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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_MAP_FIELD_H__
+#define GOOGLE_PROTOBUF_MAP_FIELD_H__
+
+#include <google/protobuf/stubs/atomicops.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/generated_message_reflection.h>
+#include <google/protobuf/map.h>
+#include <google/protobuf/map_entry.h>
+#include <google/protobuf/message.h>
+#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/unknown_field_set.h>
+
+
+namespace google {
+namespace protobuf {
+
+namespace internal {
+
+class ContendedMapCleanTest;
+class GeneratedMessageReflection;
+class MapFieldAccessor;
+
+// This class provides accesss to map field using reflection, which is the same
+// as those provided for RepeatedPtrField<Message>. It is used for internal
+// reflection implentation only. Users should never use this directly.
+class LIBPROTOBUF_EXPORT MapFieldBase {
+ public:
+  MapFieldBase()
+      : base_map_(NULL),
+        repeated_field_(NULL),
+        entry_descriptor_(NULL),
+        assign_descriptor_callback_(NULL),
+        state_(STATE_MODIFIED_MAP) {}
+  virtual ~MapFieldBase();
+
+  // Returns reference to internal repeated field. Data written using
+  // google::protobuf::Map's api prior to calling this function is guarantted to be
+  // included in repeated field.
+  const RepeatedPtrFieldBase& GetRepeatedField() const;
+
+  // Like above. Returns mutable pointer to the internal repeated field.
+  RepeatedPtrFieldBase* MutableRepeatedField();
+
+  // Returns the number of bytes used by the repeated field, excluding
+  // sizeof(*this)
+  int SpaceUsedExcludingSelf() const;
+
+ protected:
+  // Gets the size of space used by map field.
+  virtual int SpaceUsedExcludingSelfNoLock() const;
+
+  // Synchronizes the content in Map to RepeatedPtrField if there is any change
+  // to Map after last synchronization.
+  void SyncRepeatedFieldWithMap() const;
+  virtual void SyncRepeatedFieldWithMapNoLock() const;
+
+  // Synchronizes the content in RepeatedPtrField to Map if there is any change
+  // to RepeatedPtrField after last synchronization.
+  void SyncMapWithRepeatedField() const;
+  virtual void SyncMapWithRepeatedFieldNoLock() const {}
+
+  // Tells MapFieldBase that there is new change to Map.
+  void SetMapDirty();
+
+  // Tells MapFieldBase that there is new change to RepeatedPTrField.
+  void SetRepeatedDirty();
+
+  // Provides derived class the access to repeated field.
+  void* MutableRepeatedPtrField() const;
+
+  // Creates descriptor for only one time.
+  void InitMetadataOnce() const;
+
+  enum State {
+    STATE_MODIFIED_MAP = 0,       // map has newly added data that has not been
+                                  // synchronized to repeated field
+    STATE_MODIFIED_REPEATED = 1,  // repeated field has newly added data that
+                                  // has not been synchronized to map
+    CLEAN = 2,  // data in map and repeated field are same
+  };
+
+  mutable void* base_map_;
+  mutable RepeatedPtrField<Message>* repeated_field_;
+  // MapEntry can only be created from MapField. To create MapEntry, MapField
+  // needs to know its descriptor, because MapEntry is not generated class which
+  // cannot initialize its own descriptor by calling generated
+  // descriptor-assign-function. Thus, we need to register a callback to
+  // initialize MapEntry's descriptor.
+  const Descriptor** entry_descriptor_;
+  void (*assign_descriptor_callback_)();
+
+  mutable Mutex mutex_;  // The thread to synchronize map and repeated field
+                         // needs to get lock first;
+  mutable volatile Atomic32 state_;  // 0: STATE_MODIFIED_MAP
+                                     // 1: STATE_MODIFIED_REPEATED
+                                     // 2: CLEAN
+
+ private:
+  friend class ContendedMapCleanTest;
+  friend class GeneratedMessageReflection;
+  friend class MapFieldAccessor;
+};
+
+// This class provides accesss to map field using generated api. It is used for
+// internal generated message implentation only. Users should never use this
+// directly.
