org.wartremover.warts.GetOrElseNull.scala Maven / Gradle / Ivy
package org.wartremover
package warts
object GetOrElseNull extends WartTraverser {
def apply(u: WartUniverse): u.Traverser = {
import u.universe._
val opt = rootMirror.staticClass("scala.Option").toTypeConstructor
new u.Traverser {
override def traverse(tree: Tree): Unit = {
tree match {
case _ if hasWartAnnotation(u)(tree) =>
case Apply(
TypeApply(
Select(left, TermName("getOrElse")),
_ :: Nil
),
Literal(Constant(null)) :: Nil
) if left.tpe.typeConstructor <:< opt =>
error(u)(tree.pos, "you can use orNull instead of getOrElse(null)")
case _ =>
super.traverse(tree)
}
}
}
}
}