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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// 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.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
+#define GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
+
+#include <map>
+#include <string>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/descriptor.h>
+
+namespace google {
+namespace protobuf {
+  namespace io {
+    class Printer;             // printer.h
+  }
+}
+
+namespace protobuf {
+namespace compiler {
+namespace cpp {
+
+// Helper function: set variables in the map that are the same for all
+// field code generators.
+// ['name', 'index', 'number', 'classname', 'declared_type', 'tag_size',
+// 'deprecation'].
+void SetCommonFieldVariables(const FieldDescriptor* descriptor,
+                             map<string, string>* variables);
+
+class FieldGenerator {
+ public:
+  FieldGenerator() {}
+  virtual ~FieldGenerator();
+
+  // Generate lines of code declaring members fields of the message class
+  // needed to represent this field.  These are placed inside the message
+  // class.
+  virtual void GeneratePrivateMembers(io::Printer* printer) const = 0;
+
+  // Generate prototypes for all of the accessor functions related to this
+  // field.  These are placed inside the class definition.
+  virtual void GenerateAccessorDeclarations(io::Printer* printer) const = 0;
+
+  // Generate inline definitions of accessor functions for this field.
+  // These are placed inside the header after all class definitions.
+  virtual void GenerateInlineAccessorDefinitions(
+    io::Printer* printer) const = 0;
+
+  // Generate definitions of accessors that aren't inlined.  These are
+  // placed somewhere in the .cc file.
+  // Most field types don't need this, so the default implementation is empty.
+  virtual void GenerateNonInlineAccessorDefinitions(
+    io::Printer* printer) const {}
+
+  // Generate lines of code (statements, not declarations) which clear the
+  // field.  This is used to define the clear_$name$() method as well as
+  // the Clear() method for the whole message.
+  virtual void GenerateClearingCode(io::Printer* printer) const = 0;
+
+  // Generate lines of code (statements, not declarations) which merges the
+  // contents of the field from the current message to the target message,
+  // which is stored in the generated code variable "from".
+  // This is used to fill in the MergeFrom method for the whole message.
+  // Details of this usage can be found in message.cc under the
+  // GenerateMergeFrom method.
+  virtual void GenerateMergingCode(io::Printer* printer) const = 0;
+
+  // Generate lines of code (statements, not declarations) which swaps
+  // this field and the corresponding field of another message, which
+  // is stored in the generated code variable "other". This is used to
+  // define the Swap method. Details of usage can be found in
+  // message.cc under the GenerateSwap method.
+  virtual void GenerateSwappingCode(io::Printer* printer) const = 0;
+
+  // Generate initialization code for private members declared by
+  // GeneratePrivateMembers(). These go into the message class's SharedCtor()
+  // method, invoked by each of the generated constructors.
+  virtual void GenerateConstructorCode(io::Printer* printer) const = 0;
+
+  // Generate any code that needs to go in the class's SharedDtor() method,
+  // invoked by the destructor.
+  // Most field types don't need this, so the default implementation is empty.
+  virtual void GenerateDestructorCode(io::Printer* printer) const {}
+
+  // Generate lines to decode this field, which will be placed inside the
+  // message's MergeFromCodedStream() method.
+  virtual void GenerateMergeFromCodedStream(io::Printer* printer) const = 0;
+
+  // Generate lines to serialize this field, which are placed within the
+  // message's SerializeWithCachedSizes() method.
+  virtual void GenerateSerializeWithCachedSizes(io::Printer* printer) const = 0;
+
+  // Generate lines to serialize this field directly to the array "target",
+  // which are placed within the message's SerializeWithCachedSizesToArray()
+  // method. This must also advance "target" past the written bytes.
+  virtual void GenerateSerializeWithCachedSizesToArray(
+      io::Printer* printer) const = 0;
+
+  // Generate lines to compute the serialized size of this field, which
+  // are placed in the message's ByteSize() method.
+  virtual void GenerateByteSize(io::Printer* printer) const = 0;
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
+};
+
+// Convenience class which constructs FieldGenerators for a Descriptor.
+class FieldGeneratorMap {
+ public:
+  explicit FieldGeneratorMap(const Descriptor* descriptor);
+  ~FieldGeneratorMap();
+
+  const FieldGenerator& get(const FieldDescriptor* field) const;
+
+ private:
+  const Descriptor* descriptor_;
+  scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
+
+  static FieldGenerator* MakeGenerator(const FieldDescriptor* field);
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
+};
+
+}  // namespace cpp
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__