Created
October 29, 2019 01:44
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an way to get typesafe configuration through raw map
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| package config | |
| trait ConfigurationKey[T] { | |
| private[config] final def withConfig(rawConfig: Map[String, String]): Option[T] = read(rawConfig) | |
| protected def read(cfg: Map[String, String]): Option[T] | |
| } | |
| abstract class ConfigurationHolder[Config[_]] { | |
| protected def configMap: Map[String, String] | |
| final def read[T](key: Config[T])(implicit ev: Config[T] <:< ConfigurationKey[T]): Option[T] = key.withConfig(configMap) | |
| } | |
| abstract class SimpleConfigurationKey[T](name: String, conversion: String => T) { | |
| def read(cfg: Map[String, String]): Option[T] = Try{ | |
| cfg.get(name).map(conversion) | |
| }.toOption.flatten | |
| } | |
| object config{ | |
| sealed trait ExampleConfig[T] extends ConfigurationKey[T] | |
| final case object ReadSomeConfig extends SimpleConfigurationKey[Long]("config_key", _.toLong) with ExampleConfig[Long] | |
| final case class ExampleHolder(rawConfig: Map[String, String]){ | |
| val config: ConfigurationHolder[ExampleConfig] = new ConfigurationHolder[ExampleConfig]{ | |
| override def configMap: Map[String, String] = rawConfig | |
| } | |
| } | |
| } |
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