Question

I have a Scala function which passes message of type ‘Any’. In most cases it will be a tuple of size 2. The function that receives this message needs to see the specific types of the tuple elements:

main() {
// call to function
// msg is of type Any.
    func (msg) 
}

Now in my function,

function (msg : Any) {
    String inputType = msg.getClass.getCanonicalName
    if (inputType.compareTo("scala.Tuple2") == 0) {
        // I now know that the input to the function is a tuple..I want to extract the type of each element in this tuple.
        //something like:
        var tuple = msg.asInstanceof(scala.Tuple2) // This line gives an error. I want to cast object of Type Any to a tuple.
        var 1type = tuple._1.getClass.getCanonicalName
        var 2type = tuple._2.getClass.getCanonicalName
    }
}

Answer 1

Why don’t you just use pattern matching?

def function(msg: Any) = {
  msg match {
    case tuple @ (a: Any, b: Any) => tuple
  }
}