src/google/protobuf/compiler/javanano/javanano_message_field.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 <map>
#include <string>

#include <google/protobuf/compiler/javanano/javanano_message_field.h>
#include <google/protobuf/compiler/javanano/javanano_helpers.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/wire_format.h>
#include <google/protobuf/stubs/strutil.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace javanano {

using internal::WireFormat;
using internal::WireFormatLite;

namespace {

// TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
//   repeat code between this and the other field types.
void SetMessageVariables(const Params& params,
    const FieldDescriptor* descriptor, map<string, string>* variables) {
  (*variables)["name"] =
    UnderscoresToCamelCase(descriptor);
  (*variables)["capitalized_name"] =
    UnderscoresToCapitalizedCamelCase(descriptor);
  (*variables)["number"] = SimpleItoa(descriptor->number());
  (*variables)["type"] = ClassName(params, descriptor->message_type());
  (*variables)["group_or_message"] =
    (descriptor->type() == FieldDescriptor::TYPE_GROUP) ?
    "Group" : "Message";
  (*variables)["message_name"] = descriptor->containing_type()->name();
  //(*variables)["message_type"] = descriptor->message_type()->name();
  (*variables)["tag"] = SimpleItoa(WireFormat::MakeTag(descriptor));
}

}  // namespace

// ===================================================================

MessageFieldGenerator::
MessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
  : FieldGenerator(params), descriptor_(descriptor) {
  SetMessageVariables(params, descriptor, &variables_);
}

MessageFieldGenerator::~MessageFieldGenerator() {}

void MessageFieldGenerator::
GenerateMembers(io::Printer* printer) const {
  printer->Print(variables_,
    "public $type$ $name$ = null;\n");
}

void MessageFieldGenerator::
GenerateMergingCode(io::Printer* printer) const {
  printer->Print(variables_,
    "if (other.$name$ != null) {\n"
    "  merge$capitalized_name$(other.$name$);\n"
    "}\n");
}

void MessageFieldGenerator::
GenerateParsingCode(io::Printer* printer) const {
  printer->Print(variables_,
    "$name$ = new $type$();\n");

  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
    printer->Print(variables_,
      "input.readGroup($name$, $number$);\n");
  } else {
    printer->Print(variables_,
      "input.readMessage($name$);\n");
  }
}

void MessageFieldGenerator::
GenerateSerializationCode(io::Printer* printer) const {
  printer->Print(variables_,
    "if ($name$ != null) {\n"
    "  output.write$group_or_message$($number$, $name$);\n"
    "}\n");
}

void MessageFieldGenerator::
GenerateSerializedSizeCode(io::Printer* printer) const {
  printer->Print(variables_,
    "if ($name$ != null) {\n"
    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
    "    .compute$group_or_message$Size($number$, $name$);\n"
    "}\n");
}

string MessageFieldGenerator::GetBoxedType() const {
  return ClassName(params_, descriptor_->message_type());
}

// ===================================================================

RepeatedMessageFieldGenerator::
RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
  : FieldGenerator(params), descriptor_(descriptor) {
  SetMessageVariables(params, descriptor, &variables_);
}

RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}

void RepeatedMessageFieldGenerator::
GenerateMembers(io::Printer* printer) const {
  printer->Print(variables_,
    "public $type$[] $name$ = $type$.EMPTY_ARRAY;\n");
}

void RepeatedMessageFieldGenerator::
GenerateMergingCode(io::Printer* printer) const {
  printer->Print(variables_,
    "if (other.$name$.length > 0) {\n"
    "  $type$[] merged = java.util.Arrays.copyOf(result.$name$, result.$name$.length + other.$name$.length);\n"
    "  java.lang.System.arraycopy(other.$name$, 0, merged, results.$name$.length, other.$name$.length);\n"
    "  result.$name$ = merged;\n"
    "}\n");
}

void RepeatedMessageFieldGenerator::
GenerateParsingCode(io::Printer* printer) const {
  // First, figure out the length of the array, then parse.
  printer->Print(variables_,
    "int arrayLength = com.google.protobuf.nano.WireFormatNano.getRepeatedFieldArrayLength(input, $tag$);\n"
    "int i = $name$.length;\n"
    "$name$ = java.util.Arrays.copyOf($name$, i + arrayLength);\n"
    "for (; i < $name$.length - 1; i++) {\n"
    "  $name$[i] = new $type$();\n");

  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
    printer->Print(variables_,
      "  input.readGroup($name$[i], $number$);\n");
  } else {
    printer->Print(variables_,
      "  input.readMessage($name$[i]);\n");
  }

  printer->Print(variables_,
    "  input.readTag();\n"
    "}\n"
    "// Last one without readTag.\n"
    "$name$[i] = new $type$();\n");

  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
    printer->Print(variables_,
      "input.readGroup($name$[i], $number$);\n");
  } else {
    printer->Print(variables_,
      "input.readMessage($name$[i]);\n");
  }
}

void RepeatedMessageFieldGenerator::
GenerateSerializationCode(io::Printer* printer) const {
  printer->Print(variables_,
    "for ($type$ element : $name$) {\n"
    "  output.write$group_or_message$($number$, element);\n"
    "}\n");
}

void RepeatedMessageFieldGenerator::
GenerateSerializedSizeCode(io::Printer* printer) const {
  printer->Print(variables_,
    "for ($type$ element : $name$) {\n"
    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
    "    .compute$group_or_message$Size($number$, element);\n"
    "}\n");
}

string RepeatedMessageFieldGenerator::GetBoxedType() const {
  return ClassName(params_, descriptor_->message_type());
}

}  // namespace javanano
}  // namespace compiler
}  // namespace protobuf
}  // namespace google