src/google/protobuf/compiler/java/java_generator.cc

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://code.google.com/p/protobuf/
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// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#include <google/protobuf/compiler/java/java_generator.h>
#include <google/protobuf/compiler/java/java_file.h>
#include <google/protobuf/compiler/java/java_helpers.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/stubs/strutil.h>

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


JavaGenerator::JavaGenerator() {}
JavaGenerator::~JavaGenerator() {}

bool JavaGenerator::Generate(const FileDescriptor* file,
                             const string& parameter,
                             GeneratorContext* context,
                             string* error) const {
  // -----------------------------------------------------------------
  // parse generator options

  // Name a file where we will write a list of generated file names, one
  // per line.
  string output_list_file;


  vector<pair<string, string> > options;
  ParseGeneratorParameter(parameter, &options);

  for (int i = 0; i < options.size(); i++) {
    if (options[i].first == "output_list_file") {
      output_list_file = options[i].second;
    } else {
      *error = "Unknown generator option: " + options[i].first;
      return false;
    }
  }

  // -----------------------------------------------------------------


  if (file->options().optimize_for() == FileOptions::LITE_RUNTIME &&
      file->options().java_generate_equals_and_hash()) {
    *error = "The \"java_generate_equals_and_hash\" option is incompatible "
             "with \"optimize_for = LITE_RUNTIME\".  You must optimize for "
             "SPEED or CODE_SIZE if you want to use this option.";
    return false;
  }

  FileGenerator file_generator(file);
  if (!file_generator.Validate(error)) {
    return false;
  }

  string package_dir = JavaPackageToDir(file_generator.java_package());

  vector<string> all_files;

  string java_filename = package_dir;
  java_filename += file_generator.classname();
  java_filename += ".java";
  all_files.push_back(java_filename);

  // Generate main java file.
  scoped_ptr<io::ZeroCopyOutputStream> output(
    context->Open(java_filename));
  io::Printer printer(output.get(), '$');
  file_generator.Generate(&printer);

  // Generate sibling files.
  file_generator.GenerateSiblings(package_dir, context, &all_files);

  // Generate output list if requested.
  if (!output_list_file.empty()) {
    // Generate output list.  This is just a simple text file placed in a
    // deterministic location which lists the .java files being generated.
    scoped_ptr<io::ZeroCopyOutputStream> srclist_raw_output(
      context->Open(output_list_file));
    io::Printer srclist_printer(srclist_raw_output.get(), '$');
    for (int i = 0; i < all_files.size(); i++) {
      srclist_printer.Print("$filename$\n", "filename", all_files[i]);
    }
  }

  return true;
}

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