科特林诗人菲力牛排没有生成

Question

我尝试创建一个带有注解处理器和 Kotlin Poet 的 class。这是我的代码：

@AutoService(Processor::class)
class TailProcessor : AbstractProcessor() {

    override fun process(elementTypeSet: MutableSet<out TypeElement>?, roundEnvironment: RoundEnvironment?): Boolean {
        roundEnvironment?.getElementsAnnotatedWith(Tail::class.java)?.forEach {
            if (it.javaClass.kotlin.isData) {
                print("You are doing it right")
                val className = it.simpleName.toString()
                val pack = processingEnv.elementUtils.getPackageOf(it).toString()
                val variables = ElementFilter.fieldsIn(elementTypeSet)
                startClassGeneration(className, pack, variables)
            } else {
                return false
            }
        }
        return false
    }

    override fun getSupportedSourceVersion(): SourceVersion = SourceVersion.latest()

    override fun getSupportedAnnotationTypes(): MutableSet<String> = mutableSetOf(Tail::class.java.name)

    private fun startClassGeneration(
        className: String,
        pack: String,
        variables: MutableSet<VariableElement>
    ) {
        val fileName = "Tail$className"
        val stringToBePrinted = generateStringFromIncommingValues(variables)
        val printFunction = FunSpec.builder("print").addCode("print($stringToBePrinted)").build()
        val generatedClass = TypeSpec.objectBuilder(fileName).addFunction(printFunction).build()
        val file = FileSpec.builder(pack, fileName).addType(generatedClass).build()
        val kaptKotlinGeneratedDir = processingEnv.options[KOTLIN_DIRECTORY_NAME]
        file.writeTo(File(kaptKotlinGeneratedDir, "$fileName.kt"))
    }

    private fun generateStringFromIncommingValues(variables: MutableSet<VariableElement>): Any {
        val stringBuilder = StringBuilder()
        variables.forEach {
            if (it.constantValue == null) {
                stringBuilder.append("null\n ")
            } else {
                stringBuilder.append("${it.constantValue}\n")
            }
        }
        return stringBuilder.toString()
    }

    companion object {
        const val KOTLIN_DIRECTORY_NAME = "sxhardha.tail"
    }
}

问题，目录和文件没有生成。我尝试重建、使缓存无效 + 重新启动、清理，但其中 none 有效。构建成功，没有任何错误，但我没有看到任何变化。你能检查出什么问题了吗？

Answer 1

我确实发现了问题。我没有正确检查 class 是否是 data class 并且从未满足条件。

而不是：

it.javaClass.kotlin.isData

应该是：

it.kotlinMetadata as KotlinClassMetadata).data.classProto.isDataClass

但是只能用这个库来实现here.

科特林诗人菲力牛排没有生成

Kotlin poet filet not getting generated

annotation-processing

kotlin

kotlinpoet