KotlinでProtocol Buffersを使ってみた

# Introduction

Kotlinの勉強がてら、Protocol Buffersをgradleでビルドしてみました。

前回までのKotlinシリーズはこちら。

* [KotlinとGradleとSpekとIntelliJIdeaで環境構築](https://qiita.com/dynamitecoolguy/items/e106948b59ec2e32f291)
* [KotlinでReactorのハンズオン書いてみた](https://qiita.com/dynamitecoolguy/items/f8d61edb4587db0773df)

# 環境設定

## protobuf

まずは、protoファイルのコンパイラをインストールします。
Ubuntu環境なので、snapを使ってインストールできます。

```
$ sudo snap install --classic protobuf
$ protoc --version
libprotoc 3.6.0
```

## Gradle各種設定

### gradle.properties

[環境構築の記事](https://qiita.com/dynamitecoolguy/items/e106948b59ec2e32f291#gradleproperties)の際に作成したものと同じです。　

```gradle.properties
org.gradle.jvmargs=-Djavax.net.ssl.trustStore=/etc/ssl/certs/java/cacerts -Djavax.net.ssl.trustStorePassword=changeit -Dorg.gradle.daemon=false
```

### settings.gradle

[環境構築の記事](https://qiita.com/dynamitecoolguy/items/e106948b59ec2e32f291#settingsgradle)の際に作成したものに、gradlePluginPortal()を追加しています。これは、後で出てくるgradle用のprotobufプラグインをインストールするためです。 
なお、プロジェクト名は、今回のテスト用に"protobufwork"にしています。

```settings.gradle
pluginManagement {
    repositories {
        mavenCentral()
        gradlePluginPortal()

        // Kotlin
        maven {
            url { 'https://dl.bintray.com/kotlin/kotlin-dev' }
        }
    }
}

rootProject.name = 'protobufwork'
```

### build.gradle

[環境構築の記事](https://qiita.com/dynamitecoolguy/items/e106948b59ec2e32f291#settingsgradle)の際に作成したものと、以下の点が異なります。

* Protobufプラグインの追加
* protoファイルを置くためのソースセットの追加
* Protobuf用のリポジトリの追加
* Protobuf用のdependencyの追加
* Protobuf用のセクションを追加し、protoファイルから生成されるファイルのパスを指定している

```build.gradle
plugins {
    // Kotlin
    id 'org.jetbrains.kotlin.jvm' version '1.2.51'

    // Protobuf
    id 'com.google.protobuf' version '0.8.6'
}

sourceSets {
    main.proto.srcDirs += 'src/main/proto'
}

group 'hogehoge'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()

    // Spek
    maven {
        url { 'http://dl.bintray.com/jetbrains/spek' }
    }

    // Protobuf
    maven {
        url { 'https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java' }
    }
}

dependencies {
    // Kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.51"

    // JUnit5
    testImplementation 'org.jetbrains.kotlin:kotlin-test-junit5:1.2.51'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.2.0'
    testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.2.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.2.0'

    // Spek
    testImplementation 'org.jetbrains.spek:spek-api:1.1.5'
    implementation 'org.jetbrains.kotlin:kotlin-reflect:1.2.51'
    testRuntimeOnly 'org.jetbrains.spek:spek-junit-platform-engine:1.1.5'

    // Protobuf
    implementation 'com.google.protobuf:protobuf-java:3.6.0'
}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

test {
    useJUnitPlatform()
}

protobuf {
    generatedFilesBaseDir = "$projectDir/src"
}
```

# サンプル実装

## protoファイル

サンプル実装より、Protocol Buffers用の定義ファイルを作成します。

```src/proto/addressbook.proto

// [START declaration]
syntax = "proto3";
package tutorial;

import "google/protobuf/timestamp.proto";
// [END declaration]

// [START java_declaration]
option java_package = "com.example.tutorial";
option java_outer_classname = "AddressBookProtos";
// [END java_declaration]

// [START csharp_declaration]
option csharp_namespace = "Google.Protobuf.Examples.AddressBook";
// [END csharp_declaration]

// [START messages]
message Person {
    string name = 1;
    int32 id = 2;  // Unique ID number for this person.
    string email = 3;

    enum PhoneType {
        MOBILE = 0;
        HOME = 1;
        WORK = 2;
    }

    message PhoneNumber {
        string number = 1;
        PhoneType type = 2;
    }

    repeated PhoneNumber phones = 4;

    google.protobuf.Timestamp last_updated = 5;
}

// Our address book file is just one of these.
message AddressBook {
    repeated Person people = 1;
}
// [END messages]
```

