code: public static MethodNode addDelegateStaticMethod(ClassNode classNode, MethodNode delegateMethod) {
          ClassExpression classExpression = new ClassExpression(delegateMethod.getDeclaringClass());
          return addDelegateStaticMethod(classExpression, classNode, delegateMethod);
      }
docs: Adds a static method call to given class node that delegates to the given method
  
  @param classNode The class node
  @param delegateMethod The delegate method
  @return The added method node or null if it couldn't be added