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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
+#define GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
+
+#include <map_field.h>
+#include <reflection.h>
+#include <repeated_field.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+// A base class for RepeatedFieldAccessor implementations that can support
+// random-access efficiently. All iterator methods delegates the work to
+// corresponding random-access methods.
+class RandomAccessRepeatedFieldAccessor : public RepeatedFieldAccessor {
+ public:
+ Iterator* BeginIterator(const Field* /*data*/) const override {
+ return PositionToIterator(0);
+ }
+ Iterator* EndIterator(const Field* data) const override {
+ return PositionToIterator(this->Size(data));
+ }
+ Iterator* CopyIterator(const Field* /*data*/,
+ const Iterator* iterator) const override {
+ return const_cast<Iterator*>(iterator);
+ }
+ Iterator* AdvanceIterator(const Field* /*data*/,
+ Iterator* iterator) const override {
+ return PositionToIterator(IteratorToPosition(iterator) + 1);
+ }
+ bool EqualsIterator(const Field* /*data*/, const Iterator* a,
+ const Iterator* b) const override {
+ return a == b;
+ }
+ void DeleteIterator(const Field* /*data*/,
+ Iterator* /*iterator*/) const override {}
+ const Value* GetIteratorValue(const Field* data, const Iterator* iterator,
+ Value* scratch_space) const override {
+ return Get(data, static_cast<int>(IteratorToPosition(iterator)),
+ scratch_space);
+ }
+
+ protected:
+ ~RandomAccessRepeatedFieldAccessor() = default;
+
+ private:
+ static intptr_t IteratorToPosition(const Iterator* iterator) {
+ return reinterpret_cast<intptr_t>(iterator);
+ }
+ static Iterator* PositionToIterator(intptr_t position) {
+ return reinterpret_cast<Iterator*>(position);
+ }
+};
+
+// Base class for RepeatedFieldAccessor implementations that manipulates
+// RepeatedField<T>.
+template <typename T>
+class RepeatedFieldWrapper : public RandomAccessRepeatedFieldAccessor {
+ public:
+ RepeatedFieldWrapper() {}
+ bool IsEmpty(const Field* data) const override {
+ return GetRepeatedField(data)->empty();
+ }
+ int Size(const Field* data) const override {
+ return GetRepeatedField(data)->size();
+ }
+ const Value* Get(const Field* data, int index,
+ Value* scratch_space) const override {
+ return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
+ }
+ void Clear(Field* data) const override {
+ MutableRepeatedField(data)->Clear();
+ }
+ void Set(Field* data, int index, const Value* value) const override {
+ MutableRepeatedField(data)->Set(index, ConvertToT(value));
+ }
+ void Add(Field* data, const Value* value) const override {
+ MutableRepeatedField(data)->Add(ConvertToT(value));
+ }
+ void RemoveLast(Field* data) const override {
+ MutableRepeatedField(data)->RemoveLast();
+ }
+ void SwapElements(Field* data, int index1, int index2) const override {
+ MutableRepeatedField(data)->SwapElements(index1, index2);
+ }
+
+ protected:
+ ~RepeatedFieldWrapper() = default;
+ typedef RepeatedField<T> RepeatedFieldType;
+ static const RepeatedFieldType* GetRepeatedField(const Field* data) {
+ return reinterpret_cast<const RepeatedFieldType*>(data);
+ }
+ static RepeatedFieldType* MutableRepeatedField(Field* data) {
+ return reinterpret_cast<RepeatedFieldType*>(data);
+ }
+
+ // Convert an object received by this accessor to an object to be stored in
+ // the underlying RepeatedField.
+ virtual T ConvertToT(const Value* value) const = 0;
+
+ // Convert an object stored in RepeatedPtrField to an object that will be
+ // returned by this accessor. If the two objects have the same type (true for
+ // string fields with ctype=STRING), a pointer to the source object can be
+ // returned directly. Otherwise, data should be copied from value to
+ // scratch_space and scratch_space should be returned.
+ virtual const Value* ConvertFromT(const T& value,
+ Value* scratch_space) const = 0;
+};
+
+// Base class for RepeatedFieldAccessor implementations that manipulates
+// RepeatedPtrField<T>.
