// A simple Demeter/Java program for computing averages

Container {
  traversal allWeights(
    CheckingVisitor cV,
    SummingVisitor sV
    ) {
    to Weight;}

  (@
// traverse while counting and summing
  void checkCapacity() throws Exception {
    // adaptive specification of objects using parsing
    SummingVisitor sV = SummingVisitor.parse("0");
    CheckingVisitor cV = new CheckingVisitor(sV, new Integer(0));
    this.allWeights(cV, sV);
  }
  @)
}
SummingVisitor {
  before Weight (@ System.out.println("sum " + total.intValue()); total = new 
    Integer(total.intValue() + host.get_i().intValue()); @)
}

CheckingVisitor {
  before Container (@ this.set_initial(sV.get_total()); 
    System.out.println(" start new container "); @)
  after  Container (@
    int cap = host.get_capacity().get_i().intValue();
    int diff = sV.get_total().intValue() - 
	  this.get_initial().intValue();
    if (diff > host.get_capacity().get_i().intValue())
      { System.out.println(" total weight " + 
	diff + " but limit is = " + cap + " OVER CAPACITY "); };
    System.out.println(" end container "); 
  @)
}


Main {
(@
  static public void main(String args[]) throws Exception {

    Runtime rt = Runtime.getRuntime();
    rt.traceMethodCalls(true);

    Container a = Container.parse(System.in);

    a.checkCapacity();

    System.out.println("done ");
  }
@)
}