Delegating SharedPreferences into parameters

DataCaptionInfo.kt

data class DataCaptionInfo(private val context: Context) {

    var name: String by Delegate.prefParam(context,"NAME", "")

    var lastName: String by Delegate.prefParam(context, "LAST_NAME", "")

    var email : String by Delegate.prefParam(context, "EMAIL", "")

    var referalCode: String by Delegate.prefParam(context, "REFERAL_ID", "")

    fun clean() {
        name = ""
        lastName = ""
        email = ""
        referalCode = ""
    }

}

DelegateExtesions.kt

object Delegate {

  fun <Param> prefParam(activity: Context, name: String, default: Param) = PrefParam(activity, name, default)
  
}


class PrefParam<Param>(val context: Context, val name: String, val default: Param) : ReadWriteProperty<Any, Param> {

    val sharedPreferences: SharedPreferences by lazy { PreferenceManager.getDefaultSharedPreferences(context) }

    override fun getValue(thisRef: Any, property: KProperty<*>): Param {
        return findPreference(name, default)
    }

    override fun setValue(thisRef: Any, property: KProperty<*>, value: Param) {
        putPreference(name, value)
    }

    @Suppress("UNCHECKED_CAST")
    private fun <U> findPreference(name: String, default: U): U = with(sharedPreferences) {
        val res: Any = when (default) {
            is Long -> getLong(name, default)
            is String -> getString(name, default)
            is Int -> getInt(name, default)
            is Boolean -> getBoolean(name, default)
            is Float -> getFloat(name, default)
            else -> throw java.lang.IllegalArgumentException("This type can be saved into Preferences")
        }

        res as U
    }

    private fun <U> putPreference(name: String, value: U) = with(sharedPreferences.edit()) {
        when (value) {
            is Long -> putLong(name, value)
            is String -> putString(name, value)
            is Int -> putInt(name, value)
            is Boolean -> putBoolean(name, value)
            is Float -> putFloat(name, value)
            else -> throw java.lang.IllegalArgumentException("This type can be saved into Preferences")
        }.apply()
    }

}

UsageActivity.kt

class DataCaptionActivity : Activity(){

    private var dataCaptionInfo = DataCaptionInfo(this)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        dataCaptionInfo.name = "Marc" //actualitzat a shared preferences
    }
  
  override fun onDestroy() {
      dataCaptionInfo.clean()
  }
}