KanmobaInKanto - Speaker Deck

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Pluggable Annotation ProcessingͰ KotlinͷίʔυΛੜ੒͢Δ ؔϞό in ؔ౦ @takuji31

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@takuji31 (Takuji Nishibayashi) Application Engineer at Hatena

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Loves • ! (AVG 175) • " # • http://photo.takuji31.jp • $ • http://nazuna.takuji31.jp • Android • Kotlin

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AGENDA • Pluggable Annotation Processing • KotlinPoet

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Pluggable Annotation Processing

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JavaͰιʔείʔυʹ෇༩͞Εͨ஫ ऍΛղऍͯ͠ɺιʔείʔυΛੜ੒ ͢Δ࢓૊Έ

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Α͘APTͬͯݺͿ(ݺͼؒҧ͑ΒΕ Δ΍ͭ)Ͱ͢Ͷ

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APT͸Deprecatedʹͳ͍ͬͯΔ

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Pluggable Annotation Processiong ͱͪΌΜͱݺͼ·͠ΐ͏

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Data Binding

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Dagger2

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ButterKnife

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etc.

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࢖͍ํ

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࢖͍ํ ࡞Γํ

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AbstractAnnotationProcessorΛ ܧঝ

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processΛ࣮૷

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ྫ // ιʔείʔυͷόʔδϣϯ @SupportedSourceVersion(SourceVersion.RELEASE_8) // ॲཧ͢ΔΞϊςʔγϣϯͷҰཡ @SupportedAnnotationTypes("jp.takuji31.annotations.SomeAnnotation") // αϙʔτ͢ΔΦϓγϣϯ @SupportedOptions("kapt.kotlin.generated") class ExampleProcessor : AbstractProcessor() { override fun process(annotations: MutableSet, roundEnv: RoundEnvironment): Boolean { // do something return true } }

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࣮͸Kotlinͷ ίʔυ΋ੜ੒Ͱ͖Δ

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Kotlin ͷίʔυ΋ੜ੒Ͱ͖Δʂ

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େࣄͳ͜ͱͰ͢Ͷ

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ੜ੒͢Δίʔυ΋Kotlinʹ͍ͨ͠

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͔͠͠खͰॻ͘ͷ͸໘౗

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KotlinPoet

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JavaPoetͷKotlin൛

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https://github.com/square/ kotlinpoet/

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ίʔυੜ੒ͯ͠ΈΔ

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ΫϥεΛ࡞Δ val packageName = "jp.takuji31.kanmoba" val userClassName = ClassName(packageName = packageName, simpleName = "User") val userClass = TypeSpec .classBuilder(userClassName) .addModifiers(KModifier.DATA) .build()

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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()

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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()

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ग़ྗ val kotlinFile = KotlinFile.builder(packageName, "User") .addType(userClass) .build() print(kotlinFile.toString())

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݁Ռ package jp.takuji31.kanmoba import kotlin.Int import kotlin.String data class User(val id: Int, val name: String)

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͜ΕΛAnnotation Processor্Ͱ࣮ ߦͯ͠΍Ε͹Α͍

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Ͳ͏΍ͬͯॻ͖ग़͢ͷ͔ʁ

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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))

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kaptͷ࣮ߦޙʹίϯύΠϧ͞ΕΔ

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※ ੜ੒͞ΕͨΫϥεΛ ࠶౓ॲཧͰ͖ͳ͍

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Javaͷ࣌ͱҧ͏ͷͰཁ஫ҙ

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Annotation Processor࡞ͬͨ

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R.kt

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Android͕ੜ੒͢ΔR.javaͷ͍͢͝ ΍ͭ

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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 } }