KanmobaInKanto

Transcript

1. Pluggable Annotation ProcessingͰ
   KotlinͷίʔυΛੜ੒͢Δ
   ؔϞό in ؔ౦
   @takuji31
   

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2. @takuji31
   (Takuji Nishibayashi)
   Application Engineer at Hatena
   

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

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4. AGENDA
   • Pluggable Annotation Processing
   • KotlinPoet
   

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5. Pluggable
   Annotation
   Processing
   

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6. JavaͰιʔείʔυʹ෇༩͞Εͨ஫
   ऍΛղऍͯ͠ɺιʔείʔυΛੜ੒
   ͢Δ࢓૊Έ
   

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7. Α͘APTͬͯݺͿ(ݺͼؒҧ͑ΒΕ
   Δ΍ͭ)Ͱ͢Ͷ
   

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8. APT͸Deprecatedʹͳ͍ͬͯΔ
   

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9. Pluggable Annotation Processiong
   ͱͪΌΜͱݺͼ·͠ΐ͏
   

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10. Data Binding
    

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11. Dagger2
    

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12. ButterKnife
    

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13. etc.
    

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14. ࢖͍ํ
    

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15. ࢖͍ํ ࡞Γํ
    

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16. AbstractAnnotationProcessorΛ
    ܧঝ
    

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17. processΛ࣮૷
    

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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, roundEnv: RoundEnvironment): Boolean {
    // do something
    return true
    }
    }
    

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19. ࣮͸Kotlinͷ
    ίʔυ΋ੜ੒Ͱ͖Δ
    

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20. Kotlin
    ͷίʔυ΋ੜ੒Ͱ͖Δʂ
    

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21. େࣄͳ͜ͱͰ͢Ͷ
    

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22. ੜ੒͢Δίʔυ΋Kotlinʹ͍ͨ͠
    

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23. ͔͠͠खͰॻ͘ͷ͸໘౗
    

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24. KotlinPoet
    

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25. JavaPoetͷKotlin൛
    

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

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27. ίʔυੜ੒ͯ͠ΈΔ
    

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28. 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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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()
    

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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()
    

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

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

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33. !
    

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34. ͜ΕΛAnnotation Processor্Ͱ࣮
    ߦͯ͠΍Ε͹Α͍
    

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35. Ͳ͏΍ͬͯॻ͖ग़͢ͷ͔ʁ
    

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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))
    

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37. kaptͷ࣮ߦޙʹίϯύΠϧ͞ΕΔ
    

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38. ※ ੜ੒͞ΕͨΫϥεΛ
    ࠶౓ॲཧͰ͖ͳ͍
    

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39. Javaͷ࣌ͱҧ͏ͷͰཁ஫ҙ
    

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40. Annotation Processor࡞ͬͨ
    

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41. R.kt
    

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42. Android͕ੜ੒͢ΔR.javaͷ͍͢͝
    ΍ͭ
    

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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
    }
    }
    

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44. takuji31/R.kt
    

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45. ࠓ͸·ͩಈ͔ͳ͍ !
    

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46. ੜ੒͞ΕͨίʔυΛIDE͕ೝࣝͰ͖
    ͳ͍
    

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47. https://youtrack.jetbrains.com/
    issue/KT-20269
    

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48. 1.2Ͱ௚ΔͬΆ͍…ʁ
    

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49. Enjoy Annotation Processing !
    

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