## ビルド

ビルドを行うと、protoファイルをprotocでコンパイルし、生成されたコードがbuild.gradleのprotobufセグメントで指定されたパスに自動的に配置されます。
以下、長いですが、protocを用いて自動生成されたjavaコードです。

```src/main/java/com/example/tutorial/AddressBookProtos.java
// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: addressbook.proto

package com.example.tutorial;

public final class AddressBookProtos {
  private AddressBookProtos() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
    registerAllExtensions(
        (com.google.protobuf.ExtensionRegistryLite) registry);
  }
  public interface PersonOrBuilder extends
      // @@protoc_insertion_point(interface_extends:tutorial.Person)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <code>string name = 1;</code>
     */
    java.lang.String getName();
    /**
     * <code>string name = 1;</code>
     */
    com.google.protobuf.ByteString
        getNameBytes();

    /**
     * <pre>
     * Unique ID number for this person.
     * </pre>
     *
     * <code>int32 id = 2;</code>
     */
    int getId();

    /**
     * <code>string email = 3;</code>
     */
    java.lang.String getEmail();
    /**
     * <code>string email = 3;</code>
     */
    com.google.protobuf.ByteString
        getEmailBytes();

    /**
     * <code>repeated .tutorial.Person.PhoneNumber phones = 4;</code>
     */
    java.util.List<com.example.tutorial.AddressBookProtos.Person.PhoneNumber> 
        getPhonesList();
    /**
     * <code>repeated .tutorial.Person.PhoneNumber phones = 4;</code>
     */
    com.example.tutorial.AddressBookProtos.Person.PhoneNumber getPhones(int index);
    /**
     * <code>repeated .tutorial.Person.PhoneNumber phones = 4;</code>
     */
    int getPhonesCount();
    /**
     * <code>repeated .tutorial.Person.PhoneNumber phones = 4;</code>
     */
    java.util.List<? extends com.example.tutorial.AddressBookProtos.Person.PhoneNumberOrBuilder> 
        getPhonesOrBuilderList();
    /**
     * <code>repeated .tutorial.Person.PhoneNumber phones = 4;</code>
     */
    com.example.tutorial.AddressBookProtos.Person.PhoneNumberOrBuilder getPhonesOrBuilder(
        int index);

    /**
     * <code>.google.protobuf.Timestamp last_updated = 5;</code>
     */
    boolean hasLastUpdated();
    /**
     * <code>.google.protobuf.Timestamp last_updated = 5;</code>
     */
    com.google.protobuf.Timestamp getLastUpdated();
    /**
     * <code>.google.protobuf.Timestamp last_updated = 5;</code>
     */
    com.google.protobuf.TimestampOrBuilder getLastUpdatedOrBuilder();
  }
  /**
   * <pre>
   * [START messages]
   * </pre>
   *
   * Protobuf type {@code tutorial.Person}
   */
  public  static final class Person extends
      com.google.protobuf.GeneratedMessageV3 implements
      // @@protoc_insertion_point(message_implements:tutorial.Person)
      PersonOrBuilder {
  private static final long serialVersionUID = 0L;
    // Use Person.newBuilder() to construct.
    private Person(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
      super(builder);
    }
    private Person() {
      name_ = "";
      id_ = 0;
      email_ = "";
      phones_ = java.util.Collections.emptyList();
    }

    @java.lang.Override
    public final com.google.protobuf.UnknownFieldSet
    getUnknownFields() {
      return this.unknownFields;
    }
    private Person(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      this();
      if (extensionRegistry == null) {
        throw new java.lang.NullPointerException();
      }
      int mutable_bitField0_ = 0;
      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
          com.google.protobuf.UnknownFieldSet.newBuilder();
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            case 10: {
              java.lang.String s = input.readStringRequireUtf8();

              name_ = s;
              break;
            }
            case 16: {

              id_ = input.readInt32();
              break;
            }
            case 26: {
              java.lang.String s = input.readStringRequireUtf8();

              email_ = s;
              break;
            }
            case 34: {
              if (!((mutable_bitField0_ & 0x00000008) == 0x00000008)) {
                phones_ = new java.util.ArrayList<com.example.tutorial.AddressBookProtos.Person.PhoneNumber>();
                mutable_bitField0_ |= 0x00000008;
              }
              phones_.add(
                  input.readMessage(com.example.tutorial.AddressBookProtos.Person.PhoneNumber.parser(), extensionRegistry));
              break;
            }
            case 42: {
              com.google.protobuf.Timestamp.Builder subBuilder = null;
              if (lastUpdated_ != null) {
                subBuilder = lastUpdated_.toBuilder();
              }
              lastUpdated_ = input.readMessage(com.google.protobuf.Timestamp.parser(), extensionRegistry);
              if (subBuilder != null) {
                subBuilder.mergeFrom(lastUpdated_);
                lastUpdated_ = subBuilder.buildPartial();
              }

              break;
            }
            default: {
              if (!parseUnknownFieldProto3(
                  input, unknownFields, extensionRegistry, tag)) {
                done = true;
              }
              break;
            }
          }
