[mod][fix] modified getParam to allow for None if it doesn't exist

- this allows for optional parameters
 - [fix] only catch NonFatal errors in getParam

src/main/scala/scim/datastruct/Configuration.scala

@@ -3,7 +3,9 @@ package scim.datastruct
 import scim.lib.ConcurrentBroadcast._
 import scim.lib.simInterfaces._
 import scim.lib.configInterfaces._
+
 import scala.collection.parallel.ForkJoinTaskSupport
+import scala.util.control.NonFatal
 
 // configuration
 //case class Configuration(simulation: Simulation, sensors: Vector[Sensor], groundTruths: Vector[GroundTruth], behaviours: Vector[Behaviour])
@@ -122,9 +124,12 @@ case class Group(name: String, sensorParent: Option[String] = None){
 
 case class Truth() extends Result[Option[Double]]
 case class FunctionArgs(args: Map[String, Any]) {
+  def getParam[A](param: String): Option[A] = {
+    // just try to get the param, otherwise use fallback
+    try { Some(args(param).asInstanceOf[A]) } catch { case NonFatal(_) => None }
+  }
   def getParam[A](param: String, fallback: A): A = {
-    // just bruteforce try to get the param, otherwise use fallback
-    try { args(param).asInstanceOf[A] } catch { case _: Throwable => fallback }
+    getParam(param).getOrElse(fallback)
   }
 }
 
@@ -141,7 +146,6 @@ case class Behaviour(behaviour: BehaviourVector){
     val functionTuple = behaviour.get(time)
     val function = functionTuple._1
     val args = functionTuple._2
-    // TODO: add try catch, to prevent crash in case the args are wrong
     function(cell, time, truth.get, args)
   }
 }

src/main/scala/scim/lib/Library.scala

@@ -317,13 +317,20 @@ package object mapUtil {
 
 package object behaviourUtil {
   implicit class FunctionArgsOption(optional: Option[FunctionArgs]) {
-    def getParam[B](param: String, fallback: B): B = {
+    def getParam[A](param: String, fallback: A): A = {
       if(optional.isEmpty) {
         fallback
       } else {
         optional.get.getParam(param, fallback)
       }
     }
+    def getParam[A](param: String): Option[A] = {
+      if(optional.isEmpty) {
+        None
+      } else {
+        optional.get.getParam(param)
+      }
+    }
   }
 }