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Diffstat (limited to 'third_party/protobuf/3.4.0/src/google/protobuf/dynamic_message.h')
| -rw-r--r-- | third_party/protobuf/3.4.0/src/google/protobuf/dynamic_message.h | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/third_party/protobuf/3.4.0/src/google/protobuf/dynamic_message.h b/third_party/protobuf/3.4.0/src/google/protobuf/dynamic_message.h new file mode 100644 index 0000000000..e29b148d6a --- /dev/null +++ b/third_party/protobuf/3.4.0/src/google/protobuf/dynamic_message.h @@ -0,0 +1,236 @@ +// 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. + +// Author: kenton@google.com (Kenton Varda) +// Based on original Protocol Buffers design by +// Sanjay Ghemawat, Jeff Dean, and others. +// +// Defines an implementation of Message which can emulate types which are not +// known at compile-time. + +#ifndef GOOGLE_PROTOBUF_DYNAMIC_MESSAGE_H__ +#define GOOGLE_PROTOBUF_DYNAMIC_MESSAGE_H__ + +#include <algorithm> +#include <memory> +#ifndef _SHARED_PTR_H +#include <google/protobuf/stubs/shared_ptr.h> +#endif +#include <vector> + +#include <google/protobuf/message.h> +#include <google/protobuf/repeated_field.h> +#include <google/protobuf/stubs/common.h> +#include <google/protobuf/stubs/mutex.h> + +namespace google { +namespace protobuf { + +// Defined in other files. +class Descriptor; // descriptor.h +class DescriptorPool; // descriptor.h + +// Constructs implementations of Message which can emulate types which are not +// known at compile-time. +// +// Sometimes you want to be able to manipulate protocol types that you don't +// know about at compile time. It would be nice to be able to construct +// a Message object which implements the message type given by any arbitrary +// Descriptor. DynamicMessage provides this. +// +// As it turns out, a DynamicMessage needs to construct extra +// information about its type in order to operate. Most of this information +// can be shared between all DynamicMessages of the same type. But, caching +// this information in some sort of global map would be a bad idea, since +// the cached information for a particular descriptor could outlive the +// descriptor itself. To avoid this problem, DynamicMessageFactory +// encapsulates this "cache". All DynamicMessages of the same type created +// from the same factory will share the same support data. Any Descriptors +// used with a particular factory must outlive the factory. +class LIBPROTOBUF_EXPORT DynamicMessageFactory : public MessageFactory { + public: + // Construct a DynamicMessageFactory that will search for extensions in + // the DescriptorPool in which the extendee is defined. + DynamicMessageFactory(); + + // Construct a DynamicMessageFactory that will search for extensions in + // the given DescriptorPool. + // + // DEPRECATED: Use CodedInputStream::SetExtensionRegistry() to tell the + // parser to look for extensions in an alternate pool. However, note that + // this is almost never what you want to do. Almost all users should use + // the zero-arg constructor. + DynamicMessageFactory(const DescriptorPool* pool); + + ~DynamicMessageFactory(); + + // Call this to tell the DynamicMessageFactory that if it is given a + // Descriptor d for which: + // d->file()->pool() == DescriptorPool::generated_pool(), + // then it should delegate to MessageFactory::generated_factory() instead + // of constructing a dynamic implementation of the message. In theory there + // is no down side to doing this, so it may become the default in the future. + void SetDelegateToGeneratedFactory(bool enable) { + delegate_to_generated_factory_ = enable; + } + + // implements MessageFactory --------------------------------------- + + // Given a Descriptor, constructs the default (prototype) Message of that + // type. You can then call that message's New() method to construct a + // mutable message of that type. + // + // Calling this method twice with the same Descriptor returns the same + // object. The returned object remains property of the factory and will + // be destroyed when the factory is destroyed. Also, any objects created + // by calling the prototype's New() method share some data with the + // prototype, so these must be destroyed before the DynamicMessageFactory + // is destroyed. + // + // The given descriptor must outlive the returned message, and hence must + // outlive the DynamicMessageFactory. + // + // The method is thread-safe. + const Message* GetPrototype(const Descriptor* type); + + private: + const DescriptorPool* pool_; + bool delegate_to_generated_factory_; + + // This struct just contains a hash_map. We can't #include <google/protobuf/stubs/hash.h> from + // this header due to hacks needed for hash_map portability in the open source + // release. Namely, stubs/hash.h, which defines hash_map portably, is not a + // public header (for good reason), but dynamic_message.h is, and public + // headers may only #include other public headers. + struct PrototypeMap; + google::protobuf::scoped_ptr<PrototypeMap> prototypes_; + mutable Mutex prototypes_mutex_; + + friend class DynamicMessage; + const Message* GetPrototypeNoLock(const Descriptor* type); + + // Construct default oneof instance for reflection usage if oneof + // is defined. + static void ConstructDefaultOneofInstance(const Descriptor* type, + const uint32 offsets[], + void* default_oneof_instance); + // Delete default oneof instance. Called by ~DynamicMessageFactory. + static void DeleteDefaultOneofInstance(const Descriptor* type, + const uint32 offsets[], + const void* default_oneof_instance); + + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DynamicMessageFactory); +}; + +// Helper for computing a sorted list of map entries via reflection. +class LIBPROTOBUF_EXPORT DynamicMapSorter { + public: + static std::vector<const Message*> Sort(const Message& message, + int map_size, + const Reflection* reflection, + const FieldDescriptor* field) { + std::vector<const Message*> result(static_cast<size_t>(map_size)); + const RepeatedPtrField<Message>& map_field = + reflection->GetRepeatedPtrField<Message>(message, field); + size_t i = 0; + for (RepeatedPtrField<Message>::const_pointer_iterator it = + map_field.pointer_begin(); it != map_field.pointer_end(); ) { + result[i++] = *it++; + } + GOOGLE_DCHECK_EQ(result.size(), i); + MapEntryMessageComparator comparator(field->message_type()); + std::stable_sort(result.begin(), result.end(), comparator); + // Complain if the keys aren't in ascending order. +#ifndef NDEBUG + for (size_t j = 1; j < static_cast<size_t>(map_size); j++) { + if (!comparator(result[j - 1], result[j])) { + GOOGLE_LOG(ERROR) << (comparator(result[j], result[j - 1]) ? + "internal error in map key sorting" : + "map keys are not unique"); + } + } +#endif + return result; + } + + private: + class LIBPROTOBUF_EXPORT MapEntryMessageComparator { + public: + explicit MapEntryMessageComparator(const Descriptor* descriptor) + : field_(descriptor->field(0)) {} + + bool operator()(const Message* a, const Message* b) { + const Reflection* reflection = a->GetReflection(); + switch (field_->cpp_type()) { + case FieldDescriptor::CPPTYPE_BOOL: { + bool first = reflection->GetBool(*a, field_); + bool second = reflection->GetBool(*b, field_); + return first < second; + } + case FieldDescriptor::CPPTYPE_INT32: { + int32 first = reflection->GetInt32(*a, field_); + int32 second = reflection->GetInt32(*b, field_); + return first < second; + } + case FieldDescriptor::CPPTYPE_INT64: { + int64 first = reflection->GetInt64(*a, field_); + int64 second = reflection->GetInt64(*b, field_); + return first < second; + } + case FieldDescriptor::CPPTYPE_UINT32: { + uint32 first = reflection->GetUInt32(*a, field_); + uint32 second = reflection->GetUInt32(*b, field_); + return first < second; + } + case FieldDescriptor::CPPTYPE_UINT64: { + uint64 first = reflection->GetUInt64(*a, field_); + uint64 second = reflection->GetUInt64(*b, field_); + return first < second; + } + case FieldDescriptor::CPPTYPE_STRING: { + string first = reflection->GetString(*a, field_); + string second = reflection->GetString(*b, field_); + return first < second; + } + default: + GOOGLE_LOG(DFATAL) << "Invalid key for map field."; + return true; + } + } + + private: + const FieldDescriptor* field_; + }; +}; + +} // namespace protobuf + +} // namespace google +#endif // GOOGLE_PROTOBUF_DYNAMIC_MESSAGE_H__ |