Question

I have a set of groovy scripts in package hierarchy. I have 1 main script, from which I want to call others. For example I have these scripts (with public classes/interfaces of the same name in them):

package.MainScript
package.MyInterface;

package.utils.MyInterfaceImpl1 //implements MyInterface
package.utils.MyInterfaceImpl2 //implements MyInterface

Is there a way to call one script from the other without knowing called class name at compile time? I mean to do something like dynamic class loading like:

class MainScript {
  public static void main (String[] args) {
      MyInterface instance = Class.forName("package.utils.Util1");
  }
}

Answer 1

Yeah! Groovy is a dynamic language. You can create class instance dynamically.

package.MyInterface
class MyInterfaceImpl1 {
    def greet() {
        "Hello"
    }    
}

package.MyInterface
class MyInterfaceImpl2 {
    def greet() {
        "Hi!"
    }   
}

def name = 'MyInterfaceImpl1' // Choose whatever you want at runtime
def className = Class.forName("MyInterface.$name")
def instance = className.newInstance()
assert instance.greet() == 'Hello'