Source

protobuf / src / google / protobuf / compiler / java / java_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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//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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//
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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_field.h>
#include <google/protobuf/compiler/java/java_helpers.h>
#include <google/protobuf/compiler/java/java_primitive_field.h>
#include <google/protobuf/compiler/java/java_enum_field.h>
#include <google/protobuf/compiler/java/java_message_field.h>
#include <google/protobuf/compiler/java/java_string_field.h>
#include <google/protobuf/stubs/common.h>

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

FieldGenerator::~FieldGenerator() {}

void FieldGenerator::GenerateParsingCodeFromPacked(io::Printer* printer) const {
  // Reaching here indicates a bug. Cases are:
  //   - This FieldGenerator should support packing, but this method should be
  //     overridden.
  //   - This FieldGenerator doesn't support packing, and this method should
  //     never have been called.
  GOOGLE_LOG(FATAL) << "GenerateParsingCodeFromPacked() "
             << "called on field generator that does not support packing.";
}

FieldGeneratorMap::FieldGeneratorMap(const Descriptor* descriptor)
  : descriptor_(descriptor),
    field_generators_(
      new scoped_ptr<FieldGenerator>[descriptor->field_count()]),
    extension_generators_(
      new scoped_ptr<FieldGenerator>[descriptor->extension_count()]) {

  // Construct all the FieldGenerators and assign them bit indices for their
  // bit fields.
  int messageBitIndex = 0;
  int builderBitIndex = 0;
  for (int i = 0; i < descriptor->field_count(); i++) {
    FieldGenerator* generator = MakeGenerator(descriptor->field(i),
        messageBitIndex, builderBitIndex);
    field_generators_[i].reset(generator);
    messageBitIndex += generator->GetNumBitsForMessage();
    builderBitIndex += generator->GetNumBitsForBuilder();
  }
  for (int i = 0; i < descriptor->extension_count(); i++) {
    FieldGenerator* generator = MakeGenerator(descriptor->extension(i),
        messageBitIndex, builderBitIndex);
    extension_generators_[i].reset(generator);
    messageBitIndex += generator->GetNumBitsForMessage();
    builderBitIndex += generator->GetNumBitsForBuilder();
  }
}

FieldGenerator* FieldGeneratorMap::MakeGenerator(
    const FieldDescriptor* field, int messageBitIndex, int builderBitIndex) {
  if (field->is_repeated()) {
    switch (GetJavaType(field)) {
      case JAVATYPE_MESSAGE:
        return new RepeatedMessageFieldGenerator(
            field, messageBitIndex, builderBitIndex);
      case JAVATYPE_ENUM:
        return new RepeatedEnumFieldGenerator(
            field, messageBitIndex, builderBitIndex);
      case JAVATYPE_STRING:
        return new RepeatedStringFieldGenerator(
            field, messageBitIndex, builderBitIndex);
      default:
        return new RepeatedPrimitiveFieldGenerator(
            field, messageBitIndex, builderBitIndex);
    }
  } else {
    switch (GetJavaType(field)) {
      case JAVATYPE_MESSAGE:
        return new MessageFieldGenerator(
            field, messageBitIndex, builderBitIndex);
      case JAVATYPE_ENUM:
        return new EnumFieldGenerator(
            field, messageBitIndex, builderBitIndex);
      case JAVATYPE_STRING:
        return new StringFieldGenerator(
            field, messageBitIndex, builderBitIndex);
      default:
        return new PrimitiveFieldGenerator(
            field, messageBitIndex, builderBitIndex);
    }
  }
}

FieldGeneratorMap::~FieldGeneratorMap() {}

const FieldGenerator& FieldGeneratorMap::get(
    const FieldDescriptor* field) const {
  GOOGLE_CHECK_EQ(field->containing_type(), descriptor_);
  return *field_generators_[field->index()];
}

const FieldGenerator& FieldGeneratorMap::get_extension(int index) const {
  return *extension_generators_[index];
}

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