// 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.

#include <map>
#include <string>

#include <google/protobuf/stubs/logging.h>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/compiler/java/java_context.h>
#include <google/protobuf/compiler/java/java_doc_comment.h>
#include <google/protobuf/compiler/java/java_enum_field.h>
#include <google/protobuf/compiler/java/java_helpers.h>
#include <google/protobuf/compiler/java/java_name_resolver.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 java {

namespace {

void SetEnumVariables(const FieldDescriptor* descriptor, int messageBitIndex,
                      int builderBitIndex, const FieldGeneratorInfo* info,
                      ClassNameResolver* name_resolver,
                      std::map<std::string, std::string>* variables) {
  SetCommonFieldVariables(descriptor, info, variables);

  (*variables)["type"] =
      name_resolver->GetImmutableClassName(descriptor->enum_type());
  (*variables)["mutable_type"] =
      name_resolver->GetMutableClassName(descriptor->enum_type());
  (*variables)["default"] = ImmutableDefaultValue(descriptor, name_resolver);
  (*variables)["default_number"] =
      StrCat(descriptor->default_value_enum()->number());
  (*variables)["tag"] = StrCat(
      static_cast<int32>(internal::WireFormat::MakeTag(descriptor)));
  (*variables)["tag_size"] = StrCat(
      internal::WireFormat::TagSize(descriptor->number(), GetType(descriptor)));
  // TODO(birdo): Add @deprecated javadoc when generating javadoc is supported
  // by the proto compiler
  (*variables)["deprecation"] =
      descriptor->options().deprecated() ? "@java.lang.Deprecated " : "";
  (*variables)["on_changed"] = "onChanged();";
  // Use deprecated valueOf() method to be compatible with old generated code
  // for v2.5.0/v2.6.1.
  // TODO(xiaofeng): Use "forNumber" when we no longer support compatibility
  // with v2.5.0/v2.6.1, and remove the @SuppressWarnings annotations.
  (*variables)["for_number"] = "valueOf";

  if (SupportFieldPresence(descriptor->file())) {
    // For singular messages and builders, one bit is used for the hasField bit.
    (*variables)["get_has_field_bit_message"] = GenerateGetBit(messageBitIndex);
    (*variables)["get_has_field_bit_builder"] = GenerateGetBit(builderBitIndex);

    // Note that these have a trailing ";".
    (*variables)["set_has_field_bit_message"] =
        GenerateSetBit(messageBitIndex) + ";";
    (*variables)["set_has_field_bit_builder"] =
        GenerateSetBit(builderBitIndex) + ";";
    (*variables)["clear_has_field_bit_builder"] =
        GenerateClearBit(builderBitIndex) + ";";

    (*variables)["is_field_present_message"] = GenerateGetBit(messageBitIndex);
  } else {
    (*variables)["set_has_field_bit_message"] = "";
    (*variables)["set_has_field_bit_builder"] = "";
    (*variables)["clear_has_field_bit_builder"] = "";

    (*variables)["is_field_present_message"] =
        (*variables)["name"] + "_ != " + (*variables)["default"] +
        ".getNumber()";
  }

  // For repated builders, one bit is used for whether the array is immutable.
  (*variables)["get_mutable_bit_builder"] = GenerateGetBit(builderBitIndex);
  (*variables)["set_mutable_bit_builder"] = GenerateSetBit(builderBitIndex);
  (*variables)["clear_mutable_bit_builder"] = GenerateClearBit(builderBitIndex);

  // For repeated fields, one bit is used for whether the array is immutable
  // in the parsing constructor.
  (*variables)["get_mutable_bit_parser"] =
      GenerateGetBitMutableLocal(builderBitIndex);
  (*variables)["set_mutable_bit_parser"] =
      GenerateSetBitMutableLocal(builderBitIndex);

  (*variables)["get_has_field_bit_from_local"] =
      GenerateGetBitFromLocal(builderBitIndex);
  (*variables)["set_has_field_bit_to_local"] =
      GenerateSetBitToLocal(messageBitIndex);

  if (SupportUnknownEnumValue(descriptor->file())) {
    (*variables)["unknown"] = (*variables)["type"] + ".UNRECOGNIZED";
  } else {
    (*variables)["unknown"] = (*variables)["default"];
  }
}

