@TaskAction
    fun generate(): Unit =
        destinationFile.get().asFile.let {
            if (sources.isEmpty) it.writeText("")
            else generateParameterNamesResource(sources.files, classpath.files, it)
        }

    private
    fun generateParameterNamesResource(sources: Set<File>, classpath: Set<File>, destinationFile: File) {
        val index = extractParameterNamesIndexFrom(sources, classpath)