izumi.fundamentals.reflection.JSRAnnotationTools.scala Maven / Gradle / Ivy
package izumi.fundamentals.reflection
import scala.reflect.api.Universe
object JSRAnnotationTools {
/** This method extracts names from annotations with shape of JSR-330 Named annotation:
*
*
* public @interface Named {
* String value() default "";
* }
*
*
* The package name is being ignored
*/
def uniqueJSRNameAnno(u: Universe)(annos: List[u.Annotation]): Option[String] = {
val maybeJSR = annos
.collect {
case a: u.AnnotationApi =>
a.tree.children match {
case (select: u.SelectApi) :: (value: u.AssignOrNamedArgApi) :: Nil =>
(select.children.headOption, value.lhs, value.rhs) match {
case (Some(n: u.NewApi), i: u.IdentApi, v: u.LiteralApi) if v.value.value.isInstanceOf[String] && i.name.toString == "value" =>
n.children match {
case (head: u.TypeTreeApi) :: Nil if head.symbol.name.toString == "Named" =>
Some(v.value.value.asInstanceOf[String])
case _ =>
None
}
case _ =>
None
}
case _ =>
Option.empty[String]
}
}
.collect {
case Some(name) => name
}
maybeJSR match {
case unique :: Nil =>
Some(unique)
case _ =>
None
}
}
}