}  // namespace

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

ImmutableEnumFieldGenerator::ImmutableEnumFieldGenerator(
    const FieldDescriptor* descriptor, int messageBitIndex, int builderBitIndex,
    Context* context)
    : descriptor_(descriptor), name_resolver_(context->GetNameResolver()) {
  SetEnumVariables(descriptor, messageBitIndex, builderBitIndex,
                   context->GetFieldGeneratorInfo(descriptor), name_resolver_,
                   &variables_);
}

ImmutableEnumFieldGenerator::~ImmutableEnumFieldGenerator() {}

int ImmutableEnumFieldGenerator::GetNumBitsForMessage() const {
  return SupportFieldPresence(descriptor_->file()) ? 1 : 0;
}

int ImmutableEnumFieldGenerator::GetNumBitsForBuilder() const {
  return GetNumBitsForMessage();
}

void ImmutableEnumFieldGenerator::GenerateInterfaceMembers(
    io::Printer* printer) const {
  if (SupportFieldPresence(descriptor_->file())) {
    WriteFieldAccessorDocComment(printer, descriptor_, HAZZER);
    printer->Print(variables_,
                   "$deprecation$boolean has$capitalized_name$();\n");
  }
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, GETTER);
    printer->Print(variables_,
                   "$deprecation$int get$capitalized_name$Value();\n");
  }
  WriteFieldAccessorDocComment(printer, descriptor_, GETTER);
  printer->Print(variables_, "$deprecation$$type$ get$capitalized_name$();\n");
}

void ImmutableEnumFieldGenerator::GenerateMembers(io::Printer* printer) const {
  printer->Print(variables_, "private int $name$_;\n");
  PrintExtraFieldInfo(variables_, printer);
  if (SupportFieldPresence(descriptor_->file())) {
    WriteFieldAccessorDocComment(printer, descriptor_, HAZZER);
    printer->Print(
        variables_,
        "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
        "  return $get_has_field_bit_message$;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, GETTER);
    printer->Print(
        variables_,
        "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
        "  return $name$_;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  WriteFieldAccessorDocComment(printer, descriptor_, GETTER);
  printer->Print(variables_,
                 "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
                 "  @SuppressWarnings(\"deprecation\")\n"
                 "  $type$ result = $type$.$for_number$($name$_);\n"
                 "  return result == null ? $unknown$ : result;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
}

void ImmutableEnumFieldGenerator::GenerateBuilderMembers(
    io::Printer* printer) const {
  printer->Print(variables_, "private int $name$_ = $default_number$;\n");
  if (SupportFieldPresence(descriptor_->file())) {
    WriteFieldAccessorDocComment(printer, descriptor_, HAZZER);
    printer->Print(
        variables_,
        "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
        "  return $get_has_field_bit_builder$;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, GETTER);
    printer->Print(
        variables_,
        "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
        "  return $name$_;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, SETTER,
                                          /* builder */ true);
    printer->Print(variables_,
                   "$deprecation$public Builder "
                   "${$set$capitalized_name$Value$}$(int value) {\n"
                   "  $name$_ = value;\n"
                   "  $on_changed$\n"
                   "  return this;\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  WriteFieldAccessorDocComment(printer, descriptor_, GETTER);
  printer->Print(variables_,
                 "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
                 "  @SuppressWarnings(\"deprecation\")\n"
                 "  $type$ result = $type$.$for_number$($name$_);\n"
                 "  return result == null ? $unknown$ : result;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, SETTER,
                               /* builder */ true);
  printer->Print(variables_,
                 "$deprecation$public Builder "
                 "${$set$capitalized_name$$}$($type$ value) {\n"
                 "  if (value == null) {\n"
                 "    throw new NullPointerException();\n"
                 "  }\n"
                 "  $set_has_field_bit_builder$\n"
                 "  $name$_ = value.getNumber();\n"
                 "  $on_changed$\n"
                 "  return this;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, CLEARER,
                               /* builder */ true);
  printer->Print(
      variables_,
      "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
      "  $clear_has_field_bit_builder$\n"
      "  $name$_ = $default_number$;\n"
      "  $on_changed$\n"
      "  return this;\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
}

void ImmutableEnumFieldGenerator::GenerateFieldBuilderInitializationCode(
    io::Printer* printer) const {
  // noop for enums
}

void ImmutableEnumFieldGenerator::GenerateInitializationCode(
    io::Printer* printer) const {
  printer->Print(variables_, "$name$_ = $default_number$;\n");
}