        }
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(this);
      } catch (java.io.IOException e) {
        throw new com.google.protobuf.InvalidProtocolBufferException(
            e).setUnfinishedMessage(this);
      } finally {
        if (((mutable_bitField0_ & 0x00000008) == 0x00000008)) {
          phones_ = java.util.Collections.unmodifiableList(phones_);
        }
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return com.example.tutorial.AddressBookProtos.internal_static_tutorial_Person_descriptor;
    }

    @java.lang.Override
    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
        internalGetFieldAccessorTable() {
      return com.example.tutorial.AddressBookProtos.internal_static_tutorial_Person_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              com.example.tutorial.AddressBookProtos.Person.class, com.example.tutorial.AddressBookProtos.Person.Builder.class);
    }

    /**
     * Protobuf enum {@code tutorial.Person.PhoneType}
     */
    public enum PhoneType
        implements com.google.protobuf.ProtocolMessageEnum {
      /**
       * <code>MOBILE = 0;</code>
       */
      MOBILE(0),
      /**
       * <code>HOME = 1;</code>
       */
      HOME(1),
      /**
       * <code>WORK = 2;</code>
       */
      WORK(2),
      UNRECOGNIZED(-1),
      ;

      /**
       * <code>MOBILE = 0;</code>
       */
      public static final int MOBILE_VALUE = 0;
      /**
       * <code>HOME = 1;</code>
       */
      public static final int HOME_VALUE = 1;
      /**
       * <code>WORK = 2;</code>
       */
      public static final int WORK_VALUE = 2;


      public final int getNumber() {
        if (this == UNRECOGNIZED) {
          throw new java.lang.IllegalArgumentException(
              "Can't get the number of an unknown enum value.");
        }
        return value;
      }

      /**
       * @deprecated Use {@link #forNumber(int)} instead.
       */
      @java.lang.Deprecated
      public static PhoneType valueOf(int value) {
        return forNumber(value);
      }

      public static PhoneType forNumber(int value) {
        switch (value) {
          case 0: return MOBILE;
          case 1: return HOME;
          case 2: return WORK;
          default: return null;
        }
      }

      public static com.google.protobuf.Internal.EnumLiteMap<PhoneType>
          internalGetValueMap() {
        return internalValueMap;
      }
      private static final com.google.protobuf.Internal.EnumLiteMap<
          PhoneType> internalValueMap =
            new com.google.protobuf.Internal.EnumLiteMap<PhoneType>() {
              public PhoneType findValueByNumber(int number) {
                return PhoneType.forNumber(number);
              }
            };

      public final com.google.protobuf.Descriptors.EnumValueDescriptor
          getValueDescriptor() {
        return getDescriptor().getValues().get(ordinal());
      }
      public final com.google.protobuf.Descriptors.EnumDescriptor
          getDescriptorForType() {
        return getDescriptor();
      }
      public static final com.google.protobuf.Descriptors.EnumDescriptor
          getDescriptor() {
        return com.example.tutorial.AddressBookProtos.Person.getDescriptor().getEnumTypes().get(0);
      }

      private static final PhoneType[] VALUES = values();

      public static PhoneType valueOf(
          com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
        if (desc.getType() != getDescriptor()) {
          throw new java.lang.IllegalArgumentException(
            "EnumValueDescriptor is not for this type.");
        }
        if (desc.getIndex() == -1) {
          return UNRECOGNIZED;
        }
        return VALUES[desc.getIndex()];
      }

      private final int value;

      private PhoneType(int value) {
        this.value = value;
      }

      // @@protoc_insertion_point(enum_scope:tutorial.Person.PhoneType)
    }

    public interface PhoneNumberOrBuilder extends
        // @@protoc_insertion_point(interface_extends:tutorial.Person.PhoneNumber)
        com.google.protobuf.MessageOrBuilder {

      /**
       * <code>string number = 1;</code>
       */
      java.lang.String getNumber();
      /**
       * <code>string number = 1;</code>
       */
      com.google.protobuf.ByteString
          getNumberBytes();

      /**
       * <code>.tutorial.Person.PhoneType type = 2;</code>
       */
      int getTypeValue();
      /**
       * <code>.tutorial.Person.PhoneType type = 2;</code>
       */
      com.example.tutorial.AddressBookProtos.Person.PhoneType getType();
    }
    /**
     * Protobuf type {@code tutorial.Person.PhoneNumber}
     */
    public  static final class PhoneNumber extends
        com.google.protobuf.GeneratedMessageV3 implements
        // @@protoc_insertion_point(message_implements:tutorial.Person.PhoneNumber)
        PhoneNumberOrBuilder {
    private static final long serialVersionUID = 0L;
      // Use PhoneNumber.newBuilder() to construct.
      private PhoneNumber(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
        super(builder);
      }
      private PhoneNumber() {
        number_ = "";
        type_ = 0;
      }

      @java.lang.Override
      public final com.google.protobuf.UnknownFieldSet
