Scala Language Annotations Creating Your Own Annotations
Example
You can create you own Scala annotations by creating classes derived from scala.annotation.StaticAnnotation or scala.annotation.ClassfileAnnotation
package animals
// Create Annotation `Mammal`
class Mammal(indigenous:String) extends scala.annotation.StaticAnnotation
// Annotate class Platypus as a `Mammal`
@Mammal(indigenous = "North America")
class Platypus{}
Annotations can then be interrogated using the reflection API.
scala>import scala.reflect.runtime.{universe ⇒ u}
scala>val platypusType = u.typeOf[Platypus]
platypusType: reflect.runtime.universe.Type = animals.reflection.Platypus
scala>val platypusSymbol = platypusType.typeSymbol.asClass
platypusSymbol: reflect.runtime.universe.ClassSymbol = class Platypus
scala>platypusSymbol.annotations
List[reflect.runtime.universe.Annotation] = List(animals.reflection.Mammal("North America"))