void ImmutableEnumFieldGenerator::GenerateBuilderClearCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "$name$_ = $default_number$;\n"
                 "$clear_has_field_bit_builder$\n");
}

void ImmutableEnumFieldGenerator::GenerateMergingCode(
    io::Printer* printer) const {
  if (SupportFieldPresence(descriptor_->file())) {
    printer->Print(variables_,
                   "if (other.has$capitalized_name$()) {\n"
                   "  set$capitalized_name$(other.get$capitalized_name$());\n"
                   "}\n");
  } else if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(
        variables_,
        "if (other.$name$_ != $default_number$) {\n"
        "  set$capitalized_name$Value(other.get$capitalized_name$Value());\n"
        "}\n");
  } else {
    GOOGLE_LOG(FATAL) << "Can't reach here.";
  }
}

void ImmutableEnumFieldGenerator::GenerateBuildingCode(
    io::Printer* printer) const {
  if (SupportFieldPresence(descriptor_->file())) {
    printer->Print(variables_,
                   "if ($get_has_field_bit_from_local$) {\n"
                   "  $set_has_field_bit_to_local$;\n"
                   "}\n");
  }
  printer->Print(variables_, "result.$name$_ = $name$_;\n");
}

void ImmutableEnumFieldGenerator::GenerateParsingCode(
    io::Printer* printer) const {
  if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(variables_,
                   "int rawValue = input.readEnum();\n"
                   "$set_has_field_bit_message$\n"
                   "$name$_ = rawValue;\n");
  } else {
    printer->Print(variables_,
                   "int rawValue = input.readEnum();\n"
                   "  @SuppressWarnings(\"deprecation\")\n"
                   "$type$ value = $type$.$for_number$(rawValue);\n"
                   "if (value == null) {\n"
                   "  unknownFields.mergeVarintField($number$, rawValue);\n"
                   "} else {\n"
                   "  $set_has_field_bit_message$\n"
                   "  $name$_ = rawValue;\n"
                   "}\n");
  }
}

void ImmutableEnumFieldGenerator::GenerateParsingDoneCode(
    io::Printer* printer) const {
  // noop for enums
}

void ImmutableEnumFieldGenerator::GenerateSerializationCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "if ($is_field_present_message$) {\n"
                 "  output.writeEnum($number$, $name$_);\n"
                 "}\n");
}

void ImmutableEnumFieldGenerator::GenerateSerializedSizeCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "if ($is_field_present_message$) {\n"
                 "  size += com.google.protobuf.CodedOutputStream\n"
                 "    .computeEnumSize($number$, $name$_);\n"
                 "}\n");
}

void ImmutableEnumFieldGenerator::GenerateEqualsCode(
    io::Printer* printer) const {
  printer->Print(variables_, "if ($name$_ != other.$name$_) return false;\n");
}

void ImmutableEnumFieldGenerator::GenerateHashCode(io::Printer* printer) const {
  printer->Print(variables_,
                 "hash = (37 * hash) + $constant_name$;\n"
                 "hash = (53 * hash) + $name$_;\n");
}

std::string ImmutableEnumFieldGenerator::GetBoxedType() const {
  return name_resolver_->GetImmutableClassName(descriptor_->enum_type());
}

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

ImmutableEnumOneofFieldGenerator::ImmutableEnumOneofFieldGenerator(
    const FieldDescriptor* descriptor, int messageBitIndex, int builderBitIndex,
    Context* context)
    : ImmutableEnumFieldGenerator(descriptor, messageBitIndex, builderBitIndex,
                                  context) {
  const OneofGeneratorInfo* info =
      context->GetOneofGeneratorInfo(descriptor->containing_oneof());
  SetCommonOneofVariables(descriptor, info, &variables_);
}

