Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
KanmobaInKanto
Search
Takuji Nishibayashi
November 21, 2017
Technology
1
90
KanmobaInKanto
Takuji Nishibayashi
November 21, 2017
Tweet
Share
More Decks by Takuji Nishibayashi
See All by Takuji Nishibayashi
compose-hot-reload を試そうとした話
takuji31
0
90
CameraX使ってみた
takuji31
0
250
kotlinx.datetime 使ってみた
takuji31
0
800
HiltのCustom Componentについて
takuji31
0
290
java.timeをAndroidで使う
takuji31
0
140
KSPを使ってコード生成
takuji31
0
390
Kotlin Symbol Processing API (KSP) を使って Kotlin ア プリケーションの開発を効率化する
takuji31
1
2.9k
kotlinx.serialization
takuji31
0
620
kanmoba-returns-02.pdf
takuji31
0
240
Other Decks in Technology
See All in Technology
スマートファクトリーの第一歩 〜AWSマネージドサービスで 実現する予知保全と生成AI活用まで
ganota
2
220
実践!カスタムインストラクション&スラッシュコマンド
puku0x
0
410
JTCにおける内製×スクラム開発への挑戦〜内製化率95%達成の舞台裏/JTC's challenge of in-house development with Scrum
aeonpeople
0
230
バイブスに「型」を!Kent Beckに学ぶ、AI時代のテスト駆動開発
amixedcolor
2
560
Webアプリケーションにオブザーバビリティを実装するRust入門ガイド
nwiizo
7
830
「どこから読む?」コードとカルチャーに最速で馴染むための実践ガイド
zozotech
PRO
0
450
AI開発ツールCreateがAnythingになったよ
tendasato
0
130
AIのグローバルトレンド2025 #scrummikawa / global ai trend
kyonmm
PRO
1
290
「何となくテストする」を卒業するためにプロダクトが動く仕組みを理解しよう
kawabeaver
0
410
人工衛星のファームウェアをRustで書く理由
koba789
15
7.9k
Automating Web Accessibility Testing with AI Agents
maminami373
0
1.3k
Codeful Serverless / 一人運用でもやり抜く力
_kensh
7
430
Featured
See All Featured
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3k
4 Signs Your Business is Dying
shpigford
184
22k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.9k
How to Ace a Technical Interview
jacobian
279
23k
The Language of Interfaces
destraynor
161
25k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
50k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
12
1.1k
Speed Design
sergeychernyshev
32
1.1k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
Transcript
Pluggable Annotation ProcessingͰ KotlinͷίʔυΛੜ͢Δ ؔϞό in ؔ౦ @takuji31
@takuji31 (Takuji Nishibayashi) Application Engineer at Hatena
Loves • ! (AVG 175) • " # • http://photo.takuji31.jp
• $ • http://nazuna.takuji31.jp • Android • Kotlin
AGENDA • Pluggable Annotation Processing • KotlinPoet
Pluggable Annotation Processing
JavaͰιʔείʔυʹ༩͞Εͨ ऍΛղऍͯ͠ɺιʔείʔυΛੜ ͢ΔΈ
Α͘APTͬͯݺͿ(ݺͼؒҧ͑ΒΕ Δͭ)Ͱ͢Ͷ
APTDeprecatedʹͳ͍ͬͯΔ
Pluggable Annotation Processiong ͱͪΌΜͱݺͼ·͠ΐ͏
Data Binding
Dagger2
ButterKnife
etc.
͍ํ
͍ํ ࡞Γํ
AbstractAnnotationProcessorΛ ܧঝ
processΛ࣮
ྫ // ιʔείʔυͷόʔδϣϯ @SupportedSourceVersion(SourceVersion.RELEASE_8) // ॲཧ͢ΔΞϊςʔγϣϯͷҰཡ @SupportedAnnotationTypes("jp.takuji31.annotations.SomeAnnotation") // αϙʔτ͢ΔΦϓγϣϯ @SupportedOptions("kapt.kotlin.generated")
class ExampleProcessor : AbstractProcessor() { override fun process(annotations: MutableSet<out TypeElement>, roundEnv: RoundEnvironment): Boolean { // do something return true } }
࣮Kotlinͷ ίʔυੜͰ͖Δ
Kotlin ͷίʔυੜͰ͖Δʂ
େࣄͳ͜ͱͰ͢Ͷ
ੜ͢ΔίʔυKotlinʹ͍ͨ͠
͔͠͠खͰॻ͘ͷ໘
KotlinPoet
JavaPoetͷKotlin൛
https://github.com/square/ kotlinpoet/
ίʔυੜͯ͠ΈΔ
ΫϥεΛ࡞Δ val packageName = "jp.takuji31.kanmoba" val userClassName = ClassName(packageName =
packageName, simpleName = "User") val userClass = TypeSpec .classBuilder(userClassName) .addModifiers(KModifier.DATA) .build()
ίϯετϥΫλʔΛఆٛ val userClass = TypeSpec .classBuilder(userClassName) .primaryConstructor( FunSpec .constructorBuilder() .addParameter(ParameterSpec
.builder("id", Int::class) .build() ) .addParameter(ParameterSpec .builder("name", String::class) .build() ) .build() ) .build()
ϓϩύςΟʔΛఆٛ val userClass = TypeSpec .classBuilder(userClassName) .addProperty( PropertySpec .builder("id", Int::class)
.initializer("id") .build() ) .addProperty( PropertySpec .builder("name", String::class) .initializer("name") .build() ) .build()
ग़ྗ val kotlinFile = KotlinFile.builder(packageName, "User") .addType(userClass) .build() print(kotlinFile.toString())
݁Ռ package jp.takuji31.kanmoba import kotlin.Int import kotlin.String data class User(val
id: Int, val name: String)
!
͜ΕΛAnnotation Processor্Ͱ࣮ ߦͯ͠ΕΑ͍
Ͳ͏ͬͯॻ͖ग़͢ͷ͔ʁ
ॻ͖ग़͢ val generatedDir = processingEnv.options["kapt.kotlin.generated"] ?: throw IllegalStateException("Needs kapt support.")
KotlinFile.builder(packageName = packageName, fileName = "User") .addType(userClass.build()) .build() .writeTo(File(generatedDir))
kaptͷ࣮ߦޙʹίϯύΠϧ͞ΕΔ
※ ੜ͞ΕͨΫϥεΛ ࠶ॲཧͰ͖ͳ͍
Javaͷ࣌ͱҧ͏ͷͰཁҙ
Annotation Processor࡞ͬͨ
R.kt
Android͕ੜ͢ΔR.javaͷ͍͢͝ ͭ
Πϝʔδ class MainActivity() : Activity() { val R by lazy
{ RKt(context = this) } fun onCreate(savedInstanceState: Bundle?) { // ic_launcher.png val icon: Drawable = R.drawable.ic_launcher.asDrawable() // Hello %1$s val message: String = R.string.welcome_message.format("Kanmoba") // Hello Kanmoba } }
takuji31/R.kt
ࠓ·ͩಈ͔ͳ͍ !
ੜ͞ΕͨίʔυΛIDE͕ೝࣝͰ͖ ͳ͍
https://youtrack.jetbrains.com/ issue/KT-20269
1.2ͰΔͬΆ͍…ʁ
Enjoy Annotation Processing !