Hi Binoy:

thank you for the test.

In principle, it should be possible to program just with around methods.
Do you have an idea why that did not work?

-- Karl

>From binoy@ccs.neu.edu Mon Nov 24 11:23:56 1997
>From: Binoy Samuel <binoy@ccs.neu.edu>
>To: Karl Lieberherr <lieber@ccs.neu.edu>
>CC: mira@ccs.neu.edu, dougo@ccs.neu.edu
>Subject: Re: Mira's style
>
>Karl Lieberherr wrote:
>> 
>> Hi Binoy:
>> 
>> how did the Demeter/Java program work out? Is it working?
>> 
>> -- Karl
>
>Here is my attempt at using inheritance instead of nesting for the
>visitors.
> /proj/asl/binoy/regression/suite-latest/j-rondo/  (program*)
>
>It was not possible to use only around methods to solve this. Neither
>was the option of using only before/after. In the end I had to use all
>the three.
>I didnt very much like my solution; one more level of inheritance, and
>this style would not be easy using visitors methods. Maybe there is a
>neater solution. Doug?
>
>---------.cd-------------
>// class dictionary
>(@
>import java.util.*;
>@)
>
>Container = "(" <contents> List(Item) <capacity> Capacity ")".
>Item : Container | Simple.
>
>Simple =  <name> Ident <w> Weight.
>Capacity = <i> int.
>Weight = <i> int.
>
>List(S) ~ {S}.
>
>*noparse*
>Main = .
>
>*visitors*
>SummingVisitor : InitialVisitor 
>		 *common*
>		 <total> int.
>InitialVisitor : CheckingVisitor 
>		 *common*
>		 <initial> int
>		 <stack> Stack.
>		 
>CheckingVisitor = <violations> int.
>
>---------.beh-----------
>// behavior
>Main {
>(@
>  static public void main(String args[]) throws Exception {
>
>    Container a = Container.parse(System.in);
>
>    int result = a.checkCapacity();
>    if(result > 0) {
>	    System.out.println("SUCCESS");
>     } 
>    else {
>		System.out.println("FAILURE");
>	}           
>    System.out.println("done ");
>  }
>@)
>}
>
>
>Container {
>	traversal allWeights(SummingVisitor sV , InitialVisitor iV ,
>CheckingVisitor cV) {
>    to Weight;
>  }
>
>  (@
>
>  int checkCapacity() throws Exception {
>
>    SummingVisitor cV = new CheckingVisitor(0,0,new Stack() , 0);
>    this.allWeights(cV, (InitialVisitor)cV , (CheckingVisitor)cV);
>    return (((CheckingVisitor)cV).get_violations());
>  }
>  @)
>}
>
>
>SummingVisitor{
>	before Simple (@
>		System.out.println(host.get_name());
>	@)
>
>	around Weight (@ 
>		System.out.println("SummingVisitor :: Weight around");
>		total += host.get_i();
>		//subtraversal.apply();
>		
>	@)
>}
>
>InitialVisitor{
>	before Container(@
>		System.out.println("IntialVisitor :: Container before");
>		stack.push(new Integer(total));
>	@)
>
>	around  Container(@
>		subtraversal.apply();
>		System.out.println("InitialVisitor : Container  around");
>		initial = ((Integer)stack.pop()).intValue();
>
>	@)
>}
>
>
>CheckingVisitor{
>	after Container(@
>	//	subtraversal.apply();
>		System.out.println("CheckingVisitor :: Container after");
>		int cap = host.get_capacity().get_i();
>		int diff = total - initial ;
>		if(diff > cap)
>		{
>			violations ++ ;
>			System.out.println(" OVERCAPACITY => Capacity = "+cap+"\tTotal wt =
>"+diff);
>		}
>		else
>			System.out.println(" Capacity = "+cap+"\tTotal wt = "+diff);
>	@)
>}
>
>
>
>-------------------------
>
>
>
>--binoy
>