ImmutableEnumOneofFieldGenerator::~ImmutableEnumOneofFieldGenerator() {}

void ImmutableEnumOneofFieldGenerator::GenerateMembers(
    io::Printer* printer) const {
  PrintExtraFieldInfo(variables_, printer);
  if (SupportFieldPresence(descriptor_->file())) {
    WriteFieldAccessorDocComment(printer, descriptor_, HAZZER);
    printer->Print(
        variables_,
        "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
        "  return $has_oneof_case_message$;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, GETTER);
    printer->Print(
        variables_,
        "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
        "  if ($has_oneof_case_message$) {\n"
        "    return (java.lang.Integer) $oneof_name$_;\n"
        "  }\n"
        "  return $default_number$;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  WriteFieldAccessorDocComment(printer, descriptor_, GETTER);
  printer->Print(variables_,
                 "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
                 "  if ($has_oneof_case_message$) {\n"
                 "    @SuppressWarnings(\"deprecation\")\n"
                 "    $type$ result = $type$.$for_number$(\n"
                 "        (java.lang.Integer) $oneof_name$_);\n"
                 "    return result == null ? $unknown$ : result;\n"
                 "  }\n"
                 "  return $default$;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
}

void ImmutableEnumOneofFieldGenerator::GenerateBuilderMembers(
    io::Printer* printer) const {
  if (SupportFieldPresence(descriptor_->file())) {
    WriteFieldAccessorDocComment(printer, descriptor_, HAZZER);
    printer->Print(
        variables_,
        "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
        "  return $has_oneof_case_message$;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, GETTER);
    printer->Print(
        variables_,
        "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
        "  if ($has_oneof_case_message$) {\n"
        "    return ((java.lang.Integer) $oneof_name$_).intValue();\n"
        "  }\n"
        "  return $default_number$;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, SETTER,
                                          /* builder */ true);
    printer->Print(variables_,
                   "$deprecation$public Builder "
                   "${$set$capitalized_name$Value$}$(int value) {\n"
                   "  $set_oneof_case_message$;\n"
                   "  $oneof_name$_ = value;\n"
                   "  $on_changed$\n"
                   "  return this;\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
  WriteFieldAccessorDocComment(printer, descriptor_, GETTER);
  printer->Print(variables_,
                 "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
                 "  if ($has_oneof_case_message$) {\n"
                 "    @SuppressWarnings(\"deprecation\")\n"
                 "    $type$ result = $type$.$for_number$(\n"
                 "        (java.lang.Integer) $oneof_name$_);\n"
                 "    return result == null ? $unknown$ : result;\n"
                 "  }\n"
                 "  return $default$;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, SETTER,
                               /* builder */ true);
  printer->Print(variables_,
                 "$deprecation$public Builder "
                 "${$set$capitalized_name$$}$($type$ value) {\n"
                 "  if (value == null) {\n"
                 "    throw new NullPointerException();\n"
                 "  }\n"
                 "  $set_oneof_case_message$;\n"
                 "  $oneof_name$_ = value.getNumber();\n"
                 "  $on_changed$\n"
                 "  return this;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, CLEARER,
                               /* builder */ true);
  printer->Print(
      variables_,
      "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
      "  if ($has_oneof_case_message$) {\n"
      "    $clear_oneof_case_message$;\n"
      "    $oneof_name$_ = null;\n"
      "    $on_changed$\n"
      "  }\n"
      "  return this;\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
}

void ImmutableEnumOneofFieldGenerator::GenerateBuildingCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "if ($has_oneof_case_message$) {\n"
                 "  result.$oneof_name$_ = $oneof_name$_;\n"
                 "}\n");
}

void ImmutableEnumOneofFieldGenerator::GenerateMergingCode(
    io::Printer* printer) const {
  if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(
        variables_,
        "set$capitalized_name$Value(other.get$capitalized_name$Value());\n");
  } else {
    printer->Print(variables_,
                   "set$capitalized_name$(other.get$capitalized_name$());\n");
  }
}

void ImmutableEnumOneofFieldGenerator::GenerateParsingCode(
    io::Printer* printer) const {
  if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(variables_,
                   "int rawValue = input.readEnum();\n"
                   "$set_oneof_case_message$;\n"
                   "$oneof_name$_ = rawValue;\n");
  } else {
    printer->Print(variables_,
                   "int rawValue = input.readEnum();\n"
                   "@SuppressWarnings(\"deprecation\")\n"
                   "$type$ value = $type$.$for_number$(rawValue);\n"
                   "if (value == null) {\n"
                   "  unknownFields.mergeVarintField($number$, rawValue);\n"
                   "} else {\n"
                   "  $set_oneof_case_message$;\n"
                   "  $oneof_name$_ = rawValue;\n"
                   "}\n");
  }
}

