Refactor build to use sbt-crossproject

1 files changed, 22 insertions, 0 deletions

diff --git a/shared/src/main/scala/annotations.scala b/shared/src/main/scala/annotations.scala
new file mode 100644
index 0000000..9d35d16
--- /dev/null
+++ b/shared/src/main/scala/annotations.scala
@@ -0,0 +1,22 @@
+package spray.json
+
+import scala.annotation.StaticAnnotation
+
+/** An annotation that designates that a sealed trait is a generalized algebraic
+  * datatype (GADT), and that a type field containing the serialized childrens'
+  * types should be added to the final JSON objects.
+  *
+  * Note that by default all sealed traits are treated as GADTs, with a type
+  * field called `type`. This annotation enables overriding the name of that
+  * field and is really only useful if a child itself has a field called `type`
+  * that would result in a conflict.
+  *
+  * Example:
+  * {{{
+  * // the JSON field "kind" will contain the actual type of the serialized child
+  * @gadt("kind") sealed abstract class Keyword(`type`: String)
+  * case class If(`type`: String) extends Keyword(`type`)
+  * }}}
+  * @param typeFieldName the name of the field to inject into a serialized JSON
+  *        object */
+final class gadt(val typeFieldName: String = "type") extends StaticAnnotation