+template <typename T>
+class RepeatedPtrFieldWrapper : public RandomAccessRepeatedFieldAccessor {
+ public:
+ bool IsEmpty(const Field* data) const override {
+ return GetRepeatedField(data)->empty();
+ }
+ int Size(const Field* data) const override {
+ return GetRepeatedField(data)->size();
+ }
+ const Value* Get(const Field* data, int index,
+ Value* scratch_space) const override {
+ return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
+ }
+ void Clear(Field* data) const override {
+ MutableRepeatedField(data)->Clear();
+ }
+ void Set(Field* data, int index, const Value* value) const override {
+ ConvertToT(value, MutableRepeatedField(data)->Mutable(index));
+ }
+ void Add(Field* data, const Value* value) const override {
+ T* allocated = New(value);
+ ConvertToT(value, allocated);
+ MutableRepeatedField(data)->AddAllocated(allocated);
+ }
+ void RemoveLast(Field* data) const override {
+ MutableRepeatedField(data)->RemoveLast();
+ }
+ void SwapElements(Field* data, int index1, int index2) const override {
+ MutableRepeatedField(data)->SwapElements(index1, index2);
+ }
+
+ protected:
+ ~RepeatedPtrFieldWrapper() = default;
+ typedef RepeatedPtrField<T> RepeatedFieldType;
+ static const RepeatedFieldType* GetRepeatedField(const Field* data) {
+ return reinterpret_cast<const RepeatedFieldType*>(data);
+ }
+ static RepeatedFieldType* MutableRepeatedField(Field* data) {
+ return reinterpret_cast<RepeatedFieldType*>(data);
+ }
+
+ // Create a new T instance. For repeated message fields, T can be specified
+ // as google::protobuf::Message so we can't use "new T()" directly. In that case, value
+ // should be a message of the same type (it's ensured by the caller) and a
+ // new message object will be created using it.
+ virtual T* New(const Value* value) const = 0;
+
+ // Convert an object received by this accessor to an object that will be
+ // stored in the underlying RepeatedPtrField.
+ virtual void ConvertToT(const Value* value, T* result) const = 0;
+
+ // Convert an object stored in RepeatedPtrField to an object that will be
+ // returned by this accessor. If the two objects have the same type (true for
+ // string fields with ctype=STRING), a pointer to the source object can be
+ // returned directly. Otherwise, data should be copied from value to
+ // scratch_space and scratch_space should be returned.
+ virtual const Value* ConvertFromT(const T& value,
+ Value* scratch_space) const = 0;
+};
+
+// An implementation of RandomAccessRepeatedFieldAccessor that manipulates
+// MapFieldBase.
+class MapFieldAccessor final : public RandomAccessRepeatedFieldAccessor {
+ public:
+ MapFieldAccessor() {}
+ virtual ~MapFieldAccessor() {}
+ bool IsEmpty(const Field* data) const override {
+ return GetRepeatedField(data)->empty();
+ }
+ int Size(const Field* data) const override {
+ return GetRepeatedField(data)->size();
+ }
+ const Value* Get(const Field* data, int index,
+ Value* scratch_space) const override {
+ return ConvertFromEntry(GetRepeatedField(data)->Get(index), scratch_space);
+ }
+ void Clear(Field* data) const override {
+ MutableRepeatedField(data)->Clear();
+ }
+ void Set(Field* data, int index, const Value* value) const override {
+ ConvertToEntry(value, MutableRepeatedField(data)->Mutable(index));
+ }
+ void Add(Field* data, const Value* value) const override {
+ Message* allocated = New(value);
+ ConvertToEntry(value, allocated);
+ MutableRepeatedField(data)->AddAllocated(allocated);
+ }
+ void RemoveLast(Field* data) const override {
+ MutableRepeatedField(data)->RemoveLast();
+ }
+ void SwapElements(Field* data, int index1, int index2) const override {
+ MutableRepeatedField(data)->SwapElements(index1, index2);
+ }
+ void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
+ Field* other_data) const override {
+ GOOGLE_CHECK(this == other_mutator);
+ MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+ }
+
+ protected:
+ typedef RepeatedPtrField<Message> RepeatedFieldType;
+ static const RepeatedFieldType* GetRepeatedField(const Field* data) {
+ return reinterpret_cast<const RepeatedFieldType*>(
+ (&reinterpret_cast<const MapFieldBase*>(data)->GetRepeatedField()));
+ }
+ static RepeatedFieldType* MutableRepeatedField(Field* data) {
+ return reinterpret_cast<RepeatedFieldType*>(
+ reinterpret_cast<MapFieldBase*>(data)->MutableRepeatedField());
+ }
+ virtual Message* New(const Value* value) const {
+ return static_cast<const Message*>(value)->New();
+ }
+ // Convert an object received by this accessor to an MapEntry message to be
+ // stored in the underlying MapFieldBase.