void ImmutableEnumOneofFieldGenerator::GenerateSerializationCode(
    io::Printer* printer) const {
  printer->Print(
      variables_,
      "if ($has_oneof_case_message$) {\n"
      "  output.writeEnum($number$, ((java.lang.Integer) $oneof_name$_));\n"
      "}\n");
}

void ImmutableEnumOneofFieldGenerator::GenerateSerializedSizeCode(
    io::Printer* printer) const {
  printer->Print(
      variables_,
      "if ($has_oneof_case_message$) {\n"
      "  size += com.google.protobuf.CodedOutputStream\n"
      "    .computeEnumSize($number$, ((java.lang.Integer) $oneof_name$_));\n"
      "}\n");
}

void ImmutableEnumOneofFieldGenerator::GenerateEqualsCode(
    io::Printer* printer) const {
  if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(
        variables_,
        "if (get$capitalized_name$Value()\n"
        "    != other.get$capitalized_name$Value()) return false;\n");
  } else {
    printer->Print(
        variables_,
        "if (!get$capitalized_name$()\n"
        "    .equals(other.get$capitalized_name$())) return false;\n");
  }
}

void ImmutableEnumOneofFieldGenerator::GenerateHashCode(
    io::Printer* printer) const {
  if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(variables_,
                   "hash = (37 * hash) + $constant_name$;\n"
                   "hash = (53 * hash) + get$capitalized_name$Value();\n");
  } else {
    printer->Print(
        variables_,
        "hash = (37 * hash) + $constant_name$;\n"
        "hash = (53 * hash) + get$capitalized_name$().getNumber();\n");
  }
}

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

RepeatedImmutableEnumFieldGenerator::RepeatedImmutableEnumFieldGenerator(
    const FieldDescriptor* descriptor, int messageBitIndex, int builderBitIndex,
    Context* context)
    : descriptor_(descriptor), name_resolver_(context->GetNameResolver()) {
  SetEnumVariables(descriptor, messageBitIndex, builderBitIndex,
                   context->GetFieldGeneratorInfo(descriptor), name_resolver_,
                   &variables_);
}

RepeatedImmutableEnumFieldGenerator::~RepeatedImmutableEnumFieldGenerator() {}

int RepeatedImmutableEnumFieldGenerator::GetNumBitsForMessage() const {
  return 0;
}

int RepeatedImmutableEnumFieldGenerator::GetNumBitsForBuilder() const {
  return 1;
}

void RepeatedImmutableEnumFieldGenerator::GenerateInterfaceMembers(
    io::Printer* printer) const {
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_GETTER);
  printer->Print(
      variables_,
      "$deprecation$java.util.List<$type$> get$capitalized_name$List();\n");
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_COUNT);
  printer->Print(variables_,
                 "$deprecation$int get$capitalized_name$Count();\n");
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_INDEXED_GETTER);
  printer->Print(variables_,
                 "$deprecation$$type$ get$capitalized_name$(int index);\n");
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, LIST_GETTER);
    printer->Print(variables_,
                   "$deprecation$java.util.List<java.lang.Integer>\n"
                   "get$capitalized_name$ValueList();\n");
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_,
                                          LIST_INDEXED_GETTER);
    printer->Print(variables_,
                   "$deprecation$int get$capitalized_name$Value(int index);\n");
  }
}

void RepeatedImmutableEnumFieldGenerator::GenerateMembers(
    io::Printer* printer) const {
  printer->Print(
      variables_,
      "private java.util.List<java.lang.Integer> $name$_;\n"
      "private static final "
      "com.google.protobuf.Internal.ListAdapter.Converter<\n"
      "    java.lang.Integer, $type$> $name$_converter_ =\n"
      "        new com.google.protobuf.Internal.ListAdapter.Converter<\n"
      "            java.lang.Integer, $type$>() {\n"
      "          public $type$ convert(java.lang.Integer from) {\n"
      "            @SuppressWarnings(\"deprecation\")\n"
      "            $type$ result = $type$.$for_number$(from);\n"
      "            return result == null ? $unknown$ : result;\n"
      "          }\n"
      "        };\n");
  PrintExtraFieldInfo(variables_, printer);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_GETTER);
  printer->Print(
      variables_,
      "$deprecation$public java.util.List<$type$> "
      "${$get$capitalized_name$List$}$() {\n"
      "  return new com.google.protobuf.Internal.ListAdapter<\n"
      "      java.lang.Integer, $type$>($name$_, $name$_converter_);\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_COUNT);
  printer->Print(
      variables_,
      "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
      "  return $name$_.size();\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_INDEXED_GETTER);
  printer->Print(
      variables_,
      "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
      "  return $name$_converter_.convert($name$_.get(index));\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, LIST_GETTER);
    printer->Print(variables_,
                   "$deprecation$public java.util.List<java.lang.Integer>\n"
                   "${$get$capitalized_name$ValueList$}$() {\n"
                   "  return $name$_;\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_,
                                          LIST_INDEXED_GETTER);
    printer->Print(variables_,
                   "$deprecation$public int "
                   "${$get$capitalized_name$Value$}$(int index) {\n"
                   "  return $name$_.get(index);\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
  }

