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package kamon.tag
import java.lang.{Boolean => JBoolean, Long => JLong, String => JString}
/**
* Marker trait for allowed Tag implementations. Users are not meant to create implementations of this trait outside
* of Kamon. Furthermore, users of TagSet might never need to interact with these classes but rather perform lookups
* using the lookup DSL.
*/
sealed trait Tag {
def key: JString
}
object Tag {
/**
* Represents a String key pointing to a String value.
*/
trait String extends Tag {
def value: JString
}
/**
* Represents a String key pointing to a Boolean value.
*/
trait Boolean extends Tag {
def value: JBoolean
}
/**
* Represents a String key pointing to a Long value.
*/
trait Long extends Tag {
def value: JLong
}
/**
* Returns the value held inside of a Tag instance. This utility function is specially useful when iterating over
* tags but not caring about the concrete tag type.
*/
def unwrapValue(tag: Tag): Any = tag match {
case t: Tag.String => t.value
case t: Tag.Boolean => t.value
case t: Tag.Long => t.value
}
}
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