+ virtual void ConvertToEntry(const Value* value, Message* result) const {
+ result->CopyFrom(*static_cast<const Message*>(value));
+ }
+ // Convert a MapEntry message stored in the underlying MapFieldBase to an
+ // object that will be returned by this accessor.
+ virtual const Value* ConvertFromEntry(const Message& value,
+ Value* /*scratch_space*/) const {
+ return static_cast<const Value*>(&value);
+ }
+};
+
+// Default implementations of RepeatedFieldAccessor for primitive types.
+template <typename T>
+class RepeatedFieldPrimitiveAccessor final : public RepeatedFieldWrapper<T> {
+ typedef void Field;
+ typedef void Value;
+ using RepeatedFieldWrapper<T>::MutableRepeatedField;
+
+ public:
+ RepeatedFieldPrimitiveAccessor() {}
+ void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
+ Field* other_data) const override {
+ // Currently RepeatedFieldPrimitiveAccessor is the only implementation of
+ // RepeatedFieldAccessor for primitive types. As we are using singletons
+ // for these accessors, here "other_mutator" must be "this".
+ GOOGLE_CHECK(this == other_mutator);
+ MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+ }
+
+ protected:
+ T ConvertToT(const Value* value) const override {
+ return *static_cast<const T*>(value);
+ }
+ const Value* ConvertFromT(const T& value,
+ Value* /*scratch_space*/) const override {
+ return static_cast<const Value*>(&value);
+ }
+};
+
+// Default implementation of RepeatedFieldAccessor for string fields with
+// ctype=STRING.
+class RepeatedPtrFieldStringAccessor final
+ : public RepeatedPtrFieldWrapper<std::string> {
+ typedef void Field;
+ typedef void Value;
+ using RepeatedFieldAccessor::Add;
+
+ public:
+ RepeatedPtrFieldStringAccessor() {}
+ void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
+ Field* other_data) const override {
+ if (this == other_mutator) {
+ MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+ } else {
+ RepeatedPtrField<std::string> tmp;
+ tmp.Swap(MutableRepeatedField(data));
+ int other_size = other_mutator->Size(other_data);
+ for (int i = 0; i < other_size; ++i) {
+ Add<std::string>(data, other_mutator->Get<std::string>(other_data, i));
+ }
+ int size = Size(data);
+ other_mutator->Clear(other_data);
+ for (int i = 0; i < size; ++i) {
+ other_mutator->Add<std::string>(other_data, tmp.Get(i));
+ }
+ }
+ }
+
+ protected:
+ std::string* New(const Value*) const override { return new std::string(); }
+ void ConvertToT(const Value* value, std::string* result) const override {
+ *result = *static_cast<const std::string*>(value);
+ }
+ const Value* ConvertFromT(const std::string& value,
+ Value* /*scratch_space*/) const override {
+ return static_cast<const Value*>(&value);
+ }
+};
+
+
+class RepeatedPtrFieldMessageAccessor final
+ : public RepeatedPtrFieldWrapper<Message> {
+ typedef void Field;
+ typedef void Value;
+
+ public:
+ RepeatedPtrFieldMessageAccessor() {}
+ void Swap(Field* data, const internal::RepeatedFieldAccessor* other_mutator,
+ Field* other_data) const override {
+ GOOGLE_CHECK(this == other_mutator);
+ MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+ }
+
+ protected:
+ Message* New(const Value* value) const override {
+ return static_cast<const Message*>(value)->New();
+ }
+ void ConvertToT(const Value* value, Message* result) const override {
+ result->CopyFrom(*static_cast<const Message*>(value));
+ }
+ const Value* ConvertFromT(const Message& value,
+ Value* /*scratch_space*/) const override {
+ return static_cast<const Value*>(&value);
+ }
+};
+} // namespace internal
+} // namespace protobuf
+} // namespace google
+
+#endif // GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__