// 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.

#ifndef GOOGLE_PROTOBUF_COMPILER_JAVA_SERVICE_H__
#define GOOGLE_PROTOBUF_COMPILER_JAVA_SERVICE_H__

#include "google/protobuf/descriptor.h"

namespace google {
namespace protobuf {
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 {

class ServiceGenerator {
 public:
  explicit ServiceGenerator(const ServiceDescriptor* descriptor);
  ServiceGenerator(const ServiceGenerator&) = delete;
  ServiceGenerator& operator=(const ServiceGenerator&) = delete;
  virtual ~ServiceGenerator();

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

  enum RequestOrResponse { REQUEST, RESPONSE };
  enum IsAbstract { IS_ABSTRACT, IS_CONCRETE };

 protected:
  const ServiceDescriptor* descriptor_;
};

class ImmutableServiceGenerator : public ServiceGenerator {
 public:
  ImmutableServiceGenerator(const ServiceDescriptor* descriptor,
                            Context* context);
  ImmutableServiceGenerator(const ImmutableServiceGenerator&) = delete;
  ImmutableServiceGenerator& operator=(const ImmutableServiceGenerator&) =
      delete;
  ~ImmutableServiceGenerator() override;

  void Generate(io::Printer* printer) override;

 private:
  // Generate the getDescriptorForType() method.
  void GenerateGetDescriptorForType(io::Printer* printer);

  // Generate a Java interface for the service.
  void GenerateInterface(io::Printer* printer);

  // Generate newReflectiveService() method.
  void GenerateNewReflectiveServiceMethod(io::Printer* printer);

  // Generate newReflectiveBlockingService() method.
  void GenerateNewReflectiveBlockingServiceMethod(io::Printer* printer);

  // Generate abstract method declarations for all methods.
  void GenerateAbstractMethods(io::Printer* printer);

  // Generate the implementation of Service.callMethod().
  void GenerateCallMethod(io::Printer* printer);

  // Generate the implementation of BlockingService.callBlockingMethod().
  void GenerateCallBlockingMethod(io::Printer* printer);

  // Generate the implementations of Service.get{Request,Response}Prototype().
  void GenerateGetPrototype(RequestOrResponse which, io::Printer* printer);

  // Generate a stub implementation of the service.
  void GenerateStub(io::Printer* printer);

  // Generate a method signature, possibly abstract, without body or trailing
  // semicolon.
  void GenerateMethodSignature(io::Printer* printer,
                               const MethodDescriptor* method,
                               IsAbstract is_abstract);

  // Generate a blocking stub interface and implementation of the service.
  void GenerateBlockingStub(io::Printer* printer);

  // Generate the method signature for one method of a blocking stub.
  void GenerateBlockingMethodSignature(io::Printer* printer,
                                       const MethodDescriptor* method);

  // Return the output type of the method.
  std::string GetOutput(const MethodDescriptor* method);

  Context* context_;
  ClassNameResolver* name_resolver_;
};

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

#endif  // NET_PROTO2_COMPILER_JAVA_SERVICE_H__