+template<typename Key, typename T,
+         FieldDescriptor::Type KeyProto,
+         FieldDescriptor::Type ValueProto, int default_enum_value = 0>
+class LIBPROTOBUF_EXPORT MapField : public MapFieldBase {
+  // Handlers for key/value's proto field type.
+  typedef MapProtoTypeHandler<KeyProto> KeyProtoHandler;
+  typedef MapProtoTypeHandler<ValueProto> ValueProtoHandler;
+
+  // Define key/value's internal stored type.
+  typedef typename KeyProtoHandler::CppType KeyHandlerCpp;
+  typedef typename ValueProtoHandler::CppType ValHandlerCpp;
+  static const bool kIsKeyMessage = KeyProtoHandler::kIsMessage;
+  static const bool kIsValMessage = ValueProtoHandler::kIsMessage;
+  typedef typename MapIf<kIsKeyMessage, Key, KeyHandlerCpp>::type KeyCpp;
+  typedef typename MapIf<kIsValMessage, T  , ValHandlerCpp>::type ValCpp;
+
+  // Handlers for key/value's internal stored type.
+  typedef MapCppTypeHandler<KeyCpp> KeyHandler;
+  typedef MapCppTypeHandler<ValCpp> ValHandler;
+
+  // Define message type for internal repeated field.
+  typedef MapEntry<Key, T, KeyProto, ValueProto, default_enum_value> EntryType;
+
+  // Enum needs to be handled differently from other types because it has
+  // different exposed type in google::protobuf::Map's api and repeated field's api. For
+  // details see the comment in the implementation of
+  // SyncMapWithRepeatedFieldNoLocki.
+  static const bool kIsValueEnum = ValueProtoHandler::kIsEnum;
+  typedef typename MapIf<kIsValueEnum, T, const T&>::type CastValueType;
+
+ public:
+  MapField();
+  // MapField doesn't own the default_entry, which means default_entry must
+  // outlive the lifetime of MapField.
+  MapField(const Message* default_entry);
+  ~MapField();
+
+  // Accessors
+  const Map<Key, T>& GetMap() const;
+  Map<Key, T>* MutableMap();
+
+  // Convenient methods for generated message implementation.
+  int size() const;
+  void Clear();
+  void MergeFrom(const MapField& other);
+  void Swap(MapField* other);
+
+  // Allocates metadata only if this MapField is part of a generated message.
+  void SetEntryDescriptor(const Descriptor** descriptor);
+  void SetAssignDescriptorCallback(void (*callback)());
+
+  // Set default enum value only for proto2 map field whose value is enum type.
+  void SetDefaultEnumValue();
+
+  // Used in the implementation of parsing. Caller should take the ownership.
+  EntryType* NewEntry() const;
+  // Used in the implementation of serializing enum value type. Caller should
+  // take the ownership.
+  EntryType* NewEnumEntryWrapper(const Key& key, const T t) const;
+  // Used in the implementation of serializing other value types. Caller should
+  // take the ownership.
+  EntryType* NewEntryWrapper(const Key& key, const T& t) const;
+
+ private:
+  // MapField needs MapEntry's default instance to create new MapEntry.
+  void InitDefaultEntryOnce() const;
+
+  // Convenient methods to get internal google::protobuf::Map
+  const Map<Key, T>& GetInternalMap() const;
+  Map<Key, T>* MutableInternalMap();
+
+  // Implements MapFieldBase
+  void SyncRepeatedFieldWithMapNoLock() const;
+  void SyncMapWithRepeatedFieldNoLock() const;
+  int SpaceUsedExcludingSelfNoLock() const;
+
+  mutable const EntryType* default_entry_;
+};
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_MAP_FIELD_H__