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class PhoneNumberScreen(
private val phoneNumber: PhoneNumber
) {
init {
require(phoneNumber.value.isNotEmpty()) { "cannot handle invalid phone number" }
}
fun render() {
println("Phone number: ${phoneNumber.value}")
}
}
fun main() {
val contact = Contact(PhoneNumber("12345"))
show(contact.phoneNumber) // "Phone number: 12345"
val contactWithInvalidPhoneNumber = Contact(PhoneNumber(""))
show(contactWithInvalidPhoneNumber.phoneNumber) // prints nothing
}
private fun show(phoneNumber: PhoneNumber) {
try {
val phoneNumberScreen = PhoneNumberScreen(phoneNumber)
phoneNumberScreen.render()
} catch (ex: IllegalArgumentException) {
}
}
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