Extract EMF Resource (type-)safely with Scala pattern matching

Producer.scala

import java.io.IOException

import org.eclipse.emf.ecore.EObject
import org.eclipse.emf.ecore.resource.Resource

import scala.collection.JavaConverters._
import scala.reflect.ClassTag

class TypesafeResourceExtractor[T <: EObject : ClassTag] {
  def extractResource(resource: Resource): T = {

    resource.getContents.asScala.headOption match {
      case None => throw new IOException("resource is empty")
      case Some(t: T) => t
      case Some(other) => throw new IOException(s"resource contains the wrong type: ${other.eClass().getName}")
    }
  }
}