  if (descriptor_->is_packed()) {
    printer->Print(variables_, "private int $name$MemoizedSerializedSize;\n");
  }
}

void RepeatedImmutableEnumFieldGenerator::GenerateBuilderMembers(
    io::Printer* printer) const {
  printer->Print(
      variables_,
      // One field is the list and the other field keeps track of whether the
      // list is immutable. If it's immutable, the invariant is that it must
      // either an instance of Collections.emptyList() or it's an ArrayList
      // wrapped in a Collections.unmodifiableList() wrapper and nobody else has
      // a refererence to the underlying ArrayList. This invariant allows us to
      // share instances of lists between protocol buffers avoiding expensive
      // memory allocations. Note, immutable is a strong guarantee here -- not
      // just that the list cannot be modified via the reference but that the
      // list can never be modified.
      "private java.util.List<java.lang.Integer> $name$_ =\n"
      "  java.util.Collections.emptyList();\n"

      "private void ensure$capitalized_name$IsMutable() {\n"
      "  if (!$get_mutable_bit_builder$) {\n"
      "    $name$_ = new java.util.ArrayList<java.lang.Integer>($name$_);\n"
      "    $set_mutable_bit_builder$;\n"
      "  }\n"
      "}\n");

  WriteFieldAccessorDocComment(printer, descriptor_, LIST_GETTER);
  printer->Print(
      variables_,
      // Note:  We return an unmodifiable list because otherwise the caller
      //   could hold on to the returned list and modify it after the message
      //   has been built, thus mutating the message which is supposed to be
      //   immutable.
      "$deprecation$public java.util.List<$type$> "
      "${$get$capitalized_name$List$}$() {\n"
      "  return new com.google.protobuf.Internal.ListAdapter<\n"
      "      java.lang.Integer, $type$>($name$_, $name$_converter_);\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_COUNT);
  printer->Print(
      variables_,
      "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
      "  return $name$_.size();\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_INDEXED_GETTER);
  printer->Print(
      variables_,
      "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
      "  return $name$_converter_.convert($name$_.get(index));\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_INDEXED_SETTER,
                               /* builder */ true);
  printer->Print(variables_,
                 "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
                 "    int index, $type$ value) {\n"
                 "  if (value == null) {\n"
                 "    throw new NullPointerException();\n"
                 "  }\n"
                 "  ensure$capitalized_name$IsMutable();\n"
                 "  $name$_.set(index, value.getNumber());\n"
                 "  $on_changed$\n"
                 "  return this;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_ADDER,
                               /* builder */ true);
  printer->Print(variables_,
                 "$deprecation$public Builder "
                 "${$add$capitalized_name$$}$($type$ value) {\n"
                 "  if (value == null) {\n"
                 "    throw new NullPointerException();\n"
                 "  }\n"
                 "  ensure$capitalized_name$IsMutable();\n"
                 "  $name$_.add(value.getNumber());\n"
                 "  $on_changed$\n"
                 "  return this;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, LIST_MULTI_ADDER,
                               /* builder */ true);
  printer->Print(variables_,
                 "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
                 "    java.lang.Iterable<? extends $type$> values) {\n"
                 "  ensure$capitalized_name$IsMutable();\n"
                 "  for ($type$ value : values) {\n"
                 "    $name$_.add(value.getNumber());\n"
                 "  }\n"
                 "  $on_changed$\n"
                 "  return this;\n"
                 "}\n");
  printer->Annotate("{", "}", descriptor_);
  WriteFieldAccessorDocComment(printer, descriptor_, CLEARER,
                               /* builder */ true);
  printer->Print(
      variables_,
      "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
      "  $name$_ = java.util.Collections.emptyList();\n"
      "  $clear_mutable_bit_builder$;\n"
      "  $on_changed$\n"
      "  return this;\n"
      "}\n");
  printer->Annotate("{", "}", descriptor_);

