Hi i am educating myself oop principles. I would like to know if this is a correct example of Cardellis definition of parametric polymorphism. Please enlighten me.
The example is in cfml's script based syntax.

<cfcomponent>
<cfscript>
public numeric function getlength(any arg, string type){
  switch (arguments.type){
    case "array":
      return arraylen(arguments.arg);
      break;
    case "struct":
      return structcount(arguments.arg);
      break;
    case "string":
      return len(arguments.arg);
      break;
    case "numeric":
      return len(arguments.arg);
      break;
    case "object":
      // gets the number of parent classes, substracting the railo base class
      return -1 + arraylen(structfindkey(getmetadata(arguments.arg),"extends","all"));
      break;
    default:
      // throw was added to railo as a user defined function to use it in cfscript
      throw("InvalidTypeArgument","The provided type argument is invalid for method getlength");
  }
}
</cfscript>
</cfcomponent>