      getUnknownFields() {
        return this.unknownFields;
      }
      private PhoneNumber(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        this();
        if (extensionRegistry == null) {
          throw new java.lang.NullPointerException();
        }
        int mutable_bitField0_ = 0;
        com.google.protobuf.UnknownFieldSet.Builder unknownFields =
            com.google.protobuf.UnknownFieldSet.newBuilder();
        try {
          boolean done = false;
          while (!done) {
            int tag = input.readTag();
            switch (tag) {
              case 0:
                done = true;
                break;
              case 10: {
                java.lang.String s = input.readStringRequireUtf8();

                number_ = s;
                break;
              }
              case 16: {
                int rawValue = input.readEnum();

                type_ = rawValue;
                break;
              }
              default: {
                if (!parseUnknownFieldProto3(
                    input, unknownFields, extensionRegistry, tag)) {
                  done = true;
                }
                break;
              }
            }
          }
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          throw e.setUnfinishedMessage(this);
        } catch (java.io.IOException e) {
          throw new com.google.protobuf.InvalidProtocolBufferException(
              e).setUnfinishedMessage(this);
        } finally {
          this.unknownFields = unknownFields.build();
          makeExtensionsImmutable();
        }
      }
      public static final com.google.protobuf.Descriptors.Descriptor
          getDescriptor() {
        return com.example.tutorial.AddressBookProtos.internal_static_tutorial_Person_PhoneNumber_descriptor;
      }

      @java.lang.Override
      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
          internalGetFieldAccessorTable() {
        return com.example.tutorial.AddressBookProtos.internal_static_tutorial_Person_PhoneNumber_fieldAccessorTable
            .ensureFieldAccessorsInitialized(
                com.example.tutorial.AddressBookProtos.Person.PhoneNumber.class, com.example.tutorial.AddressBookProtos.Person.PhoneNumber.Builder.class);
      }

      public static final int NUMBER_FIELD_NUMBER = 1;
      private volatile java.lang.Object number_;
      /**
       * <code>string number = 1;</code>
       */
      public java.lang.String getNumber() {
        java.lang.Object ref = number_;
        if (ref instanceof java.lang.String) {
          return (java.lang.String) ref;
        } else {
          com.google.protobuf.ByteString bs = 
              (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          number_ = s;
          return s;
        }
      }
      /**
       * <code>string number = 1;</code>
       */
      public com.google.protobuf.ByteString
          getNumberBytes() {
        java.lang.Object ref = number_;
        if (ref instanceof java.lang.String) {
          com.google.protobuf.ByteString b = 
              com.google.protobuf.ByteString.copyFromUtf8(
                  (java.lang.String) ref);
          number_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }

      public static final int TYPE_FIELD_NUMBER = 2;
      private int type_;
      /**
       * <code>.tutorial.Person.PhoneType type = 2;</code>
       */
      public int getTypeValue() {
        return type_;
      }
      /**
       * <code>.tutorial.Person.PhoneType type = 2;</code>
       */
      public com.example.tutorial.AddressBookProtos.Person.PhoneType getType() {
        @SuppressWarnings("deprecation")
        com.example.tutorial.AddressBookProtos.Person.PhoneType result = com.example.tutorial.AddressBookProtos.Person.PhoneType.valueOf(type_);
        return result == null ? com.example.tutorial.AddressBookProtos.Person.PhoneType.UNRECOGNIZED : result;
      }

      private byte memoizedIsInitialized = -1;
      @java.lang.Override
      public final boolean isInitialized() {
        byte isInitialized = memoizedIsInitialized;
        if (isInitialized == 1) return true;
        if (isInitialized == 0) return false;

        memoizedIsInitialized = 1;
        return true;
      }

      @java.lang.Override
      public void writeTo(com.google.protobuf.CodedOutputStream output)
                          throws java.io.IOException {
        if (!getNumberBytes().isEmpty()) {
          com.google.protobuf.GeneratedMessageV3.writeString(output, 1, number_);
        }
        if (type_ != com.example.tutorial.AddressBookProtos.Person.PhoneType.MOBILE.getNumber()) {
          output.writeEnum(2, type_);
        }
        unknownFields.writeTo(output);
      }

      @java.lang.Override
      public int getSerializedSize() {
        int size = memoizedSize;
        if (size != -1) return size;

        size = 0;
        if (!getNumberBytes().isEmpty()) {
          size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, number_);
        }
        if (type_ != com.example.tutorial.AddressBookProtos.Person.PhoneType.MOBILE.getNumber()) {
          size += com.google.protobuf.CodedOutputStream
            .computeEnumSize(2, type_);
        }
