 | |
| 232 protected: | |
| 233 const void* data_; | |
| 234 const RepeatedFieldAccessor* accessor_; | |
| 235 void* iterator_; | |
| 236 google::protobuf::scoped_ptr<AccessorValueType> scratch_space_; | |
| 237 }; | |
| 238 | |
| 239 // TypeTraits that maps the type parameter T of RepeatedFieldRef or | |
| 240 // MutableRepeatedFieldRef to corresponding iterator type, | |
| 241 // RepeatedFieldAccessor type, etc. | |
| 242 template<typename T> | |
| 243 struct PrimitiveTraits { | |
| 244 static const bool is_primitive = false; | |
| 245 }; | |
| 246 #define DEFINE_PRIMITIVE(TYPE, type) \ | |
| 247 template<> struct PrimitiveTraits<type> { \ | |
| 248 static const bool is_primitive = true; \ | |
| 249 static const FieldDescriptor::CppType cpp_type = \ | |
| 250 FieldDescriptor::CPPTYPE_ ## TYPE; \ | |
| 251 }; | |
| 252 DEFINE_PRIMITIVE(INT32, int32) | |
| 253 DEFINE_PRIMITIVE(UINT32, uint32) | |
| 254 DEFINE_PRIMITIVE(INT64, int64) | |
| 255 DEFINE_PRIMITIVE(UINT64, uint64) | |
| 256 DEFINE_PRIMITIVE(FLOAT, float) | |
| 257 DEFINE_PRIMITIVE(DOUBLE, double) | |
| 258 DEFINE_PRIMITIVE(BOOL, bool) | |
| 259 #undef DEFINE_PRIMITIVE | |
| 260 | |
| 261 template<typename T> | |
| 262 struct RefTypeTraits< | |
| 263 T, typename internal::enable_if<PrimitiveTraits<T>::is_primitive>::type> { | |
| 264 typedef RepeatedFieldRefIterator<T> iterator; | |
| 265 typedef RepeatedFieldAccessor AccessorType; | |
| 266 typedef T AccessorValueType; | |
| 267 typedef T IteratorValueType; | |
| 268 typedef T* IteratorPointerType; | |
| 269 static const FieldDescriptor::CppType cpp_type = | |
| 270 PrimitiveTraits<T>::cpp_type; | |
| 271 static const Descriptor* GetMessageFieldDescriptor() { | |
| 272 return NULL; | |
| 273 } | |
| 274 }; | |
| 275 | |
| 276 template<typename T> | |
| 277 struct RefTypeTraits< | |
| 278 T, typename internal::enable_if<is_proto_enum<T>::value>::type> { | |
| 279 typedef RepeatedFieldRefIterator<T> iterator; | |
| 280 typedef RepeatedFieldAccessor AccessorType; | |
| 281 // We use int32 for repeated enums in RepeatedFieldAccessor. | |
| 282 typedef int32 AccessorValueType; | |
| 283 typedef T IteratorValueType; | |
| 284 typedef int32* IteratorPointerType; | |
| 285 static const FieldDescriptor::CppType cpp_type = | |
| 286 FieldDescriptor::CPPTYPE_ENUM; | |
| 287 static const Descriptor* GetMessageFieldDescriptor() { | |
| 288 return NULL; | |
| 289 } | |
| 290 }; | |
| 291 | |
| 292 template<typename T> | |
| 293 struct RefTypeTraits< | |
| 294 T, typename internal::enable_if<internal::is_same<string, T>::value>::type>
{ | |
| 295 typedef RepeatedFieldRefIterator<T> iterator; | |
| 296 typedef RepeatedFieldAccessor AccessorType; | |
| 297 typedef string AccessorValueType; | |
| 298 typedef string IteratorValueType; | |
| 299 typedef string* IteratorPointerType; | |
| 300 static const FieldDescriptor::CppType cpp_type = | |
| 301 FieldDescriptor::CPPTYPE_STRING; | |
| 302 static const Descriptor* GetMessageFieldDescriptor() { | |
| 303 return NULL; | |
| 304 } | |
| 305 }; | |
| 306 | |
| 307 template<typename T> | |
| 308 struct MessageDescriptorGetter { | |
| 309 static const Descriptor* get() { | |
| 310 return T::default_instance().GetDescriptor(); | |
| 311 } | |
| 312 }; | |
| 313 template<> | |
| 314 struct MessageDescriptorGetter<Message> { | |
| 315 static const Descriptor* get() { | |
| 316 return NULL; | |
| 317 } | |
| 318 }; | |
| 319 | |
| 320 template<typename T> | |
| 321 struct RefTypeTraits< | |
| 322 T, typename internal::enable_if<internal::is_base_of<Message, T>::value>::ty
pe> { | |
| 323 typedef RepeatedFieldRefIterator<T> iterator; | |
| 324 typedef RepeatedFieldAccessor AccessorType; | |
| 325 typedef Message AccessorValueType; | |
| 326 typedef const T& IteratorValueType; | |
| 327 typedef const T* IteratorPointerType; | |
| 328 static const FieldDescriptor::CppType cpp_type = | |
| 329 FieldDescriptor::CPPTYPE_MESSAGE; | |
| 330 static const Descriptor* GetMessageFieldDescriptor() { | |
| 331 return MessageDescriptorGetter<T>::get(); | |
| 332 } | |
| 333 }; | |
| 334 } // namespace internal | |
| 335 } // namespace protobuf | |
| 336 } // namespace google | |
| 337 #endif // GOOGLE_PROTOBUF_REPEATED_FIELD_REFLECTION_H__ | |
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Chromium Code Reviews
Issue 2598373002:
third_party/protobuf: Update to HEAD (5f65ee6ac7) (Closed)