  if (SupportUnknownEnumValue(descriptor_->file())) {
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, LIST_GETTER);
    printer->Print(variables_,
                   "$deprecation$public java.util.List<java.lang.Integer>\n"
                   "${$get$capitalized_name$ValueList$}$() {\n"
                   "  return java.util.Collections.unmodifiableList($name$_);\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_,
                                          LIST_INDEXED_GETTER);
    printer->Print(variables_,
                   "$deprecation$public int "
                   "${$get$capitalized_name$Value$}$(int index) {\n"
                   "  return $name$_.get(index);\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_,
                                          LIST_INDEXED_GETTER,
                                          /* builder */ true);
    printer->Print(
        variables_,
        "$deprecation$public Builder ${$set$capitalized_name$Value$}$(\n"
        "    int index, int value) {\n"
        "  ensure$capitalized_name$IsMutable();\n"
        "  $name$_.set(index, value);\n"
        "  $on_changed$\n"
        "  return this;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_, LIST_ADDER,
                                          /* builder */ true);
    printer->Print(variables_,
                   "$deprecation$public Builder "
                   "${$add$capitalized_name$Value$}$(int value) {\n"
                   "  ensure$capitalized_name$IsMutable();\n"
                   "  $name$_.add(value);\n"
                   "  $on_changed$\n"
                   "  return this;\n"
                   "}\n");
    printer->Annotate("{", "}", descriptor_);
    WriteFieldEnumValueAccessorDocComment(printer, descriptor_,
                                          LIST_MULTI_ADDER, /* builder */ true);
    printer->Print(
        variables_,
        "$deprecation$public Builder ${$addAll$capitalized_name$Value$}$(\n"
        "    java.lang.Iterable<java.lang.Integer> values) {\n"
        "  ensure$capitalized_name$IsMutable();\n"
        "  for (int value : values) {\n"
        "    $name$_.add(value);\n"
        "  }\n"
        "  $on_changed$\n"
        "  return this;\n"
        "}\n");
    printer->Annotate("{", "}", descriptor_);
  }
}

void RepeatedImmutableEnumFieldGenerator::
    GenerateFieldBuilderInitializationCode(io::Printer* printer) const {
  // noop for enums
}

void RepeatedImmutableEnumFieldGenerator::GenerateInitializationCode(
    io::Printer* printer) const {
  printer->Print(variables_, "$name$_ = java.util.Collections.emptyList();\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateBuilderClearCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "$name$_ = java.util.Collections.emptyList();\n"
                 "$clear_mutable_bit_builder$;\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateMergingCode(
    io::Printer* printer) const {
  // The code below does two optimizations:
  //   1. If the other list is empty, there's nothing to do. This ensures we
  //      don't allocate a new array if we already have an immutable one.
  //   2. If the other list is non-empty and our current list is empty, we can
  //      reuse the other list which is guaranteed to be immutable.
  printer->Print(variables_,
                 "if (!other.$name$_.isEmpty()) {\n"
                 "  if ($name$_.isEmpty()) {\n"
                 "    $name$_ = other.$name$_;\n"
                 "    $clear_mutable_bit_builder$;\n"
                 "  } else {\n"
                 "    ensure$capitalized_name$IsMutable();\n"
                 "    $name$_.addAll(other.$name$_);\n"
                 "  }\n"
                 "  $on_changed$\n"
                 "}\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateBuildingCode(
    io::Printer* printer) const {
  // The code below ensures that the result has an immutable list. If our
  // list is immutable, we can just reuse it. If not, we make it immutable.
  printer->Print(
      variables_,
      "if ($get_mutable_bit_builder$) {\n"
      "  $name$_ = java.util.Collections.unmodifiableList($name$_);\n"
      "  $clear_mutable_bit_builder$;\n"
      "}\n"
      "result.$name$_ = $name$_;\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateParsingCode(
    io::Printer* printer) const {
  // Read and store the enum
  if (SupportUnknownEnumValue(descriptor_->file())) {
    printer->Print(variables_,
                   "int rawValue = input.readEnum();\n"
                   "if (!$get_mutable_bit_parser$) {\n"
                   "  $name$_ = new java.util.ArrayList<java.lang.Integer>();\n"
                   "  $set_mutable_bit_parser$;\n"
                   "}\n"
                   "$name$_.add(rawValue);\n");
  } else {
    printer->Print(
        variables_,
        "int rawValue = input.readEnum();\n"
        "@SuppressWarnings(\"deprecation\")\n"
        "$type$ value = $type$.$for_number$(rawValue);\n"
        "if (value == null) {\n"
        "  unknownFields.mergeVarintField($number$, rawValue);\n"
        "} else {\n"
        "  if (!$get_mutable_bit_parser$) {\n"
        "    $name$_ = new java.util.ArrayList<java.lang.Integer>();\n"
        "    $set_mutable_bit_parser$;\n"
        "  }\n"
        "  $name$_.add(rawValue);\n"
        "}\n");
  }
}

