KanmobaInKanto

1. Pluggable Annotation ProcessingͰ KotlinͷίʔυΛੜ੒͢Δ ؔϞό in ؔ౦ @takuji31
2. @takuji31 (Takuji Nishibayashi) Application Engineer at Hatena
3. Loves • ! (AVG 175) • " # • http://photo.takuji31.jp • $ • http://nazuna.takuji31.jp • Android • Kotlin
4. AGENDA • Pluggable Annotation Processing • KotlinPoet
5. Pluggable Annotation Processing
6. JavaͰιʔείʔυʹ෇༩͞Εͨ஫ ऍΛղऍͯ͠ɺιʔείʔυΛੜ੒ ͢Δ࢓૊Έ
7. Α͘APTͬͯݺͿ(ݺͼؒҧ͑ΒΕ Δ΍ͭ)Ͱ͢Ͷ
8. APT͸Deprecatedʹͳ͍ͬͯΔ
9. Pluggable Annotation Processiong ͱͪΌΜͱݺͼ·͠ΐ͏
10. Data Binding
11. Dagger2
12. ButterKnife
13. etc.
14. ࢖͍ํ
15. ࢖͍ํ ࡞Γํ
16. AbstractAnnotationProcessorΛ ܧঝ
17. processΛ࣮૷
18. ྫ // 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 } }
19. ࣮͸Kotlinͷ ίʔυ΋ੜ੒Ͱ͖Δ
20. Kotlin ͷίʔυ΋ੜ੒Ͱ͖Δʂ
21. େࣄͳ͜ͱͰ͢Ͷ
22. ੜ੒͢Δίʔυ΋Kotlinʹ͍ͨ͠
23. ͔͠͠खͰॻ͘ͷ͸໘౗
24. KotlinPoet
25. JavaPoetͷKotlin൛
26. https://github.com/square/ kotlinpoet/
27. ίʔυੜ੒ͯ͠ΈΔ
28. ΫϥεΛ࡞Δ val packageName = "jp.takuji31.kanmoba" val userClassName = ClassName(packageName = packageName, simpleName = "User") val userClass = TypeSpec .classBuilder(userClassName) .addModifiers(KModifier.DATA) .build()
29. 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()
30. 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()
31. ग़ྗ val kotlinFile = KotlinFile.builder(packageName, "User") .addType(userClass) .build() print(kotlinFile.toString())
32. ݁Ռ package jp.takuji31.kanmoba import kotlin.Int import kotlin.String data class User(val id: Int, val name: String)
33. !
34. ͜ΕΛAnnotation Processor্Ͱ࣮ ߦͯ͠΍Ε͹Α͍
35. Ͳ͏΍ͬͯॻ͖ग़͢ͷ͔ʁ
36. 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))
37. kaptͷ࣮ߦޙʹίϯύΠϧ͞ΕΔ
38. ※ ੜ੒͞ΕͨΫϥεΛ ࠶౓ॲཧͰ͖ͳ͍
39. Javaͷ࣌ͱҧ͏ͷͰཁ஫ҙ
40. Annotation Processor࡞ͬͨ
41. R.kt
42. Android͕ੜ੒͢ΔR.javaͷ͍͢͝ ΍ͭ
43. 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 } }
44. takuji31/R.kt
45. ࠓ͸·ͩಈ͔ͳ͍ !
46. ੜ੒͞ΕͨίʔυΛIDE͕ೝࣝͰ͖ ͳ͍
47. https://youtrack.jetbrains.com/ issue/KT-20269
48. 1.2Ͱ௚ΔͬΆ͍…ʁ
49. Enjoy Annotation Processing !