PII Masking Logger decorator and usage

Logging.kt

object Logging {
    inline fun <reified T : Any> loggerFor(): Logger = PIIMaskingLogger(LoggerFactory.getLogger(T::class.java))
    fun loggerForCompanion(c: Any): Logger = PIIMaskingLogger(LoggerFactory.getLogger(c.javaClass.enclosingClass))
}

PIIMaskingLogger.kt

class PIIMaskingLogger(val logger: Logger) : Logger by logger {
    override fun error(format: String?, arg: Any?) = logger.error(format, mask(arg))
    //...
    override fun warn(format: String?, arg: Any?) = logger.error(format, mask(arg))
    // ...
    override fun info(format: String?, arg: Any?) = logger.error(format, mask(arg))
    // ...
    private fun mask(arg: Any?): String? = when {
        arg == null -> arg
        Configuration.accept(arg::class.java) -> PIIMaskingToStringBuilder.toString(arg)
        else -> arg.toString()
    }
}

UsageExample.kt

...
val LOGGER = Logging.loggerFor<Application>()
...
val customer: Customer = Customer(...)
LOGGER.info("a template message with PII {}", customer)
...
//will produce a log message like:
//a template message with PII Customer(id=c91d4517-72d8-498d-a089-98a341195410, name=***, passportNumber=***