        size += unknownFields.getSerializedSize();
        memoizedSize = size;
        return size;
      }

      @java.lang.Override
      public boolean equals(final java.lang.Object obj) {
        if (obj == this) {
         return true;
        }
        if (!(obj instanceof com.example.tutorial.AddressBookProtos.Person.PhoneNumber)) {
          return super.equals(obj);
        }
        com.example.tutorial.AddressBookProtos.Person.PhoneNumber other = (com.example.tutorial.AddressBookProtos.Person.PhoneNumber) obj;

        boolean result = true;
        result = result && getNumber()
            .equals(other.getNumber());
        result = result && type_ == other.type_;
        result = result && unknownFields.equals(other.unknownFields);
        return result;
      }

      @java.lang.Override
      public int hashCode() {
        if (memoizedHashCode != 0) {
          return memoizedHashCode;
        }
        int hash = 41;
        hash = (19 * hash) + getDescriptor().hashCode();
        hash = (37 * hash) + NUMBER_FIELD_NUMBER;
        hash = (53 * hash) + getNumber().hashCode();
        hash = (37 * hash) + TYPE_FIELD_NUMBER;
        hash = (53 * hash) + type_;
        hash = (29 * hash) + unknownFields.hashCode();
        memoizedHashCode = hash;
        return hash;
      }

      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          java.nio.ByteBuffer data)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          java.nio.ByteBuffer data,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data, extensionRegistry);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          com.google.protobuf.ByteString data)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          com.google.protobuf.ByteString data,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data, extensionRegistry);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(byte[] data)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          byte[] data,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data, extensionRegistry);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(java.io.InputStream input)
          throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3
            .parseWithIOException(PARSER, input);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          java.io.InputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3
            .parseWithIOException(PARSER, input, extensionRegistry);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseDelimitedFrom(java.io.InputStream input)
          throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3
            .parseDelimitedWithIOException(PARSER, input);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseDelimitedFrom(
          java.io.InputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3
            .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          com.google.protobuf.CodedInputStream input)
          throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3
            .parseWithIOException(PARSER, input);
      }
      public static com.example.tutorial.AddressBookProtos.Person.PhoneNumber parseFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        return com.google.protobuf.GeneratedMessageV3
            .parseWithIOException(PARSER, input, extensionRegistry);
      }

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      // @@protoc_insertion_point(builder_scope:tutorial.Person)
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    // @@protoc_insertion_point(class_scope:tutorial.Person)
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  /**
   * <pre>
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    internal_static_tutorial_Person_fieldAccessorTable = new
      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
        internal_static_tutorial_Person_descriptor,
        new java.lang.String[] { "Name", "Id", "Email", "Phones", "LastUpdated", });
    internal_static_tutorial_Person_PhoneNumber_descriptor =
      internal_static_tutorial_Person_descriptor.getNestedTypes().get(0);
    internal_static_tutorial_Person_PhoneNumber_fieldAccessorTable = new
      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
        internal_static_tutorial_Person_PhoneNumber_descriptor,
        new java.lang.String[] { "Number", "Type", });
    internal_static_tutorial_AddressBook_descriptor =
      getDescriptor().getMessageTypes().get(1);
    internal_static_tutorial_AddressBook_fieldAccessorTable = new
      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
        internal_static_tutorial_AddressBook_descriptor,
        new java.lang.String[] { "People", });
    com.google.protobuf.TimestampProto.getDescriptor();
  }

  // @@protoc_insertion_point(outer_class_scope)
}
```

## 使用方法

以下のように、生成されたモデルコードにアクセスすることができます。

```
            val john = Person.newBuilder()
                    .setId(1234)
                    .setName("John Doe")
                    .setEmail("jdoe@example.com")
                    .addPhones(
                            Person.PhoneNumber.newBuilder()
                                    .setNumber("555-4321")
                                    .setType(Person.PhoneType.HOME)
                    ).build()
```