src/google/protobuf/compiler/java/extension.h

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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//
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// notice, this list of conditions and the following disclaimer.
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// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
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// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#ifndef GOOGLE_PROTOBUF_COMPILER_JAVA_EXTENSION_H__
#define GOOGLE_PROTOBUF_COMPILER_JAVA_EXTENSION_H__

#include <map>
#include <string>

#include <google/protobuf/stubs/common.h>

namespace google {
namespace protobuf {
class FieldDescriptor;  // descriptor.h
namespace compiler {
namespace java {
class Context;            // context.h
class ClassNameResolver;  // name_resolver.h
}  // namespace java
}  // namespace compiler
namespace io {
class Printer;  // printer.h
}
}  // namespace protobuf
}  // namespace google

namespace google {
namespace protobuf {
namespace compiler {
namespace java {

// Generates code for an extension, which may be within the scope of some
// message or may be at file scope.  This is much simpler than FieldGenerator
// since extensions are just simple identifiers with interesting types.
class ExtensionGenerator {
 public:
  explicit ExtensionGenerator() {}
  virtual ~ExtensionGenerator() {}

  virtual void Generate(io::Printer* printer) = 0;

  // Returns an estimate of the number of bytes the printed code will compile
  // to
  virtual int GenerateNonNestedInitializationCode(io::Printer* printer) = 0;

  // Returns an estimate of the number of bytes the printed code will compile
  // to
  virtual int GenerateRegistrationCode(io::Printer* printer) = 0;

 protected:
  static void InitTemplateVars(
      const FieldDescriptor* descriptor, const std::string& scope,
      bool immutable, ClassNameResolver* name_resolver,
      std::map<std::string, std::string>* vars_pointer);

 private:
  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ExtensionGenerator);
};

class ImmutableExtensionGenerator : public ExtensionGenerator {
 public:
  explicit ImmutableExtensionGenerator(const FieldDescriptor* descriptor,
                                       Context* context);
  ~ImmutableExtensionGenerator() override;

  void Generate(io::Printer* printer) override;
  int GenerateNonNestedInitializationCode(io::Printer* printer) override;
  int GenerateRegistrationCode(io::Printer* printer) override;

 protected:
  const FieldDescriptor* descriptor_;
  ClassNameResolver* name_resolver_;
  std::string scope_;

 private:
  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImmutableExtensionGenerator);
};

}  // namespace java
}  // namespace compiler
}  // namespace protobuf
}  // namespace google

#endif  // GOOGLE_PROTOBUF_COMPILER_JAVA_EXTENSION_H__