void RepeatedImmutableEnumFieldGenerator::GenerateParsingCodeFromPacked(
    io::Printer* printer) const {
  // Wrap GenerateParsingCode's contents with a while loop.

  printer->Print(variables_,
                 "int length = input.readRawVarint32();\n"
                 "int oldLimit = input.pushLimit(length);\n"
                 "while(input.getBytesUntilLimit() > 0) {\n");
  printer->Indent();

  GenerateParsingCode(printer);

  printer->Outdent();
  printer->Print(variables_,
                 "}\n"
                 "input.popLimit(oldLimit);\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateParsingDoneCode(
    io::Printer* printer) const {
  printer->Print(
      variables_,
      "if ($get_mutable_bit_parser$) {\n"
      "  $name$_ = java.util.Collections.unmodifiableList($name$_);\n"
      "}\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateSerializationCode(
    io::Printer* printer) const {
  if (descriptor_->is_packed()) {
    printer->Print(variables_,
                   "if (get$capitalized_name$List().size() > 0) {\n"
                   "  output.writeUInt32NoTag($tag$);\n"
                   "  output.writeUInt32NoTag($name$MemoizedSerializedSize);\n"
                   "}\n"
                   "for (int i = 0; i < $name$_.size(); i++) {\n"
                   "  output.writeEnumNoTag($name$_.get(i));\n"
                   "}\n");
  } else {
    printer->Print(variables_,
                   "for (int i = 0; i < $name$_.size(); i++) {\n"
                   "  output.writeEnum($number$, $name$_.get(i));\n"
                   "}\n");
  }
}

void RepeatedImmutableEnumFieldGenerator::GenerateSerializedSizeCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "{\n"
                 "  int dataSize = 0;\n");
  printer->Indent();

  printer->Print(variables_,
                 "for (int i = 0; i < $name$_.size(); i++) {\n"
                 "  dataSize += com.google.protobuf.CodedOutputStream\n"
                 "    .computeEnumSizeNoTag($name$_.get(i));\n"
                 "}\n");
  printer->Print("size += dataSize;\n");
  if (descriptor_->is_packed()) {
    printer->Print(variables_,
                   "if (!get$capitalized_name$List().isEmpty()) {"
                   "  size += $tag_size$;\n"
                   "  size += com.google.protobuf.CodedOutputStream\n"
                   "    .computeUInt32SizeNoTag(dataSize);\n"
                   "}");
  } else {
    printer->Print(variables_, "size += $tag_size$ * $name$_.size();\n");
  }

  // cache the data size for packed fields.
  if (descriptor_->is_packed()) {
    printer->Print(variables_, "$name$MemoizedSerializedSize = dataSize;\n");
  }

  printer->Outdent();
  printer->Print("}\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateEqualsCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "if (!$name$_.equals(other.$name$_)) return false;\n");
}

void RepeatedImmutableEnumFieldGenerator::GenerateHashCode(
    io::Printer* printer) const {
  printer->Print(variables_,
                 "if (get$capitalized_name$Count() > 0) {\n"
                 "  hash = (37 * hash) + $constant_name$;\n"
                 "  hash = (53 * hash) + $name$_.hashCode();\n"
                 "}\n");
}

std::string RepeatedImmutableEnumFieldGenerator::GetBoxedType() const {
  return name_resolver_->GetImmutableClassName(descriptor_->enum_type());
}

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