DynScala

Fan language supports dynamic method dispatch using operator ->
DynScala brings this feature to Scala using an ugly operator -->'

Sample:

scala> import dynscala.DynScala._
import dynscala.DynScala._

scala> val s = "i am a string"
s: java.lang.String = i am a string

scala> implicit val trap = fail[Any] // inserts default method missing handler
...

scala> s-->'nonExistingMethod("foo", "bar")
dynscala.DynScala$MethodMissingError: method missing nonExistingMethod(foo, bar)
      at dynscala.DynScala$Meta$.dynscala$DynScala$Meta$$fail(DynScala.scala:51)
      at dynscala.DynScala$Meta$$anonfun$2.apply(DynScala.scala:41)
      at dynscala.DynScala$Meta$$anonfun$2.apply(DynScala.scala:41)
      at dy...

scala> implicit val trap = new Trap[String] { 
         def apply(s: String, site: CallSite) = println("hah, trapped " + s + " " + site) 
       } // inserts method missing handler for String type

scala> s-->'nonExistingMethod("foo", "bar")
hah, trapped i am a string nonExistingMethod(foo, bar)

DynQuery example:

File src/test/scala/example/DynQuery.scala contains a simple example providing
Grails like query builder (well, without any features to make it useful).

case class Book(title: String, date: java.util.Date, author: String)

val q1 = Book-->'findByTitle("The Stand")
val q2 = Book-->'findByTitleLike("Harry Pot%")
val q3 = Book-->'findByDateGreaterThan(someDate)

assert(q1 == "select author,date,title from book where title='The Stand'")
assert(q2 == "select author,date,title from book where title like 'Harry Pot%'")
assert(q3 == "select author,date,title from book where date > '" + someDate + "'")